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PSSnet SHL Redundancy Configuration

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1. PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 71 Rapid Spanning Tree 4 6 The Rapid Spanning Tree Protocol If required change the values for Hello Time Forward Delay and Max Age in the root Switch The root Switch then transfers this data to the other Switches The dialog displays the data received from the root Switch in the left column In the right column you enter the values which shall apply when this Switch becomes a root Switch For the configuration take note of table 12 Operation Con ott Root Information Priority Hello Time s kpo Forward Delay s Eo fhs MexAgeis Eo foo Set Reload OQ Help m Figure 37 Assigning Hello Time Forward Delay und Max Age The times entered in the RSTP dialog are in units of 1 s Example Hello Time 2 corresponds to 2 seconds PSSnet SHL Redundancy Configuration 72 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Rapid Spanning Tree 4 6 The Rapid Spanning Tree Protocol Parameter Meaning Value range Default setting Priority The priority and the MAC address go 0 lt n 4 096 lt 61 440 32 768 together to make up the bridge identification Hello Time The left column shows the value cur 1 2 2 Forward Delay rently being used by the root bridge The device periodically receives con figuration frames Hello frames from
2. o false false true 1 18 d 128 o false false true 1 19 M 128 o false faise true 1 20 v 128 o false false true j a d 128 o taise false true a 22 g 128 o false faise true Figure 39 Configuring the RSTP port Note Deactivate the Spanning Tree Protocol for the ports connected to a redundant ring because the Spanning Tree and the Ring Redundancy work with different reaction times PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 75 Rapid Spanning Tree 4 6 The Rapid Spanning Tree Protocol Parameter Meaning Value range Default setting STP State En able Here you can turn RSTP on or off for this port If you turn RSTP off for this port while RSTP is globally en abled for the device the device will discard RSTP frames received on this port on on off Port State Displays the port state disabled forwarding discarding blocking learning Priority Here you enter the first byte of the port identification 16 lt n 16 lt 240 128 Port Path Cost Enter the path costs to indicate pref erence for redundant paths If the value is 0 the Switch automatical ly calculates the path costs depend ing on the transmission rate 0 200 000 000 0 Admin Edge Port Oper Edge Port If the parameter is set to true the port will transition to the forwardin
3. 19 Content 4 5 4 6 4 7 Example of manipulating the tree structure 65 The Rapid Spanning Tree Protocol 66 4 6 1 Port roles 66 4 6 2 Port states 68 4 6 3 Spanning Tree Priority Vector 69 4 6 4 Fast reconfiguration 69 4 6 5 Configuring the Rapid Spanning Tree 70 Combination of RSTP and MRP 78 4 7 1 Application example for the combination of RSTP and MRP 79 Index 83 Further support 85 PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern About this Manual About this Manual The Redundancy Configuration user manual contains all the information you need to select a suitable redundancy procedure and configure it The Basic Configuration user manual contains all the information you need to start operating the device It takes you step by step from the first startup operation through to the basic settings for operation in your environment The Installation user manual contains a device description safety instruc tions a description of the display and all the other information that you need to install the device before you begin with the configuration of the device The Industry Protocols user manual describes how the device is connected by means of a communication protocol commonly used in the industry such as EtherNet IP and PROFINET The Web based Interface reference manual contains detailed information on using the Web interface to operate the
4. 3 Ring Redundancy 2 1 Example of HIPER Ring Note As an alternative to using software to configure the HIPER Ring with devices PSSnet SHL you can also use a DIP switch to enter a number of set tings You can also use a DIP switch to enter a setting for whether the con figuration via DIP switch or the configuration via software has priority The state on delivery is Software Configuration Note Configure all the devices of the HIPER Ring individually Before you connect the redundant line you must complete the configuration of all the devices of the HIPER Ring You thus avoid loops during the configuration phase PSSnet SHL Redundancy Configuration 14 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Redundancy 2 1 Example of HIPER Ring 2 1 1 Setting up and configuring the HIPER Ring O Set up the network to meet your requirements O You configure all 6 ports so that the transmission speed and the duplex settings of the lines correspond to the following table Bit rate 100 Mbit s 1000 Mbit s Autonegotiation off on automatic configuration Port on on Duplex Full Table 2 Port settings for ring ports Select the Redundancy Ring Redundancy dialog Under Version select HIPER Ring Define the desired ring ports 1 and 2 by making the corresponding entries in the module and port fields If it is not possible to enter a module then there is only one module in the devi
5. 53 Redundant Coupling of network typically 150 ms up to lt 500ms coupling segment rings via a main line and a redundant line Table 1 Comparison of the redundancy procedures PSSnet SHL Redundancy Configuration 1 0 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Redundancy 2 Ring Redundancy The concept of ring redundancy allows the construction of high availability ring shaped network structures With the help of the RM Ring Manager function the two ends of a backbone in a line structure can be closed to a redundant ring The ring manager keeps the redundant line open as long as the line structure is intact If a segment fails the ring manager immediately closes the redundant line and line structure is intact again Figure 1 Line structure Figure 2 Redundant ring structure RM Ring Manager main line redundant line PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 1 1 Ring Redundancy If a section is down the ring structure of a HIPER HIGH PERFORMANCE REDUNDANCY Ring with up to 50 de vices typically transforms back to a line structure within 80 ms setting standard accelerated MRP Media Redundancy Protocol Ring IEC 62439 of up to 50 devices typically transforms back to a line structure within 80 ms adjustable to max 200 ms 500 ms Device requirements for using the HIPER Ring function Wi
6. To do this you connect the two devices to the ends of the line using their ring ports PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 1 7 Ring Redundancy 2 1 Example of HIPER Ring The displays in the Redundancy Manger Status frame mean Active redundant line The ring is open which means that a data line or a network component within the ring is down Inactive The ring is closed which means that the data lines and network components are working The displays in the Information frame mean Redundancy existing One of the lines affected by the function can fail whereby the redundant line will then take over the function of the failed line Configuration failure The function is incorrectly configured or there is an error in the ring port connection Note When you use the DIP switch to switch from a normal port to a ring port the device makes the required settings for the pre defined ring ports in the configuration table The port which has been switched back from a ring port to a normal port keeps the ring port settings transmission speed and mode Independently of the DIP switch setting you can still change all the ports via the software PSSnet SHL Redundancy Configuration 1 8 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Redundancy 2 2 Example of MRP Ring 2 2 Example of MRP Ring A ne
7. device within a Ring Network coupling Depending on the device this switch is a DIP switch or a software switch Redundancy Ring Network Coupling dialog By setting this switch you define whether the device has the main coupling or the redundant cou pling within a Ring Network coupling Device type STAND BY switch type PSSnet SHL Can be switched between DIP switch and software switch Table 5 Overview of the STAND BY switch types Depending on the device and model set the STAND BY switch in accor dance with the following table see table 6 PSSnet SHL Redundancy Configuration 28 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Network coupling 3 2 Preparing a Ring Network cou pling Device with Choice of main coupling or redundant coupling DIP switch On STAND BY DIP switch DIP switch software switch According to the option selected option on STAND BY DIP switch or in the Redundancy Ring Network Coupling dialog by making se lection in Select configuration Note These devices have a DIP switch with which you can choose between the software configuration and the DIP switch configura tion If you have set the software configuration changing the other DIP switches has no effect Software switch In the Redundancy Ring Network Coupling dialog Table 6 Setting the STAND BY switch Select the Redundancy Ring Network Coupling dialog You first select t
8. ring manager Switch s HIPER Ring mode set to ring manager hiper ring port primary 1 1 Define port 1 in module 1 as ring port 1 HIPER Ring primary port set to 1 1 hiper ring port secondary 1 2 Define port 2 in module 1 as ring port 2 HIPER Ring secondary port set to 1 2 exit Switch to the privileged EXEC mode show hiper ring Display the HIPER Ring parameters HIPER Ring Mode of the Switch ring manager configuration determined by sse05 0008008 management HIPER Ring Primary Port of the Switch 1 1 state active HIPER Ring Secondary Port of the Switch 1 2 state active HIPER Ring Redundancy Manager State active HIPER Ring Redundancy State red guaranteed no rm is active HIPER Ring Setup Info Config failure no error HIPER Ring Recovery Delay csscesceseeee eee eee 500ms O Now proceed in the same way for the other two devices Note If you have configured VLANS note the VLAN configuration of the ring ports In the configuration of the HIPER Ring you select for the ring ports VLAN ID 1 and VLAN membership Untagged in the static VLAN table Note Deactivate the Spanning Tree protocol on the ports connected to the HIPER Ring because Spanning Tree and Ring Redundancy affect each oth er If you enable the HIPER Ring function by means of the DIP switch RSTP will be disabled automatically O Now you connect the line to the ring
9. table and VLAN membership U in the static VLAN table Note If you are operating the Ring Manager and two Switch coupling functions at the same time there is the risk of creating a loop Redundancy mode PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 41 Ring Network coupling 3 2 Preparing a Ring Network cou pling LC In the Redundancy Mode frame select see fig 18 Redundant Ring Network Coupling or Extended Redundancy Set Reload Delete coupling configuration Select Configuration eoet eoet pq pc bc pc pqg 7 H T Tt pm bc bc be Bc Lo Lo Lo 10 Lo EI STANDBY CS STAND BY STAND EYE CS STAND BY STAND BY EJ Select Port Module Port Coupingpot f fe Port mode active Port state active Partner coupling port Port mode fstand by Port state fnot connected IP Address 0 0 0 0 Control port F 0 Port state not connected Operation Information Redundancy Mode Coupling Mode On T Redundancy existing Redundant RingMetwork Coupling Ring Coupling off I Configuration feilure Extended Redundancy Network Coupling Figure 18 Selecting the redundancy mode With the Redundant Ring Network Coupling setting either the main line or the redundant line is active neously Both
10. 0 63 51 8260 Helo Timet 2 f Topoogychanges fi Forward Delay s 0 fis Time since last change Pasya 21554 MexAgets E k IT This device is root _sa_ Reload Help Figure 36 Operation on off You now connect the redundant lines Define the desired Switch as the root Switch by assigning it the lowest priority in the bridge information among all the Switches in the network in the Protocol Configuration Information frame Note that only multiples of 4096 can be entered for this value see table 12 In the Root Information frame the dialog shows this device as the root A root switch has no root port and no root costs As required you change the default priority value of 32768 in other Switches in the network in the same way to the value you want multiple of 4096 For each of these Switches check the display in the Root Information frame Root Id Displays the bridge identifier of the root Switch Root Port Displays the port that leads to the root Switch Root Cost Displays the root costs to the root Switch in the Protocol Configuration Information frame Priority Displays the priority in the bridge identifier for this Switch MAC Address Displays the MAC address of this Switch Topology Changes Displays the number of changes since the start of RSTP Time since last change Displays the time that has elapsed since the last network reconfiguration
11. Co KG Felix Wankel Str 2 73760 Ostfildern 53 Rapid Spanning Tree When network segments are connected to a MRP ring and you enable MRP compatibility a peculiarity results If the root bridge is located inside the MRP ring the devices inside the MRP ring are combined into one virtual device for the purpose of calculating the branch length Note The RSTP Standard dictates that all the devices within a network work with the Rapid Spanning Tree Algorithm However if STP and RSTP are used at the same time the advantages of faster reconfiguration with RSTP are lost RSTP devices also work in a limited MSTP environment within the scope of their functionality Note Due to a change in the IEEE 802 1D 2004 standard on which RSTP is based the Standards Commission has reduced the maximum value for the Hello Time from 10 to 2 When earlier firmware versions are upgraded to version 5 x or higher the firmware automatically changes a locally entered Hello Time value greater than 2 to 2 If the device is not the RSTP root Hello Time values greater than 2 can re main valid depending on the firmware version of the root device PSSnet SHL Redundancy Configuration 54 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Rapid Spanning Tree 4 1 The Spanning Tree Protocol 4 1 The Spanning Tree Protocol Because RSTP is a further development of the STP all the following descriptions of the STP also apply to t
12. GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Rapid Spanning Tree 4 5 Example of manipulating the tree structure 4 5 Example of manipulating the tree structure The Management Administrator soon discovers that this configuration with bridge 1 as the root bridge see on page 61 Example of specifying the root paths is unfavorable On the paths from bridge 1 to bridge 2 and bridge 1 to bridge 3 the control packets which the root bridge sends to all other bridges are adding up If the Management Administrator makes bridge 2 the root bridge the burden of the control packets on the subnetworks is distributed much more evenly The result is the configuration shown here see fig 34 The distances between the individual bridges and the root bridge are now shorter Port 3 P BID 28672 P BID 16384 H Bridge 2 P BID 40960 P BID 20480 P BID 24576 P BID 32768 Port 2 a Bridge 7 Bridge 4 l Bridge 3 Bridge 1 Port 1 l l l l P BID 36864 Bridge 6 Bridge 5 P BID Priority of the bridge identifikation BID BID without MAC Address Root path Interrupted path Figure 34 Example of manipulating the tree structure PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 65 Rapid Spanning Tree 4 6 The Rapid Spanning Tree Protocol 4 6 The Rapid Spanning Tree Protocol The RSTP takes over the calculation of the tree struct
13. LAN ID gt 0 if the MRP Ring configuration is to be assigned to this VLAN Enter this VLAN ID in the MRP Ring configuration for all devices in this MRP Ring Note the VLAN configuration of the ring ports For all ring ports in this MRP Ring select this VLAN ID and the VLAN membership Tagged in the static VLAN table Note For all devices in an MRP Ring activate the MRP compatibility in the Rapid Spanning Tree Global dialog if you want to use RSTP in the MRP Ring If this is not possible perhaps because individual devices do not support the MRP compatibility you deactivate the Spanning Tree protocol at the ports connected to the MRP Ring Spanning Tree and Ring Redundancy affect each other Note If you want to configure an MRP Ring using the Command Line Inter face you must define an additional parameter When configured using CLI an MRP Ring is addressed via its MRP domain ID The MRP domain ID is a sequence of 16 number blocks 8 bit values Use the default domain of 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 for the MRP domain ID This default domain is also used internally for a configuration via the Web based interface Configure all the devices within an MRP Ring with the same MRP domain ID PSSnet SHL Redundancy Configuration 22 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Redundancy 2 2 Example of MRP Ring enable Switch to the Privileged EXEC mode configure Switch to
14. RSTP Active topology bridge port operational Portstate port role state DISABLED Disabled FALSE Discarding Excluded disabled DISABLED Enabled FALSE Discarding Excluded disabled BLOCKING Enabled TRUE Discarding Excluded alternate backup LISTENING Enabled TRUE Discarding Included root designated LEARNING Enabled TRUE Learning Included root designated FORWARDING Enabled TRUE Forwarding Included root designated Table 11 Relationship between port state values in STP and RSTP the dot1d MIB shows Disabled the dot1d MIB shows Blocked Meaning of the RSTP port states Disabled port does not belong to the active topology Discarding no address learning in FDB and no data traffic apart from sending and receiving Learning address learning active FDB and no data traffic apart from BPDUs Forwarding address learning active FDB and sending and receiving active from all frames not only BPDUs PSSnet SHL Redundancy Configuration 68 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Rapid Spanning Tree 4 6 The Rapid Spanning Tree Protocol 4 6 3 Spanning Tree Priority Vector To assign roles to the ports the RSTP bridges exchange configuration information with each other This information is known as the Spanning Tree Priority Vector It is part of the RST BPDUs and contains the following information Bridge identifier of the root bridges Root path costs for the sending br
15. Str 2 73760 Ostfildern 59 Rapid Spanning Tree 4 2 Rules for creating the tree structu re If two paths with the same root path costs lead out from a bridge the port identifier is used as the last criterion see fig 30 This decides which port is selected Determine root path Equal Path with lowest path costs path costs root path Equal Path with highest _ priority in priority in bridge bridge identification identification root path Equal Path with highest port priority port priority root path Path with lowest port number root path Root path determined Figure 31 Flow diagram for specifying the root path PSSnet SHL Redundancy Configuration 60 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Rapid Spanning Tree 4 3 Example of specifying the root paths 4 3 Example of specifying the root paths The network plan see fig 32 can be used to create the flow diagram see fig 31 for defining the root path The Administrator defined a different priority in the bridge identifier for each bridge The bridge with the smallest number for the bridge identifier is the root bridge in this case bridge 1 In the example all the sub paths have the same path costs The path between bridge 2 and bridge 3 is interrupted because a connection from bridge 3 to the root bridge via bridge 2 would double the path costs The path from bridge 6 to the root bridge is interest
16. ability necessary to meet the requirements of your network you select 500ms Note Settings in the Ring Recovery frame are only effective for devices that you have configured as ring managers Under Configuration Redundancy Manager activate the advanced mode Activate the ring manager for this device Do not activate the ring manager for any other device in the MRP Ring Leave the VLAN ID as 0 in the VLAN field Switch the operation of the MRP Ring on Click on Set to temporarily save the entry in the configuration PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 21 Ring Redundancy 2 2 Example of MRP Ring The displays in the Information frame mean Redundancy existing One of the lines affected by the function can fail whereby the redundant line will then take over the function of the failed line Configuration failure The function is incorrectly configured or there is an error in the ring port connection The VLAN frame enables you to assign the MRP Ring to a VLAN O If VLANs are configured you make the following selections in the VLAN frame VLAN ID 0 if the MRP Ring configuration is not to be assigned to a VLAN as in this example Note the VLAN configuration of the ring ports Select VLAN ID 1 and VLAN membership Untagged in the static VLAN table for the ring ports a V
17. as a redundant line will then take over the function of the failed line Configuration failure The function is incomplete or incorrectly configured Select Configuration PC pc pq Bc pq pc pq Rape 7 in i T malt Task y ch alz po H H EI STANDBY C2 STAND BY STAND EYE L STAND BY STAND BY J Select Port Module Port Coupingport f e Port mode Eianaty Port state active Partner coupling port Port mode factive Port state not connected FP _ Control port pf Port state fot connected Operation Information Redundancy Mode r Coupling Mode C on I Redundancy existing Redundant Ring Network Coupling Ring Coupling off I Configuration failure Extended Redundancy Network Coupling Set Reload Delete coupling configuration Hep Figure 10 Selecting the port and enabling disabling operation PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 33 Ring Network coupling 3 2 Preparing a Ring Network cou pling 34 Note The following settings are required for the coupling ports you select the Basic Settings Port Configuration dialog Port on Automatic configuration autonegotiation on for twisted pair connections Manual configuration 100 Mbit s FDX for glass fiber connections Note If VLANS are c
18. ase contact your local Pilz distributor or Pilz office You can find the addresses of our distributors on the Internet www pilz com Our support line is also at your disposal Tel 49 711 3409 444 Fax 49 711 3409 144 The current training courses to technology and products can be found under www pilz com PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 85 DAT 1 010 05 In many countries we are represented by our subsidiaries and sales partners Please refer to our homepage for further details or contact our headquarters Pilz GmbH amp Co KG Felix Wankel StraBe 2 73760 Ostfildern Germany Telephone 49 711 3409 0 Telefax 49 711 3409 133 E Mail pilz gmbh pilz de gt www www pilz com gt Technical support 49 711 3409 444 1001653 EN 01 2010 03 Printed in Germany Pilz GmbH amp Co KG 2010
19. ce that is taken over as a default PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 1 5 Ring Redundancy 2 1 Example of HIPER Ring Display in Operation field active This port is switched on and has a link inactive This port is switched off or it has no link Version HIPER Ring MRP Ring Port 1 Ring Port 2 Module h Module H Port y Port 2 Operation Operation Redundancy Manager Status Active redundant line Inactive Redundancy Manager Mode On C Off Ring Recovery Standard Accelerated Information Set Reload Delete ring configuration Hep Figure 4 Ring Redundancy dialog O Activate the ring manager for this device Do not activate the ring manager for any other device in the HIPER Ring O In the Ring Recovery frame select the value Standard default Note Settings in the Ring Recovery frame are only effective for devices that you have configured as ring managers O Click on Set to temporarily save the entry in the configuration PSSnet SHL Redundancy Configuration 16 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Redundancy 2 1 Example of HIPER Ring enable Switch to the Privileged EXEC mode configure Switch to the Configuration mode hiper ring mode ring manager Select the HIPER Ring ring redundancy and de fine the device as
20. ce with the table O Connect the redundant RSTP connection PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 81 Rapid Spanning Tree 4 7 Combination of RSTP and MRP PSSnet SHL Redundancy Configuration 82 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Index A Index A Advanced Mode Age Alternate port B Backup port Bridge Identifier Configuration error Configuring the HIPER Ring D Designated bridge Designated port Diameter Disabled port E Edge port F FAQ Forward Delay Hello Time HIPER Ring HiVision Industry protocols L Loops M Max Age Network load Network Management Software One Switch coupling P Port state PROFINET 18 39 41 47 PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 49 73 R Rapid Spanning Tree Redundancy Redundancy existing Redundancy functions Redundancy Manager Redundant Redundant coupling Ring Ring Manager Ring structure Ring Network Coupling Root port RST BPDU RSTP S Symbol Technical questions Training courses Two Switch coupling Two Switch coupling with control line vV VLAN 66 83 Index 84 PSSnet SHL Redundancy Configuration Release 5 0 04 09 Further support B Further support Technical questions and training courses In the event of technical queries ple
21. come false HDX false e g if a hub is connected A Point to point connection is a direct connection between two RSTP de vices The direct local communica tions between the two switches results in a short reconfiguration time Designated Displays the bridge identification of Bridge identification Root the designated root Switch for this hexadecimal port Designated Display of the costs of the path from Costs Costs this port to the root Switch Designated Port Display of the port identifier of the Port identification port that creates the connection to hexadecimal and the root Switch for this port on the port number designated Switch Table 13 Port related RSTP settings and displays PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 7T Rapid Spanning Tree 4 7 Combination of RSTP and MRP 4 7 Combination of RSTP and MRP In the MRP compatibility mode the device allows you to combine RSTP with MRP With the combination of RSTP and MRP the fast switching times of MRP are maintained The RSTP diameter see fig 38 depends on the Max Age It applies to the devices outside the MRP Ring Note The combination of RSTP and MRP requires the root bridge and the backup root bridge to be within the MRP Ring Figure 40 Combination of RSTP and MRP 1 MRP Ring 2 RSTP Ring RM Ring Manager PSSnet SHL Redundancy Configuration 78 P
22. d the redundancy ring ports on different ports Activate the function in the Operation frame see fig 16 The displays in the Select port frame mean see fig 16 Port mode The port is either active or in stand by mode Port state The port is either connected or not connected IP Address The IP address of the partner if the partner is already operating in the network The displays in the Information frame mean see fig 16 Redundancy existing One of the lines affected can fail as a redundant line will then take over the function of the failed line Configuration failure The function is incomplete or incorrectly configured To avoid continuous loops the Switch sets the port state of the coupling port to off if you switch off operation or change the configuration while the connections are in operation at these ports Note The following settings are required for the coupling ports you select the Basic Settings Port Configuration dialog Port on Automatic configuration autonegotiation on for twisted pair connections Manual configuration 100 Mbit s FDX for glass fiber connections Note If VLANS are configured note the VLAN configuration of the coupling and partner coupling ports In the Network Ring Coupling configuration select for the coupling and partner coupling ports VLAN ID 1 and Ingress Filtering disabled in the port
23. dancy function to it Two Switch coupling Assign the device in the redundant line the DIP switch setting STAND BY or use the software configuration to assign the redundancy func tion to it Note For redundancy security reasons the combination of Rapid Spanning Tree and Ring Network Coupling is not possible PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 30 Ring Network coupling 3 2 Preparing a Ring Network cou pling 3 2 2 One Switch coupling 0 STAND BY 2 pq RM Figure 8 Example of one Switch coupling 1 Backbone 2 Ring 3 Partner coupling port 4 Coupling port 5 Main Line 6 Redundant Line PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 31 Ring Network coupling 3 2 Preparing a Ring Network cou pling The coupling between two networks is effected by the main line thick blue line which is connected to the partner coupling port If the main line fails the redundant line thick blue dotted line which is connected to the coupling port takes over coupling the two networks The coupling is effected by one Switch O Select the Redundancy Ring Network Coupling dialog O Select one Switch coupling see fig 9 O _ STAND BY Figure 9 One Switch coupling 1 Coupling port 2 Partner coupling port The following settings apply to the Sw
24. e Information frame mean see fig 23 Redundancy existing One of the lines affected can fail as a redundant line will then take over the function of the failed line Configuration failure The function is incomplete or incorrectly configured Select Configuration be e dee Lo Lo 10 Go stanpey Csi stano ey STAND BY CH STAND BY be he b fc bc bgg Select Port Module Port Coupling port fe je Portmode factive Port state active Port mode jstand by Port state not connectec IP Address 0 0 0 0 Partner coupling port control port F F Port stete hot connecter Operation p Information Redundancy Mode Coupling Mode C On T Redundancy existing Redundant Ring Network Coupling Ring Coupling ott I Configuration failure Extended Redundancy Network Coupling Set Reload Delete coupling configuration Q Help Figure 16 Selecting the port and enabling disabling operation To avoid continuous loops the Switch sets the port state of the coupling port to off if you switch off operation or change the configuration while the connections are in operation at these ports PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 39 Ring Network coupling 3 2 Preparing a R
25. e 38 Definition of diameter and age The diameter is the number of connections between the two devices furthest away from the root bridge The parameters Forward Delay and Max Age have a relationship to each other Forward Delay gt Max Age 2 1 If you enter values that contradict this relationship the device then replaces these values with a default value or with the last valid values O As required change and verify the settings and displays that relate to each individual port menu bar Rapid Spanning Tree Port PSSnet SHL Redundancy Configuration 74 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Rapid Spanning Tree 4 6 The Rapid Spanning Tree Protocol epopee a pe aaa a Enable EdgePort EdgePort EdgePort PointToPoint Priority MAC Adres 1 0 false false 1 k E o false false tus 80 00 00 1 cd 128 o faise faise true a0 00 00 80 63 74 67 1 4 M disables 128 o false false true 80 00 00 1 5 M 128 ol false false true 1 6 M 128 ol false false true 1 7 M 128 o false false true 1 3 ica 128 o false false true 1 9 v 128 o false false true 1 10 M 128 o false talse true 1 11 d 128 ol false talse true 1 12 M 128 ol false talse true 4 13 M 128 o false false true 1 14 M 128 o false false true i as M 128 o taise false true ie A 128 o false false true 1 17 M 128
26. eed and the duplex settings of the lines correspond to the following table Bit rate 100 Mbit s 1000 Mbit s Autonegotiation off on automatic configuration Port on on Duplex Full Table 3 Port settings for ring ports Select the Redundancy Ring Redundancy dialog Under Version select MRP Define the desired ring ports 1 and 2 by making the corresponding entries in the module and port fields If it is not possible to enter a module then there is only one module in the device that is taken over as a default OOO PSSnet SHL Redundancy Configuration 20 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Redundancy 2 2 Example of MRP Ring Display in Operation field forwarding this port is switched on and has a link blocked this port is blocked and has a link disabled this port is switched off not connected this port has no link p Version 4 C HIPER Ring MRP p Ring Port 1 Ring Port 2 Module 1 Module 1 Port r Port 2 Operation Operation p Configuration Redundancy Manager I Advanced Mode p Redundancy Manager Mode On C oft r Operation Ring Recovery Con C 500ms ott 200ms VLAN VLAN ID p Information L Set Reload Delete ring configuration Hep a Figure 6 Ring Redundancy dialog In the Ring Recovery frame select 200ms Note If selecting 200ms for the ring recovery does not provide the ring st
27. er configuration You have configured the MRP settings for the devices in accordance with the above table r Figure 41 Application example for the combination of RSTP and MRP 80 1 MRP Ring 2 RSTP Ring 3 Redundant RSTP connection RM Ring Manager PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Rapid Spanning Tree 4 7 Combination of RSTP and MRP enable configure interface 1 1 spanning tree port mode exit interface 1 2 spanning tree port mode exit interface 1 3 spanning tree port mode exit the RSTP priority global operation the MRP compatibility mode spanning tree mst priority 0 4096 spanning tree spanning tree stp mrp mode O Activate RSTP at the ports here using S1 as an example Switch to the Privileged EXEC mode Switch to the Configuration mode Switch to the Interface Configuration mode of interface 1 1 Activate RSTP at port Switch to the Configuration mode Switch to the interface configuration mode for port 1 2 Activate RSTP at port Switch to the Configuration mode Switch to the interface configuration mode for port 1 3 Activate RSTP at port Switch to the Configuration mode O Configure globally here using S1 as an example Set the RSTP priority to the value 4096 Activate RSTP operation globally Activate MRP compatibility O Configure all the participating devices in accordan
28. f a bridge and the root bridge Bridge 1 PC 200000 PC 2000000 Pc Path costs Ethernet 100 Mbit s Ethernet 10 Mbit s Bridge 2 Bridge 3 Figure 29 Path costs PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 57 Rapid Spanning Tree 4 1 The Spanning Tree Protocol Data rate Recommended value Recommended range Possible range lt 100 KBit s 200 000 000 20 000 000 200 000 000 1 200 000 000 1 MBit s 20 000 000 2 000 000 200 000 000 1 200 000 000 10 MBit s 2 000 000 200 000 20 000 000 1 200 000 000 100 MBit s 200 000 20 000 2 000 000 1 200 000 000 1 GBit s 20 000 2 000 200 000 1 200 000 000 10 GBit s 2 000 200 20 000 1 200 000 000 100 GBit s 200 20 2 000 1 200 000 000 1 TBit s 20 2 200 1 200 000 000 10 TBit s 2 1 20 1 200 000 000 Table 10 Recommended path costs for RSTP based on the data rate Bridges that conform with IEEE 802 1D 1998 edition and only support 16 bit values for the path costs should use the value 65 535 for path costs when they are used in conjunction with bridges that support 32 bit values for the path costs 4 1 5 Port Identifier The Port Identifier consists of 2 bytes One part the lowest value byte signi fies the fixed relationship with the physical port number This part ensures that no port of a bridge has the same identifier as another port of this bridge The second part i
29. g state If the port nevertheless re ceives a RSTP frame it will transi tion to the blocking state and the bridge will then determine the new port role If the parameter s value is false the port remains in the blocked state until the bridge has determined the port role Only after that will the port transition to its final state Is true if no RSTP frames were received i e a terminal device that sends no RSTP frames is connect ed to this port Is false if RSTP frames were received i no terminal device but a bridge is connected true false false true false Auto Edge Port The setting for Auto Edge Port only takes effect if the parameter Oper Edge Port has been set to false if Auto Edge Port is set to true the port will transition to the forwarding state within 1 5 Hello Time 3 seconds If is is set to false it will take 30 seconds until the edge port forwards data frames true false false Table 13 Port related RSTP settings and displays 76 PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Rapid Spanning Tree 4 6 The Rapid Spanning Tree Protocol Parameter Meaning Value range Default setting Oper Point If this port has a full duplex link to true false auto ToPoint another RSTP device the value for is calculated Oper PointToPoint will become FDX true true else it will be
30. gs are required for the coupling ports you select the Basic Settings Port Configuration dialog Port on Automatic configuration autonegotiation on for twisted pair connections Manual configuration 100 Mbit s FDX for glass fiber connections Note If VLANS are configured note the VLAN configuration of the coupling and partner coupling ports In the Network Ring Coupling configuration select for the coupling and partner coupling ports VLAN ID 1 and Ingress Filtering disabled in the port table and VLAN membership U in the static VLAN table Redundancy mode In the Redundancy Mode frame select see fig 25 Redundant Ring Network Coupling or Extended Redundancy PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 49 Ring Network coupling 3 2 Preparing a Ring Network cou pling p Select Configuration 2C PC bc be be Bq H H H a YS be be eS 4 Ci stano or Stano ovat OS stano sr Lol EI STAND Ev Select Port Module Port Coupling port B fe Portmode dive Portstete active Partner coupling port Port mode stand by Port state hot c IP Address Control port bi Operation Information Redundancy Mode Coupling Mode C On JT Redundancy existing Redundant Ri
31. he RSTP 4 1 1 The tasks of the STP The Spanning Tree Algorithm reduces network topologies that are set up using bridges and that have ring structures with redundant connections toa tree structure In doing this STP divides up the ring structures on the basis of specified rules by deactivating redundant paths If a path is interrupted by mistake the STP reactivates the path just deactivated This enables redun dant connections for increased data safety In forming the tree structure the STP determines what is known as a root bridge This forms the basis of the STP tree structure Features of the STP algorithm automatic reconfiguration of the tree structure in the case of a bridge error or the interruption of a data path the tree structure is stabilized up to the maximum network size up to 39 hops depending on the setting for Max Age stabilization is effected within a brief specified period topology can be specified and reproduced by the administrator transparency for the terminal devices low network load relative to the available transmission capacity due to the tree structure created PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 55 Rapid Spanning Tree 4 1 The Spanning Tree Protocol 4 1 2 Bridge parameters Each bridge is uniquely described using parameters Bridge Identifier Root Path Costs for the bridge ports Port Identifier 4 1 3 Bridge Identifie
32. he configuration you want One Switch coupling 1 two Switch coupling 2 or two Switch coupling with control line 3 see fig 7 PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 29 Ring Network coupling 3 2 Preparing a Ring Network cou pling Select Configuration if es ES i REESI pIa Ieee popao i kh Tei DCI pq Lo Lo me Pi 10 eg as 10 tiston 2 smanom stano h sr e stant Select Port Module Port Coupling port h Sij Port mode stand by Port state factive Partner coupling port Port mode active Port state hot connected I p Operation Information Redundancy Mode Coupling Mode C On J7 Redundancy existing Redundant Ring Network Coupling Ring Coupling off I Configuration failure Extended Redundancy Network Coupling Set Reload Delete coupling configuration Figure 7 Selecting the configuration Depending on the STAND BY DIP switch position the dialog displays those configurations that are not possible in gray If you want to select one of these grayed out configurations you put the STAND BY DIP switch on the Switch into the other position One Switch coupling Assign the device the DIP switch setting STAND BY or use the soft ware configuration to assign the redun
33. he displays in the Select port frame mean see fig 23 Port mode The port is either active or in stand by mode Port state The port is either connected or not connected IP Address The IP address of the partner if the partner is already operating in the network The displays in the Information frame mean see fig 23 46 Redundancy existing One of the lines affected can fail as a redundant line will then take over the function of the failed line Configuration failure The function is incomplete or incorrectly configured PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Network coupling 3 2 Preparing a Ring Network cou pling Select Configuration j T FA Teral pC 2c pC 2c al ord Lori Eo a ae Select Port Module Port Coupling port a a Portmode active Port state active Partner coupling port Port mode stand by Port state not connecter IP Address 0 0 0 0 Control port bp Pott state fot connecte Operation Information Redundancy Mode Coupling Mode On T Redundancy existing Redundant RingiNetwork Coupling Ring Coupling C ott I Configuration failure Extended Redundancy Network Coupling Set Reload Delete coupling configuration Help Figure 23 Selecting the
34. he main line is OK again the main line is opened again and the redundant line is blocked again An error is detected and eliminated within 500 ms typically 150 ms The redundant coupling is effected by the two Switch coupling of one port each on two devices in the first ring network to one port each of two devices in the second ring network segment see fig 14 The device in the redundant line and the device in the main line use control packets to inform each other about their operating states via the Ethernet or the control line Immediately after the main line fails the redundant device opens the redun dant line As soon as the main line is OK again the device in the main line informs the redundant device The main line is opened again and the redun dant line is blocked again An error is detected and eliminated within 500 ms typically 150 ms The type of coupling primarily depends on the topological conditions and the desired level of safety see table 4 PSSnet SHL Redundancy Configuration 26 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Network coupling 3 1 Variants of the ring network cou pling One Switch coupling Two Switch coupling Two Switch coupling with control line The two devices are in impractical topological positions Therefore putting a line between them would involve a lot of work for two Switch coupling Application The two devices are in practica
35. he path between bridge 2 and bridge 3 is interrupted because a connection from bridge 3 to the root bridge via bridge 2 would double the path costs The path from bridge 6 to the root bridge is interesting The path via bridge 5 and bridge 3 creates the same root path costs as the path via bridge 4 and bridge 2 STP selects the path using the bridge that has the lowest MAC address in the bridge identification bridge 4 in the illustration However there are two paths between bridge 6 and bridge 4 The port identifier is decisive here Note Because the Administrator does not change the default values for the priorities of the bridges in the bridge identifier apart from the value for the root bridge the MAC address in the bridge identifier alone determines which bridge becomes the new root bridge if the root bridge goes down PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 63 Rapid Spanning Tree 4 4 Example of manipulating the root paths P BID 16384 Bridge 1 P BID 32768 P BID 32768 P BID 32768 Bridge 7 l l l l l l P BID 32768 P BID 32768 Port 3 Bridge 5 l l P BID Priority of the bridge identifikation BID BID without MAC Address l l Root path p Aa S P BID 32768 Port 2 Interrupted path Bridge 6 Figure 33 Example of manipulating the root path PSSnet SHL Redundancy Configuration 64 Pilz
36. id Spanning Tree Protocol Filter table With STP the age of the entries in the filter table determines the updating RSTP immediately deletes the entries in those ports affected by a reconfiguration Reaction to events Without having to adhere to any time specifications RSTP immediately reacts to events such as connection interruptions connection reinstatements etc Note The price to be paid for this fast reconfiguration is the risk that data packets may be duplicated or mixed up during the reconfiguration phase If this is unacceptable for your application switch to the slower Spanning Tree Protocol or select one of the other faster redundancy procedures described in this manual 4 6 5 Configuring the Rapid Spanning Tree O Set up the network to meet your requirements Note Before you connect the redundant lines you must complete the configuration of the RSTP You thus avoid loops during the configuration phase i O Select the Redundancy Rapid Spanning Tree Global dialog PSSnet SHL Redundancy Configuration 70 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Rapid Spanning Tree 4 6 The Rapid Spanning Tree Protocol Switch on RSTP on every device Operation on off Root Information Priority MAC Address Root ld posso 4 00 80 63 Of 1d b0 Root Port fe Root Cost 220000 2 2 Protocol Configuration Information Priority faze mac Address foo 8
37. idges Bridge identifier for the sending bridges Port identifiers of the ports through which the message was sent Port identifiers of the ports through which the message was received Based on this information the bridges participating in RSTP are able to calculate port roles themselves and define the port states of their own ports 4 6 4 Fast reconfiguration Why can RSTP react faster than STP to an interruption of the root path Introduction of edge ports During a reconfiguration RSTP switches an edge port into the trans mission mode after three seconds and then waits for the Hello Time see table 12 to elapse to be sure that no bridge sending BPDUs is connected When the user is sure that a terminal device is connected at this port and will remain connected he can switch off RSTP at this port Thus no waiting times occur at this port in the case of a reconfiguration Introduction of alternate ports As the port roles are already distributed in normal operation a bridge can immediately switch from the root port to the alternate port after the connection to the root bridge is lost Communication with neighboring bridges point to point connections Decentralized direct communication between neighboring bridges enables immediate reaction to status changes in the spanning tree architecture PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 69 Rapid Spanning Tree 4 6 The Rap
38. ilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Rapid Spanning Tree 4 7 Combination of RSTP and MRP To combine RSTP with MRP you perform the following steps in sequence Configure MRP on all devices in the MRP Ring Activate RSTP at the RSTP ports and also at the MRP Ring ports Configure the RSTP root bridge and the RSTP backup root bridge in the MRP Ring Set the priority If you exceed the RSTP diameter specified by the preset value of Max Age 20 you modify Max Age and Forward Delay Activate RSTP globally Activate the MRP compatibility mode After configuring all the participating devices connect the redundant RSTP connection 4 7 1 Application example for the combination of RSTP and MRP The figure see fig 41 shows an example for the combination of RSTP and MRP Parameter S1 S2 S3 S4 MRP settings Ring redundancy MRP version MRP MRP Ring port 1 1 1 1 2 Ring port 2 1 1 1 2 Redundancy Manager mode On Off MRP operation On On Off Off RSTP settings For each RSTP port STP State Enable On On On On Protocol Configuration Priority 4096 0 32768 32768 S2 lt S1 lt S3 and S2 lt S1 lt S4 RSTP Global Operation On On On On RSTP Global MRP compatibility On On PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 79 Rapid Spanning Tree 4 7 Combination of RSTP and MRP Prerequisities for furth
39. individual functions of the device The Command Line Interface reference manual contains detailed informa tion on using the Command Line Interface to operate the individual functions of the device The Network Management Software HiVision Industrial HiVision provides you with additional options for smooth configuration and monitoring Configuration of multiple devices simultaneously Graphical interface with network layouts Auto topology discovery Event log Event handling Client Server structure Browser interface ActiveX control for SCADA integration PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 5 About this Manual SNMP OPC gateway PSSnet SHL Redundancy Configuration 6 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Key Key The designations used in this manual have the following meanings List Work step Subheading Link Indicates a cross reference with a stored link Note A note emphasizes an important fact or draws your attention to a dependency Courier ASCII representation in user interface Oo Execution in the Web based Interface user interface Execution in the Command Line Interface user interface Symbols used Router with firewall Switch with firewall E a Router Switch Bridge EA PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wan
40. ing The path via bridge 5 and bridge 3 creates the same root path costs as the path via bridge 4 and bridge 2 The path via bridge 4 is selected because value 28 672 for the priority in the bridge identifier is smaller than value 32 768 However there are two paths between bridge 6 and bridge 4 The port identifier is decisive here PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 61 Rapid Spanning Tree 4 3 Example of specifying the root paths P BID 16384 Bridge 1 P BID 20480 P BID 24576 P BID 40960 Bridge 7 l l l l l l P BID 28672 P BID 32768 Port 3 Bridge 5 l l P BID Priority of the bridge identifikation BID BID without MAC Address l l Root path p Ae S P BID 36 864 Port 2 Interrupted path Bridge 6 Figure 32 Example of specifying the root path PSSnet SHL Redundancy Configuration 62 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Rapid Spanning Tree 4 4 Example of manipulating the root paths 4 4 Example of manipulating the root paths The network plan see fig 32 can be used to create the flow diagram see fig 31 for defining the root path The Administrator left the default value of 32 768 for each bridge apart from bridge 1 and gave bridge 1 the value 16 384 thus making it the root bridge In the example all the sub paths have the same path costs T
41. ing Network cou pling Note The following settings are required for the coupling ports you select the Basic Settings Port Configuration dialog Port on Automatic configuration autonegotiation on for twisted pair connections Manual configuration 100 Mbit s FDX for glass fiber connections Note If VLANS are configured note the VLAN configuration of the coupling and partner coupling ports In the Network Ring Coupling configuration select for the coupling and partner coupling ports VLAN ID 1 and Ingress Filtering disabled in the port table and VLAN membership U in the static VLAN table Note If you are operating the Ring Manager and two Switch coupling func tions at the same time there is the risk of creating a loop O Select two Switch redundant coupling see fig 18 STAND BY Figure 17 Two Switch coupling 1 Coupling port 2 Partner coupling port The following settings apply to the Switch displayed in blue in the selected graphic O Select the coupling port see fig 16 see table 7 With Coupling port you specify at which port you are connecting the network segments O If the STANDBY DIP switch is ON connect the main line to the coupling port PSSnet SHL Redundancy Configuration 40 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Network coupling 3 2 Preparing a Ring Network cou pling Note Configure the coupling port an
42. itch displayed in blue in the selected graphic O Select the partner coupling port see fig 10 see table 7 With Partner coupling port you specify at which port you are connecting the control line The following tables show the selection options and default settings for the ports used in the Ring Network coupling Device Partner coupling port Coupling port PSSnet SHL All ports default setting port 1 3 All ports default setting port 1 4 Table 7 Port assignment for one Switch coupling PSSnet SHL Redundancy Configuration 32 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Network coupling 3 2 Preparing a Ring Network cou pling Note Configure the partner coupling port and the HIPER Ring ports on different ports Select the coupling port see fig 10 see table 7 With Coupling port you specify at which port you are connecting the redundant line Note Configure the coupling port and the redundancy ring ports on different ports Activate the function in the Operation frame see fig 16 You now connect the redundant line The displays in the Select port frame mean see fig 10 Port mode The port is either active or in stand by mode Port state The port is either connected or not connected The displays in the Information frame mean see fig 10 Redundancy existing One of the lines affected can fail
43. kel Str 2 73760 Ostfildern Hub A random computer Configuration Computer Server Pi o PLC Programmable logic controller I O Robot PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Introduction 1 Introduction The device contains a range of redundancy functions HIPER Ring MRP Ring Ring Network Coupling Rapid Spanning Tree Algorithm RSTP PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Introduction 1 1 Overview of Redundancy Procedure 1 1 Overview of Redundancy Procedure Redundancy Network topology Switching time procedure RSTP Random structure typically lt 1 s STP lt 30 s up to lt 30 s depends heavily on the number of devices Note Up to 79 devices possible depending on topology and configuration If the default values are being used up to 39 devices are possible depending on the topology see page 53 HIPER Ring Ring typically 80 ms up to lt 500 ms practically indepen dently of the number of devices MRP Ring Ring typically 80 ms up to lt 500 ms practically indepen dently of the number of devices Note In combination with RSTP in MRP compatibility mode up to 39 devices are possible depending on the configuration If the default values for RSTP are being used up to 19 devices are possible see page
44. l topological positions Putting down a control line would involve a lot of work The two devices are in practical topological positions Putting down a control line would not involve much work Disadvantage If the Switch config ured for the redundant coupling fails no con nection remains between the networks Less work involved in connecting the two devices to the network compared with two Switch coupling Advantage Much work involved in connecting the two devices to the network compared with one Switch coupling If one of the devices configured for the re dundant coupling fails there is still a connec tion between the net works Much work involved in connecting the two devices to the network compared with one Switch and two Switch coupling If one of the devices configured for the re dundant coupling fails there is still a connec tion between the net works Table 4 Selection criteria for the variants of the redundant coupling Note The choice of configuration primarily depends on the topological conditions and the desired level of security see table 4 PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 27 Ring Network coupling 3 2 Preparing a Ring Network cou pling 3 2 Preparing a Ring Network coupling 3 2 1 STAND BY switch The devices have a STAND BY switch with which you can define the role of the
45. lines are never active simulta With the Extended Redundancy setting the main line and the redun dant line are simultaneously active if the connection line between the devices in the connected network fails see fig 12 During the reconfiguration period there may be package duplications Therefore only select this setting if your application detects package duplications Figure 19 Extended redundancy 42 PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Network coupling 3 2 Preparing a Ring Network cou pling Coupling mode The coupling mode indicates the type of the connected network In the Coupling Mode frame select see fig 20 Ring Coupling or Network Coupling Select Configuration PtP PoP PoP PoP PCP 7 ji a T a i T pg pg a a re EI STANDBY CS STAND 6Y STAND BY C STAND BY STAND By I p Select Port Module Port Coupling port a h Port mode active Port state Partner coupling port Port mode siana by Port state p PAddress pooo tral port E Ea Port state hot connecte Operation Information Redundancy Mode Coupling Mode On I Redundancy existing Redundant RingNetwork Coupling Ring Coupling oft F Configuration faiture Extended Redundancy Network Coup
46. ling Set Reload Delete coupling configuration Help Figure 20 Selecting the coupling mode Select Ring coupling if you are connecting a redundancy ring Select Network Coupling if you are connecting a line structure Delete coupling configuration The Delete coupling configuration button in the dialog allows you to reset all the coupling settings of the device to the state on delivery PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 43 Ring Network coupling 3 2 Preparing a Ring Network cou pling 3 2 4 Two Switch coupling with control line STAND BY STAND BY Figure 21 Example of Two Switch coupling with control line 1 Backbone 2 Ring 3 Main line 4 Redundant line 5 Control line PSSnet SHL Redundancy Configuration 44 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Network coupling 3 2 Preparing a Ring Network cou pling The coupling between two networks is effected by the main line thick blue line If the main line fails the redundant line thick blue dotted line takes over coupling the two networks The coupling is effected by two Switches The Switches send their control packets via a control line The device to which you connect the main line and the device to which you connect the redundant line are partners as regards the coupling O Connect
47. n 66 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Rapid Spanning Tree 4 6 The Rapid Spanning Tree Protocol Alternate port This is a blocked port that takes over the task of the bridge port if the connection to the root bridge fails The alternate port guarantees the connection of the bridge to the root bridge Backup port This is a blocked port that serves as a backup in case the connection to the designated port of this network segment without RSTP bridge fails Disabled port This is the port that does not play any role with the Spanning Tree Operation and is therefore switched off or does not have any connection P BID 16384 Bridge 1 P BID 20480 P BID 24576 Bridge 2 Bridge 3 P BID 40960 T FT Bridge 7 P BID 28672 P BID 32768 l C C P BID Priority of the bridge identifikation BID l i Port 2 BID without MAC Address Root path Bridge 4 no Interrupted path Bridge 5 Root port Designated port Il Alternate port lll Backup port lt gt Edge port Figure 35 Port role assignment PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 67 Rapid Spanning Tree 4 6 The Rapid Spanning Tree Protocol 4 6 2 Port states Depending on the tree structure and the state of the selected connection paths the RSTP assigns the ports their states STP port state Administrative MAC
48. ngiNetwork Coupling Ring Coupling C ott I Configuration teilure Extended Redundancy C Network Coupling Set Reload Delete coupling configuration Help Figure 25 Selecting the redundancy mode With the Redundant Ring Network Coupling setting either the main line or the redundant line is active Both lines are never active simulta neously With the Extended Redundancy setting the main line and the redun dant line are simultaneously active if the connection line between the devices in the connected network fails see fig 12 During the reconfiguration period there may be package duplications Therefore only select this setting if your application detects package duplications Figure 26 Extended redundancy Coupling mode The coupling mode indicates the type of the connected network O In the Coupling Mode frame select see fig 27 Ring Coupling or Network Coupling PSSnet SHL Redundancy Configuration 50 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Network coupling 3 2 Preparing a Ring Network cou pling Select Configuration Pq 2 FF REPE RAS ag AS PAS mg AS i eae en e pC 4 pe 2c tistanoey be stano sv Stanovi E stano ev Stanov E Select Port Module Port Coupling port E Portmode cive Port sta
49. onfigured note the VLAN configuration of the coupling and partner coupling ports In the Network Ring Coupling configuration select for the coupling and partner coupling ports VLAN ID 1 and Ingress Filtering disabled in the port table and VLAN membership U in the static VLAN table Redundancy mode LC In the Redundancy Mode frame select see fig 11 Redundant Ring Network Coupling or Extended Redundancy Select Configuration DAS a AS pc Pe pc eq Pcp A T T ai Tar PCJ PC F z oT STAND BY STAND BY S C STAND BY STAND BY J p Select Port Module Port Coupling port h f Port mode stand by Port state active Partner coupling port Port mode active Port state fiot connected ad og Control port bP Port state pot connected Operation Information Redundancy Mode Coupling Mode C on I Redundancy existing C Redundant Ring Network Coupling Ring Coupling off I Configuration failure Extended Redundancy Network Coupling Set Reload Delete coupling configuration Help Figure 11 Selecting the redundancy mode With the Redundant Ring Network Coupling setting either the main line or the redundant line is active Both lines are never active simulta neously PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfilde
50. oupling if you are connecting a redundancy ring Select Network Coupling if you are connecting a line structure PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 35 Ring Network coupling 3 2 Preparing a Ring Network cou pling Delete coupling configuration O The Delete coupling configuration button in the dialog allows you to reset all the coupling settings of the device to the state on delivery PSSnet SHL Redundancy Configuration 36 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Network coupling 3 2 Preparing a Ring Network cou pling 3 2 3 Two Switch coupling l l l i 14 l l l l 2L fe STAND BY STAND BY Figure 14 Example of two Switch coupling 1 Backbone 2 Ring 3 Main line 4 Redundant line PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 37 Ring Network coupling 3 2 Preparing a Ring Network cou pling The coupling between two networks is effected by the main line thick blue line If the main line fails the redundant line thick blue dotted line takes over coupling the two networks The coupling is effected by two Switches The switches send their control packages via the Ethernet The Switch to which you connect the main line and the Switch to which you connect the redundant line are partners a
51. pilz more than automation safe automation Industrial Ethernet Switches PSSnet S All rights to this documentation are reserved by Pilz GmbH amp Co KG Copies may be made for internal purposes Suggestions and comments for improving this documentation will be gratefully received Pilz PIT PMI PNOZ Primo PSEN PSS PVIS SafetyBUS p SafetyEYE SafetyNET p the spirit of safety are registered and protected trademarks of Pilz GmbH amp Co KG in some countries Content Content 2 2 3 1 3 2 4 2 4 3 44 Content About this Manual Key Introduction Overview of Redundancy Procedure Ring Redundancy Example of HIPER Ring 2 1 1 Setting up and configuring the HIPER Ring Example of MRP Ring Ring Network coupling Variants of the ring network coupling Preparing a Ring Network coupling 3 2 1 STAND BY switch 3 2 2 One Switch coupling 3 2 3 Two Switch coupling 3 2 4 Two Switch coupling with control line Rapid Spanning Tree The Spanning Tree Protocol 4 1 1 The tasks of the STP 4 1 2 Bridge parameters 4 1 3 Bridge Identifier 4 1 4 Root Path Costs 4 1 5 Port Identifier Rules for creating the tree structure 4 2 1 Bridge information 4 2 2 Setting up the tree structure Example of specifying the root paths Example of manipulating the root paths PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 11 13 15
52. port and enabling disabling operation To avoid continuous loops the Switch sets the port state of the coupling port to off if you switch off operation or change the configuration while the connections are in operation at these ports Note The following settings are required for the coupling ports you select the Basic Settings Port Configuration dialog Port on Automatic configuration autonegotiation on for twisted pair connections Manual configuration 100 Mbit s FDX for glass fiber connections Note If VLANS are configured note the VLAN configuration of the coupling and partner coupling ports In the Network Ring Coupling configuration select for the coupling and partner coupling ports VLAN ID 1 and Ingress Filtering disabled in the port table and VLAN membership U in the static VLAN table PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 47 Ring Network coupling 3 2 Preparing a Ring Network cou pling O Select two Switch redundant coupling with control line see fig 24 STAND BY Figure 24 Two Switch coupling with control line 1 Coupling port 2 Partner coupling port 3 Control line The following settings apply to the Switch displayed in blue in the selected graphic O Select the coupling port see fig 23 see table 9 With Coupling port you specify at which port you are connecting the ne
53. r The Bridge Identifier consists of 8 bytes The two highest value bytes are the priority The default setting for the priority number is 32 768 but the Management Administrator can change this when configuring the network The six lowest value bytes of the bridge identifier are the MAC address of the bridge The MAC address guarantees that every bridge has a different bridge identifier The bridge with the smallest number for the bridge identifier has the highest priority MSB LSB po a_i a a uc SSS S Priority MAC Address Figure 28 Bridge Identifier PSSnet SHL Redundancy Configuration 56 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Rapid Spanning Tree 4 1 The Spanning Tree Protocol 4 1 4 Root Path Costs Every path that connects two bridges is assigned costs for the transmission path costs The Switch specifies this value based on the transmission speed see table 10 It assigns the higher path costs to paths with lower transmission speeds Alternatively the Administrator can specify the path costs Like the Switch the Administrator assigns the higher path costs to paths with lower transmis sion speeds However since the Administrator can choose this value freely he has a tool with which he can give a certain path an advantage among redundant paths The root path costs are the sum of all the individual path costs for all paths along which a data packet travels between the connected port o
54. rn Ring Network coupling 3 2 Preparing a Ring Network cou pling With the Extended Redundancy setting the main line and the redun dant line are simultaneously active if the connection line between the devices in the connected network fails see fig 12 During the reconfiguration period there may be package duplications Therefore only select this setting if your application detects package duplications Figure 12 Extended redundancy Coupling mode The coupling mode indicates the type of the connected network In the Coupling Mode frame select see fig 13 Ring Coupling or Network Coupling Select Configuration Pq 2 2 tS PAS aag SAS 7 i T Sin ogee jee Gistanosy Eh stano sv Stano evid EE stano sv Select Port Ht s KHA EF Module Port Coupling port fr fa Portmode stand by Port state active Partner coupling port Port mode active Port state not connected I m ortrol port ek Port state hot connecte Operation information Redundancy Mode p Coupling Mode C on I Redundancy existing C Redundant RingiNetwork Coupling Ring Coupling oft IT Configuration faiture Extended Redundancy C Network Coupling Set Reload Delete coupling configuration Help Figure 13 Selecting the coupling mode Select Ring c
55. s regards the coupling O Connect the two partners via their ring ports O Select the Redundancy Ring Network Coupling dialog O Select two Switch main coupling see fig 15 STAND BY Figure 15 Two Switch coupling 1 Coupling port 2 Partner coupling port The following settings apply to the Switch displayed in blue in the selected graphic O Select the coupling port see fig 10 see table 7 With Coupling port you specify at which port you are connecting the redundant line O If the STANDBY DIP switch is OFF connect the main line to the coupling port Device Coupling port PSSnet SHL Adjustable for all ports default setting port 1 4 Table 8 Port assignment for the redundant coupling two Switch coupling PSSnet SHL Redundancy Configuration 38 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Network coupling 3 2 Preparing a Ring Network cou pling Note Configure the coupling port and the redundancy ring ports on different ports Activate the function in the Operation frame see fig 16 You now connect the redundant line The displays in the Select port frame mean see fig 16 Port mode The port is either active or in stand by mode Port state The port is either connected or not connected IP Address The IP address of the partner if the partner is already operating in the network The displays in th
56. s the port priority which is specified by the Administrator default value 128 It also applies here that the port with the smallest number for the port identifier has the highest priority MSB LSB O e aut aut Priority Port number Figure 30 Port Identifier PSSnet SHL Redundancy Configuration 58 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Rapid Spanning Tree 4 2 Rules for creating the tree structu re 4 2 Rules for creating the tree structure 4 2 1 Bridge information To calculate the tree structure the bridges require more detailed information about the other bridges located in the network To obtain this information each bridge sends a BPDU Bridge Protocol Data Unit to the other bridges The contents of a BPDU include bridge identifier root path costs and port identifier see IEEE 802 1D 4 2 2 Setting up the tree structure The bridge with the smallest number for the bridge identifier is the root bridge It is the root of the tree structure The structure of the tree depends on the root path costs STP selects the structure so that the path costs between each individual bridge and the root bridge are kept to a minimum In the case of anumber of paths with the same root path costs the priority of the bridge identifier for the bridge connected to one of these paths decides which bridge should block PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel
57. t empty gt Recovery Celay cceseeuv ek ee ek ee ee eevee es 200ms Port Number Prima ry ssisaaaaeaaaaweaas 1 1 State Not Connected Port Number Secondary scsceceesaecas 1 2 State Not Connected WIGAN UD OERE REEERE CECE EEEE EE EEE EE IERE E 0 No VLAN OperatiOnssrs rara ee eis E A S Enabled PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 23 Ring Redundancy 2 2 Example of MRP Ring O Now you connect the line to the ring To do this you connect the two devices to the ends of the line using their ring ports PSSnet SHL Redundancy Configuration 24 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Network coupling 3 Ring Network coupling This device allows the redundant coupling of redundant rings and network segments Two rings network segments are connected via two separate paths The ring network coupling supports the following devices PSSnet SHL PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 25 Ring Network coupling 3 1 Variants of the ring network cou pling 3 1 Variants of the ring network coupling The redundant coupling is effected by the one Switch coupling of two ports of one device in the first ring network to one port each of two devices in a second ring network segment see fig 8 Immediately after the main line fails the device opens the redundant line When t
58. te active Partner coupling port Port mode stand by Port state iot connecter PAddress pooo Control port be Operation Information Redundancy Mode Coupling Mode j on T Redundancy existing Redundant Ring Network Coupling Ring Coupling C ott IT Contiguration failure Extended Redundancy C Network Coupling Set Reload Delete coupling configuration Figure 27 Selecting the coupling mode Select Network Coupling Delete coupling configuration Select Ring coupling if you are connecting a redundancy ring if you are connecting a line structure The Delete coupling configuration button in the dialog allows you to reset all the coupling settings of the device to the state on delivery PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 51 Ring Network coupling 3 2 Preparing a Ring Network cou pling PSSnet SHL Redundancy Configuration 52 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Rapid Spanning Tree 4 Rapid Spanning Tree Note The Spanning Tree and Rapid Spanning Tree protocols based on IEEE 802 1D 2004 and IEEE 802 1w respectively are protocols for MAC bridges For this reason the following description of these protocols usually employs the term bridge instead of switch Local networks are getting bigger and bigger This applies to both the geographical expansion and the number of ne
59. the Configuration mode mrp new domain default domain Create a new MRP Ring with the default domain ID 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 MRP domain created Domain ID 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 Default MRP domain mrp current domain Define port 1 in module 1 as ring port 1 primary port primary 1 1 Primary Port set to 1 1 mrp current domain Define port 2 in module 1 as ring port 2 second port secondary 1 2 ary Secondary Port set to 1 2 mrp current domain mode Define this device as the ring manager manager Mode of Switch set to Manager mrp current domain recovery Define 200ms as the value for the Ring Recov delay 200ms ery Recovery delay set to 200ms mrp current domain advanced Activate the MRP Advanced Mode mode enable Advanced Mode react on link change set to Enabled mrp current domain operation enable Activate the MRP Ring Operation set to Enabled exit Go back one level show mrp Show the current parameters of the MRP Ring abbreviated display Domain ID 259 2902902299290 299 2554250 s 29942995 290 200 259 259 255 255 Default MRP domain Configuration Settings Advanced Mode react on link change Enabled M nager PrLOrieys ceceseeedas ee aas iaaa 32768 Mode of Switch administrative setting Manager Mode of Switch real operating state Manager DOWeIn Nae 66 5 eee ode eee so ee a ee l
60. the root bridge The Hello Time shows the time between two succes sive configuration frames sent by the root bridge If you configure the cur rent device as the root bridge the other devices in the entire network will assume the value in the right col umn The left column shows the value cur 4 30 see a 30 rently being used by the root bridge The predecessor protocol STP used the parameter to control delay the transition time between the states disabled blocking learning forwarding Since the introduction of RSTP this parameter has only secondary relevance because state transitions are negotiated between RSTP bridges without a given time delay If you configure the current de vice as the root bridge the other de vices in the entire network will assume the value in the right column Max Age The left column shows the value cur 6 40 see a 6 rently being used by the root Switch Contrary to the past STP meaning Max Age now for RSTP denotes the maximum permissible branch length number of devices to the root bridge If you configure the current device as the root bridge the other devices in the entire network will as sume the value in the right column Table 12 Global RSTP settings PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 73 Rapid Spanning Tree 4 6 The Rapid Spanning Tree Protocol Figur
61. the two partners via their ring ports Select the Redundancy Ring Network Coupling dialog Select two Switch main coupling with control line see fig 22 STAND BY Figure 22 Two Switch coupling with control line 1 Coupling port 2 Partner coupling port 3 Control line The following settings apply to the Switch displayed in blue in the selected graphic Select the coupling port see fig 23 see table 9 With Coupling port you specify at which port you are connecting the redundant line 5 If the STANDBY DIP switch is OFF connect the main line to the coupling port l Select the control port see fig 23 see table 9 With Control port you specify at which port you are connecting the control line PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 45 Ring Network coupling 3 2 Preparing a Ring Network cou pling Device Coupling port Control port PSSnet SHL Adjustable for all ports Adjustable for all ports default setting port 1 4 default setting port 1 3 Table 9 Port assignment for the redundant coupling two Switch coupling with con trol line Note Configure the coupling port and the redundancy ring ports on different ports O O Activate the function in the Operation frame see fig 16 You now connect the redundant line and the control line T
62. thin a HIPER Ring you can use any combination of the following devices PSSnet SHL Within an MRP Ring you can use devices that support the MRP protocol based on IEC62439 Note Enabled Ring Redundancy methods on a device are mutually exclu sive at any one time When changing to another Ring Redundancy method deactivate the function for the time being Note The following usage of the term ring manager instead of redundancy manager makes the function easier to understand 12 PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Redundancy 2 1 Example of HIPER Ring 2 1 Example of HIPER Ring Anetwork contains a backbone in a line structure with 3 devices To increase the redundancy reliability of the backbone you have decided to convert the line structure to a HIPER Ring You use ports 1 and 2 in module 1 of the devices to connect the lines i l z D Qe Figure 3 Example of HIPER Ring RM Ring Manager main line redundant line The following example configuration describes the configuration of the ring manager device 1 The two other devices 2 to 3 are configured in the same way but without activating the ring manager function Select the Standard value for the ring recovery or leave the field empty PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 1
63. twork contains a backbone in a line structure with 3 devices To increase the redundancy reliability of the backbone you have decided to convert the line structure to a ring redundancy In contrast to the previous example devices from different manufacturers are being used which do not all support the HIPER Ring protocol All the devices have MRP as the ring redundancy protocol so you decide to use MRP You use ports 1 and 2 in module 1 of the devices to connect the lines i l z D 7 Figure 5 Example of MRP Ring RM Ring Manager main line redundant line The following example configuration describes the configuration of the ring manager device 1 You configure the two other devices 2 to 3 in the same way but without activating the ring manager function This example does not use a VLAN You have entered 200 ms as the ring recovery time and all the devices support the advanced mode of the ring manager PSSnet SHL Redundancy Configuration Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern 1 9 Ring Redundancy 2 2 Example of MRP Ring Note Configure all the devices of the MRP Ring individually Before you connect the redundant line you must complete the configuration of all the de vices of the MRP Ring You thus avoid loops during the configuration phase O Set up the network to meet your requirements O You configure all 6 ports so that the transmission sp
64. twork participants Therefore it usually makes sense to use multiple bridges for example to reduce the network load in sub areas to set up redundant connections and to overcome distance limitations However using multiple bridges with multiple redundant connections between the subnetworks can lead to loops and thus the total failure of the network To prevent this the Rapid Spanning Tree Algorithm was devel oped The Rapid Spanning Tree Protocol RSTP enables redundancy by interrupting loops RSTP is a further development of the Spanning Tree Protocol STP and is compatible with it If a connection or a bridge fails the STP requires a maxi mum of 30 seconds to reconfigure This was no longer acceptable in time sensitive applications The STP was therefore developed to the RSTP lead ing to average reconfiguration times of less than a second If you use RSTP ina ring topology with 10 20 devices you can achieve reconfiguration times in the range of milliseconds Note RSTP resolves a given topology to a tree structure Spanning Tree The number of devices in a branch from the root to the branch tip is limited by the parameter Max Age The default value for Max Age is 20 it can be increased to 40 You should note the following here If the root device fails and another device takes over the root function the largest possible number of devices decreas es accordingly PSSnet SHL Redundancy Configuration Pilz GmbH amp
65. twork segments If the STANDBY DIP switch is ON connect the main line to the coupling port Select the control port see fig 23 see table 9 With Control port you specify at which port you are connecting the control line q O Note Configure the coupling port and the redundancy ring ports on different ports O Activate the function in the Operation frame see fig 16 O You now connect the redundant line and the control line The displays in the Select port frame mean see fig 23 Port mode The port is either active or in stand by mode Port state The port is either connected or not connected IP Address The IP address of the partner if the partner is already operating in the network PSSnet SHL Redundancy Configuration 48 Pilz GmbH amp Co KG Felix Wankel Str 2 73760 Ostfildern Ring Network coupling 3 2 Preparing a Ring Network cou pling The displays in the Information frame mean see fig 23 Redundancy existing One of the lines affected can fail as a redundant line will then take over the function of the failed line Configuration failure The function is incomplete or incorrectly configured To avoid continuous loops the Switch sets the port state of the coupling port to off if you switch off operation or change the configuration while the connections are in operation at these ports Note The following settin
66. ure by the STP un changed RSTP merely changes parameters and adds new parameters and mechanism that speed up the reconfiguration in the case of a failure The ports play a significant role in this context 4 6 1 Port roles RSTP assigns each bridge port one of the following roles see fig 35 Root port This is the port at which a bridge receives data packets with the lowest path costs from the root bridge If there are multiple ports with the same low path costs the bridge identifier determines which port is the root port If there are multiple ports with the same low path costs and the same bridge identifier the port identifier determines which port is the root port see fig 31 The root bridge does not have a root port Designated port The bridge in a network segment that has the lowest root path costs is the designated bridge If multiple bridges have the same root path costs then the bridge with the smallest value for the bridge identifier becomes the designated bridge The port on this bridge that connects it to a network segment that leads from the root bridge is the designated port Edge port Every network segment in which there are no additional RSTP bridges is connected with exactly one designated port This designated port is then also an edge port The distinction of an edge port is the fact that it does not receive any RST BPDUs Rapid Spanning Tree Bridge Protocol Data Unit PSSnet SHL Redundancy Configuratio

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