Management Software User's Guide
Contents
1. If a port is assigned to be a new member of a VLAN its membership can be defined as either tagged or untagged 40 Incoming and Outgoing Tagged and Untagged Frames AT S82 Management Software User s Guide Tagged Port Members A port is a tagged member of a specific VLAN when it is a member of more than one VLAN If a port is a tagged member of one VLAN then the same port is also an untagged member of another VLAN Untagged Port Members A port is an untagged member of a VLAN if the PVID is equal to the VID of that VLAN A port can be an untagged member of only one VLAN An example of this is the Default VLAN configuration where all ports are initially configured to be untagged members of VLAN 1 only A port can also be an untagged member of one VLAN and be a tagged member of one or more VLANS The VLAN information within an Ethernet frame is referred to as a tag or tagged header The frame containing this VLAN tag information is referred to as a tagged frame Likewise a frame that does not contain this VLAN tag information is referred to as an untagged or standard frame A tag which follows the source and destination addresses in the frame s header contains the VID information of the VLAN to which the frame belongs according to the IEEE802 3ac VLAN tagging standard When a switch receives a frame it examines the frame header to see if it contains a VLAN tag tagged frame or no tag untagged frame After switching the2. Management Software AT S82 User s Guide For the AT GS950 8 Layer 2 Gigabit Ethernet WebSmart Switch Version 1 0 0 613 000375 Rev A F Allied Telesis Copyright 2006 Allied Telesis Inc All rights reserved No part of this publication may be reproduced without prior written permission from Allied Telesis Inc Microsoft and Internet Explorer are registered trademarks of Microsoft Corporation Netscape Navigator is a registered trademark of Netscape Communications Corporation All other product names company names logos or other designations mentioned herein are trademarks or registered trademarks of their respective owners Allied Telesis Inc reserves the right to make changes in specifications and other information contained in this document without prior written notice The information provided herein is subject to change without notice In no event shall Allied Telesis Inc be liable for any incidental special indirect or consequential damages whatsoever including but not limited to lost profits arising out of or related to this manual or the information contained herein even if Allied Telesis Inc has been advised of known or should have known the possibility of such damages Contents Preface ei cocci a 7 Where to Find Web based Guides eese eiseteeseeen enne nadar rene 8 Contacting Allied Telesis ure de get iie ente iem 9 Online SuUpDpOtL ihe de ete c ie detect a d te U
3. O In the None row click the port that you do not want to be included in the VLAN O Inthe VLAN Member row select the ports that you want to assign to the VLAN 7 Click Apply to implement your changes 8 To save the settings to the configuration file from the main menu select Save Configuration The Save Configuration page is shown in Figure 3 on page 14 9 Click Apply To view all the currently configured VLANs perform the following procedure 1 From the main menu select VLAN Configuration The VLAN Configuration page is shown in Figure 15 on page 43 2 Click Show All Static VLAN Entries Modifying a VLAN Deleting a VLAN AT S82 Management Software User s Guide The list of current VLANs is shown in Figure 17 1 default Modify 2 HQ Modify x 3 Finance Modify x E Figure 17 Current VLANs Page To modify the ports in a VLAN perform the following procedure 1 From the main menu select VLAN Configuration The VLAN Configuration page is shown in Figure 15 on page 43 2 Click Modify next to the VLAN you want to modify The VLAN detail page for that VLAN is displayed as shown in Figure 16 on page 43 e Make your changes to the VLAN A Click Apply to implement your changes 5 To save the settings to the configuration file from the main menu select Save Configuration The Save Configuration page is shown in Figure 3 on page 14 6 Click Apply To delete a VLAN
4. To configure the ports perform the following procedure 1 From the main menu select Port Configuration The Port Configuration page is shown in Figure 11 Port Configuration Medium Port1 Port1 v Enabled Auto v Disabled Copper Apply The Port Information Table Pert State Speed Duplex Flow Control Cennectien Duplex Flew Ctrl 1 Enabled Auto Disabled 100M Full None 2 Enabled Auto Disabled LinkDown B Enabled Auto Disabled LinkDown 4 Enabled Auto Disabled LinkDown 5 Enabled Auto Disabled LinkDown 6 Enabled Auto Disabled LinkDown OCA Enabled Auto Disabled LinkDown 7 E Enabled Auto Disabled LinkDown 8 C Enabled Auto Disabled LinkDown 8 PF Enabled Auto Disabled LinkDown Note F indicates fiber medium and C indicates copper medium in a combo port Figure 11 Port Configuration Page The top part of the page allows you to select port s and apply configuration parameters The bottom part shows the current configuration Ports 7 and 8 are listed twice once as a twisted pair port copper as ports 7R and 8R and once as an SFP fiber port as ports 7 and 8 This allows you to see if the port is operating as a twisted pair or SFP port or if the ports are operating in combo fashion AT S82 Management Software User s Guide Note Auto Speed Duplex is disabled when you manually configure a ports Speed Duplex In this situation you must use a crossover Ethernet cable to
5. Working with VLANs This section contains the following procedures for working with VLANs D Creating a VLAN next O Displaying all VLANs on page 44 O Modifying a VLAN on page 45 Creating a VLAN To create a VLAN perform the following procedure 1 From the main menu select Static VLANs The 802 1Q Static VLAN page is shown in Figure 15 802 1Q Static VLAN Add new 802 10 VLAN Add Current 802 1Q Static VLAN Entries VLANID WLAN name 1 default Modify Figure 15 802 1Q Static VLAN Page 2 Click Add A new page opens where you specify the VLAN as shown in Figure 16 802 1Q Static VLAN Port Settings rs o O O O O O O O O Show All Static VLAN Entries Figure 16 VLAN Detail Page 43 Chapter 5 VLANs 44 Displaying all VLANs 3 Inthe VID field supply a number for the VLAN ID from 2 to 4094 4 Inthe VLAN Name field enter a unique name for the VLAN No spaces are allowed 5 Inthe Tag row select the ports that you want to be tagged members of the VLAN Note If you want a port to be an untagged member of a different VLAN you must first modify the VLAN usually the default VLAN where the port is an untagged member First delete that port from the original VLAN and then assign the port to another VLAN as an untagged port 6 To select the ports you want to assign to the VLAN do one of the following
6. Table 6 lists the STP port costs Table 4 STP Port Costs Port Speed Port Cost 10 Mbps 100 100 Mbps 10 1000 Mbps 4 Table 5 lists the STP port costs with Auto when a port is part of a port trunk Table 5 STP Auto Detect Port Trunk Costs Port Speed Port Cost 10 Mbps 4 100 Mbps 4 1000 Mbps 2 Table 6 lists the RSTP port costs with Auto Table 6 RSTP Auto Port Costs Table 7 lists the RSTP port costs with Auto when the port is part of a port 60 Port Speed Port Cost 10 Mbps 2 000 000 100 Mbps 200 000 1000 Mbps 20 000 AT S82 Management Software User s Guide Table 7 RSTP Auto Port Trunk Costs Port Speed Port Cost 10 Mbps 20 000 100 Mbps 20 000 1000 Mbps 2 000 You cannot set the port cost manually Port Priority If two paths have the same port cost the bridges must select a preferred path In some instances this can involve the use of the port priority parameter This parameter is used as a tie breaker when two paths have the same cost The range for port priority is 0 to 240 As with bridge priority this range is broken into increments in this case multiples of 16 Table 8 lists the valid port priority values The default value is 128 which is increment 8 Table 8 Port Priority Value Increments Increment Fort Increment Port Priority Priority 0 0 8 128 1 16 9 144 2 32 10 160 3 48
7. perform the following procedure 1 From the main menu select VLAN Configuration The VLAN Configuration page is shown in Figure 15 on page 43 2 Click the X in the Delete column next to the VLAN you want to delete The VLAN is immediately deleted 45 Chapter 5 VLANs Protected Ports VLAN 46 You use the protected ports VLAN feature when you want to prevent ports from communicating with one another but you want them all to have access to common resources For example in a hotel or apartment complex the computer in each room or apartment needs to be isolated from one another but they all need access to the internet or a server This feature is called traffic segmentation You set up traffic segmentation by selecting the ports connected to each room or apartment and identifying them as isolated ports and then connecting one port to the WAN In Figure 18 the connection to the WAN is assigned to fiber port 8 This port is configured as the Primary Ingress port for the switch Because it is the Primary port it has full duplex capability to communicate with ports 1 7R Ports 1 7R are configured to be isolated from one another and therefore cannot communicate with one another d B l Aa Er El MV Alied Telesyn AT GS950 8 8 Port 10 100 1000Mbps 2 SFP Combo WebSmart Switch june Sane ere m aj Figure 18 Protected Ports VLAN Example Figure 19 shows what the Protect
8. 11 176 4 64 12 192 5 80 13 208 6 96 14 224 7 112 15 240 Forwarding Delay and Topology Changes If there is a change in the network topology due to a failure removal or addition of any active components the active topology also changes This may trigger a change in the state of some blocked ports However a change in a port state is not activated immediately It might take time for the root bridge to notify all bridges that a topology 61 Chapter 7 Spanning Tree Protocol STP 62 change has occurred especially if it is a large network If a topology change is made before all bridges have been notified a temporary data loop could occur and that could adversely impact network performance To forestall the formation of temporary data loops during topology changes a port designated to change from blocking to forwarding passes through two additional states listening and learning before it begins to forward frames The amount of time a port spends in these states is set by the forwarding delay value This value states the amount of time that a port spends in the listening and learning states prior to changing to the forwarding state The forwarding delay value is adjustable in the AT 882 management software The appropriate value for this parameter depends on a number of variables the size of your network is a primary factor For large networks you should specify a value large enough to allow the root br
9. 14 Click Apply AT S82 Management Software User s Guide Rebooting the Switch This procedure reboots the switch and reloads the AT S82 management software from flash memory You might reboot the device if you believe it is experiencing a problem Rebooting the device does not change any of the device s parameter settings Caution The switch does not forward network traffic during the reboot process Some network traffic may be lost To reboot the switch perform the following procedure 1 From the main menu select Reboot The Reboot page is shown in Figure 6 Are you sure you want to proceed with the system reboot If yes click Reboot Figure 6 Reboot Page 2 Click Reboot The switch immediately begins to reload the AT S82 management software This process takes approximately one minute to complete You can not manage the device during the reboot After the reboot is finished you can log in again if you want to continue to manage the switch 23 Chapter 2 Basic Switch Parameters Resetting the Switch and Retaining the IP Address 24 There are two options for resetting the switch resetting all the parameters except the IP address or resetting the switch to return all the parameters to their default values The procedure for resetting the switch to the default values is described in Returning the AT S82 Management Software to the Factory Default Values on page 25 To reset th
10. 8 WebSmart switch even when all other switches are running STP The switch can combine its RSTP with the STP of the other switches The switch monitors the traffic on each port for BPDU packets Ports that receive RSTP BPDU packets operates in RSTP mode while ports receiving STP BPDU packets operate in STP mode The spanning tree implementation in the AT S82 management software is a single instance spanning tree The switch supports just one spanning tree You cannot define multiple spanning trees The single spanning tree encompasses all ports on the switch If the ports are divided into different VLANs the spanning tree crosses the VLAN boundaries This point can pose a problem in networks containing multiple VLANs that span different switches and are connected with untagged ports In this situation STP blocks a data link because it detects a data loop This can cause fragmentation of your VLANs This issue is illustrated in Figure 27 Two VLANs Sales and Production span two AT GS950 8 WebSmart switches Two links consisting of untagged ports connect the separate parts of each VLAN If STP or RSTP is activated on the switches one of the links is disabled In the example the port on the top switch that links the two parts of the Production VLAN is changed to the block state This leaves the two parts of the Production VLAN unable to communicate with each other Sales Production VLAN VLAN Blocked Port P AS M X
11. Apply To save the settings to the configuration file from the main menu select Save Configuration The Save Configuration page is shown in Figure 3 on page 14 Click Apply 71 Chapter 7 Spanning Tree Protocol STP 72
12. Id o 23 Resetting the Switch and Retaining the IP Address ssssssssseeeeeeene nennen erre 24 Returning the AT S82 Management Software to the Factory Default Values eeeeee 25 Downloading New Firmware eee ececeen nee eet enne eet E A R tte sedente nennen d nena 26 Chapter 3 Port Configuration 00 0 0 ter ne ne eee eee nennen enne nn ennrnn eee enne e nennen enn 27 Configuring Port Parameters teret RR ARA AE dais 28 Chapter 4 Trunking educ e edd end de ede a a e dude dee del eade ev o dede te e da 31 TTUNKIN O VEIS Wii 32 TRUNKING Guidelines 000000 did 32 Trunking AlgorlthiTi 2 rere dore dada 32 Configuring the Trunking Algorithm an eere aiaeeiiee i enne nennen nnne enne nnn nennen nnns enr nnne nnns 34 Setting Up the TUN Ser 35 Chapter 5 VEANS 7 nous eae A uM a M TL M EE Mcd ae 37 QUE MICE 38 Increased Performarice Der c RR EP PURGE IR EE sauce Em ene ds 38 Improved Manageabllity 51 5 2 1 d Ete et edt e mtem e RR 38 Increased Security sis ven ede a necne 38 VEAN OVEIVIOW seccional acaba ira indicio 40 VLAN NAIME a NA 40 VEAN Identifier center rta edens Np tetti ree teen t bu det aerials 40 LAN Port Members ettet eed is 40 Tagged Port A NN 41 Untagged Port Members nica td rU NER 41 Incoming and Outgoing Tagged and Untagged Frames c oococccccncocccccconcancnccnanannnnncnnno eene 41 Incomirig FTames s eee tur GREATE
13. MV Allied Telesyn AT GS950 8 8 Port 10 100 1000Mbps 2 SFP Combo WebSmart Switch AU 9 ca erre om os EL TETE M SEAN ei 912 Sales Production VLAN VLAN Figure 27 VLAN Fragmentation You can avoid this problem by not activating spanning tree or by connecting VLANs using tagged instead of untagged ports For 65 Chapter 7 Spanning Tree Protocol STP information on tagged and untagged ports refer to Chapter 5 VLANs on page 37 66 Configuring Spanning Tree AT S82 Management Software User s Guide To define the spanning tree settings at the switch level perform the following procedure 1 From the main menu select STP Global Settings The Switch Spanning Tree Settings page is shown in Figure 28 Root Max Age Hello Time Forward Delay Hold Time Switch Spanning Tree Settings Disabled 6 40 Sec 20 2 15 32768 Default Path Cost 802 1T STP Version RSTP v 3 Forwarding BPDU Enabled v s s allo 8 HE ERE REC ABABA z EEE E IS SS a a sje a as va va joa va SOI E e ole an fee r O mp a PI los qa el A LEN Ss Fl 2 SFELIHIE B E e q E Fila gt s A al gt e gaio m S T eo 2 iz n A E 3 lt z Z8 gt gt siolB a T H gn SHEHE amp amp g Apply Note 2 Forward Delay 1 Max Age Max Age gt 2 Hello Time 1 Figure 28 Switch
14. Port Trunking Configuration Greup ID 1 iv Disabled vw Type Poti vw pean a 2 js is Js Jo 7 Js Flooding Port None Apply Note A trunk can consist of up to two ports and a port can be a member of only one trunk group at a time Show All Port Trunking Group Entries gt E d o a Figure 14 Port Trunking Configuration Page 35 Chapter 4 Trunking 36 For the Group ID choose a trunk group ID from the list IDs from 1 through 4 are available Note that when you choose a group ID that ports are automatically selected on the Port Map You cannot designate any other ports for the trunk For the State choose the state of the trunk either enabled or disabled Note Ignore the Master Port field The Active Port field displays which ports in the trunk have established an active link The Flooding port field displays the lowest active port in the trunk pair Click Apply to implement your changes To save the settings to the configuration file from the main menu select Save Configuration The Save Configuration page is shown in Figure 3 on page 14 Click Apply Chapter 5 VLANSs Section I Using the Menus Interface This chapter contains the following sections VLAN Features on page 38 VLAN Overview on page 40 Working with VLANs on page 43 Protected Ports VLAN on page 46 u uuu 37 Chapter 5 VLANs VLAN Features 38 Increased Performance Improve
15. Protocol STP prevents data loops from forming by ensuring that only one path exists between the end nodes in your network Where multiple paths exist these protocols place the extra paths in a standby or blocking mode leaving only one main active path STP can also activate a redundant path if the main path goes down So not only do these protocols guard against multiple links between segments and the risk of broadcast storms but they can also maintain network connectivity by activating a backup redundant path in case a main link fails Where the two protocols differ is in the time each takes to complete the process referred to as convergence When a change is made to the network topology such as the addition of a new bridge a spanning tree protocol must determine whether there are redundant paths that must be blocked to prevent data loops or activated to maintain communications between the various network segments This is the process of convergence With STP convergence can take up to a minute to complete in a large network This can result in the loss of communication between various parts of the network during the convergence process and the subsequent lost of data packets The STP implementation on the AT S82 management software complies with the IEEE 802 1d standard The first task that bridges perform when a spanning tree protocol is activated on a network is the selection of a root bridge A root bridge distributes network
16. available 3 Click Apply to implement your changes 4 To save the settings to the configuration file from the main menu select Save Configuration The Save Configuration page is shown in Figure 3 on page 14 5 Click Apply Chapter 2 Basic Switch Parameters Disabling or Enabling Ping Blocking You can allow the switch to respond to ping requests by setting the Ping Blocking parameter The default setting is enabled which means that the switch does not respond to ping requests To disable or enable ping blocking perform the following procedure 1 From the main menu select Basic Switch Information The Basic Switch Information page is shown in Figure 4 on page 18 2 For Ping Blocking choose one of the following Enabled The switch does not respond to ping requests This is the default Disabled The switch responds to ping requests Allied Telesis recommends that you choose this setting 3 Click Apply to implement your changes 4 To save the settings to the configuration file from the main menu select Save Configuration The Save Configuration page is shown in Figure 3 on page 14 5 Click Apply 20 AT S82 Management Software User s Guide Enabling or Disabling 802 1X Forwarding Control This procedure describes how to enable or disable 802 1x forwarding control The default setting is disabled When you disable this feature 802 1x packets are not forwarded If this feature is enabled these p
17. bridge for that LAN The range is 0 to 65 535 The default setting is Auto which sets port cost depending on the speed of the port The Auto default values are shown in Table 4 on page 60 andTable 5 on page 60 In the Priority box type a number for the port s priority 10 11 AT S82 Management Software User s Guide This parameter is used as a tie breaker when two or more ports are determined to have equal costs to the root bridge The range is O to 240 in increments of 16 The default value is 8 priority value 128 For a list of the increments refer to Table 8 Port Priority Value Increments on page 61 From the Migration list select one of the following No Disallows resetting an RSTP port to handle STP BPDUS This is the default setting Yes Resets an RSTP port allowing it to send RSTP BPDUs When an RSTP bridge receives STP BPDUs on an RSTP port the port transmits STP BPDUs The RSTP port continues to transmit STP BPDUs indefinitely From the Edge list select one of the following False The port does not function as an edge port True Makes the port an edge port Note A port can be both a point to point and an edge port at the same time In the P2P list select one of the following Auto The switch automatically detects if the port is functioning as a point to point port False Sets the port to never function as a point to point port True Sets the port to always function as a point to point port Click
18. save the changes after you are done with all your changes and before you exit the web browser Note If you do not save changes using the Save Configuration page your changes are lost when the switch is rebooted To save your configuration changes perform the following procedure 1 From the main menu select Save Configuration The Save Configuration page is shown in Figure 3 Save Configuration Save system configuration to NV RAM Apply Figure 3 Save Configuration Page 2 Click Apply AT S83 Management Software User s Guide Quitting a Management Session To quit a management session close the web browser Chapter 1 Getting Started 16 Chapter 2 Basic Switch Parameters This chapter contains the following sections Q Configuring the IP Address Subnet Mask Gateway Address and BOOTP or DHCP on page 18 Disabling or Enabling Ping Blocking on page 20 Enabling or Disabling 802 1X Forwarding Control on page 21 Changing the Administrator s Password on page 22 Rebooting the Switch on page 23 Resetting the Switch and Retaining the IP Address on page 24 o2 uuuuiu Returning the AT S82 Management Software to the Factory Default Values on page 25 a Downloading New Firmware on page 26 Chapter 2 Basic Switch Parameters Configuring the IP Address Subnet Mask Gateway Address and BOOTP or DHCP This procedure explains how to assign an IP address
19. Apply to implement your changes To save the settings to the configuration file from the main menu select Save Configuration The Save Configuration page is shown in Figure 3 on page 14 10 Click Apply Chapter 4 Trunking Section I Using the Menus Interface This chapter contains the following sections a Trunking Overview on page 32 a Configuring the Trunking Algorithm on page 34 O Setting up the Trunk on page 35 31 Chapter 4 Trunking Trunking Overview 32 Trunking Guidelines Trunking Algorithm A port trunk is an economical way for you to increase the bandwidth between the Ethernet switch and another networking device such as a network server router workstation or another Ethernet switch A port trunk is a group of ports that have been grouped together to function as one logical path A port trunk therefore increases the bandwidth between the switch and the other network device and is useful in situations where a single physical link between the devices is insufficient to handle the traffic load The AT S82 management software provides for four trunks with a maximum of two ports each Because network vendors employ different techniques to implement trunking a trunk on one device might not be compatible with the same feature on a device from another manufacturer Therefore trunks are typically made only between devices from the same vendor If a port in a static trunk loses its
20. R RB DRM 41 AA PETI 41 Contents Guidelines for Creating a VLAN isisisi erini ii Eae EE AAPEEE NESEN na tras nant aaa nauis 42 Working AUN 43 Greatirig a VLAN ince ene eee nie deine e lege nd cu sia ede em dde nee el ae 43 Displaying ERE re EE 44 Modifying a VLAN EE 45 Deleting a VLAN n a A a id 45 Protected Ports VLAN esiisa heireda alee dale niece a di a 46 Chapter 6 Class of Service onc tede pea a D e te sit a e bie dated danita 49 Class of Service OVervioW e Ier Ib E LIE UR ELE gana ee da int a e o ER P tiU 50 Mapping Ports to Egress Queues ieessseeeeeseseteeeeee nn teen nennen tibns e intra ases tt ed d anna sera sanas ne sa nen ioca 50 SENECU aaa 51 Mapping Priorities to Quels 3 1 reete E iate ete dedii e qu ete dlls in cbe atento losa dioa e aas shade 53 Setting Up the Schedule 3 pnto t PEL e Pe A ened oars 54 Assigning Priority to Ports sch 8 A e eb bets 55 Chapter 7 Spanning Tree Protocol STP ssssssssee eem eene nennen nennen 57 Spanning Tree OVEIVISW inicio 58 Bridge Priority and the Root Bridge oooooocccnnnnnncccccnnnncccccnnnnnnononnnn conan cnn nr n cnn cnn rn nn nennen ner nnne nnn nene 58 Path Costs and Port Costs iii acia 59 POFLPEOFIL adoret LP b e tb die m duce utr en RUN 61 Forwarding Delay and Topology Changges sssssssssssseeee eene nennen 61 Hello Time and Bridge Protocol Data Units BPDUS
21. Spanning Tree Settings Page 2 From the STP Version list select STP or RSTP 3 In the Bridge Max Age field enter a number for the length of time after which stored bridge protocol data units BPDUs are deleted by the bridge All bridges in a bridged LAN use this aging time to test the age of stored configuration messages called bridge protocol data units BPDUS For example if you use the default value 20 all bridges delete current configuration messages after 20 seconds This parameter can be from 6 to 40 seconds 67 Chapter 7 Spanning Tree Protocol STP 68 When you select a value for maximum age observe the following rules MaxAge must be greater than 2 x HelloTime 1 MaxAge must be less than 2 x ForwardingDelay 1 Note The aging time for BPDUs is different from the aging time used by the MAC address table In the Bridge Hello Time field enter a number for the time interval between generating and sending configuration messages by the bridge This parameter can be from 1 to 10 seconds The default is 2 seconds In the Bridge Forward Delay field enter a number for the waiting period in seconds before a bridge changes to a new state for example becomes the new root bridge after the topology changes If the bridge transitions too soon not all links may have yet adapted to the change resulting in network loops The range is 4 to 30 seconds The default is 15 seconds In the Bridge Priority fi
22. a ent dalla t 9 Email and Telephone Suppott c ccccccceceeeeeeeeeeeeeaecaeeeeeeeeeeeceseccaaaaaeaaeceeeeeeeeeeeseceacccacaeeeeeeeeeeeseeeeeeenaees 9 Returning Products 25 ion pred ee a et ans 9 Sales or Corporate Information eerie tnmen nne ntn tnnt tren aset tta nen nhan nan trennen ntn 9 Management Software Updates ceccccccecesecccceeeseecceeeesenacceeeseseaceceeeneaeaeenensuacaeeeenuceeeneeseesaeensneceeeneeneaaees 9 Chapter 1 Getting Started airna eie aaie aee ee eee eee aads e nennen innen nen 11 Starting a Management Session ssssssssssssssssesssee enne eene nennen rns nenne nennen nnns enr nennen 12 saving Changes ri P ea e de dte eter cbe ee 14 Quitting a Management Session cassier eadi eide enne adi iNe a nnns innen rnnt nennen nnne nnns 15 Chapter 2 Basic Switch Parameters ccccccccccceeeeeeeeeeceeaeceeeeeeeeeeeeseceacaaeaaeaeeeeeeeeeeeseesenseaaeeaeeeeeees 17 Configuring the IP Address Subnet Mask Gateway Address and BOOTP or DHCP sss 18 Disabling or Enabling Ping BloCkiNQ oooocccconcocccccnnononcccccnanancnononanoncnnncnano nc nono nano nennen nennen nnne enne enne 20 Enabling or Disabling 802 1X Forwarding Control sssseeeee eene nennen enne 21 Changing the Administrators PasswoTdO oooonccccnnnnoccccccononcnncccanoncnnccnnnonnnccnnnon nnne nennen nennen inneren enne nnns 22 Rebootingithe Switch onec aedi
23. ackets are forwarded to their destination which might be a switch running an authentication protocol To disable or enable 802 1X forwarding control perform the following procedure 1 From the main menu select Basic Switch Information The Basic Switch Information page is shown in Figure 4 on page 18 For 802 1X Forwarding Control choose one of the following Enabled The switch does not respond to ping requests This is the default Disabled The switch responds to ping requests Click Apply to implement your changes To save the settings to the configuration file from the main menu select Save Configuration The Save Configuration page is shown in Figure 3 on page 14 Click Apply 21 Chapter 2 Basic Switch Parameters Changing the Administrator s Password 22 To reset the administrator s password perform the following procedure 1 From the main menu select Administrator Password The Administrator Password page is shown in Figure 5 Administrator Password Old Password Confirm Password Apply Figure 5 Administrator Password Page In the Old Password field type the old password In the New Password field type the new password In the Confirm Password field retype the new password Click Apply to implement your changes To save the settings to the configuration file from the main menu select Save Configuration The Save Configuration page is shown in Figure 3 on page
24. cess takes approximately one minute to complete You cannot manage the switch during the reboot After the reboot is finished you must start a new web browser management session if you want to continue to manage the switch 25 Chapter 2 Basic Switch Parameters Downloading New Firmware To download new firmware onto the switch perform the following procedure 1 From the main menu select Download Firmware The Download Firmware page is shown in Figure 9 Download Firmware Server IP Address File Name Figure 9 Download Firmware Page 2 In the Server IP Address field type the IP address of the server where the firmware file is located 3 In the File Name field type the path for the firmware file 4 Click Start A series of download status messages such as the one shown in Figure 10 report the status of the download process until itis complete and the flash memory has been updated Download Firmware Percentage Current Status Figure 10 Download Status Message 26 Chapter 3 Port Configuration This chapter contains the following section O Configuring Port Parameters on page 28 Section I Using the Menus Interface 27 Chapter 3 Port Configuration Configuring Port Parameters 28 This procedure explains how to configure the following port parameters State Speed and duplex mode O O O Flow control O Medium type only for ports 7 and 8
25. connect that port to another network device 2 To set the parameters for a port choose the port using the From and To lists You can select one port From 2 To 2 for example or a range of ports From 1 To 5 for example 3 From the State list choose one of the following Enabled The port is enabled This is the default Disabled The port is disabled 4 From the Speed Duplex list select one of the following o Auto When you select this option the switch automatically sets the speed and duplex mode of the port The switch determines the highest possible common speed between the port and its end node and sets the port to that setting This helps ensure that the port and its end node are operating at the highest possible speed In order for a switch port to successfully autonegotiate its duplex mode with an end node the end node should also be using autonegotiation Otherwise a duplex mode mismatch can occur A switch port using autonegotiation defaults to half duplex if it detects that the end node is not using autonegotiation This results in a mismatch if the end node is operating at a fixed duplex mode of full duplex To avoid this problem on the copper ports when you connect an end node with a fixed duplex mode of full duplex to a switch port you should disable autonegotiation on the port and set the port s speed and duplex mode manually If you think that a port and end node are not operating in the same duple
26. d Manageability Increased Security A Virtual Local Area Network VLAN is a logical grouping of devices on different physical LAN segments that allows users to communicate as if they were physically connected to a single LAN independent of the physical configuration of the network With VLANs you can segment your network and group end nodes with related functions into their own separate logical LAN segments For example the marketing personnel in your company may be spread throughout a building Assigning marketing to a single VLAN allows marketing personnel to share resources and bandwidth as if they were connected to the same segment The resources of other departments can be visible to the marketing VLAN members accessible or accessible only to specified individuals A few benefits of a VLAN architecture are described in the following sections In traditional Layer 2 switched networks broadcast packets are sent to each and every individual port Grouping users into logical networks limits broadcast traffic to users performing similar functions or users within individual workgroups High traffic the danger of broadcast storms router latency and data collisions are significantly reduced and the efficiency of the entire network is improved VLANs provide a fundamental improvement in the design administration and management of LANs Before VLANs physical changes to a network were made at the switch in the wiring closet Fo
27. e following Internet sites O Allied Telesis web site www alliedtelesis com O Allied Telesis FTP server ftp ftp alliedtelesis com To download new software from the Allied Telesis FTP server from your workstation s command prompt you must have FTP client software Additionally you must log in to the server The user name is anonymous and your email address is the password Preface 10 Chapter 1 Getting Started This chapter provides information and instructions on how to access the AT S82 management software by starting a web browser management session This chapter contains the following sections O Starting a Management Session on page 12 O Saving Changes on page 14 D Quitting a Management Session on page 15 Chapter 1 Getting Started Starting a Management Session You establish a local management session with the AT GS950 8 switch by connecting an Ethernet cable to one of the eight ports on the front panel of the switch To start a management session perform the following procedure 1 Start a web browser 2 In the URL field of the web browser enter the default IP address of the switch 192 168 1 1 The AT S82 management software displays the login dialog box shown in Figure 1 Connect to 192 168 1 1 72 AN AT GS950 8 Web Management System User name manager Password e Remember my password Figure 1 Login Dialog Box 3 Enter the admin
28. e switch and retain the IP address perform the following procedure 1 From the main menu select Reset The Reset page is shown in Figure 6 Switch will reset all parameters except the IP address Are you sure you want to proceed with a reset If yes click Apply Apply Figure 7 Reset Page 2 Click Apply The switch is reset AT S82 Management Software User s Guide Returning the AT S82 Management Software to the Factory Default Values This procedure returns all AT S82 management software parameters to their default values including the IP address which is reset to 192 168 1 1 To reset all the parameters except the IP address follow the procedure in Resetting the Switch and Retaining the IP Address on page 24 N Caution This procedure causes the switch to reboot The switch does not forward network traffic during the reboot process Some network traffic may be lost To return the AT S82 management software to the default settings perform the following procedure 1 From the main menu select Reset System The Reset System page is shown in Figure 8 Reset System Warning Switch will be reset to factory defaults and rebooted Are you sure you want to proceed with a reset If yes click Apply Apply Figure 8 Reset System Page 2 Click Apply The switch returns its operating parameters to the default values and begins to reload the AT S82 management software This pro
29. ed Port page for Figure 18 looks like Protected Port IMEEM EM HM EM EM MEME MEM NON ce Note Unchecked ports belong to Primary Please refer to the following table Primary Egress Isolated Egress Primary Ingress Permit Permit Isolated Ingress Permit Deny Figure 19 Protected Port Page for Figure 18 To set up a protected ports VLAN perform the following procedure AT S82 Management Software User s Guide 1 From the main menu select Protected Port The Protected Port page is shown in Figure 20 Protected Port Isolated L lll dem O A eee A Pert ss O O O a O O O Note Unchecked ports belong to Primary Please refer to the following table Primary Egress Isolated Egress Primary Ingress Permit Permit Isolated Ingress Permit Deny Figure 20 Protected Port Page 2 Determine which port s will be the Primary port s 3 Click the box on the Isolated row for all ports that you want to isolate from one another The box for the Primary port s should be empty 4 Click Apply 47 Chapter 5 VLANs 48 Chapter 6 Class of Service Section I Using the Menus Interface This chapter contains the following sections O Class of Service Overview on page 50 O Mapping Priorities to Queues on page 53 O Setting Up the Schedule on page 54 49 Chapter 6 Class of Service Class of Service Overview Mapping Ports to 50 Egre
30. eld enter a number for the priority number for the bridge This number is used to determine the root bridge for RSTP The bridge with the lowest priority number is selected as the root bridge If two or more bridges have the same priority value the bridge with the numerically lowest MAC address becomes the root bridge When a root bridge goes offline the bridge with the next priority number automatically takes over as the root bridge This parameter can be from 0 zero to 61 440 in increments of 4096 with O being the highest priority For a list of the increments refer to Table 3 Bridge Priority Value Increments on page 59 From the STP Version list select one of the following RSTP Enables the Remote Spanning Tree Protocol STP Compatible Enables the Spanning Tree Protocol In the TX Hold Count field enter a number from 1 to 10 to specify the maximum number of BPDU packets in each hello time From the Forwarding BPDU list select one of the following Enabled The AT GS950 8 WebSmart switch does not process the BPDU AT S82 Management Software User s Guide packets but forwards them to adjacent switches This is the default setting Disabled The switch processes the BPDU packets Allied Telesis recommends that you choose this setting 10 Click Apply To configure the ports refer to Configuring STP Port Settings next 11 To save the settings to the configuration file from the main menu select Save Configurat
31. ery two seconds AT S82 Management Software User s Guide Point to Point and Edge Ports Note This section applies only to RSTP Part of the task of configuring RSTP is defining the port types on the bridge This relates to the device s connected to the port With the port types defined RSTP can reconfigure a network much quicker than STP when a change in network topology is detected There are two possible selections O Point to point port O Edge port If a bridge port is operating in full duplex mode than the port is functioning as a point to point port Figure 24 illustrates two AT GS950 8 WebSmart switches that have been connected with one data link With the link operating in full duplex the ports are point to point ports AVE Mied Telesyn AT GS950 8 8 Port 10 1001 Ibps 2 SFP A N W Point to Point Ports Full duplex Mode MAME Alied Telesyn AT GS950 8 5 Por ior Figure 24 Point to Point Ports If a port is operating in half duplex mode and is not connected to any further bridges participating in STP or RSTP then the port is an edge port Figure 25 illustrates an edge port on an AT GS950 8 WebSmart switch The port is connected to an Ethernet hub which in turn is connected to a series of Ethernet workstations This is an edge port because it is connected to a device operating at half duplex mode and there are n
32. f the VLAN on the different switches should be assigned the same VID D A port can be an untagged member of only one VLAN at a time and can receive both tagged and untagged packets C If you want a port to be an untagged member of a different VLAN you must first modify the VLAN usually the default VLAN where the port is an untagged member First delete that port from the original VLAN and then assign the port to another VLAN as an untagged port O A VLAN that spans multiple switches requires a port on each switch where the VLAN is located to function as an interconnection between the switches where the various parts of the VLAN reside This port may be defined as an untagged member of a VLAN where the port is connected to another switch via another untagged port member of the VLAN This means that all traffic on this inter switch port contains traffic for that VLAN only Another scenario is where the port could be an untagged member of one VLAN and a tagged member of one or more VLANs The port would then be connected to another switch via a port with the same VLAN membership This means that the traffic on this inter switch port is for any or all of the VLANs of which the port is a member O If there are end nodes in different VLANs that need to communicate with each other a router or Layer 3 switch is required to interconnect the VLANs The switch can support up to a total of 255 VLANs AT S82 Management Software User s Guide
33. frame to an outgoing port and before transmitting it the switch determines if the tag information should be kept in the header or should be stripped out and made into an untagged frame Incoming Frames Tagged frames received by the switch are only accepted not dropped if the tag information contained in the frame is equal to one of the VIDs of which the port is a member If the tag information contained in the frame does not match one of these VIDs the frames are dropped or discarded Untagged frames received by the switch are always accepted by all ports on the switch Each untagged frame is assigned to the VLAN number of which the port is an untagged member The switch then forwards this frame to one of the other member ports of that VLAN Outgoing Frames Frames being transmitted from the switch retain their VLAN tag information in the frame header if the frame s tag does not match the PVID of the port a tagged member of that VLAN These frames are untagged after transmission from the switch The VLAN tag information in the header of the frame is stripped from the frame s header if the tag matches the PVID of the port an untagged 41 Chapter 5 VLANs Guidelines for Creating a VLAN 42 member of the VLAN These frames are untagged after transmission from the switch The following are guidelines for creating a VLAN O Each VLAN must be assigned a unique VID If a particular VLAN spans multiples switches each part o
34. idge sufficient time to propagate a topology change throughout the entire network For small networks you should not specify a value so large that a topology change is unnecessarily delayed which could result in the delay or loss of some data packets Note The forwarding delay parameter applies only to ports on the switch that are operating STP compatible mode Hello Time and Bridge Protocol Data Units BPDUs The bridges that are part of a spanning tree domain communicate with each other using a bridge broadcast frame that contains a special section devoted to carrying STP or RSTP information This portion of the frame is referred to as the bridge protocol data unit BPDU When a bridge is brought online it issues a BPDU in order to determine whether a root bridge has already been selected on the network and if not whether it has the lowest bridge priority number of all the bridges and should therefore become the root bridge The root bridge periodically transmits a BPDU to determine whether there have been any changes to the network topology and to inform other bridges of topology changes The frequency with which the root bridge sends out a BPDU is called the hello time This is a value that you can set in the AT S82 management software The interval is measured in seconds and the default is two seconds Consequently if an AT GS950 8 WebSmart switch is selected as the root bridge of a spanning tree domain it transmits a BPDU ev
35. ion The Save Configuration page is shown in Figure 3 on page 14 12 Click Apply 69 Chapter 7 Spanning Tree Protocol STP Configuring STP Port Settings To configure the STP settings perform the following procedure 1 From the main menu select STP Port Settings The STP Port Settings page is shown in Figure 29 STP Port Settings CTP Pant Satra E E Portl wj Pot1 Enabled 0 No vw False w Auto vw he STP Port Information STP pes mn Joes rE MN 1 100MFullNone Yes 2000000 Yes Forwarding NonStp 2 Link Down Yes 2000000 128 No Yes Disabled Disabled B Link Down Yes 2000000 128 No Yes Disabled Disabled 4 Link Down Yes 2000000 128 No Yes Disabled Disabled B Link Down Yes 2000000 128 No Yes Disabled Disabled 6 Link Down Yes 2000000 128 No Yes Disabled Disabled 7 Link Down Yes 2000000 128 No Yes Disabled Disabled 8 Link Down Yes 2000000 128 No Yes Disabled Disabled 70 Figure 29 STP Port Settings Page From the From and To lists select the port s you want to configure or scroll through the list below From the State list select one of the following Enabled Enables the port for spanning tree This is the default Disabled Disables spanning tree on the port In the Cost box type a number for the cost or type 0 for Auto automatic The spanning tree algorithm uses the cost parameter to decide which port provides the lowest cost path to the root
36. istrator s default name manager 4 Enter the administrator s default password friend Note To change the administrator s password refer to Changing the Administrator s Password on page 22 AT S83 Management Software User s Guide The main page which by default displays the Basic Switch Information page is shown in Figure 2 Basic Switch Information Reboot Reset Boot PROM Version Build 1 01 B04 ey ji E AT GS950 8 Web Management System Firmware Version D 1 01 B47 E Basic Switch Information m MAC Address 00 00 01 02 03 04 Port Configuration E Trunking Algorithm Web TCP Port 80 D cos Output Scheduling IP Address 149 358 241 S Priori du unun Subnet Mask 255 255 255 0 Cos Port Priority Assignment Ej VLAN Configuration Default Gateway 0 0 0 0 B Protected Port VLAN Name default j STP Bridge Global Settings VLAN Mode 802 1q y Is Ping Blocking Enabled v 6 Administrator Password a 1 E Download Fi 802 1X Forwarding Control Disabled ownload Firmware E Save Configuration Apply i3 i3 i3 Reset System Figure 2 Main Page 13 Chapter 1 Getting Started Saving Changes The management software applies the changes you make when you click the Apply button on any web page However the management software does not automatically save the changes you make to the configuration file You can save your changes to the configuration file each time that you change a parameter or
37. link the trunk s total bandwidth is reduced until the lost link is reconfigured The following are guidelines for setting up trunking To ensure compatibility set up trunks only between AT GS950 8 devices O The trunk always contains two ports one of which is designated the master port O The AT S82 management software is preconfigured for you to select trunks 1 2 3 or 4 with ports preassigned to each trunk Trunk 1 has ports 1 and 2 trunk 2 has ports 3 and 4 and so forth You cannot alter either setting O Before you create a trunk examine the speed duplex mode and flow control settings of all the ports that will be in the trunk Verify that the port settings are identical O After you create a trunk do not change the speed duplex mode or flow control setting of any port in the trunk without making the same changes to the other ports O The ports of the trunk must be members of the same VLAN O The switch selects the lowest numbered port in the trunk to handle broadcast packets and packets of unknown destination For example in trunk 2 containing ports 3 and 4 port 3 is used for broadcast packets One of the steps in creating a trunk is the selection of a load distribution method also known as the trunking or load distribution algorithm This algorithm determines how the switch distributes the traffic load across the ports of the trunk The AT S82 management software provides three load AT S82 Management S
38. ls 35 802 1Q Static VLAN Page en ii eet e a de A ee de o ae 43 VEAN MBICINZ IEEE 43 eicJAu m EX 45 Protected Ports VLEAN Example 2 3 5 Brenta xt eet deri ted rate er neni dee fe ie aiaiai 46 Protected Port Page for Figure TB coi a eec ed eene 46 Protected Port Page ee ere ea Re CERE RU Lect E Re ee Renta 47 Cos Priority to Queue Page ih dee iere ica 53 Output Scheduling Page 5 n RR 54 CoS Port Priority Assignment Page sssssssssseeesee een nennen nennen nene enhn ennr nen nennen nnn enne nnne 55 Poirit to Point Ports e Ari ed t 63 Edge POMt a EET 64 Point to Point and Edge Port ed ceteri entrent rene seeded ee ug a ld e eae deae n pee dea eode dee Tues 64 VEAN Fragmentation iss cass cise 65 Switch Spanning Tree Settings Page nennen rr rn nnne nennen nnnm en nennen nenne 67 STP Port Settings PAYO iia cei vene inlet dieses 70 Figures Preface This guide contains instructions on how to use the AT S82 management software to manage the AT GS950 8 Smart Switch switch This preface contains the following sections O Where to Find Web based Guides on page 8 o Contacting Allied Telesis on page 9 Preface Where to Find Web based Guides The installation and user guides for all Allied Telesis products are available in portable document format PDF on our web site a
39. o participating STP or RSTP devices connected to it 63 Chapter 7 Spanning Tree Protocol STP MME Alied Telesyn AT GS950 8 a Port 10 100 1000Mbps 2 SFP Combo WebSman Switch Figure 25 Edge Port A port can be both a point to point and an edge port at the same time It operates in full duplex and has no STP or RSTP devices connected to it Figure 26 illustrates a port functioning as both a point to point and edge port AE Alied Telesyn i AT GS950 8 8 Port 10 100 1000Mbps 2 SFP Combo WebSmart Switch E Dune ote AG TT gt ee oil ms n Point to Point and Edge Port Workstation i Full duplex Mode Figure 26 Point to Point and Edge Port Determining whether a bridge port is point to point edge or both can be a bit confusing For that reason do not change the default values for this RSTP feature unless you have a good grasp of the concept In most cases the default values work well RSTP IEEE 802 1w is fully compliant with STP IEEE 802 1d Your network can consist of bridges running both protocols STP and RSTP in the same network can operate together to create a single spanning tree domain 64 Spanning Tree and VLANs AT S82 Management Software User s Guide If you decide to activate spanning tree on the switch there is no reason not to activate RSTP on an AT GS950
40. ocreate a port based VLAN you must give it a name The name should reflect the function of the network devices that are be members of the VLAN Examples include Sales Production and Engineering VLAN Identifier Every VLAN in a network must have a unique number assigned to it This number is called the VLAN identifier VID This number uniquely identifies a VLAN in the switch and the network The factory default VID is 1 for all ports If a VLAN consists only of ports located on one physical switch in your network you assign it a VID different from all other VLANs in your network If a VLAN spans multiple switches then the VID for the VLAN on the different switches should be the same The switches are then able to recognize and forward frames belonging to the same VLAN even though the VLAN spans multiple switches For example if you had a VLAN titled Marketing that spanned three AT GS950 8 switches you would assign the Marketing VLAN on each switch the same VID VLAN Port You need to specify which ports on the switch are to be members of a Members VLAN A port can be specified as a member of one or more VLANs up to 255 the maximum number of VLANs supported by the switch The factory default VID is 1 Therefore each port is initially configured to be a member of VLAN 1 which is known as the default VLAN Note The switch is preconfigured with the Default VLAN only All ports on the switch are initially members of the Default VLAN
41. oftware User s Guide distribution methods O MAC SA source MAC address O MAC DA destination MAC address O DAxorSA destination MAC address source MAC address 33 Chapter 4 Trunking Configuring the Trunking Algorithm To configure the trunk load method perform the following procedure 1 From the main menu select Trunking Algorithm The Trunking Algorithm page is shown in Figure 12 runking Algorithm Link Aggregation Algorithm MAC SA v Figure 12 Trunking Algorithm Page 2 Choose one of the load methods from the list MAC SA By the source MAC address MAC DA By the destination MAC address DAxorSA Using either the destination MAC address or source MAC address 3 Click Apply to implement your changes 4 To save the settings to the configuration file from the main menu select Save Configuration The Save Configuration page is shown in Figure 3 on page 14 5 Click Apply 34 AT S82 Management Software User s Guide Setting up the Trunk To set up the trunk perform the following procedure 1 From the main menu select Port Trunking The Port Trunking page is shown in Figure 13 Port Trunking Group Add New Trunking Group Add Current Trunking Group Entries Figure 13 Port Trunking Page The current trunks if any are shown in the Current Trunking Group Entries area 2 Click Add The Port Trunking Configuration page is shown in Figure 14
42. r example if an employee transferred to a new department changing that employee s LAN segment assignment often required a physical wiring change at the switch As a software base solution VLANs eliminate the restriction of existing network design and cabling infrastructure and allow the centralized configuration of switches located in many different locations VLAN memberships are changed quickly and efficiently from the management console rather than in a wiring closet VLANs provide additional security not available in a shared media network environment Because a switched network only delivers frames to intended recipients and only broadcast frames to other members of the VLAN a network administrator can segment users requiring access to sensitive information into separate VLANs from the rest of the general user community AT S82 Management Software User s Guide VLANS can be used to control the flow of data in your network since the traffic generated by an end node in a VLAN is restricted to the other end nodes in the same VLAN In addition VLANs can prevent data from flowing to unauthorized end nodes 39 Chapter 5 VLANs VLAN Overview This VLAN overview contains the following sections VLAN Name next VLAN Identifier on page 40 VLAN Port Members on page 40 Incoming and Outgoing Tagged and Untagged Frames on page 41 u uuu iau Guidelines for Creating a VLAN on page 42 VLAN Name T
43. s After the root bridge has been selected the bridges must determine if the network contains redundant paths and if one is found they must select a preferred path while placing the redundant paths in a backup or blocking state Where there is only one path between a bridge and the root bridge the bridge is referred to as the designated bridge and the port through which the bridge is communicating with the root bridge is referred to as the root port If redundant paths exist the bridges that are a part of the paths must determine which path will be the primary active path and which path s will be placed in the standby blocking mode This is accomplished by an determination of path costs The path offering the lowest cost to the root bridge becomes the primary path and all other redundant paths are placed into blocking state Path cost is determined through an evaluation of port costs Every port on 59 Chapter 7 Spanning Tree Protocol STP a bridge participating in STP has a cost associated with it The cost of a port on a bridge is typically based on port speed The faster the port the lower the port cost The exception to this is the ports on the root bridge where all ports have a port cost of 0 Path cost is simply the sum of the port costs between a bridge and the root bridge The AT GS950 8 WebSmart switch automatically sets the port cost according to the speed of the port assigning a lower value for higher speeds
44. sm is called scheduling Scheduling determines the order in which a port handles the packets in its egress queues The AT S82 management software uses weighted round robin scheduling This method functions as its name implies The port transmits a set number of packets from each queue in a round robin fashion so that each queue has an opportunity to transmit traffic This method guarantees that every queue receives some attention from the port for transmitting packets To set up scheduling you need to specify the maximum number of packets a port should transmit from a queue before moving to the next queue This is referred to as specifying the weight of a queue In all likelihood you will want to give greater weight to the packets in the higher priority queues over the lower queues Table 2 provides a scheduling 51 Chapter 6 Class of Service example Table 2 Scheduling Example Port Egress Queue Maximum Number of Packets QO 1 Q1 5 Q2 15 Q3 25 In this example the port transmits a maximum of 25 packets from Q3 then 15 packets from Q2 and so forth 52 AT S82 Management Software User s Guide Mapping Priorities to Queues To map priorities to queues perform the following procedure 1 From the main menu select CoS Priority to Queue The CoS Priority to Queue page is shown in Figure 21 CoS Priority to Queue Prierity 2 Queue 0 v Prierity 4 Queue 2 Priority 5 Q
45. ss Queues When the egress queues on a port in an Ethernet switch contains more packets than the port can handle in a timely manner the port may be forced to delay the transmission of some packets A port may be forced to delay transmission of packets while it handles other traffic and in some situations some packets destined to be forwarded from the port are discarded Minor delays are often of no consequence to a network or its performance But there are applications referred to as delay or time sensitive that can be impacted by packet delays Voice transmission and video conferencing are two examples If packets containing data for either of these applications are delayed in reaching their destination the audio or video quality may suffer CoS allows you to manage the flow of traffic through a switch by setting the switch ports to give higher priority to some packets such as delay sensitive traffic over other packets This is referred to as prioritizing traffic CoS applies primarily to tagged packets A tagged packet contains information that specifies the VLAN to which the packet belongs and can also contain a priority level Network switches and other networking devices use the priority level to determine how important that packet is compared to other packets High priority packets are handled before low priority packets CoS as defined in the IEEE 802 1p standard has eight levels of priority 0 to 7 with O the lowest priori
46. ssesseenn menn 62 Point to Point and Edge Ports 0 1 cccccccecccecseseccceeeteeseceeeeeseceaceeesenaeceeeesadaeeneesecsaceseneaddeceeseeeseceneteedaes 63 Spanning Tree and VEAN Sicuani iii tbe adie eee 65 Configuring Spanning Tree icc niii de dd dede eei a dE dee Uv a da eR Lo aa suo nna Pau n n Rand uas 67 Configuring S TP Port Settirigs i edu reed ic id adic risa Ee teu Ett enu thie its 70 Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 Figure 29 LOGIN DIAlOG BOX RE ORE T ade 12 Maim Page P C 13 save Configuration Page 0 Gg eite ada 14 Basic Switch Information Page 1 reinen e tdi 18 Administrator Password Page iini eterne teen intet geni een 22 Reboot Page li acid 23 Reset Page nani ati lle 24 Reset System Page iii ea 25 Download Firmware M 26 Download Status Message monning aioin devino 26 Port Configuration Page ta A MT ade tat ocean 28 Trunking Algorithm Page iii dia piedad 34 Port Trunking Page nr eere PEE tia nase 35 Port Trunking Configuration Page 3 9 2
47. subnet mask and gateway address to the switch To set the switch s IP configuration perform the following procedure 1 From the main menu select Basic Switch Information The Basic Switch Information page is shown in Figure 4 Basic Switch Information Build 1 01 B04 Build 1 01 B47 00 00 01 02 03 04 00 Manual 149 35 8 241 Subnet Mask 255 255 255 0 0 0 0 0 default 802 1q it Ping Blecking Enabled Disabled IE JHEHHHHBEHBE e 21215 AE CARACAS 152315 JHAHE F ALIFE E E E EJE a 5 E Apply Figure 4 Basic Switch Information Page 2 To set the switch s IP address in the Get IP Address field choose one of the following from the list Manual Allows you to enter static IP address information a In the IP Address field enter the IP address The default is 192 168 1 1 b In the Subnet Mask field type the subnet mask for the switch The default is 255 255 255 0 c In the Default Gateway field type the IP address of the default gateway There is no default gateway assigned AT S82 Management Software User s Guide BOOTP Enables BOOTP so that the switch gets its IP address from a BOOTP server When you choose this selection the IP Address Subnet Mask and Default Gateway fields are not available DHCP Enables DHCP so that the switch gets its IP address from a DHCP server When you choose this selection the IP Address Subnet Mask and Default Gateway fields are not
48. t www alliedtelesis com You can view the documents online or download them onto a local workstation or server AT S84 Management Software User s Guide Contacting Allied Telesis Online Support Email and Telephone Support Returning Products Sales or Corporate Information Management Software Updates This section provides Allied Telesis contact information for technical support as well as sales and corporate information You can request technical support online by accessing the Allied Telesis Knowledge Base http kb alliedtelesis com You can use the Knowledge Base to submit questions to our technical support staff and review answers to previously asked questions For Technical Support via email or telephone refer to the Support amp Services section of the Allied Telesis web site www alliedtelesis com Products for return or repair must first be assigned a return materials authorization RMA number A product sent to Allied Telesis without an RMA number will be returned to the sender at the sender s expense To obtain an RMA number contact Allied Telesis Technical Support through our web site www alliedtelesis com You can contact Allied Telesis for sales or corporate information through our web site www alliedtelesis com To find the contact information for your country select Contact Us gt Worldwide Contacts New releases of management software for our managed products are available from either of th
49. t Priority a con AA BW N e X E E FO TEES REO A DEZ Figure 23 CoS Port Priority Assignment Page Choose the port you want to set using the From and To lists You can select one port From 2 To 2 for example or a range of ports From 1 To 5 for example To set the priority of the port choose a priority from the Priority list Click Apply to implement your changes To save the settings to the configuration file from the main menu select Save Configuration The Save Configuration page is shown in Figure 3 on page 14 Click Apply 55 Chapter 6 Class of Service 56 Chapter 7 Spanning Tree Protocol STP This chapter contains the following sections O Spanning Tree Overview on page 58 a Configuring Spanning Tree on page 67 a Configuring STP Port Settings on page 70 Section I Using the Menus Interface 57 Chapter 7 Spanning Tree Protocol STP Spanning Tree Overview 58 Bridge Priority and the Root Bridge The performance of a Ethernet network can be negatively impacted by the formation of a data loop in the network topology A data loop exists when two or more nodes on a network can transmit data to each other over more than one data path The problem that data loops pose is that data packets can become caught in repeating cycles referred to as broadcast storms that needlessly consume network bandwidth and can significantly reduce network performance The Spanning Tree
50. topology information to the other network bridges and is used by the other bridges to determine if there are redundant paths in the network A root bridge is selected by the bridge priority number also referred to as the bridge identifier and sometimes the bridge s MAC address The bridge with the lowest bridge priority number in the network is selected as the root bridge If two or more bridges have the same bridge priority number of those bridges the one with the lowest MAC address is designated as the root bridge AT S82 Management Software User s Guide You can change the bridge priority number in the AT S82 management software You can designate which switch on your network you want as the root bridge by giving it the lowest bridge priority number You might also consider which bridge should function as the backup root bridge in the event you need to take the primary root bridge offline and assign that bridge the second lowest bridge identifier number The bridge priority has a range 0 to 61440 in increments of 4096 To make this easier for you the AT 882 management software divides the range into increments The valid range is of sixteen increments is shown in Table 3 Table 3 Bridge Priority Value Increments Increment S Increment xd 0 0 8 32768 1 4096 9 36864 2 8192 10 40960 3 12288 11 45056 4 16384 12 49152 5 20480 13 53248 6 24576 14 57344 7 28672 15 61440 Path Costs and Port Cost
51. ty and 7 the highest Each port has four egress queues labeled Q0 Q1 Q2 and Q3 QO is the lowest priority queue and Q3 is the highest A packet in a high priority egress queue is typically transmitted out a port sooner than a packet in a low priority queue Scheduling AT S82 Management Software User s Guide Table 1 lists the mappings between the eight CoS priority levels and the four egress queues of a switch port Table 1 Default Mappings of IEEE 802 1p Priority Levels to Priority Queues IEEE 802 1p Priority Level Port Priority Queue 0 Q1 1 QO QO Q1 Q2 Q2 Q3 Q3 NIL OO ao AJ OJN For example if a tagged packet with a priority level of 2 entered a port on the switch the switch would store the packet in Q11 on the egress port Note that priority 0 is mapped to CoS queue 1 instead of CoS queue 0 because tagged traffic that has never been prioritized has a VLAN tag user priority of 0 If priority O was mapped to CoS queue 0 this default traffic goes to the lowest queue which is probably undesirable A switch port needs a mechanism for knowing the order in which it should handle the packets in its four egress queues For example if all the queues contain packets should the port transmit all packets from Q3 the highest priority queue before moving on to the other queues Or should it instead just send a few packets from each queue and if so how many This control mechani
52. ueue 2 Priority 7 Queue 3 Apply Figure 21 CoS Priority to Queue Page The default queue for each priority is displayed To set the queue associated with a priority select a new queue from the adjacent list Click Apply to implement your changes To save the settings to the configuration file from the main menu select Save Configuration The Save Configuration page is shown in Figure 3 on page 14 Click Apply 53 Chapter 6 Class of Service Setting Up the Schedule To configure map ports to priority queues perform the following procedure 1 From the main menu select CoS Output Scheduling The CoS Output Scheduling page is shown in Figure 21 CoS Output Scheduling Figure 22 Output Scheduling Page 2 To set the weight for a queue go to that queue and type a number 3 Click Apply to implement your changes 4 To save the settings to the configuration file from the main menu select Save Configuration The Save Configuration page is shown in Figure 3 on page 14 5 Click Apply 54 AT S82 Management Software User s Guide Assigning Priority to Ports To assign a priority to a specific port perform the following procedure 1 From the main menu select CoS Port Priority Assignment The CoS Port Priority Assignment page is shown in Figure 23 CoS Port Priority Assignment a D Port 1 Port 1 vw o lt Port Priority Table or
53. x mode at a speed of 1000Mbps you can configure the ports for Forced mode To do this you configure the switch port to be the master port capable of sending detect and negotiate signals and the end node as a slave port capable of receiving negotiate signals Note You cannot modify the speed or duplex mode of the SFP ports 29 Chapter 3 Port Configuration 30 10M Half 10Mbps half duplex 10M Full 10Mbps full duplex 100M Half 100Mbps half duplex 100M Full 100Mbps full duplex 1000M Full 1000Mbps full duplex 1000M_M Full 1000Mbps full duplex for port operating as a Master port at 1000Mbps in Force mode This allows the port to send detect and negotiate signals o2 uuuuiu oO 1000M S Full 1000Mbps full duplex for port operating as a Slave port at 1000Mbps in Force mode This allows the port to receive negotiate signals To enable or disable flow control on the port choose the port using the From and To lists You can select one port From 2 To 2 for example or a range of ports From 1 To 5 for example From the Flow Control list choose one of the following Enabled Flow control is enabled Disabled Flow control is disabled This is the default From the Medium Type list choose one of the following Note This setting applies only to the SFP ports ports 7 and 8 shown as ports 7F and 8F in the Port Configuration page Copper Copper SFP Fiber Fiber SFP Click
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