Chapter 4 Configuring the Switch
Contents
1. e Bridge Priority The priority value of this switch After exchanging BPDUs with other STP enabled devices the device with the lowest priority value becomes the root bridge e Bridge Max Age The maximum age of the current bridge This is the maximum age of the Spanning Tree Protocol information learned from the network before it is discarded in seconds e Bridge Hello Time Indicates the amount of time in seconds that the switch waits before sending configuration PDUs when it is the root of the spanning tree or trying to become the root Bridge Forward Delay Indicates the amount of time measured in seconds that the port stays in each of the listening and learning states that precedes the forward state This value is also used to age all dynamic entries in the forwarding databases when a topology change has been detected and is underway The IEE 802 1W RSTP Setting page of the GS748T switch contains a set of default values which are optimal for most applications Adjust these values if you must provide for special conditions To set up RSTP 1 Select Switching gt STP gt Advanced gt RSTP Configuration from the main menu The RSTP Configuration screen will display 2 Select the Enable radio box for RSTP Configuration and click Apply 3 Then select the Advanced link to display the Bridge Settings You can accept the default settings or modify the default settings and click Apply Switching Security M2. 4 20 Configuring the Switch v1 0 October 2007 Smart Switch Software User Manual GS748T The Storm Control Settings table contains system wide configuration parameters for storm control To configure storm control 1 Select Security gt Traffic Control The Storm Control screen will display System Switching QoS Security Monitoring Maintenance Help Management Security on Access l Storm Control Storm Control Storm Control Settings co Port Settings GO TO INTERFACE kaso gi Disable g2 Disable g3 Disable od Di ble Hoo ai i Figure 4 22 2 From the Ingress Control Mode pull down menu select the type of the packet storm e Disable to turn off storm control e Unknown Unicast Multicast and Broadcast e Multicast and Broadcast e Broadcast Only 3 In the Threshold field specify the threshold rate limit packets per seconds for storm control The valid range is from 1000 to 65535 4 Click Apply You must enable the Storm Control feature on each port individually from the Port Settings table Storm Control is disabled on every port by default To enable Storm Control 1 Select Security gt Traffic Control The Storm Control screen will display 2 Select the checkbox adjacent to the port that you want to change Configuring the Switch 4 21 v1 0 October 2007 Smart Switch Software User Manual GS748T 3 In the top row from the Status pull down menu s
3. Port 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 UU UU UU UU obo ob uo a ul U UU UU U Figure 4 12 Note Every port has an initial default VID of 1 PVID 1 Whether a port has this VID or has been made a member of another default VID you cannot remove any port from its prior default VLAN until you have reassigned its PVID to its new value Use the PVID Setting menu option of VLAN Management to change its PVID before attempting to remove it from its prior default membership The PVID Configuration table contains parameters for assigning Port VLAN ID PVID values to interfaces All ports must have a defined PVID If no other value is specified the default VLAN PVID is used If you want to change the port s default PVID you must first create a VLAN group that includes the port To modify a PVID 1 Select the interface or port that you want to modify 2 Inthe PVID field enter a valid VLAN ID Configuring the Switch 4 9 v1 0 October 2007 Smart Switch Software User Manual GS748T 3 Click Apply Switching QoS Security Monitoring Maintenance Help Ports LAG LAr STP Multicast Switch Configuration gt LAN Port P VID Configuration Configuration gt VLAN Membership PVID Configuration Port PVID GOTOINTERFACE so owen O S E at 1 E 1 ia Sa 94 1 C os 1 Figure 4 13 Configuring Port Based VLANs Unlike 802 1Q based VLAN an i
4. by port Summary Statistics All ports Tx and Rx statistics summarized Presents the information from each port s internal counters To view statistics for a single port 1 From the Port pull down menu select the port number 2 Click Apply To retrieve summary statistics 1 Click Refresh to retrieve the current count from the device and update the tables 2 Click Clear Counters to reset all counters to zero 4 24 v1 0 October 2007 Configuring the Switch Smart Switch Software User Manual GS748T Port Statistics Port Statistics Port Selection Port Statistics ee Bytes 0 Bytes 0 UnicastPkts 0 UnicastPkts 0 CarrierSenseErrors 0 DropPkts 0 MulticastPkts 0 MulticastPkts 0 PausePkts 0 PausePkts 0 BroadcastPkts 0 BroadcastPkts 0 FrameInDisc 0 ExcessSizeDisc 0 DeferredTransmit 0 UnderSizePkts o Collision 0 OverSizePkts 0 ExcessiveCollision 0 Jabbers it Fragments 0 FCSErrors 0 64 BytePkts 0 65 to 127 BytePkts 0 128 to 255 BytePkts 0 256 to 511 BytePkts 0 12 to 1023 BytePkts 0 1024 to 1518 BytePkts 0 Summary Statistics e a E Packets Packets Packets Packets 1 0 0 0 0 0 0 2 346 0 0 0 0 0 Figure 4 24 Configuring the Switch 4 25 v1 0 October 2007 Smart Switch Software User Manual GS748T 4 26 Configuring the Switch v1 0 October 2007
5. 101111 52 110100 57 111001 61 111101 o ov 2 000010 6 000110 13 001101 21 010101 29 011101 37 100101 43 101011 49 110001 53 110101 58 111010 62 111110 0 fow AF 31 011010 AF 32 011100 AF 33 011110 ow ow om 3 000011 7 000111 15 001111 23 010111 31 011111 39 100111 44 101100 50 110010 54 110110 59 111011 63 111111 AF 41 100010 AF 42 100100 AF 43 100110 4 000100 9 001001 17 010001 25 011001 33 100001 41 101001 45 101101 51 110011 55 110111 60 111100 Priority Priority Figure 4 21 Enabling Storm Control The Storm Control feature enables you to prevent network performance from being disrupted by specifying the threshold of ingress broadcast or multicast and broadcast packets on each port The traffic source may be Multicast and Broadcast Broadcast only or Unknown Unicast Multicast or Broadcast or it may be disabled A selected received threshold rate of between 1000 and 65535 packets per second may be specified in each case If Multicast and Broadcast is selected as the source of the traffic then the threshold value is the combined rate of both types of packet If the incoming traffic rate of the specified packet types is above the specified value the packets are discarded
6. Ingress and egress rates are separately configurable To configure the rate limit for a specific port 1 Select QoS gt Basic gt Rate Limit The Rate Limit Rate Control Setting screen will display 2 Select the checkbox adjacent to the port you want to configure 3 In the top row select the rate limitations from the pull down menus e Inthe Ingress Rate list select the rate limitation of incoming traffic in this port e Inthe Egress Rate list select the rate limitation of outgoing traffic in this port 4 Click Apply System Switching Security Monitoring Maintenance Help T Basit Rate Limit QoS Global z SEA Rate Control Setting Rate Limit GO TO INTERFACE Go gt Advanced Port nares Rate Egress Rate CONE m I co F gi 1000M bps 1000M bps O g2 1000M bps 1000M bps F g3 1000M bps 1000M bps O g4 1000M bps 1000M bps O 5 1000M bps 1000M bps C g6 1000M bps 1000M bps Figure 4 19 Setting QoS Global Configuration Quality of Service QoS is used to manage traffic in a network by treating different types of traffic with different levels of priority Higher priority traffic receives preferential treatment during times of switch congestion 1 Egress rate limiting is available only with v3 hardware Configuring the Switch 4 17 v1 0 October 2007 Smart Switch Software User Manual GS748T Two possible system mode implementations of QoS are supported e IEEE 802 1p based Q
7. Port 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 ECAC Pee E C E E S S SC E C O O S E Port 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Hi EE RS PPR RP RRR ERR Ree eae Figure 4 18 To remove a multicast group 1 In the line of the table that specifies the group check the Delete box 2 Click Apply to remove the group Enabling Jumbo Frames Jumbo Frames are not an approved standard Ethernet frame size so you must ensure that all of your networking equipment can support these nonstandard jumbo frames to prevent them from being dropped The Jumbo Frame screen allows you to enable or disable jumbo frame support The maximum default frame size is 1 518 bytes When jumbo frame support is enabled the frame size can vary from 64 bytes to 9 216 bytes Jumbo frames is disabled by default To configure a jumbo frame 1 Select Switching gt Switch Configuration from the main menu The Jumbo Frame Configuration will display 2 Inthe Jumbo Frame radio box select Enable Click Apply 4 16 Configuring the Switch v1 0 October 2007 Smart Switch Software User Manual GS748T Setting Rate Limits Rate Limiting determines the bandwidth of ingress and egress traffic for a specific port There are 11 data rate options in the range 512K bps to 1000M bps including a disable option that applies no limit to the data rate
8. These settings determine if packets transmitted from each port are tagged with the VLAN ID and other information By default every port is a member of VLAN 1 which has a port VLAN ID PVID of 1 To modify 802 1Q VLAN membership 1 Select Switching gt VLAN gt VLAN Membership from the main menu The VLAN Membership screen will display 2 Inthe VLAN Identifier list select the VLAN that you want to modify The possible operations are e Untag All Add all the ports to this VLAN and remove tag on all egress packets 4 8 Configuring the Switch v1 0 October 2007 Smart Switch Software User Manual GS748T e Tag All Add all the ports to this VLAN and tag all egress packets e Remove All Remove all the ports from this VLAN Click the Unit link to display all available ports Toggle the check box for each port to change its membership and tag setting e An empty check box indicates that the port is not a member of this VLAN e T indicates that the egress packet is tagged e U indicates that the egress packet is untagged Click Apply Switching Security Ports LAG LAt STP Multicast Switch Configuration Monitoring Maintenance Help gt VLAN VLAN Membership Configuration n VLAN Membership VLAN Membership 9 gt Port P ID VLAN Identifier configuration POA o a Port 01 02 3 4 5 2 eX 06 07 08 09 10 12 13 14 15 16 18 19 20 21 22 23 24 uuuuuuuvuuuvuvuuuuuu uuuuuuu
9. span multiple switches VLAN port membership is determined via a lookup table that you set up when you configure the switch You can create up to 48 port based VLANS Every port belongs to VLAN ID 1 by default Configuring the Switch 4 7 v1 0 October 2007 Smart Switch Software User Manual GS748T Adding and Configuring IEEE 802 1Q VLAN Groups Depending on the VLAN type selected in the VLAN Type Configuration table you can create 256 IEEE 802 1Q based VLANs or 48 port based VLANs To create a VLAN 1 Select Switching gt VLAN gt VLAN Configuration from the main menu The VLAN Configuration screen will display 2 Select the IEEE 802 1Q radio box and click Apply Switchin Securit Monitorin Maintenance Hel 9 y g P STP Multicast Switch Configuration VLAN VLAN Configuration Configuration gt LAN Membership VLAN Type Configuration gt Port PYID VLAN Type IEEE 802 19 O Port Based Configuration VLAN Configuration LAN ID LAN Name Figure 4 11 3 Inthe VLAN ID field specify a VLAN ID from 1 to 4094 This field is available only when the 802 1Q VLAN type is selected If you have not previously created a VLAN this window shows VLAN ID 1 default with all ports set Untagged 4 Inthe VLAN Name field assign a name to help you to identify this VLAN 5 Click Add Use the VLAN Membership table to manage each port s VLAN membership for transmitting packets
10. AN mode is used e Multicast Entry Specifies the multicast group MAC address associated with the VLAN Click Add Ports LAG VLAN STP ulticast Switch Configuration Security Monitoring Maintenance Help Multicast Group Configuration Static Multicasting kt reser Membership Bl 1 01 00 5E 01 01 02 Figure 4 17 To delete a static multicast entry 1 Select the checkbox adjacent to the multicast group you want to delete 2 Click Delete Multicast Group Membership The Multicast Group Membership table displays the ports associated with each multicast group To configure the multicast group membership 1 Select Switching gt Multicast gt Advanced gt Multicast Group Membership The Multicast Group Membership screen will display From the ID pull down menu select a multicast group that you created in the Multicast Group Configuration screen Click the Unit 1 link All the available ports will display Select the ports for the Multicast Group Select the Unit 1 checkbox to select all ports Click Apply Configuring the Switch 4 15 v1 0 October 2007 Smart Switch Software User Manual GS748T Security Monitoring Maintenance Help Ports LAG VLAN STP Multicas Switch Configuration gt Basic Multicast Group Membership v Advanced Multicast Group Configuration viani gt s Multicast Group Membership Multicast Group Membership D
11. Chapter 4 Configuring the Switch The navigation tabs across the top of the user interface provide access to all of the submenu screens which allow you to manage your GS748T Smart Switch The features under the following main headings Configuring Ports Configuring the Link Aggregation Group LAG Setting Up SNMP Configuring and Creating VLANs Enabling Spanning Tree Protocol Establishing Multicast Groups Enabling Jumbo Frames Setting Rate Limits Setting QoS Global Configuration Enabling Storm Control Configuring the IP Access List Controlling Switch Access by MAC Address and VLAN ID Setting up Mirroring or Sniffer Ports Viewing Packet Statistics The description that follows in this chapter covers these features and tells you how to configure them in the GS748T switch Configuring Ports The Port Configuration table displays the port status and contains fields for defining port parameters To configure port settings 1 Select Switching gt Ports from the main menu The Port Configuration screen will display 4 1 v1 0 October 2007 Smart Switch Software User Manual GS748T 2 Select the row of the port that you want to configure Then at the top of screen enter the following information for the selected port e Type a description for the port in the Port Description field e From the Port Speed pull down menu select t
12. avior PHB priorities by selecting a QoS service class value of between 0 and 7 Packets within these service classes are treated with equal priority e RFC 2597 defines the assured forwarding AF PHB It guarantees a certain amount of bandwidth to an AF class e The Expedited Forwarding EF PHB is defined in RFC 2598 and uses Codepoint 101110 The EF PHB is used to build a low loss low latency low jitter assured bandwidth service This premium service can appear to the user be a point to point connection 3 Click Apply Configuring the Switch 4 19 v1 0 October 2007 Smart Switch Software User Manual GS748T gt Basic v Advanced 802 1p to Queue Mapping DSCP Priority Mapping DSCP to Priority Mapping DSCP to Priority Mapping Class Selector CS PHB csi 900000 css 100000 Assured Forwai ov ov cs2 001000 cs 6 101000 ding AF PHB 0 m ov cs3 010000 cs7 i 110000 o isa o w cS 4 011000 cse 111000 Losce Priority psce Priority oscp Priority oscp AF 11 001010 AF 12 001100 AF 13 001110 ov ov oy AF 21 010010 AF 22 010100 AF 23 010110 Expedited Forwarding EF PHB DSCP Priority EF 101110 ov ov low Other DSCP Values Local Experimental Use psc pscP 1 000001 5 000101 11 001011 19 010011 27 011011 35 100011 42 101010 47
13. based on their content To receive messages the switch must be configured to use IGMP snooping in subnets that receive IGMP queries from either IGMP groups or the IGMP snooping querier IGMP snooping constrains multicast traffic at Layer 2 by dynamically configuring Layer 2 LAN ports to forward multicast traffic only to those ports that want to receive the messages IGMP is a standard defined in RFC 1112 for IGMPv1 and in RFC 2236 for IGMPv2 Both IGMP Snooping and blocking of unknown multicast addresses flooding are disabled by default To enable IGMP snooping 1 Select Switching gt Multicast gt Basic from the main menu The IGMP Snooping screen will display 2 Select the Enable radio box to enable the IGMP Snooping Status feature 3 Select the Enable radio box for Block Unknown Multicast Addresses to allow unknown multicast flooding 4 Click Apply Multicast Group Configuration The Static Multicast table allows you to add and delete static multicast groups Up to 256 static multicast groups can be supported To add a static multicast entry 1 1 Select Switching gt Multicast gt Advanced gt Multicast group Configuration The Multicast Group Configuration screen will display 2 Enter the following parameters for each field in the top row 4 14 Configuring the Switch v1 0 October 2007 Smart Switch Software User Manual GS748T e VLAN ID Specifies the VLAN ID This field is only applicable if 802 1Q VL
14. ch to generate the SNMP linkUp and linkDown trap when one of its ports changes its link status 7 From the Status pull down menu select Enable or Disable to specify the administration status A managed station or host is not active until it is set to Enable 8 Click Add to add a management station To delete a management station Select the entry you want to delete and click Delete To modify an entry 1 Select the checkbox by the entry you want to modify The fields available for modifying will appear at the top of the table 4 6 Configuring the Switch v1 0 October 2007 Smart Switch Software User Manual GS748T 2 Modify the settings in the top row and click Apply Configuring and Creating VLANs A Virtual Local Area Network VLAN is a means of electronically separating ports on the same switch from a single broadcast domain into separate broadcast domains By using VLANs users can group nodes by logical function instead of physical location For example Engineering and Accounting department traffic can be separated from one another VLAN memberships are manipulated by associating switch ports with VLAN IDs VIDs You can choose from two types of VLAN to set up on the switch IEEE 802 1Q VLAN Tagged VLAN or Port based VLAN You cannot mix the types on the same switch In either case any port can be a member of multiple VLANs IEEE 802 1Q VLAN The VLAN tagging option is a standard set by the IEEE to facilitate
15. elect either Enable or Disable 4 Click Apply Configuring the IP Access List The IP Access List table allows you to limit and specify the IP addresses that can access the management portion of the switch An empty list means that all IP addresses are allowed to access the switch Otherwise the switch will respond only to requests from computers with an IP address in the list So make sure that you include the IP address of your PC if you are setting this feature The list can have a maximum of 10 IP addresses To add an entry to the IP Access list 1 Select Security gt Access gt IP Access List from the main menu The IP Access List will display 2 Inthe IP Address field of the configuration row enter the IP address of the PC that you want to manage the switch from 3 Click Add To delete an entry from the IP Access list 1 Select the checkbox adjacent to the entry of the IP address you want to remove 2 Click Delete Controlling Switch Access by MAC Address and VLAN ID The Trusted MAC table shows all the Trusted MAC addresses that you can specify to allow forwarded traffic to the switch The maximum number of trusted MAC addresses is 256 per system All source MACs are trusted when the Trusted MAC list is empty If the list includes MAC addresses any incoming traffic with a source MAC address that is not included in the trusted MAC table is dropped If the VLAN mode for the switch is set up as Port based you ente
16. he rate for the port 100M 100 Mbps 10M 10 Mbps Auto Auto will set the speed to 1000Mbps Disable disable the port 3 From the Duplex Mode pull down menu select the duplex mode for the port this field is available only when auto negotiation is disabled and the port speed is set to 10M or 100M e Full Full duplex e Half Half duplex 4 From the Flow Control pull down menu select whether or not to enable or disable Flow Control 5 From the Default Priority pull down menu assign a default packet priority for packets without IEEE802 1P tagging If the packet comes in with a priority tag the priority is retrieved from priority field of the tag 6 Click Apply 4 2 Configuring the Switch v1 0 October 2007 Smart Switch Software User Manual GS748T System Switching QoS Security Monitoring Maintenance Help LAG VLAN STP Multicast Switch Configuration Y Port Configuration Port Configuration Port Configuration GOTO INTERFACE GO Link Port Duplex Flow Default Interf Port D ti iM TANA a CE ETD Status Speed Mode Control Priority on E oo ER allied Lull ad EnEDIC x eree vo va o Oe Down Auto Enable 0 B Down Auto Full Enable 0 E o3 Down Auto Full Enable o g4 Down Auto Full Enable 0 O a5 Down Auto Ful Enable 0 O g Down Auto Full Enable 0 Ei g7 Down Auto Full Enable 0 g8 Down Auto Full Enable o g9 Down Auto Ful Enable 0 gio Down A
17. m the Destination Port pull down menu select a port to be the destination port All mirrored traffic will be routed to this port 3 From the Mirroring pull down menu select the mirroring mode The possible settings are e Tx and Rx Mirrors both incoming and outgoing traffic on the designated source ports e Rx Only Mirrors only the incoming traffic to the designated source ports e Tx Only Mirrors only the outgoing traffic to the designated source ports e Disable Disables port mirroring globally 4 Select the Source Port check boxes for the ports to be mirrored Clear the check boxes for the ports you do not want to be mirrored 5 Click Add Configuring the Switch 4 23 v1 0 October 2007 Smart Switch Software User Manual GS748T System Switching Security Monitoring Maintenance Help Port Mirroring Port Mirroring Configuration Destination Port Mirroring Disable Vv Port 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 ERR BR RR RRB RRR RRR eee Port 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 DOOOOOOOOOOOOOOOOOOOOOOO00 Figure 4 23 Viewing Packet Statistics The Port Statistics screen shows reports of packet traffic and packet errors formatted as follows Port Selection The port number on the switch selected from the Port pull down menu Statistics Detailed Tx and Rx statistical information
18. ngress packet with an 802 1Q tag is ignored and preserved To modify port based VLAN membership 1 Select Switching gt VLAN gt VLAN Configuration from the main menu The VLAN Configuration screen will display Switching QoS Security Monitoring Maintenance Help Ports LAG L STP Multicast Switch Configuration X VLAN VLAN Configuration Configuration n LAN Membership VLAN Type Configuration VLAN Type IEEE 802 19 Port Based VLAN Configuration a fveanname OE Fi i VLANL Figure 4 14 Ensure that the Port Based radio box has been enabled for VLAN Type In the VLAN Name field assign a name to help you to identify this VLAN Click Add 4 10 Configuring the Switch v1 0 October 2007 Smart Switch Software User Manual GS748T To modify a Port Based VLAN membership 1 Select VLAN Membership The VLAN Membership screen will display all port based VLAN members 2 From the VLAN Identifier pull down menu select the VLAN that you want to modify You can also click the Unit link to display all available ports 3 Select or clear the check box for the port for the VLAN 4 Click Apply To delete a VLAN Select the VLAN you want to remove and click Delete all port associations are separated from the VLAN and it is removed Selecting a Management VLAN The Management VLAN allows you to establish an IP connection to the switch from a PC connected to a port in that VLAN This increases securit
19. oS e DSCP based Differentiated Services Code Point QoS To specify the QoS Global system mode 1 Select QoS gt Basic gt QoS Global Configuration from the main menu The QoS Global Configuration screen will display 2 Select either the 802 1p Based radio box or the DSCP Based radio box 3 Click Apply IEEE 802 1p Based QoS IEEE 802 1p based QoS enables the user to map each of the eight priority levels specified in IEEE 802 1p p0 to p7 to one of four internal hardware priority queues High Normal Low and Lowest The eight priority levels specified in IEEE 802 1p p0 to p7 are implemented by a three bit priority field in the VLAN tag The switch empties the four hardware priority queues in order from High to Lowest Packets are transferred to empty the buffers of each higher hardware priority queue in turn before the next lower hardware priority queue can begin to transfer its received packets through the switch The 802 1p to Queue Mapping table contains fields for mapping 802 1p priority values to the four hardware traffic queues To map 802 1p priorities to queues 1 Select QoS gt Advanced gt 802 1p Queue Mapping The 802 1p to Queue Mapping screen will display System Switching QoS Securit Monitorin Maintenance Hel yY g P gt Basic 802 1p to Queue Mapping y Advanced 8021p to Queue 802 1p to Queue Mapping 802 1 802 1 802 1 802 1 sea alee ee i Naa Tez om DSCP Priority Priority ri
20. onitoring Maintenance Help Ports LAG VLAN STP Multicast Switch Configuration gt Basic RSTP Configuration y Advanced A RETE RSTP Configuration Configuration RSTP Configuration ODisable Enable Port Configuration Bridge Settings Bridge Priority 32768 Bridge Max Age 20 e 0 Bridge Hello Time 2 1 10 Default 2 Bridge Forward Delay 4 30 Default 15 Figure 4 15 4 12 Configuring the Switch v1 0 October 2007 Smart Switch Software User Manual GS748T The Port Configuration table displays the current status of individual ports You can also configure ports from this table To modify port settings 1 2 3 Select the Port Configuration link The RSTP Port Configuration screen will display Select the interface or port you want to modify Modify the settings in the top row e Path Cost Displays the cost of this port Cost means the contribution of this port to the cost of paths toward the spanning tree root that include this port The switch uses this value to determine which port is the forwarding port If all other factors are equal the path with the lowest cost to the root bridge is the active path e Priority Displays the priority of this port This is the value of the priority field contained in the first octet of the port ID The port with the lowest number has the highest priority e Edge Indicates if this port is the edge port Once configured as an edge por
21. ority Priority Priority Mapping o Lowest i Lowest 2 Low i Normal v 5 rmal v 6 High Ss F High H Figure 4 20 4 18 Configuring the Switch v1 0 October 2007 Smart Switch Software User Manual GS748T 2 From each 802 1p priority value pull down menu select one of the four hardware priority queues 3 Click Apply Differentiated Services Code Point DSCP based QoS The DSCP 6 bit field in an IP packet header enables levels of service to be assigned to network traffic according to the field s binary value This 6 bit field comprises three IP Precedence MSBs with a least significant 3 bit expansion field as defined in RFC 2474 The IP Precedence bits in the DSCP field are compatible with routers that only support IP Precedence DSCPs specifically tailored to be backward compatible with routers that only support IP precedence lack the 3 bit expansion field and are called Class selector DSCPs The DSCP to Priority Mapping table contains fields for mapping DSCP values to the eight 802 1p priority values For the DSCP QoS to work properly make sure that the priority values are correctly mapped to the appropriate hardware queues To map DSCP values to 802 1p priorities 1 Select QoS gt Advanced gt DSCP Priority Mapping from the main menu The DSCP to Priority Mapping screen will display 2 Select one of the eight priority values for each DSCP value e Match these DHCP values to set Per Hop Beh
22. protocol used for network management The protocol is used in communication between a Manager the management station and an agent within the managed device in this case your switch The Manager polls the agent which responds by returning data from the Management Information Bases MIBs that it maintains on the managed device to indicate its status An agent can return Traps to the Manager Traps are messages that alert the manager to conditions that may need attention Managers and Agents work within Communities which are defined to confine messaging within named groups An agent only responds to requests from Managers within its community The SNMP screen allows you to limit the IP addresses from which the switch MIBs can be accessed and to which IPs the switch sends SNMP traps The switch only responds to requests from management computers whose IP addresses are carried in the list This list also holds Privilege information that controls which IPs have read only or read write access You can also select the traps which the switch sends to the hosts from the following trap events The Status field must be set to Enable to allow management host communication Trap Events are indicated by e T1 Authentication fail The switch generates an SNMP trap when a host tries to gain access to the switch but the host s IP is not in the SNMP host table e T2 Device bootup The switch generates an SNMP trap when it reboots Configuring the Swi
23. r a MAC address and port number that you want to permit access this switch If the VLAN is set up in 802 1Q mode you enter a MAC address and VLAN ID to permit access To add a trusted MAC address 1 Select Security gt Access gt Trusted MAC The Trusted MAC screen will display 4 22 Configuring the Switch v1 0 October 2007 Smart Switch Software User Manual GS748T 2 Specify the trusted MAC address parameters in the configuration row Interface From the Interface pull down menu select the interface or port that you want to have this feature e MAC Address Specify the trusted source MAC address e VLAN ID Enter a VLAN ID that the interface belongs to if the 802 1Q VLAN mode is enabled 3 Click Add To delete a trusted MAC address 1 Select the checkbox adjacent to the trusted MAC entry that you want to delete from the list 2 Click Apply Setting up Mirroring or Sniffer Ports Port Mirroring allows you to configure traffic from any number of ports to be copied mirrored to your selected sniffer port which may be any port that is not a source port This traffic may be selected from transmitted or outgoing egress frames received or incoming ingress frames or all frames A port cannot be both a mirrored and a destination port at the same time Sniffing may be disabled globally To configure port mirroring 1 Select Monitoring gt Mirroring The Port Mirroring screen will display 2 Fro
24. t the port immediately transitions to the forwarding state e P2P Force Indicates if this port is a point to point link If you connect a port to another port though a point to point link and the local port becomes a designated port it negotiates a rapid transition with the other port to ensure a loop free topology Click Apply System Switching QoS Security Monitoring Maintenance Help Ports LAG VLAN STP Multicast Switch Configuration gt Basic Rapid Spanning Tree Port Configuration v Advanced RSTP Configuration GOTO INTERFACE laso _ Port rt Configuration P2P Interface Path Cost Priority State Force C I A Disable 128 Yes Yes Disable 128 Yes Yes Disable Disable 128 Yes Yes Disable 128 Yes Yes Disable Port Configuration D ge D R n o ES H N ao lt D a z ia KO Figure 4 16 Configuring the Switch 4 13 v1 0 October 2007 Smart Switch Software User Manual GS748T Establishing Multicast Groups You can specify specific ports and VLANs for receiving Multicast packets with specific MAC addresses The MAC addresses are IPv4 Multicast Addresses RFC 1112A formatted as 01 00 5E XX XX XX A maximum of 64 groups is supported IGMP Snooping IGMP Internet Group Management Protocol specifies how to register a host to a router in order to receive specific multicast traffic It allows your switch to examine IGMP packets and forward them in ways
25. tch 4 5 v1 0 October 2007 Smart Switch Software User Manual GS748T e T3 Link Up Down The switch generates an SNMP trap when one of its ports changes its link status You can specify the SNMP management station that can access the MIB of the switch and to which the switch will send the trap When adding a management station be aware that e You can specify up to four management station IP addresses e The switch will respond only to requests from a computer or management station with an IP address that is in the list e You can also select the traps that the switch will send to the hosts when the trap events you specify occur To add a management station 1 Select System gt SNMP The SNMP V1 V2 screen will display 2 In the Management Station field enter the IP address of the management station 3 In the Community String field specify the community string The switch processes requests from the management station only if the community string in the request packet matches the community string entered here 4 From the Access Mode pull down menu select the access privilege for the management station e Read Only for GET and GETNEXT requests e Read Write for GET GETNEXT and SET requests 5 From the Trap T2 pull down menu select Enable if you want the switch to generate the SNMP cold Start trap when it reboots otherwise select Disable 6 From the Trap T3 pull down menu select Enable if you want the swit
26. the spanning of VLANs across multiple switches Reference Appendix A and IEEE Std 802 1Q 1998 Virtual Bridged Local Area Networks This switch supports the creation of 256 Static Tag VLAN groups This implementation separates traffic by adding a VLAN tag into the appropriate egress frames packets from selected switch ports A receiving switch associates the tagged frame with the VLAN and forwards it according to its own VLAN to port lookup table to all ports on the VLAN except the ingress port In this way a VLAN structure may be built across a tree of switches You have the option of setting egress frames to be e Tagged This setting adds an 802 1Q tag into the frame leaving the selected port e Untagged This option strips the 802 1Q tags from frame leaving the selected port The port retains its association with the VLAN This facility is used when these ports are connected to downstream equipment that does not recognize and which consequently may be confused by 802 1Q tags e Unchanged This option is the default and signifies that the port is not associated with a VLAN Every port is a member of VLAN ID 1 by default You can change the default assignment of any port adjusting the Primary VLAN ID Setting PVID table Use this feature to ensure that untagged frames reach the VLAN that you require Port based VLAN This implementation confines VLAN members to the ports on the particular switch for example the VLANs cannot
27. uto Full Enable 0 gi2 Down Auto Full Enable 0 Figure 4 8 Configuring the Link Aggregation Group LAG Link Aggregation Groups otherwise known as Port Trunking enables multiple links between switches to work as one virtual link aggregate link to provide greater bandwidth than would be available by confining the traffic to a single port LAGs can be defined for similar port types only For example a 10 100 port cannot form a LAG with a gigabit port Up to 10 LAGs can be operating at the same time The LAG table displays the status and administration settings for all the available LAGs also known as trunks The GS748T Smart Switch supports 10 static LAGs To enable or disable a LAG 1 Select Switching gt LAG gt LAG Configuration from the main menu The LAG Configuration screen will display 2 Select the row of the LAG ID you want to enable or disable 3 From the Admin Mode pull down menu select Enable or Disable Configuring the Switch 4 3 v1 0 October 2007 Smart Switch Software User Manual GS748T 4 Click Apply System Switching QoS Security Monitoring Maintenance Help Ports LAG VLAN STP Multicast Switch Configuration LAG Configuration LAG Configuration gt LAG Membership aaoO LAG Configuration LAG ID Admin Mode LAG State li 01 Disable Down o 03 Disable Down C 04 Disable Down O os Disable Down Oo 06 Disable Down o 07 Disable Down O 08 Disable Down o 09 Disable Do
28. wn a 10 Disable Down Figure 4 9 The LAG Membership table displays the port members in each LAG You can also specify port members for LAGs When specifying LAGs the following policies apply e Each port can belong to only one LAG e Each LAG can have up to 8 ports e Ports ina LAG must have the same speed and be in the same VLAN group To configure port membership of a LAG 1 Select Switching gt LAG gt LAG Membership The LAG Membership screen will display 2 From the LAG ID pull down menu select the LAG that you want to modify 3 Click the Unit link next to the check box to display all available ports All ports are selected if the Unit checkbox is selected If not selected no ports are selected 4 Select or clear the check box for the ports you want to include or remove 5 Click Apply 4 4 Configuring the Switch v1 0 October 2007 Smart Switch Software User Manual GS748T Switching Security Monitoring Maintenance Help Ports LA VLAN STP Multicast Switch Configuration gt LAG Configuration LAG Membership LAG Membership j LAG Membership l 06 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 MUMUEMUM MMMM 30 3 35 36 37 38 39 40 41 42 43 44 45 46 47 48 v v v Figure 4 10 gt Note The selected LAG ID port must correspond to VLAN group IDs Setting Up SNMP SNMP Simple Network Management Protocol is a transport
29. y by allowing only PCs in the management VLAN to configure the switch Any VLAN can be designated as the management VLAN To configure the management VLAN 1 Select System gt Management gt IP Configuration The IP Configuration screen will display 2 Inthe Management VLAN ID field enter the ID of the VLAN that you want to use for managing the switch A zero value means that any PC in any of the VLANs can establish an IP connection to the switch 3 Click Apply to save your settings Enabling Spanning Tree Protocol To achieve reliability in a network some path redundancy must be provided However multiple paths between network nodes can cause loops to exist and result in switching confusion and duplication of traffic Spanning Tree Protocol defined by IEE 802 1D controls the duplicate paths by accounting for statistical weights in the available paths It blocks the least efficient alternate paths and causes traffic only to be carried over the optimal paths between nodes The GS748T switch supports Rapid Spanning Tree Protocol defined by IEEE 802 1w which is an improvement over the 802 1D STP that shortens connection latency between nodes The Configuring the Switch 4 11 v1 0 October 2007 Smart Switch Software User Manual GS748T resultant path between nodes determined by RSTP is the same as that eventually determined by STP Use the Bridge Settings table to manage attributes related to the Spanning Tree Protocol
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