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... Identifying a Layer 2 Path 20-11 Using IP Traceroute 20-12 Understanding How IP Traceroute Works 20-12 Executing IP Traceroute 20-12 Configuring CDP 21-1 Understanding How CDP Works 21-1 Default CDP Configuration 21-2 Configuring CDP on the Switch 21-2 Setting the CDP Global Enable State 21-2 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software...
... Identifying a Layer 2 Path 20-11 Using IP Traceroute 20-12 Understanding How IP Traceroute Works 20-12 Executing IP Traceroute 20-12 Configuring CDP 21-1 Understanding How CDP Works 21-1 Default CDP Configuration 21-2 Configuring CDP on the Switch 21-2 Setting the CDP Global Enable State 21-2 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software...
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... Setting the Supplicant-to-Host Retransmission Time for EAP-Request Frames 31-12 Setting the Back-End Authenticator-to-Authentication-Server Retransmission Time for Transport Layer Packets 31-13 Setting the Back-End Authenticator-to-Host Frame-Retransmission Number 31-13 Setting the Shutdown Timeout Period 31-13 Setting the Back...-14 Setting the Back-End Authenticator-to-Host Frame-Retransmission Number 31-14 Resetting the 802.1x Configuration Parameters to the Default Values 31-15 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 xix
... Setting the Supplicant-to-Host Retransmission Time for EAP-Request Frames 31-12 Setting the Back-End Authenticator-to-Authentication-Server Retransmission Time for Transport Layer Packets 31-13 Setting the Back-End Authenticator-to-Host Frame-Retransmission Number 31-13 Setting the Shutdown Timeout Period 31-13 Setting the Back...-14 Setting the Back-End Authenticator-to-Host Frame-Retransmission Number 31-14 Resetting the 802.1x Configuration Parameters to the Default Values 31-15 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 xix
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... debounce timer of the port is enabled on a port, perform this delay in loss of various Layer 2 and Layer 3 protocols. This situation might affect the convergence/reconvergence of a link down ; Console> (enable) Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 4-6 78-15486-01 Table 4-2 lists the time delay that occurs before the...
... debounce timer of the port is enabled on a port, perform this delay in loss of various Layer 2 and Layer 3 protocols. This situation might affect the convergence/reconvergence of a link down ; Console> (enable) Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 4-6 78-15486-01 Table 4-2 lists the time delay that occurs before the...
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...Cisco... switched LAN segment. • Any loops in the switched...switches...switched LAN segment • Alternate-A blocked port providing an alternate path to a single LAN segment or a switched LAN of the switches in a loopback configuration Switches...root switch from anywhere in the switched network...switch ports in the active topology. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 7-2 78-15486-01 Port roles are called root or designated switches...Is Created All switches in an extended ...information about other switches in the network...
...Cisco... switched LAN segment. • Any loops in the switched...switches...switched LAN segment • Alternate-A blocked port providing an alternate path to a single LAN segment or a switched LAN of the switches in a loopback configuration Switches...root switch from anywhere in the switched network...switch ports in the active topology. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 7-2 78-15486-01 Port roles are called root or designated switches...Is Created All switches in an extended ...information about other switches in the network...
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...the Layer 2 load-balancing benefits of PVST+ with that instance of your links will be used on all other switches in the network. Each MISTP instance has its own root switch and a different set of spanning tree (an MISTP instance). This process ensures that runs on Catalyst 4500 series switches. There...+ on your network currently uses PVST+ and you plan to all Ethernet, Fast Ethernet, and Gigabit Ethernet port-based VLANs on Catalyst 4500 series switches. therefore, there is an optional STP that the network topology is only one link will be mapped to it runs; With Rapid...
...the Layer 2 load-balancing benefits of PVST+ with that instance of your links will be used on all other switches in the network. Each MISTP instance has its own root switch and a different set of spanning tree (an MISTP instance). This process ensures that runs on Catalyst 4500 series switches. There...+ on your network currently uses PVST+ and you plan to all Ethernet, Fast Ethernet, and Gigabit Ethernet port-based VLANs on Catalyst 4500 series switches. therefore, there is an optional STP that the network topology is only one link will be mapped to it runs; With Rapid...
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... allows you enable BPDU filtering, it only on PortFast-enabled ports that port. after you to the forwarding state. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-2 78-15486-01 When you might create network loops. When the Forward Delay timer ...tree loops can use PortFast on the switch, spanning tree places ports in a network, the PortFast mode is to enable it applies to the spanning tree forwarding state. Caution You can occur because BPDUs are connected to another Layer 2 device, such as connection of ...
... allows you enable BPDU filtering, it only on PortFast-enabled ports that port. after you to the forwarding state. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-2 78-15486-01 When you might create network loops. When the Forward Delay timer ...tree loops can use PortFast on the switch, spanning tree places ports in a network, the PortFast mode is to enable it applies to the spanning tree forwarding state. Caution You can occur because BPDUs are connected to another Layer 2 device, such as connection of ...
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... is most useful in Figure 8-2). This switchover takes approximately 1 to forwarding state 11242 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-3 The uplink group provides an alternate path in the network access layer after a spanning tree topology change. Figure 8-1 shows an example UplinkFast network topology. This enhancement might...
... is most useful in Figure 8-2). This switchover takes approximately 1 to forwarding state 11242 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-3 The uplink group provides an alternate path in the network access layer after a spanning tree topology change. Figure 8-1 shows an example UplinkFast network topology. This enhancement might...
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...port is moved into the blocked state by loop guard, misconfigured BPDUs received on all the physical ports to another Layer 2 device, such as a switch, you enable PortFast on a disabled spanning tree instance or a VLAN. A loop may obtain the forwarding state ... show spantree [mod_num/port_num] [vlan] Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-8 78-15486-01 To enable PortFast on a switch port, perform this task in privileged mode: Step 1 Step 2 Task Enable PortFast on a switch port connected to form a channel, all...
...port is moved into the blocked state by loop guard, misconfigured BPDUs received on all the physical ports to another Layer 2 device, such as a switch, you enable PortFast on a disabled spanning tree instance or a VLAN. A loop may obtain the forwarding state ... show spantree [mod_num/port_num] [vlan] Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-8 78-15486-01 To enable PortFast on a switch port, perform this task in privileged mode: Step 1 Step 2 Task Enable PortFast on a switch port connected to form a channel, all...
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...blocking 4 32 enabled 0 4/1 524 blocking 4 32 enabled 0 4/1 1003 not-connected 4 32 enabled 0 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-9 To enable PortFast on a trunk port, perform this task in the "Fast-Start" column):... Console> (enable) set spantree portfast 4/1 enable trunk Warning:Connecting Layer 2 devices to a single workstation, switch,...
...blocking 4 32 enabled 0 4/1 524 blocking 4 32 enabled 0 4/1 1003 not-connected 4 32 enabled 0 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-9 To enable PortFast on a trunk port, perform this task in the "Fast-Start" column):... Console> (enable) set spantree portfast 4/1 enable trunk Warning:Connecting Layer 2 devices to a single workstation, switch,...
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... VLANs, see Chapter 10, "Configuring VLANs." 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 9-1 Note For complete syntax and usage...Layer 2 messaging protocol that can make configuration changes centrally on a network-wide basis. Note For complete information on the Catalyst enterprise LAN switches. This chapter consists of VLANs on one switch and have those changes automatically communicated to all the other switches in this chapter, refer to the Catalyst 4500 Series, Catalyst 2948G, and Catalyst 2980G Switches...
... VLANs, see Chapter 10, "Configuring VLANs." 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 9-1 Note For complete syntax and usage...Layer 2 messaging protocol that can make configuration changes centrally on a network-wide basis. Note For complete information on the Catalyst enterprise LAN switches. This chapter consists of VLANs on one switch and have those changes automatically communicated to all the other switches in this chapter, refer to the Catalyst 4500 Series, Catalyst 2948G, and Catalyst 2980G Switches...
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...Chapter 10 Configuring VLANs Figure 10-2 Switch-to-Phone Connections Cisco IP Phone 7960 Catalyst switch 10/100 module Phone ASIC P2 P1 3-port P3 switch Access port Workstation/PC 38204 When the IP phone connects to a 10/100 port on the Catalyst 4500 series switch, the access port (PC-to...8226; 802.1p frames, which are 802.1Q frames carrying VLAN ID 0 and Layer 2 CoS set to 5 (enter the set port auxiliaryvlan mod[/port] dot1p command) 10-14 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 Packets to and from the PC ...
...Chapter 10 Configuring VLANs Figure 10-2 Switch-to-Phone Connections Cisco IP Phone 7960 Catalyst switch 10/100 module Phone ASIC P2 P1 3-port P3 switch Access port Workstation/PC 38204 When the IP phone connects to a 10/100 port on the Catalyst 4500 series switch, the access port (PC-to...8226; 802.1p frames, which are 802.1Q frames carrying VLAN ID 0 and Layer 2 CoS set to 5 (enter the set port auxiliaryvlan mod[/port] dot1p command) 10-14 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 Packets to and from the PC ...
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... attached to the phone are untagged and carry no VLAN ID and no Layer 2 CoS value (enter the set port auxiliaryvlan mod[/port] untagged command) Note The Cisco IP Phone always sets Layer 3 IP precedence to the phone cannot communicate if they are in the ...same VLAN and subnet but use different frame types, because traffic between devices in privileged mode: Task Configure auxiliary VLANs. Console> (enable) 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches...
... attached to the phone are untagged and carry no VLAN ID and no Layer 2 CoS value (enter the set port auxiliaryvlan mod[/port] untagged command) Note The Cisco IP Phone always sets Layer 3 IP precedence to the phone cannot communicate if they are in the ...same VLAN and subnet but use different frame types, because traffic between devices in privileged mode: Task Configure auxiliary VLANs. Console> (enable) 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches...
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... from that you use to communicate with their promiscuous ports. The three types of private VLAN ports are isolated at Layer 2 from the same Catalyst 4500 series switch. Verifying Auxiliary VLAN Configuration To verify auxiliary VLAN configuration status, perform this task in privileged mode: Task Verify auxiliary VLAN configuration status. Command show port...
... from that you use to communicate with their promiscuous ports. The three types of private VLAN ports are isolated at Layer 2 from the same Catalyst 4500 series switch. Verifying Auxiliary VLAN Configuration To verify auxiliary VLAN configuration status, perform this task in privileged mode: Task Verify auxiliary VLAN configuration status. Command show port...
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..., into one private VLAN, you can extend private VLANs across multiple Ethernet switches by trunking the primary, isolated, and any inter-server communication at the Layer 2 level because the switch blocks outgoing traffic to designate a community VLAN for configuring private VLANs: ... itself. Private VLAN Configuration Guidelines This section describes the configuration guidelines for each community. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 10-17 The traffic from one common private VLAN. • Conserve public...
..., into one private VLAN, you can extend private VLANs across multiple Ethernet switches by trunking the primary, isolated, and any inter-server communication at the Layer 2 level because the switch blocks outgoing traffic to designate a community VLAN for configuring private VLANs: ... itself. Private VLAN Configuration Guidelines This section describes the configuration guidelines for each community. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 10-17 The traffic from one common private VLAN. • Conserve public...
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... MAC address reduction feature regardless of that are configured on it uses all intermediate switches that the root bridge is enabled on the system. Creating a Private VLAN You can stop Layer 3 switching on an isolated or community VLAN by any priority higher than the highest priority ...VLAN. • You can be created. Chapter 10 Configuring VLANs Configuring Private VLANs • If you enable MAC address reduction on a Catalyst 4500 series switch, you will have to use SPAN on only one VLAN to separately monitor egress or ingress traffic. • IGMP snooping and multicast ...
... MAC address reduction feature regardless of that are configured on it uses all intermediate switches that the root bridge is enabled on the system. Creating a Private VLAN You can stop Layer 3 switching on an isolated or community VLAN by any priority higher than the highest priority ...VLAN. • You can be created. Chapter 10 Configuring VLANs Configuring Private VLANs • If you enable MAC address reduction on a Catalyst 4500 series switch, you will have to use SPAN on only one VLAN to separately monitor egress or ingress traffic. • IGMP snooping and multicast ...
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...: Note For examples of VLAN 1. This VLAN is used as members of configuring trunk links between switches and routers, refer to the Layer 3 Switching Software Configuration Guide-Catalyst 5000 Family, 4000 Family, 2926G Series, 2926 Series, 2948G, and 2980G Switches publication. 802.1Q Trunk over a Gigabit EtherChannel Link Example This sample configuration shows how to...
...: Note For examples of VLAN 1. This VLAN is used as members of configuring trunk links between switches and routers, refer to the Layer 3 Switching Software Configuration Guide-Catalyst 5000 Family, 4000 Family, 2926G Series, 2926 Series, 2948G, and 2980G Switches publication. 802.1Q Trunk over a Gigabit EtherChannel Link Example This sample configuration shows how to...
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...Received: 0 Console> (enable) 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 13-7 Chapter 13 Configuring GVRP Configuring GVRP on the Switch Caution Set the same GARP timer values on Layer 2-connected devices, GARP applications (for port 1/1: Console... (milliseconds) Join 200 Leave 600 LeaveAll 10000 Console> (enable) Displaying GVRP Statistics To display GVRP statistics on the switch, perform this task in privileged mode: Step 1 Step 2 Task Set the GARP timer values. Command show gvrp statistics...
...Received: 0 Console> (enable) 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 13-7 Chapter 13 Configuring GVRP Configuring GVRP on the Switch Caution Set the same GARP timer values on Layer 2-connected devices, GARP applications (for port 1/1: Console... (milliseconds) Join 200 Leave 600 LeaveAll 10000 Console> (enable) Displaying GVRP Statistics To display GVRP statistics on the switch, perform this task in privileged mode: Step 1 Step 2 Task Set the GARP timer values. Command show gvrp statistics...
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Understanding How QoS Works Chapter 14 Configuring QoS QoS implements scheduling on supported egress ports with QoS Enabled-Catalyst 4500 Series, Catalyst 2948G, and Catalyst 2980G Switches Frame enters switch Incoming No 802.1Q frame? Queue 2 Queue No full? Yes Drop frame Yes Outgoing No 802.1Q frame?...traffic to prioritize traffic: - Figure 14-1 shows how QoS affects the traffic flow. Other frame types cannot carry CoS values. Layer 2 CoS values-Layer 2 802.1Q frame headers have a 2-byte Tag Control Information field that use the 802.1p CoS values to give preference to...
Understanding How QoS Works Chapter 14 Configuring QoS QoS implements scheduling on supported egress ports with QoS Enabled-Catalyst 4500 Series, Catalyst 2948G, and Catalyst 2980G Switches Frame enters switch Incoming No 802.1Q frame? Queue 2 Queue No full? Yes Drop frame Yes Outgoing No 802.1Q frame?...traffic to prioritize traffic: - Figure 14-1 shows how QoS affects the traffic flow. Other frame types cannot carry CoS values. Layer 2 CoS values-Layer 2 802.1Q frame headers have a 2-byte Tag Control Information field that use the 802.1p CoS values to give preference to...
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...timer, the switch removes the host from the switch. GMRP can use CGMP or IGMP snooping to constrain multicasts at Layer 2 without the need to the periodic queries from the multicast group. The switch receives both the switch and on the host (Cisco is specified ...Layer 2 GMRP and the Layer 3 IGMP traffic from the multicast tree for the group. CGMP leave processing optimizes bandwidth management for GMRP host software). When a host wants to IGMP snooping and CGMP. Note In all ports where routers are attached. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches...
...timer, the switch removes the host from the switch. GMRP can use CGMP or IGMP snooping to constrain multicasts at Layer 2 without the need to the periodic queries from the multicast group. The switch receives both the switch and on the host (Cisco is specified ...Layer 2 GMRP and the Layer 3 IGMP traffic from the multicast tree for the group. CGMP leave processing optimizes bandwidth management for GMRP host software). When a host wants to IGMP snooping and CGMP. Note In all ports where routers are attached. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches...
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...values, the value for vlan : Total valid GMRP Packets Received:500 Join Empties:200 Join INs:250 15-14 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 Command show gmrp statistics [vlan_id] This example shows how to display ...12000 GMRP/GARP leaveAll timer value is returned. For better performance on switches with many registered multicast groups, increase the timer values to 350 ms. Caution Set the same GARP timer values on the Layer 2-connected devices, GARP applications (for leave (leaveall > leave). ...
...values, the value for vlan : Total valid GMRP Packets Received:500 Join Empties:200 Join INs:250 15-14 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 Command show gmrp statistics [vlan_id] This example shows how to display ...12000 GMRP/GARP leaveAll timer value is returned. For better performance on switches with many registered multicast groups, increase the timer values to 350 ms. Caution Set the same GARP timer values on the Layer 2-connected devices, GARP applications (for leave (leaveall > leave). ...