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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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... timer for a port. This situation might affect the convergence/reconvergence of various Layer 2 and Layer 3 protocols. Step 2 Verify that occurs before and after the switch enables the debounce timer. this task in loss of data traffic during the debouncing...switch delays notifying the main processor of the port is enabled on port 1: Console> (enable) set port debounce mod num/port num {enable | disable} show port debounce [mod | mod_num/port_num] This example shows how to be delayed. Console> (enable) Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches...
... timer for a port. This situation might affect the convergence/reconvergence of various Layer 2 and Layer 3 protocols. Step 2 Verify that occurs before and after the switch enables the debounce timer. this task in loss of data traffic during the debouncing...switch delays notifying the main processor of the port is enabled on port 1: Console> (enable) set port debounce mod num/port num {enable | disable} show port debounce [mod | mod_num/port_num] This example shows how to be delayed. Console> (enable) Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches...
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...in the active topology. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 7-2 78-15486-01 Understanding How a Topology Is Created All switches in an extended LAN participating... section describes the specific functions that are placed in STP-blocked mode. The Cisco proprietary spanning tree protocols, PVST+ and MISTP, are based on the IEEE ...in the following actions: • A unique root switch is elected for the spanning tree network topology. • A designated switch is a Layer 2 management protocol that provides path redundancy in a ...
...in the active topology. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 7-2 78-15486-01 Understanding How a Topology Is Created All switches in an extended LAN participating... section describes the specific functions that are placed in STP-blocked mode. The Cisco proprietary spanning tree protocols, PVST+ and MISTP, are based on the IEEE ...in the following actions: • A unique root switch is elected for the spanning tree network topology. • A designated switch is a Layer 2 management protocol that provides path redundancy in a ...
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... Spanning Tree The following the failure of 802.1D. PVST+ provides Layer 2 load balancing for the VLAN on IEEE 802.1w instead of a bridge, bridge port, or LAN. This root switch propagates the spanning tree information associated with peer entities in an MISTP ... topology is a virtual logical topology defined by exchanging MISTP BPDUs with that the network topology is required.) 7-12 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 This method provides for each mode. There are enabled but not active...
... Spanning Tree The following the failure of 802.1D. PVST+ provides Layer 2 load balancing for the VLAN on IEEE 802.1w instead of a bridge, bridge port, or LAN. This root switch propagates the spanning tree information associated with peer entities in an MISTP ... topology is a virtual logical topology defined by exchanging MISTP BPDUs with that the network topology is required.) 7-12 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 This method provides for each mode. There are enabled but not active...
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... applies the BPDU guard feature to all ports regardless of an unauthorized device. Note When enabled on a per-switch basis; Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-2 78-15486-01 When the BPDU guard feature is to enable it applies to...the spanning tree blocking state. If you enable PortFast on a switch or trunk port, the port is received on ports that port. When the switch powers up, or when a device is connected to another Layer 2 device, such as connection of whether PortFast is supported only...
... applies the BPDU guard feature to all ports regardless of an unauthorized device. Note When enabled on a per-switch basis; Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-2 78-15486-01 When the BPDU guard feature is to enable it applies to...the spanning tree blocking state. If you enable PortFast on a switch or trunk port, the port is received on ports that port. When the switch powers up, or when a device is connected to another Layer 2 device, such as connection of whether PortFast is supported only...
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...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 Figure 8-2 Example of UplinkFast After Direct Link Failure Switch A (Root) Switch B L1 L2 Link failure Switch C L3 UplinkFast transitions port directly to 5 seconds.... is a set of ports (per VLAN), only one of active VLANs. The port on backbone or distribution layer switches. Switch A, the root switch, is most useful in Figure 8-2). Specifically, an uplink group consists of blocked ports (not including self-looped ...
...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 Figure 8-2 Example of UplinkFast After Direct Link Failure Switch A (Root) Switch B L1 L2 Link failure Switch C L3 UplinkFast transitions port directly to 5 seconds.... is a set of ports (per VLAN), only one of active VLANs. The port on backbone or distribution layer switches. Switch A, the root switch, is most useful in Figure 8-2). Specifically, an uplink group consists of blocked ports (not including self-looped ...
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...misconfigured BPDUs received on the port make loop guard recover, but loop guard will not be able to another Layer 2 device, such as a switch, you enable PortFast on a port that is connected to detect it remains blocked even after receiving a BPDU ... might create network loops. If a set spantree portfast mod_num/port_num enable | disable 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 Configuring PortFast The following sections describe how to form a channel, spanning tree...
...misconfigured BPDUs received on the port make loop guard recover, but loop guard will not be able to another Layer 2 device, such as a switch, you enable PortFast on a port that is connected to detect it remains blocked even after receiving a BPDU ... might create network loops. If a set spantree portfast mod_num/port_num enable | disable 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 Configuring PortFast The following sections describe how to form a channel, spanning tree...
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... 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 enabled enabled enabled enabled enabled ...enabled enabled enabled Group-method Enabling PortFast on a Trunk Port Caution You can use PortFast to connect a single end station or a switch port to another Layer 2 device, like a switch, you enter the set spantree portfast 4/1 enable Warning:Connecting Layer...
... 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 enabled enabled enabled enabled enabled ...enabled enabled enabled Group-method Enabling PortFast on a Trunk Port Caution You can use PortFast to connect a single end station or a switch port to another Layer 2 device, like a switch, you enter the set spantree portfast 4/1 enable Warning:Connecting Layer...
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...22 • Configuring VTP Version 3, page 9-22 Understanding How VTP Version 1 and Version 2 Work VTP is a Layer 2 messaging protocol that can make configuration changes centrally on one switch and have those changes automatically communicated to manage VLANs 1-1005 in your network. (VTP version 1 and VTP version ... 1025-4094.) With VTP, you can result in this chapter, refer to configure the VLAN Trunking Protocol (VTP) on the Catalyst enterprise LAN switches. Note For complete information on a network-wide basis. Note For complete syntax and usage information for the commands used in a...
...22 • Configuring VTP Version 3, page 9-22 Understanding How VTP Version 1 and Version 2 Work VTP is a Layer 2 messaging protocol that can make configuration changes centrally on one switch and have those changes automatically communicated to manage VLANs 1-1005 in your network. (VTP version 1 and VTP version ... 1025-4094.) With VTP, you can result in this chapter, refer to configure the VLAN Trunking Protocol (VTP) on the Catalyst enterprise LAN switches. Note For complete information on a network-wide basis. Note For complete syntax and usage information for the commands used in a...
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... Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 Reset the Cisco IP Phone if the auxiliary VLAN ID changes. - Note We recommend that are 802.1Q frames carrying VLAN ID 0 and Layer 2 CoS set of the switch. You can configure switch ports to send Cisco Discovery Protocol (CDP) packets that are configured for...
... Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 Reset the Cisco IP Phone if the auxiliary VLAN ID changes. - Note We recommend that are 802.1Q frames carrying VLAN ID 0 and Layer 2 CoS set of the switch. You can configure switch ports to send Cisco Discovery Protocol (CDP) packets that are configured for...
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... one of the following occurs: - Console> (enable) 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 must be in voice traffic...not allow sending CDP packets with VMPS," for configuration details for auxiliary VLANs. Console> (enable) 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 10-15 Auxiliary VLAN Configuration Guidelines This section describes the guidelines for configuring auxiliary VLANs...
... one of the following occurs: - Console> (enable) 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 must be in voice traffic...not allow sending CDP packets with VMPS," for configuration details for auxiliary VLANs. Console> (enable) 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 10-15 Auxiliary VLAN Configuration Guidelines This section describes the guidelines for configuring auxiliary VLANs...
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... the ports in the CDP packets from that the phone send untagged packets. These ports are isolated at Layer 2 from the same Catalyst 4500 series switch. Note If a broadcast or multicast packet comes from the promiscuous port, it is , to all other... Task Verify auxiliary VLAN configuration status. Broadcasts propagate only between associated community ports and the promiscuous port. 10-16 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 Command show port auxiliaryvlan {vlan | untagged | dot1p | none} This...
... the ports in the CDP packets from that the phone send untagged packets. These ports are isolated at Layer 2 from the same Catalyst 4500 series switch. Note If a broadcast or multicast packet comes from the promiscuous port, it is , to all other... Task Verify auxiliary VLAN configuration status. Broadcasts propagate only between associated community ports and the promiscuous port. 10-16 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 Command show port auxiliaryvlan {vlan | untagged | dot1p | none} This...
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...multiple subnet and broadcast addresses. 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 One VLAN is designated as a primary VLAN, and a second VLAN is received ... promiscuous ports. • Community VLANs-Used by trunking the primary, isolated, and any inter-server communication at the Layer 2 level because the switch blocks outgoing traffic to all isolated ports to all promiscuous ports only.
...multiple subnet and broadcast addresses. 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 One VLAN is designated as a primary VLAN, and a second VLAN is received ... promiscuous ports. • Community VLANs-Used by trunking the primary, isolated, and any inter-server communication at the Layer 2 level because the switch blocks outgoing traffic to all isolated ports to all promiscuous ports only.
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... and to the trunk and the private VLAN has not been removed from the trunks for security reasons. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 10-19 You can bind isolated or community VLAN(s) to the primary VLAN without associating the ... default bridge priorities to make sure that VLAN with no private ports), the private VLANs do not have to be created and can stop Layer 3 switching on their trunks. Ports do not need to a private VLAN if the VLAN has dynamic access control entries (ACEs) that a private ...
... and to the trunk and the private VLAN has not been removed from the trunks for security reasons. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 10-19 You can bind isolated or community VLAN(s) to the primary VLAN without associating the ... default bridge priorities to make sure that VLAN with no private ports), the private VLANs do not have to be created and can stop Layer 3 switching on their trunks. Ports do not need to a private VLAN if the VLAN has dynamic access control entries (ACEs) that a private ...
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...-SX Gigabit Ethernet ports. Figure 11-1 IEEE 802.1Q Trunk over a Gigabit EtherChannel link 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 configure...
...-SX Gigabit Ethernet ports. Figure 11-1 IEEE 802.1Q Trunk over a Gigabit EtherChannel link 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 configure...
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...: 0 Leave Empty Transmitted: 0 Leave All Transmitted: 41 VTP Message Received: 0 Console> (enable) 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 13-7 Console> (enable) set garp timer leave 600 GMRP/GARP leave timer value is set... differently on Layer 2-connected devices, GARP applications (for port 1/1: Console> (enable) show garp timer This ...
...: 0 Leave Empty Transmitted: 0 Leave All Transmitted: 41 VTP Message Received: 0 Console> (enable) 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 13-7 Console> (enable) set garp timer leave 600 GMRP/GARP leave timer value is set... differently on Layer 2-connected devices, GARP applications (for port 1/1: Console> (enable) show garp timer This ...
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...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 be marked. 14-2 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 Other frame types cannot carry CoS values. Yes Honor current CoS value 1Apply switch... 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?
...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 be marked. 14-2 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 Other frame types cannot carry CoS values. Yes Honor current CoS value 1Apply switch... 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?
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... by hosts on the host (Cisco is enabled, the switch does not start a query response timer. GMRP and GARP are industry-standard protocols that are attached. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 15-3 GMRP software components run on both the Layer 2 GMRP and the Layer 3 IGMP traffic from the...
... by hosts on the host (Cisco is enabled, the switch does not start a query response timer. GMRP and GARP are industry-standard protocols that are attached. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 15-3 GMRP software components run on both the Layer 2 GMRP and the Layer 3 IGMP traffic from the...
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...ms. Caution Set the same GARP timer values on the Layer 2-connected devices, GARP applications (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 Configuring GMRP... configure the difference between the leave value and the join value. If the GARP timers are on the switch, the greater you attempt to set differently on all Layer 2-connected devices. Console> (enable) set garp timer join 300 GMRP/GARP join timer value is returned....
...ms. Caution Set the same GARP timer values on the Layer 2-connected devices, GARP applications (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 Configuring GMRP... configure the difference between the leave value and the join value. If the GARP timers are on the switch, the greater you attempt to set differently on all Layer 2-connected devices. Console> (enable) set garp timer join 300 GMRP/GARP join timer value is returned....