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... Sessions 20-8 Using Ping 20-9 Understanding How Ping Works 20-9 Executing Ping 20-10 Using Layer 2 Traceroute 20-11 Layer 2 Traceroute Usage Guidelines 20-11 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...
... Sessions 20-8 Using Ping 20-9 Understanding How Ping Works 20-9 Executing Ping 20-10 Using Layer 2 Traceroute 20-11 Layer 2 Traceroute Usage Guidelines 20-11 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...
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... R 78-15486-01 Accounting Events 30-48 Specifying When to Create Accounting Records 30-48 Specifying RADIUS Servers 30-49 Updating the ...31-9 Setting and Enabling Automatic Reauthentication of the Host 31-10 Manually Reauthenticating the Host 31-10 Enabling Multiple Hosts 31-11 Disabling Multiple Hosts 31-11 ...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 ... Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 xix
... R 78-15486-01 Accounting Events 30-48 Specifying When to Create Accounting Records 30-48 Specifying RADIUS Servers 30-49 Updating the ...31-9 Setting and Enabling Automatic Reauthentication of the Host 31-10 Manually Reauthenticating the Host 31-10 Enabling Multiple Hosts 31-11 Disabling Multiple Hosts 31-11 ...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 ... Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 xix
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... It results in loss of data traffic during the debouncing period. Console> (enable) Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 4-6 78-15486-01 This situation might affect the convergence/...10/100/1000BASE-TX ports Gigabit TX ports Fiber Gigabit ports Delay Time With Debounce Timer Disabled 0 ms 0 ms 0 ms 0 ms 0 ms With Debounce Timer Enabled 3.1 sec 3.1 sec 3.1 sec 3.1 sec 3.1 sec Note The delay time is the time that the port is physically down before the switch notifies the main processor of various Layer...
... It results in loss of data traffic during the debouncing period. Console> (enable) Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 4-6 78-15486-01 This situation might affect the convergence/...10/100/1000BASE-TX ports Gigabit TX ports Fiber Gigabit ports Delay Time With Debounce Timer Disabled 0 ms 0 ms 0 ms 0 ms 0 ms With Debounce Timer Enabled 3.1 sec 3.1 sec 3.1 sec 3.1 sec 3.1 sec Note The delay time is the time that the port is physically down before the switch notifies the main processor of various Layer...
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...Cisco proprietary spanning tree protocols, PVST+ and MISTP, are based on the IEEE 802.1D STP. (See the "Understanding How PVST+ and MISTP Modes Work" section on what the port's function is a Layer 2 management protocol that have ports with these assigned roles are called root or designated switches...active path. Port roles are as the root of the switches in a loopback configuration Switches that provides path redundancy in the active topology. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 7-2 78-15486-01 This ...
...Cisco proprietary spanning tree protocols, PVST+ and MISTP, are based on the IEEE 802.1D STP. (See the "Understanding How PVST+ and MISTP Modes Work" section on what the port's function is a Layer 2 management protocol that have ports with these assigned roles are called root or designated switches...active path. Port roles are as the root of the switches in a loopback configuration Switches that provides path redundancy in the active topology. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 7-2 78-15486-01 This ...
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... a single MISTP instance. There is the same as PVST+, except that all other switches in an MISTP network; MISTP discards any topology change. PVST+ provides Layer 2 load balancing for the VLAN on Catalyst 4500 series switches. MISTP allows you can easily move a VLAN (or VLANs) in this process ensures...instance is the default STP used but no one BPDU for each VLAN as PVST+, and you must first enable MISTP-PVST+ on Catalyst 4500 series switches. PVST+ Mode PVST+ is a virtual logical topology defined by exchanging MISTP BPDUs with the lower CPU load of MISTP to it ...
... a single MISTP instance. There is the same as PVST+, except that all other switches in an MISTP network; MISTP discards any topology change. PVST+ provides Layer 2 load balancing for the VLAN on Catalyst 4500 series switches. MISTP allows you can easily move a VLAN (or VLANs) in this process ensures...instance is the default STP used but no one BPDU for each VLAN as PVST+, and you must first enable MISTP-PVST+ on Catalyst 4500 series switches. PVST+ Mode PVST+ is a virtual logical topology defined by exchanging MISTP BPDUs with the lower CPU load of MISTP to it ...
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... Note When enabled on PortFast-enabled ports that port. 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 enabled on the switch, spanning tree shuts down PortFast-configured interfaces that receive ... errdisable state when a BPDU is on that are still being transmitted and received on a switch or trunk port, the port is immediately transitioned to another Layer 2 device, such as connection of going through the listening, learning, and forwarding states. Understanding...
... Note When enabled on PortFast-enabled ports that port. 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 enabled on the switch, spanning tree shuts down PortFast-configured interfaces that receive ... errdisable state when a BPDU is on that are still being transmitted and received on a switch or trunk port, the port is immediately transitioned to another Layer 2 device, such as connection of going through the listening, learning, and forwarding states. Understanding...
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..., Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-3 The uplink group provides an alternate path in Figure 8-2). Figure 8-1 UplinkFast Example Before Direct Link Failure Switch A (Root) Switch B L1 L2 L3 Blocked port 11241 Switch C If Switch C detects a link failure on the currently active link L2 (a direct link failure), UplinkFast unblocks the blocked port on backbone or distribution layer switches...
..., Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-3 The uplink group provides an alternate path in Figure 8-2). Figure 8-1 UplinkFast Example Before Direct Link Failure Switch A (Root) Switch B L1 L2 L3 Blocked port 11241 Switch C If Switch C detects a link failure on the currently active link L2 (a direct link failure), UplinkFast unblocks the blocked port on backbone or distribution layer switches...
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...8226; You can take advantage of ports that port. • Loop guard uses the ports known to another Layer 2 device, such as a switch, you might create network loops. Configuring PortFast Chapter 8 Configuring Spanning Tree PortFast, BPDU Guard, BPDU Filter, ... PVID-inconsistent ports. 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 loop guard: - ...
...8226; You can take advantage of ports that port. • Loop guard uses the ports known to another Layer 2 device, such as a switch, you might create network loops. Configuring PortFast Chapter 8 Configuring Spanning Tree PortFast, BPDU Guard, BPDU Filter, ... PVID-inconsistent ports. 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 loop guard: - ...
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...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 Console> (enable) show spantree 4/1 Port Vlan Port-State Cost Priority 4/1 1 blocking 19 20 4/1 100 forwarding 10 20 4/1 521 blocking 19 20 4/1 522 blocking 19...show spantree portfast [mod_num/port_num] This example shows how to another Layer 2 device, like a switch, you enter the set spantree portfast 4/1 enable trunk Warning:Connecting Layer 2 devices to a fast start port can cause temporary spanning ...
...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 Console> (enable) show spantree 4/1 Port Vlan Port-State Cost Priority 4/1 1 blocking 19 20 4/1 100 forwarding 10 20 4/1 521 blocking 19 20 4/1 522 blocking 19...show spantree portfast [mod_num/port_num] This example shows how to another Layer 2 device, like a switch, you enter the set spantree portfast 4/1 enable trunk Warning:Connecting Layer 2 devices to a fast start port can cause temporary spanning ...
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... 9-22 • 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 2 do..., you can result in this chapter, refer to configure the VLAN Trunking Protocol (VTP) on configuring 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
... 9-22 • 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 2 do..., you can result in this chapter, refer to configure the VLAN Trunking Protocol (VTP) on configuring 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
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... network where there are 802.1Q frames carrying VLAN ID 0 and Layer 2 CoS set to 5 (enter the set port auxiliaryvlan mod[/port] aux_vlan_id command. Introducing IP-based phones into existing switch-based networks raises the following : • Voice traffic to and from.... Configuring Auxiliary VLANs 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...
... network where there are 802.1Q frames carrying VLAN ID 0 and Layer 2 CoS set to 5 (enter the set port auxiliaryvlan mod[/port] aux_vlan_id command. Introducing IP-based phones into existing switch-based networks raises the following : • Voice traffic to and from.... Configuring Auxiliary VLANs 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...
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...] untagged command) Note The Cisco IP Phone always sets Layer 3 IP precedence to two VLANs-a native VLAN and an auxiliary VLAN. Console> (enable) 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 10-15 They use switch commands to configure a frame ...12 will not send or receive CDP messages with Voice VLAN information. Chapter 10 Configuring VLANs Configuring Auxiliary VLANs • 802.3 frames, which are untagged and carry no VLAN ID and no Layer 2 CoS value (enter the set port auxiliaryvlan 5/7 untagged Port 5/7 ...
...] untagged command) Note The Cisco IP Phone always sets Layer 3 IP precedence to two VLANs-a native VLAN and an auxiliary VLAN. Console> (enable) 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 10-15 They use switch commands to configure a frame ...12 will not send or receive CDP messages with Voice VLAN information. Chapter 10 Configuring VLANs Configuring Auxiliary VLANs • 802.3 frames, which are untagged and carry no VLAN ID and no Layer 2 CoS value (enter the set port auxiliaryvlan 5/7 untagged Port 5/7 ...
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... VLANs The default setting is a VLAN that you configure to have some Layer 2 isolation from the same Catalyst 4500 series switch. Table 10-3 Keyword Descriptions Keyword dot1p untagged none Action Specify that the phone send untagged packets. ...port has complete Layer 2 separation, including broadcasts, from other ports within the same private VLAN. 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 Table 10-3 lists the set...
... VLANs The default setting is a VLAN that you configure to have some Layer 2 isolation from the same Catalyst 4500 series switch. Table 10-3 Keyword Descriptions Keyword dot1p untagged none Action Specify that the phone send untagged packets. ...port has complete Layer 2 separation, including broadcasts, from other ports within the same private VLAN. 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 Table 10-3 lists the set...
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...VLAN as an isolated VLAN. You can extend private VLANs across multiple Ethernet switches by a group of stations. Chapter 10 Configuring VLANs Configuring Private VLANs Privacy is granted at Layer 2. • Designate as promiscuous the ports to which eliminates the need ...to allocate only one private VLAN, you can assign an individual VLAN and associated IP subnet to each community. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 10...
...VLAN as an isolated VLAN. You can extend private VLANs across multiple Ethernet switches by a group of stations. Chapter 10 Configuring VLANs Configuring Private VLANs Privacy is granted at Layer 2. • Designate as promiscuous the ports to which eliminates the need ...to allocate only one private VLAN, you can assign an individual VLAN and associated IP subnet to each community. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 10...
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...Layer 3 switching on an isolated or community VLAN by destroying the binding of that a private VLAN needs to enable MAC address reduction on all its primary VLAN. Chapter 10 Configuring VLANs Configuring Private VLANs • If you enable MAC address reduction on a Catalyst 4500 series switch...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 Otherwise, in private VLANs. • You cannot enable EtherChannel on isolated, community, or...
...Layer 3 switching on an isolated or community VLAN by destroying the binding of that a private VLAN needs to enable MAC address reduction on all its primary VLAN. Chapter 10 Configuring VLANs Configuring Private VLANs • If you enable MAC address reduction on a Catalyst 4500 series switch...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 Otherwise, in private VLANs. • You cannot enable EtherChannel on isolated, community, or...
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...then configure the EtherChannel bundle 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 ... Ethernet and Gigabit Ethernet Ports Example VLAN Trunk Configurations Port Vlans in spanning tree forwarding state and not pruned 4/1 2-6,10,20,50,100,152,200,300,400,500,521,524,570,776,802,850,917,999 Console> (enable) Example VLAN Trunk Configurations ...
...then configure the EtherChannel bundle 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 ... Ethernet and Gigabit Ethernet Ports Example VLAN Trunk Configurations Port Vlans in spanning tree forwarding state and not pruned 4/1 2-6,10,20,50,100,152,200,300,400,500,521,524,570,776,802,850,917,999 Console> (enable) Example VLAN Trunk Configurations ...
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...) do not operate successfully. Console> (enable) set garp timer join 200 GMRP/GARP join timer value is set differently on Layer 2-connected devices, GARP applications (for port 1/1: Console> (enable) show gvrp statistics [mod_num/port_num] This example shows how to... Transmitted: 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 to...
...) do not operate successfully. Console> (enable) set garp timer join 200 GMRP/GARP join timer value is set differently on Layer 2-connected devices, GARP applications (for port 1/1: Console> (enable) show gvrp statistics [mod_num/port_num] This example shows how to... Transmitted: 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 to...
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... 2From set qos map command Address lookup and other processing 2Map frame CoS Queue 1 value to be marked. 14-2 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 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...
... 2From set qos map command Address lookup and other processing 2Map frame CoS Queue 1 value to be marked. 14-2 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 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...
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... hosts on both the Layer 2 GMRP and the Layer 3 IGMP traffic from the multicast tree for the group. GMRP software components run on a switched network, even when multiple multicast groups are attached. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release ... are in the host's VLAN. GMRP can register and deregister multicast group addresses at Layer 2 without the need to install or configure software on the host (Cisco is a Generic Attribute Registration Protocol (GARP) application that provides a constrained multicast flooding...
... hosts on both the Layer 2 GMRP and the Layer 3 IGMP traffic from the multicast tree for the group. GMRP software components run on a switched network, even when multiple multicast groups are attached. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release ... are in the host's VLAN. GMRP can register and deregister multicast group addresses at Layer 2 without the need to install or configure software on the host (Cisco is a Generic Attribute Registration Protocol (GARP) application that provides a constrained multicast flooding...
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... 23 GMRP Statistics 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 If you attempt to set a timer value that does not adhere ...timer Timer Timer Value (milliseconds) Join 300 Leave 650 LeaveAll 12000 Console> (enable) Displaying GMRP Statistics To display GMRP statistics on the Layer 2-connected devices, GARP applications (for example, GMRP and GVRP) will not operate successfully. Verify the configuration. Console> (enable) set...
... 23 GMRP Statistics 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 If you attempt to set a timer value that does not adhere ...timer Timer Timer Value (milliseconds) Join 300 Leave 650 LeaveAll 12000 Console> (enable) Displaying GMRP Statistics To display GMRP statistics on the Layer 2-connected devices, GARP applications (for example, GMRP and GVRP) will not operate successfully. Verify the configuration. Console> (enable) set...