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...VLAN Cost 6-21 Clearing LACP Statistics 6-21 Displaying EtherChannel Traffic Utilization 6-21 Disabling an EtherChannel 6-22 Displaying Spanning Tree-Related Information for EtherChannels 6-22 7 C H A P T E R Configuring Spanning Tree 7-1 Understanding How STPs Work 7-2 Understanding How a Topology Is Created 7-2 Understanding How a Switch or Port Becomes the Root Switch or Root Port 7-3 Understanding BPDUs 7-4 Calculating and Assigning Port... 7-18 MST Configuration 7-18 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 vi 78-15486-01
...VLAN Cost 6-21 Clearing LACP Statistics 6-21 Displaying EtherChannel Traffic Utilization 6-21 Disabling an EtherChannel 6-22 Displaying Spanning Tree-Related Information for EtherChannels 6-22 7 C H A P T E R Configuring Spanning Tree 7-1 Understanding How STPs Work 7-2 Understanding How a Topology Is Created 7-2 Understanding How a Switch or Port Becomes the Root Switch or Root Port 7-3 Understanding BPDUs 7-4 Calculating and Assigning Port... 7-18 MST Configuration 7-18 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 vi 78-15486-01
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... 12-3 Configuration Guidelines for Dynamic Ports and VMPS 12-3 Configuring VMPS 12-4 Creating the VMPS Database 12-4 Configuring the VMPS Server 12-7 Configuring VMPS Clients 12-8 Monitoring VMPS 12-9 Maintaining VMPS 12-9 Configuring Static Ports 12-10 Troubleshooting VMPS and Dynamic Port VLAN Membership 12-11 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release...
... 12-3 Configuration Guidelines for Dynamic Ports and VMPS 12-3 Configuring VMPS 12-4 Creating the VMPS Database 12-4 Configuring the VMPS Server 12-7 Configuring VMPS Clients 12-8 Monitoring VMPS 12-9 Maintaining VMPS 12-9 Configuring Static Ports 12-10 Troubleshooting VMPS and Dynamic Port VLAN Membership 12-11 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release...
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...Gigabit Ethernet ports. Configuring Protocol Filtering Describes how to configure unicast flood blocking on the switch. Configuring CDP Describes how to configure VLAN Trunking Protocol (VTP) on the switch. xxiv Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software ...Cisco Discovery Protocol (CDP) on the switch. Using Switch TopN Reports Describes how to configure the Switched Port Analyzer (SPAN) and Remote SPAN (RSPAN) on the switch. Configuring SPAN and RSPAN Describes how to generate switch TopN reports on the switch. Configuring VLANs...
...Gigabit Ethernet ports. Configuring Protocol Filtering Describes how to configure unicast flood blocking on the switch. Configuring CDP Describes how to configure VLAN Trunking Protocol (VTP) on the switch. xxiv Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software ...Cisco Discovery Protocol (CDP) on the switch. Using Switch TopN Reports Describes how to configure the Switched Port Analyzer (SPAN) and Remote SPAN (RSPAN) on the switch. Configuring SPAN and RSPAN Describes how to generate switch TopN reports on the switch. Configuring VLANs...
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... in its relevant source address and port ID to the bandwidth. When the destination station replies, the switch adds its address table, it is available. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 4-2 78-15486-01 When the switch receives a frame for a destination... flow in a properly configured switched environment achieve full access to the address table. For Fast Ethernet ports, it is 200 Mbps, and for example, a server) to all ports of the same virtual LAN (VLAN) except the port that stations can transmit and receive...
... in its relevant source address and port ID to the bandwidth. When the destination station replies, the switch adds its address table, it is available. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 4-2 78-15486-01 When the switch receives a frame for a destination... flow in a properly configured switched environment achieve full access to the address table. For Fast Ethernet ports, it is 200 Mbps, and for example, a server) to all ports of the same virtual LAN (VLAN) except the port that stations can transmit and receive...
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... . Configuring Ethernet and Fast Ethernet Ports Chapter 4 Configuring Ethernet and Fast Ethernet Switching This example shows how to set the name for ports 1/1 and 1/2 and how to verify that the port names are configured correctly: Console> (enable) set port name 1/1 Router Connection Port 1/1 name set to high. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 4-4 78...
... . Configuring Ethernet and Fast Ethernet Ports Chapter 4 Configuring Ethernet and Fast Ethernet Switching This example shows how to set the name for ports 1/1 and 1/2 and how to verify that the port names are configured correctly: Console> (enable) set port name 1/1 Router Connection Port 1/1 name set to high. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 4-4 78...
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... the EtherChannel mode for EtherChannel: • Assign all ports in an EtherChannel to the same VLAN, or configure them as an individual port. All ports are pulled down temporarily to cause partner ports to reset. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 6-4 78-15486-01 Configuring ports in an EtherChannel in an EtherChannel as a trunk...
... the EtherChannel mode for EtherChannel: • Assign all ports in an EtherChannel to the same VLAN, or configure them as an individual port. All ports are pulled down temporarily to cause partner ports to reset. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 6-4 78-15486-01 Configuring ports in an EtherChannel in an EtherChannel as a trunk...
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...-related information for EtherChannels, perform this task for all ports that are not channeling are channeling. Command show spantree mod/port These examples show spantree 4/7-8 Port Vlan Port-State Cost Priority Portfast Channel_id 4/7-8 1 blocking 3 32 disabled 770 Console> 6-22 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 Ports that are identified by their...
...-related information for EtherChannels, perform this task for all ports that are not channeling are channeling. Command show spantree mod/port These examples show spantree 4/7-8 Port Vlan Port-State Cost Priority Portfast Channel_id 4/7-8 1 blocking 3 32 disabled 770 Console> 6-22 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 Ports that are identified by their...
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... module • Receives and responds to network management messages Understanding How PVST+ and MISTP Modes Work Catalyst 4500 series switches provide two proprietary spanning tree modes based on the IEEE 802.1D standard and one mode that is virtually nonoperational.... disabled port performs as shown in the disabled state is a combination of the two modes: • Per VLAN Spanning Tree (PVST+) • Rapid PVST+ • Multi-Instance Spanning Tree Protocol (MISTP) • MISTP-PVST+ (combination mode) 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software ...
... module • Receives and responds to network management messages Understanding How PVST+ and MISTP Modes Work Catalyst 4500 series switches provide two proprietary spanning tree modes based on the IEEE 802.1D standard and one mode that is virtually nonoperational.... disabled port performs as shown in the disabled state is a combination of the two modes: • Per VLAN Spanning Tree (PVST+) • Rapid PVST+ • Multi-Instance Spanning Tree Protocol (MISTP) • MISTP-PVST+ (combination mode) 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software ...
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...that identifies the switch. The Catalyst 4500 series switches have a pool of both modes. The last MAC address in the range is 00-e0-1e-9b-31-ff. MAC Address Reduction The MAC address reduction feature is used for example, you can only configure the amount of VLAN ports on your ...network to MISTP, you can use the show module command to view the MAC address range. If you wish to convert your MISTP-PVST+ switches that you configure on Catalyst 6500 series switches to enable extended-range VLAN identification. You can use MISTP-PVST...
...that identifies the switch. The Catalyst 4500 series switches have a pool of both modes. The last MAC address in the range is 00-e0-1e-9b-31-ff. MAC Address Reduction The MAC address reduction feature is used for example, you can only configure the amount of VLAN ports on your ...network to MISTP, you can use the show module command to view the MAC address range. If you wish to convert your MISTP-PVST+ switches that you configure on Catalyst 6500 series switches to enable extended-range VLAN identification. You can use MISTP-PVST...
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...compatibility with 802.1D bridges, as the root of a spanning-tree-connected active topology and assigns port roles to instances or moving VLANs across instances). You configure RSTP when you to reconfigure the active topology of the network when changes ...; An alternate port or backup port role excludes the port from the active topology. 7-16 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 RSTP allows switch port configuration so the ports can exist only where two ports are visible on the port. • ...
...compatibility with 802.1D bridges, as the root of a spanning-tree-connected active topology and assigns port roles to instances or moving VLANs across instances). You configure RSTP when you to reconfigure the active topology of the network when changes ...; An alternate port or backup port role excludes the port from the active topology. 7-16 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 RSTP allows switch port configuration so the ports can exist only where two ports are visible on the port. • ...
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... by one. The nonroot bridges propagate the decremented count as a switch running MST. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 7-21 This example shows the ports simulating PVST: Console> (enable) show spantree mst 3 Spanning tree mode MST Instance 3 VLANs Mapped: 31-40 Designated Root Designated Root Priority Designated Root...
... by one. The nonroot bridges propagate the decremented count as a switch running MST. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 7-21 This example shows the ports simulating PVST: Console> (enable) show spantree mst 3 Spanning tree mode MST Instance 3 VLANs Mapped: 31-40 Designated Root Designated Root Priority Designated Root...
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...sec Forward Delay 15 sec Port Vlan Port-State Cost Prio Portfast Channel_id 1/1 1 not-connected 4 32 disabled 0 1/2 1 not-connected 4 32 disabled 0 2/1 1 not-connected 100 32 disabled 0 2/2 1 not-connected 100 32 disabled 0 7-24 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1... Bridge ID Priority Bridge Max Age 20 sec 00-d0-00-4c-18-00 30000 Hello Time 2 sec Forward Delay 15 sec Port Vlan Port-State Cost Prio Portfast Channel_id 1/1 1 not-connected 4 32 disabled 0 1/2 1 not-connected 4 32 disabled 0 2/1 1...
...sec Forward Delay 15 sec Port Vlan Port-State Cost Prio Portfast Channel_id 1/1 1 not-connected 4 32 disabled 0 1/2 1 not-connected 4 32 disabled 0 2/1 1 not-connected 100 32 disabled 0 2/2 1 not-connected 100 32 disabled 0 7-24 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1... Bridge ID Priority Bridge Max Age 20 sec 00-d0-00-4c-18-00 30000 Hello Time 2 sec Forward Delay 15 sec Port Vlan Port-State Cost Prio Portfast Channel_id 1/1 1 not-connected 4 32 disabled 0 1/2 1 not-connected 4 32 disabled 0 2/1 1...
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... media.The possible range of switch ports. Console> (enable) show spantree mod/port This example shows how to configure the port VLAN priority on a port and verify the configuration: Console> (enable) set spantree portcost 2/3 12 Spantree port 2/3 path cost set spantree portcost {mod/port} cost show spantree 2/3 VLAN 1 . . . 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release...
... media.The possible range of switch ports. Console> (enable) show spantree mod/port This example shows how to configure the port VLAN priority on a port and verify the configuration: Console> (enable) set spantree portcost 2/3 12 Spantree port 2/3 path cost set spantree portcost {mod/port} cost show spantree 2/3 VLAN 1 . . . 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release...
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...the same pathcost default set a cost value from 1- 65535. 7-26 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 You can configure the port cost for different media. When you enable UplinkFast, the actual cost is.... • The short mode has these parameters: - Portcost. - To change the default port cost mode, perform this task in PVST+ is short. Using PVST+ Chapter 7 Configuring Spanning Tree Port Vlan Port-State Cost Prio Portfast Channel_id 1/1 1 not-connected 4 32 disabled 0 1/2 1 not-connected...
...the same pathcost default set a cost value from 1- 65535. 7-26 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 You can configure the port cost for different media. When you enable UplinkFast, the actual cost is.... • The short mode has these parameters: - Portcost. - To change the default port cost mode, perform this task in PVST+ is short. Using PVST+ Chapter 7 Configuring Spanning Tree Port Vlan Port-State Cost Prio Portfast Channel_id 1/1 1 not-connected 4 32 disabled 0 1/2 1 not-connected...
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... port or you will lose the connection to the switch.... Show spanning tree mapping. This display is available only in the MISTP or MISTP-PVST+ mode. To avoid losing connectivity, reduce the number of mappings configured on your switch..., your network could crash if you change from PVST+ to MISTP-PVST+ mode: Console> (enable) set a switch...VLAN ports on your switch to no VLANs mapped to -MISTP instance mapping information propagated from the switch...switch. Once you map a VLAN to an MISTP instance, you can display VLAN-... so from the root switch at runtime. This section...
... port or you will lose the connection to the switch.... Show spanning tree mapping. This display is available only in the MISTP or MISTP-PVST+ mode. To avoid losing connectivity, reduce the number of mappings configured on your switch..., your network could crash if you change from PVST+ to MISTP-PVST+ mode: Console> (enable) set a switch...VLAN ports on your switch to no VLANs mapped to -MISTP instance mapping information propagated from the switch...switch. Once you map a VLAN to an MISTP instance, you can display VLAN-... so from the root switch at runtime. This section...
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...switch on an MISTP instance when the switch is associated with the switch) below the default (32,768); To unmap a VLAN or all of the VLANs mapped to which they are flooded. Configuring a Primary Root Switch You can then become the root switch. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches... state of the VLAN (if the VLAN exists) is used to unmap the specified VLANs from the MISTP instances to it have all VLANs from becoming a root switch using the root guard feature. Command set spantree disable mistp-instance instance [all the ports of all ] This...
...switch on an MISTP instance when the switch is associated with the switch) below the default (32,768); To unmap a VLAN or all of the VLANs mapped to which they are flooded. Configuring a Primary Root Switch You can then become the root switch. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches... state of the VLAN (if the VLAN exists) is used to unmap the specified VLANs from the MISTP instances to it have all VLANs from becoming a root switch using the root guard feature. Command set spantree disable mistp-instance instance [all the ports of all ] This...
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... mst config {[name name] | [revision number] [commit | rollback | force]} Verify your MST module and port configuration. show spantree mst config Map VLANs to enable MST: Console> (enable) Console> (enable) set spantree mode pvst Spantree mode set spantree mode mst... Hello Time 2 sec Forward Delay 15 sec Port Vlan Port-State Cost Prio Portfast Channel_id ---------- 6/1 1 forwarding 4 32 disabled 0 6/2 1 blocking 4 32 disabled 0 Console> (enable) 7-46 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 set...
... mst config {[name name] | [revision number] [commit | rollback | force]} Verify your MST module and port configuration. show spantree mst config Map VLANs to enable MST: Console> (enable) Console> (enable) set spantree mode pvst Spantree mode set spantree mode mst... Hello Time 2 sec Forward Delay 15 sec Port Vlan Port-State Cost Prio Portfast Channel_id ---------- 6/1 1 forwarding 4 32 disabled 0 6/2 1 blocking 4 32 disabled 0 Console> (enable) 7-46 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 set...
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..., (Configured) Auto Port Guard: Default Boundary: Yes (PVST) Inst State Role Cost Prio VLANs 0 forwarding ROOT 10000 32 1 1 forwarding BDRY 10000 32 2-20 2 forwarding BDRY 10000 32 21-30 3 forwarding BDRY 10000 32 31-40 4 forwarding BDRY 10000 32 41-50 Console> (enable) 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration...
..., (Configured) Auto Port Guard: Default Boundary: Yes (PVST) Inst State Role Cost Prio VLANs 0 forwarding ROOT 10000 32 1 1 forwarding BDRY 10000 32 2-20 2 forwarding BDRY 10000 32 21-30 3 forwarding BDRY 10000 32 31-40 4 forwarding BDRY 10000 32 41-50 Console> (enable) 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration...
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... shows the output of connected spanning tree ports by vlan VLAN Blocking Listening Learning Forwarding STP Active 1 6 4 2 0 12 7-58 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 Summary of the show spantree summary command: Console> (enable) show spantree bpdu-skewing 1 8/4 Bpdu skewing statistics for vlan 1 Port Last Skew ms Worst Skew ms...
... shows the output of connected spanning tree ports by vlan VLAN Blocking Listening Learning Forwarding STP Active 1 6 4 2 0 12 7-58 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01 Summary of the show spantree summary command: Console> (enable) show spantree bpdu-skewing 1 8/4 Bpdu skewing statistics for vlan 1 Port Last Skew ms Worst Skew ms...
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... receiving BPDUs, the loop guard feature puts the port into an inconsistent state until it is automatically applied to all of the active instances or VLANs to become designated as root if BPDUs are in MST mode, you can enable loop guard on a channel and ... from the channel. Some software failures may cause a root port or alternate port to which that you are absent. Loop guard isolates the failure and lets spanning tree converge to the listening state. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-6 78-15486-01 When you...
... receiving BPDUs, the loop guard feature puts the port into an inconsistent state until it is automatically applied to all of the active instances or VLANs to become designated as root if BPDUs are in MST mode, you can enable loop guard on a channel and ... from the channel. Some software failures may cause a root port or alternate port to which that you are absent. Loop guard isolates the failure and lets spanning tree converge to the listening state. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-6 78-15486-01 When you...