Installation guide

Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards
How to Configure EtherSwitch HWICs
27
Cisco IOS Release 12.3(8)T4
OL-6454-01
Enabling Spanning Tree
You can enable spanning tree on a per-VLAN basis. The switch maintains a separate instance of
spanning tree for each VLAN (except on VLANs on which you disable spanning tree).
To enable spanning tree on a per-VLAN basis, use the following command in global configuration mode:
Verifying Spanning Tree
Use the show spanning-tree vlan to verify spanning tree configuration, as illustrated below:
Router# show spanning-tree vlan 200
VLAN200 is executing the ieee compatible Spanning Tree protocol
Bridge Identifier has priority 32768, address 0050.3e8d.6401
Configured hello time 2, max age 20, forward delay 15
Current root has priority 16384, address 0060.704c.7000
Root port is 264 (FastEthernet0/1/8), cost of root path is 38
Topology change flag not set, detected flag not set
Number of topology changes 0 last change occurred 01:53:48 ago
Times: hold 1, topology change 24, notification 2
hello 2, max age 14, forward delay 10
Timers: hello 0, topology change 0, notification 0
Port 264 (FastEthernet0/1/8) of VLAN200 is forwarding
Port path cost 19, Port priority 128, Port Identifier 129.9.
Designated root has priority 16384, address 0060.704c.7000
Designated bridge has priority 32768, address 00e0.4fac.b000
Designated port id is 128.2, designated path cost 19
Timers: message age 3, forward delay 0, hold 0
Number of transitions to forwarding state: 1
BPDU: sent 3, received 3417
Router#
Configuring Spanning Tree Port Priority
Beginning in global configuration mode, follow these steps to configure the spanning tree port priority
of an interface.
SUMMARY STEPS
1. interface {{ethernet | fastethernet} interface-id
2. [no] spanning-tree port-priority port _ priority
3. [no] spanning-tree vlan vlan _ ID port-priority port _ priority
4. end
Command Purpose
Router(config)# spanning-tree vlan vlan _ ID
Enables spanning tree on a per-VLAN basis.