Cisco Catalyst 3550 Command Reference Manual page 386

show spanning-tree
Usage Guidelines
If the vlan-id variable is omitted, the command applies to the spanning-tree instance for all VLANs.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output
do not appear, but the lines that contain Output appear.
Examples This is an example of output from the show spanning-tree active command:
Switch# show spanning-tree active
VLAN0001
Spanning tree enabled protocol ieee
Root ID
Bridge ID
Interface
---------------- ---- --- --------- -------- --------------------------------
Gi0/1
This is an example of output from the show spanning-tree detail command:
Switch> show spanning-tree detail
VLAN0001 is executing the ieee compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 1, address 0008.205e.6600
Configured hello time 2, max age 20, forward delay 15
Current root has priority 20481, address 0008.217a.5800
Root port is 1 (GigabitEthernet0/1), cost of root path is 38
Topology change flag not set, detected flag not set
Number of topology changes 0 last change occurred 3w0d ago
Times:
Timers: hello 0, topology change 0, notification 0, aging 300
Port 1 (GigabitEthernet0/1) of VLAN0001 is forwarding
Port path cost 19, Port priority 128, Port Identifier 128.1.
Designated root has priority 20481, address 0008.217a.5800
Designated bridge has priority 65535, address 0050.2aed.5c80
Designated port id is 128.26, designated path cost 19
Timers: message age 3, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 0, received 947349
<output truncated>
Catalyst 3550 Multilayer Switch Command Reference
2-360
Priority 20481
Address 0008.217a.5800
Cost 38
Port 1 (GigabitEthernet0/1)
Hello Time 2 sec
Priority 32769 (priority 32768 sys-id-ext 1)
Address 0008.205e.6600
Hello Time 2 sec
Aging Time 300
Role Sts Cost
Root FWD 19
hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Max Age 20 sec Forward Delay 15 sec
Max Age 20 sec Forward Delay 15 sec
Prio.Nbr Type
128.1 P2p
Chapter 2 Cisco IOS Commands
78-11195-09