Reference Guide

Spanning Tree Protocol (STP) | 897
Figure 49-4. Spanning Tree Enabled Globally
View the Spanning Tree configuration and the interfaces that are participating in STP using the show
spanning-tree 0
command from EXEC privilege mode. If a physical interface is part of a port channel, only
the port channel is listed in the command output.
R1
R2
R3
1/3
3/1
3/2
3/4
3/3
1/4
1/1 1/2
2/1
2/2
2/3
2/4
Port 290 (GigabitEthernet 2/4) is Blocking
Port path cost 4, Port priority 8, Port Identifier 8.290
Designated root has priority 32768, address 0001.e80d.2462
Designated bridge has priority 32768, address 0001.e80d.2462
Designated port id is 8.497, designated path cost 0
Timers: message age 1, forward delay 0, hold 0
Number of transitions to forwarding state 1
BPDU: sent 21, received 486
The port is not in the portfast mode
root
Forwarding
Blocking