Reference Guide

Rapid Spanning Tree Protocol (RSTP) | 769
Figure 38-4. Rapid Spanning Tree Enabled Globally
View the interfaces participating in Rapid Spanning Tree using the show spanning-tree rstp 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 684 (GigabitEthernet 4/43) is alternate Discarding
Discarding
Port path cost 20000, Port priority 128, Port Identifier 128.684
Designated root has priority 32768, address 0001.e801.cbb4
Designated bridge has priority 32768, address 0001.e801.cbb4
Designated port id is 128.684, designated path cost 20000
Number of transitions to forwarding state 0
BPDU : sent 3, received 219
The port is not in the Edge port mode
root
Forwarding
Blocking