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902 | Rapid Spanning Tree Protocol
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Figure 44-3. Verifying RSTP is Enabled
When you enable Rapid Spanning Tree, all physical and port-channel interfaces that are enabled and in
Layer 2 mode are automatically part of the RST topology.
• Only one path from any bridge to any other bridge is enabled.
• Bridges block a redundant path by disabling one of the link ports.
Figure 44-4. 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.
FTOS(conf-rstp)#show config
!
protocol spanning-tree rstp
no disable
FTOS(conf-rstp)#
Indicates that Rapid Spanning Tree is enabled
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