Reference Guide

894 | Spanning Tree Protocol (STP)
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Figure 50-5. show spanning-tree 0 Command Example
Confirm that a port is participating in Spanning Tree using the show spanning-tree 0 brief command from
EXEC privilege mode.
Figure 50-6. show spanning-tree brief Command Example
Dell#show spanning-tree 0
Executing IEEE compatible Spanning Tree Protocol
Bridge Identifier has priority 32768, address 0001.e826.ddb7
Configured hello time 2, max age 20, forward delay 15
Bpdu filter disabled globally
Current root has priority 32768, address 0001.e80d.2462
Root Port is 289 (Tengigabitethernet 2/1), cost of root path is 4
Topology change flag not set, detected flag not set
Number of topology changes 3 last change occurred 0:16:11 ago
from Tengigabitethernet 2/3
Timers: hold 1, topology change 35
hello 2, max age 20, forward delay 15
Times: hello 0, topology change 0, notification 0, aging Normal
Port 289 (Tengigabitethernet 2/1) is Forwarding
Port path cost 4, Port priority 8, Port Identifier 8.289
Designated root has priority 32768, address 0001.e80d.2462
Designated bridge has priority 32768, address 0001.e80d.2462
Designated port id is 8.496, 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
Port 290 (Tengigabitethernet 2/2) is Blocking
Port path cost 4, Port priority 8, Port Identifier 8.290
Dell#
Dell#show spanning-tree 0 brief
Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 32768, Address 0001.e80d.2462
We are the root of the spanning tree
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 32768, Address 0001.e80d.2462
Configured hello time 2, max age 20, forward delay 15
Bpdu filter disabled globally
Interface Designated
Name PortID Prio Cost Sts Cost Bridge ID PortID
-------------- ------ ---- ---- --- ----- ----------------- ------
Tengig 1/1 8.496 8 4 DIS 0 32768 0001.e80d.2462 8.496
Tengig 1/2 8.497 8 4 DIS 0 32768 0001.e80d.2462 8.497
Tengig 1/3 8.513 8 4 FWD 0 32768 0001.e80d.2462 8.513
Tengig 1/4 8.514 8 4 FWD 0 32768 0001.e80d.2462 8.514
Dell#