Show Spanning-Tree Command on CISCO Router/Switch

Command

Show Spanning-Tree

Use

Displays the spanning tree configuration on the switch.

Syntax

Switch#show spanning-tree

Example

In this example, the spanning tree configuration for VLAN 1 is displayed on SW3.

SW3#show spanning-tree vlan 1VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 0018.b973.fc80
Cost 19
Port 25 (FastEthernet0/23)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 secBridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 0019.060c.9400
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
—————- —- — ——— ——– ——————————–
Fa0/10 Desg FWD 19 128.12 P2p
Fa0/11 Desg FWD 19 128.13 P2p
Fa0/12 Desg FWD 19 128.14 P2p
Fa0/13 Desg FWD 19 128.15 P2p
Fa0/19 Altn BLK 19 128.21 P2p
Fa0/20 Altn BLK 19 128.22 P2p
Fa0/23 Root FWD 19 128.25 P2p

Interface Role Sts Cost Prio.Nbr Type
—————- —- — ——— ——– ——————————–

Fa0/24 Altn BLK 19 128.26 P2p

SW3#

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