Specifications

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Catalyst 2950 and Catalyst 2955 Switch Command Reference
78-15304-01
Chapter 2 Cisco IOS Commands
show spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32768
Address 0001.4297.e000
Cost 57
Port 1 (GigabitEthernet0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 0002.4b29.7a00
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Port ID Designated Port ID
Name Prio.Nbr Cost Sts Cost Bridge ID Prio.Nbr
---------------- -------- --------- --- --------- -------------------- --------
Gi0/1 128.1 19 FWD 38 32768 0030.9441.62c1 128.25
Gi0/2 128.2 19 FWD 57 32769 0002.4b29.7a00 128.2
Po1 128.65 19 FWD 57 32769 0002.4b29.7a00 128.65
This is an example of output from the show spanning-tree detail command:
Switch> show spanning-tree detail
VLAN0001 is executing the ieee compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 1, address 0002.4b29.7a00
Configured hello time 2, max age 20, forward delay 15
Current root has priority 32768, address 0001.4297.e000
Root port is 1 (GigabitEthernet0/1), cost of root path is 57
Topology change flag not set, detected flag not set
Number of topology changes 2 last change occurred 2d18h ago
from Port-channel1
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Timers: hello 0, topology change 0, notification 0, aging 300
Port 1 (GigabitEthernet0/1) of VLAN0001 is forwarding
Port path cost 19, Port priority 128, Port Identifier 128.1.
Designated root has priority 32768, address 0001.4297.e000
Designated bridge has priority 32768, address 0030.9441.62c1
Designated port id is 128.25, designated path cost 38
Timers: message age 4, forward delay 0, hold 0
Number of transitions to forwarding state: 1
BPDU: sent 2, received 120638
<output truncated>
This is an example of output from the show spanning-tree interface fastethernet 0/1 command:
Switch> show spanning-tree interface fastethernet0/1
Vlan Port ID Designated Port ID
Name Prio.Nbr Cost Sts Cost Bridge ID Prio.Nbr
---------------- -------- --------- --- --------- -------------------- --------
VLAN0001 128.1 19 FWD 38 32768 0030.9441.62c1 128.25