Cisco Catalyst 4500 Series Command Reference Manual page 986

show spanning-tree
Spanning tree enabled protocol ieee
Root ID
Bridge ID
Interface
Name
-------------------
FastEthernet6/15
VLAN2
Spanning tree enabled protocol ieee
Root ID
Bridge ID
Interface
Name
-------------------
FastEthernet6/16
Switch#
This example shows how to display spanning-tree information for Fast Ethernet interface 5/9:
Switch# show spanning-tree interface fastethernet5/9
Interface Fa0/10 (port 23) in Spanning tree 1 is ROOT-INCONSISTENT
Port path cost 100, Port priority 128
Designated root has priority 8192, address 0090.0c71.a400
Designated bridge has priority 32768, address 00e0.1e9f.8940
Designated port is 23, path cost 115
Timers: message age 0, forward delay 0, hold 0
BPDU: sent 0, received 0
The port is in the portfast mode
Switch#
This example shows how to display spanning-tree information for a specific VLAN:
Switch# show spanning-tree vlan 1
VLAN1 is executing the ieee compatible Spanning Tree protocol
Bridge Identifier has priority 32768, address 0030.94fc.0a00
Configured hello time 2, max age 20, forward delay 15
We are the root of the spanning tree
Topology change flag not set, detected flag not set
Number of topology changes 5 last change occurred 01:50:47 ago
Times: hold 1, topology change 35, notification 2
Timers:hello 0, topology change 0, notification 0, aging 300
Port 335 (FastEthernet6/15) of VLAN1 is forwarding
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
2-928
Priority 32768
Address 0030.94fc.0a00
This bridge is the root
Hello Time 2 sec
Priority 32768
Address 0030.94fc.0a00
Hello Time 2 sec
Aging Time 300
Port ID Prio
------- --- ------ ---
129.79 128
Priority 32768
Address 0030.94fc.0a01
This bridge is the root
Hello Time 2 sec
Priority 32768
Address 0030.94fc.0a01
Hello Time 2 sec
Aging Time 300
Port ID Prio
------- --- ------ ---
129.80 128
from FastEthernet6/16
hello 2, max age 20, forward delay 15
Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
Max Age 20 sec Forward Delay 15 sec
Max Age 20 sec Forward Delay 15 sec
Designated
Cost Sts Cost Bridge ID
---- -------------------- -------
19 FWD 0 32768 0030.94fc.0a00 129.79
Max Age 20 sec Forward Delay 15 sec
Max Age 20 sec Forward Delay 15 sec
Designated
Cost Sts Cost Bridge ID
---- -------------------- -------
19 FWD 0 32768 0030.94fc.0a01 129.80
Port ID
Port ID
OL-27596 -01