Cisco Catalyst 3550

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Catalyst 3550 Multilayer Switch Command Reference
OL-8566-01
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands
show spanning-tree
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 0008.205e.6600
Configured hello time 2, max age 20, forward delay 15
Current root has priority 20481, address 0008.217a.5800
Root port is 1 (GigabitEthernet0/1), cost of root path is 38
Topology change flag not set, detected flag not set
Number of topology changes 0 last change occurred 3w0d ago
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 20481, address 0008.217a.5800
Designated bridge has priority 65535, address 0050.2aed.5c80
Designated port id is 128.26, designated path cost 19
Timers: message age 3, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 0, received 947349
<output truncated>
This is an example of output from the show spanning-tree interface fastethernet0/1 command:
Switch> show spanning-tree interface fastethernet0/1
Vlan Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
VLAN0001 Root FWD 19 128.1 P2p
This is an example of output from the show spanning-tree summary command:
Switch> show spanning-tree summary
Switch is in pvst mode
Root bridge for: none
EtherChannel misconfiguration guard is enabled
Extended system ID is enabled
Portfast is disabled by default
PortFast BPDU Guard is disabled by default
Portfast BPDU Filter is disabled by default
Loopguard is disabled by default
UplinkFast is disabled
BackboneFast is disabled
Pathcost method used is short
Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0001 0 0 0 1 1
---------------------- -------- --------- -------- ---------- ----------
1 vlan 0 0 0 1 1
<output truncated>
This is an example of output from the show spanning-tree mst configuration command:
Switch# show spanning-tree mst configuration
Name [region1]
Revision 1
Instance Vlans mapped