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
-------- ---------------------------------------------------------------------
0 101-4094
1 1-100
-------------------------------------------------------------------------------
This is an example of output from the show spanning-tree mst interface fastethernet0/1 command:
Switch# show spanning-tree mst interface fastethernet0/1
FastEthernet0/1 of MST00 is designated forwarding
Edge port:no (default) port guard :none (default)
Link type:point-to-point (auto) bpdu filter:disable (default)
Boundary :internal bpdu guard :disable (default)
Bpdus sent 84122, received 83933
Instance Role Sts Cost Prio.Nbr Vlans mapped
-------- ---- --- --------- -------- -------------------------------
0 Desg FWD 200000 128.1 101-4094
1 Root FWD 200000 128.1 1-100
This is an example of output from the show spanning-tree mst 0 command:
Switch# show spanning-tree mst 0
###### MST00 vlans mapped: 101-4094
Bridge address 0005.7428.1f40 priority 32768 (32768 sysid 0)
Root address 0001.42e2.cdc6 priority 32768 (32768 sysid 0)
port Gi0/2 path cost 200038
IST master this switch
Operational hello time 2, forward delay 15, max age 20
Configured hello time 2, forward delay 15, max age 20, max hops 20
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Gi0/1 Desg FWD 200000 128.1 P2p
Gi0/2 Root FWD 200000 128.2 P2p Bound(PVST)
Gi0/5 Desg FWD 200000 128.5 P2p
Related Commands Command Description
clear spanning-tree counters Clears the spanning-tree counters.
clear spanning-tree detected-protocols Restarts the protocol migration process.
spanning-tree backbonefast Enables the BackboneFast feature.
spanning-tree bpdufilter Prevents a port from sending or receiving bridge protocol
data units (BPDUs).
spanning-tree bpduguard Puts a port in the error-disabled state when it receives a
BPDU.
spanning-tree cost Sets the path cost for spanning-tree calculations.
spanning-tree extend system-id Enables the extended system ID feature.
spanning-tree guard Enables the root guard or the loop guard feature for all the
VLANs associated with the selected interface.
spanning-tree link-type Overrides the default link-type setting for rapid
spanning-tree transitions to the forwarding state.
spanning-tree loopguard default Prevents alternate or root ports from becoming the
designated port because of a failure that leads to a
unidirectional link.