spanning-tree summary output

Unanswered Question
Nov 16th, 2009

Name Blocking Listening Learning Forwarding STP Active

---------------------- -------- --------- -------- ---------- ----------

21 vlans 4 0 0 127 131

This is the some of the output of

show spanning-tree summary total.

What does this indicates?

We have in all 21 VLAN configured on this switch. Are these numbers too drastic as I have no idea about what these numbers indicate. ( Forwarding and STP active )

Please share the experience.

Any link on is highly appreciable.

Thanks in advance.


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Overall Rating: 5 (2 ratings)
Ganesh Hariharan Mon, 11/16/2009 - 19:20

Following output specifies in your switch 21 vlans are configured out of which 127 ports are in forwarding state,4 are in blocking state and on 131 ports stp is active.



Muhammad Anser Khan Mon, 11/16/2009 - 23:11

I think this output belongs to the ROOT BRIDGE.

Check which vlans are in the blocking state by:

#show spanning-tree summary

May be some on your Vlans are in " *PVID_Inc " check by giving the following commands:

#sh spanning-tree vlan 1 (check those vlans which are in blocking state)


#sh spanning-tree inconsistentports

Can you post with the outputs?




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