showing blocking ports

[lcaruso]

Hi,

On a 3750 running latest IOS, what is the command that shows which ports are blocking with spanning-tree?

Thanks.

[Reza Sharifi · Accepted solution]

Hi,

try this command:

show spanning-tree summary

[lcaruso]

Thanks!

[glen.grant · Accepted solution]

Use "show spanning-tree blockedports"

[lcaruso]

thanks to all who replied. now I know port 1 is being blocked due to stp

how do I find the port on this same switch that is providing an active path to other switches?

[Kishore Chennupati · Accepted solution]

Hi lcaruso.

Glen is right. "sh spanning-tree blocked-ports " shows you what PORTS  are blocked.

"sh spanning tree summary" shows you info about what VLANS have been blocked/forwarded etc  but not the ports.

HTH

Regards

Kishore