STP on a 3750

Unanswered Question
Feb 5th, 2008

One of the data ports is flashing amber. The installation guide says "Port is blocked by STP and is sending or receiving packets"

Can you exlain what this means, as it doesn't make sense for a blocked port to be receiving/sending packets.

I have this problem too.
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shrikar.dange Tue, 02/05/2008 - 02:59


AFAIK the blocked port can recieve BPDUs.Can you post the sh interface output?


shri :)

kswonnell Tue, 02/05/2008 - 03:06

I agree that the port can receive BPDUs, but that is not the case here; we are receiving Data Packets(frames).What is the logic behind that ?

aijaz802 Tue, 02/05/2008 - 02:59


I think the access port might be receiving BPDU packets and the switch is blocking the port for few seconds and enabling it (errdisable recovery) and again blocks it as soon as it receives the next BPDU packet.

U can disable the BPDU guard on port or in global config mode.

Rate if this helps...



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