Cross Stack Etherchannel for 3750 12S

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Feb 16th, 2010
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Hi,


I am looking at an issue with a cross stack etherchannel running LACP. Member port g1/0/1 of the bundle is changing state frequently without any known cause.


The two stacks are made of 1x Cisco 3750 12S and 1x Cisco 3750 E 24.


G1/0/1 on the 12S connects to G1/0/1 on the other 12S SFP.

G2/0/1 on the E connects to G 2/0/1 on the other E using copper.


Interface G1/0/1 is flapping. Bundle is active and passing traffic.


Anyone seen this combination?

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Leo Laohoo Wed, 10/06/2010 - 14:54
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Have you changed the Gi1/0/1 fibre optic cable and/or SFP that connects the two 3750G-12S?

Reza Sharifi Wed, 10/06/2010 - 15:06
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I agree with Leo,


You may have a bad fiber patch cable or a bad SFP.


Reza

kimtoovey Wed, 10/06/2010 - 17:06
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Thanks for the advice.


I had changed the SFP and the Fibre cabling. I eneded up having to move the link to an alternate slot on the 12S.


Might need to get a TAC raised.


Thanks again.

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