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Port-channel went down

Hi All,

We have huge fabirc contain 2 director based switches and 30 number of blade enclosure switches.

Each director calss switches connected with 15 switches and interconnect with each other with 8 * 2 GB ISL trunk.

Recent past, one of the 8 ISL (Port-channl) gone down whereas 7 link were up and working.

Then all the port-channel on one of the Director switches went down (shown down state) due to whcih half of the fabric was down.

And the above issue was not seen on DCNM GUI screen, and we could analyze the issue when we have logged into the san switch CLI.

COuld anyone suggest which could cause this major issue, like single ISL issue causes the whole fabric to go down.

Thanks in advance. your quick answers will be much appreciated.            

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