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marc.mvh.vanhoof
Beginner

Flapping ports in a CISCO MDS 9710 Portchannel

Last week we had some issues with ports going up and down during some DWDM infrastructure maintenance. One of two dark fibers was disconnected due to some maintenance in the field/street by the provider. It seems during restoring the dark fiber to normal, a lot port up messages were seen (> 20). In DCNM we also can see a lot of errors and discards. Our question is, should we better do a clean stop of the ISL's/MDS ports before work can start by the provider? Then wait for a final go to restart the ISL's/MDS ports ?

Both dark fibers were spread over 2 FABRIC's. Each fabric does have a portchannel containing 50% ISL's of each dark fiber.

Shouldn't the portchannel take care of all the errors seen, mask them for the applications ? Can one config some setting on port-level to avoid flapping port  

Many Thanks upfront 

 

 

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