07-09-2007 10:14 PM - edited 03-05-2019 05:12 PM
Hi,
we have just discovered some error messages indicating stack port flapping.
we have swapped stack cable, but error messages wouldn't stop.
It is a 2 x 3750 cisco switches stack, and it has been up and running for quite a while. The redundant stack port is also working fine.
error messages look like this:
Jul 10 16:07:48.903: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has ch
anged to state UP
Jul 10 16:07:50.455: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has ch
anged to state UP
Jul 10 16:07:51.462: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has ch
anged to state DOWN
Jul 10 16:07:51.923: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has ch
anged to state DOWN
Jul 10 16:07:52.469: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has ch
anged to state UP
I searched on cisco website but didn't seem to find any solutions to it.
Any input would be much appreciated.
Cheers,
YingJie
07-10-2007 02:54 AM
The error message means that one of the stack connections is flapping,going up-down constantly.
According with the messages, the connection we are having problems with is the one between switch 1 stacking port 1 and switch 2 stacking port 2. This error message could be caused by a faulty stacking cable or a faulty stacking oort. If possible, I would like you to remove the stacking cable connected on these ports and then clear the log and verify if the message stops. Then, if you had a spare stacking cable,it would be a good idea to try it out.
If you do not have a spare cable, in order to determine if the problem is with the cable or the a stacking port it self, we would need to swap the stacking cables around, and if the error message now points to the other two ports, it would be definitively a problem with the stacking port itself.
HTH,Please rate if it does.
-amit singh
07-10-2007 06:36 PM
Hi Amit,
Thanks for the reply.
- I have swapped a brand new cable, error persists.
- Did what u suggested... removed the cable and error did stop... however, isn't this expected because nothing was plugged into the port hence it wouldn't bother checking?
cheers
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