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Cisco Bug: CSCun29064 - 3850/3650 stack-port is incorrectly down

Last Modified

Sep 01, 2020

Products (1)

  • Cisco Catalyst 3650 Series Switches

Known Affected Releases

15.2(3.1.22)PI4 15.4(2.1)T

Description (partial)

Symptom:
The Stack Ports show as  down even when it should be up and running.
 
3650#show switch neigh
   Switch #    Port 1       Port 2
   --------    ------       ------
       1        None           2
       2         1             1
 
 3650#show switch stack-ports summ
 
 Sw#/Port#  Port Status  Neighbor  Cable Length   Link OK   Link Active   Sync OK   #Changes to LinkOK  In Loopback
 -------------------------------------------------------------------------------------------------------------------
 1/1        DOWN         NONE      100cm          Yes       No            Yes       2                   No
 1/2        OK           2         100cm          Yes       Yes           Yes       1                   No
 2/1        OK           1         100cm          Yes       Yes           Yes       1                   No
 2/2        OK           1         100cm          Yes       Yes           Yes       2                   No

Conditions:
3850 or 3650 running any code prior to 03.06.02/03.07.00
Can occur on boot up, or if the switch stack interface is disconnected and re-connected.

Related Community Discussions

4500X stacks occasionally unreachable
We have several remote site where we have replaced 4506 switches with a stack of two 4500Xs as the site's core switch. They have been working OK for the most part, but we are constantly seeing them unreachable for a few minutes. It happens maybe 2 or 3 times a day and it's happening to different ones each time. When they come up, nothing in the logs seems to indicate there was a problem. I don't see errors on ports, and checking the EIGRP neighbor I don't see any indication that the neighbor relationship ...
Latest activity: Feb 24, 2016
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