Catalyst 3750x switch stack experiencing stack port flapping issue

[Rich Mauger]

Has anyone else come across this issue? I've ensured all the cables are secured, but it looks more like a "caveat/bug" to me. I'm not having any performance hits on this, but it's killing my syslog server. Switch shows all stack ports are up, ok and operating in full bandwidth. I rebooted the switch over the weekend, but to no avail. Error msg returned after an hour. I'm thinking about moving to c3750e-universalk9-mz.150-2.SE8.bin. Any thoughts on this one?

Currently running the following:

QTY: 4

Model: WS-C3750X-48PF-L 

Image: c3750e-universalk9-mz.150-2.SE6.bin

syslog:

<snip>

000629: Aug 17 10:54:02.465 PDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state UP
000630: Aug 17 10:54:52.459 PDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
000631: Aug 17 10:54:53.458 PDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP
000632: Aug 17 10:55:08.447 PDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state DOWN
000633: Aug 17 10:55:09.471 PDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state UP
000634: Aug 17 11:08:56.435 PDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
000635: Aug 17 11:08:57.434 PDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP
000636: Aug 17 11:09:23.412 PDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state DOWN
000637: Aug 17 11:09:23.420 PDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
000638: Aug 17 11:09:24.419 PDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state UP
000639: Aug 17 11:09:24.452 PDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP
000640: Aug 17 11:13:26.411 PDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
000641: Aug 17 11:13:27.410 PDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP

switchname#  sh switch detail
Switch/Stack Mac Address : c89c.1d1c.5400
Mac persistency wait time: Indefinite
                                           H/W   Current
Switch#  Role   Mac Address     Priority Version  State
----------------------------------------------------------
*1       Master c89c.1d1c.5400     15     3       Ready
 2       Member 4403.a7f7.e000     1      3       Ready
 3       Member 4403.a7e0.5980     1      3       Ready
 4       Member 4403.a7f8.c380     10     3       Ready

         Stack Port Status             Neighbors
Switch#  Port 1     Port 2           Port 1   Port 2
--------------------------------------------------------
  1        Ok         Ok                2        4
  2        Ok         Ok                3        1
  3        Ok         Ok                4        2
  4        Ok         Ok                1        3

swtichname#sh switch stack-ring speed

Stack Ring Speed        : 32G
Stack Ring Configuration: Full
Stack Ring Protocol     : StackWisePlus

[Reza Sharifi]

Before you upgrade to the new IOS version, open ticket with TAC and send them the logs.  The may have other customers with the same issue and can recommend the right version to upgrade to.

HTH

[Anthony Filice]

I have the same issue and I am running almost the exact same ver as you. Mine only happen during certain times of the day periodically but they are starting to show a pattern - doesnt happen all day which I have had an actual cable issue - I am thinking a bug or the cable length..but im about to replace cables on side of caution

Aug 27 12:45:41.471: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
Aug 27 12:45:42.486: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP
Aug 27 14:59:29.872: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
Aug 27 14:59:30.878: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP
Aug 27 15:50:28.475: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state DOWN
Aug 27 15:50:29.490: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state UP
Aug 27 16:02:50.256: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
Aug 27 16:02:51.279: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP
Aug 31 12:02:46.975: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state DOWN
Aug 31 12:02:47.982: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state UP
Aug 31 14:25:36.067: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
Aug 31 14:25:37.074: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP
Aug 31 14:45:49.977: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state DOWN
Aug 31 14:45:50.992: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state UP
Aug 31 15:07:02.587: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state DOWN
Aug 31 15:07:03.594: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state UP
Aug 31 15:34:02.611: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state DOWN
Aug 31 15:34:03.617: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state UP
Aug 31 15:41:57.824: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state DOWN
Aug 31 15:41:58.831: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state UP
Aug 31 16:06:23.663: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state DOWN
Aug 31 16:06:24.670: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state UP
Aug 31 16:20:56.560: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state DOWN
Aug 31 16:20:57.567: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state UP
Aug 31 17:04:30.658: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
Aug 31 17:04:31.673: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP
Aug 31 17:33:07.723: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state DOWN
Aug 31 17:33:08.730: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state UP
Sep  1 12:00:02.802: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
Sep  1 12:00:03.808: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP
Sep  1 12:01:49.902: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state DOWN
Sep  1 12:01:50.900: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state UP
Sep  1 12:37:39.162: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
Sep  1 12:37:40.185: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP
Sep  1 14:25:27.968: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state DOWN
Sep  1 14:25:28.975: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 6 has changed to state UP

Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 12.2(55)SE3, RELEASE SOFTWARE (fc1)

BLO3750-CORE#show switch DET
Switch/Stack Mac Address : 30f7.0def.6680
                                           H/W   Current
Switch#  Role   Mac Address     Priority Version  State
----------------------------------------------------------
*1       Master 30f7.0def.6680     1      1       Ready
 2       Member 7cad.748a.3200     1      1       Ready
 3       Member 0000.0000.0000     0      0       Provisioned
 4       Member 0000.0000.0000     0      0       Provisioned
 5       Member 0011.9382.5400     1      0       Ready
 6       Member 0011.9382.4700     1      0       Ready

         Stack Port Status             Neighbors
Switch#  Port 1     Port 2           Port 1   Port 2
--------------------------------------------------------
  1        Ok         Ok                6        2
  2        Ok         Ok                1        5
  5        Ok         Ok                2        6
  6        Ok         Ok                5        1

BLO3750-CORE#show swit
BLO3750-CORE#show switch st
BLO3750-CORE#show switch stack-po
BLO3750-CORE#show switch stack-ports sum

Switch#/  Stack   Neighbor   Cable    Link   Link   Sync      #         In
 Port#     Port              Length    OK   Active   OK    Changes   Loopback
          Status                                          To LinkOK
--------  ------  --------  --------  ----  ------  ----  ---------  --------
  1/1     OK         6      50 cm     Yes    Yes    Yes     4486        No
  1/2     OK         2      50 cm     Yes    Yes    Yes        1        No
  2/1     OK         1      50 cm     Yes    Yes    Yes        1        No
  2/2     OK         5      3 m       Yes    Yes    Yes        2        No
  5/1     OK         2      3 m       Yes    Yes    Yes        2        No
  5/2     OK         6      3 m       Yes    Yes    Yes       10        No
  6/1     OK         5      3 m       Yes    Yes    Yes       10        No
  6/2     OK         1      50 cm     Yes    Yes    Yes     4486        No