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3750 Switch Stacking Problem

Hi, We have problem with one of our 3750 stack switch, stack connection between switch 2 & 3 is now down and not comming up even after replacing stack cable with new one. Please let me know if you have got any ideas. below output for your reference:

------------------ show switch detail ------------------

                                               Current

Switch#  Role      Mac Address     Priority     State

--------------------------------------------------------

*1       Master    000f.f7f4.ce00     10        Ready              

2       Member    000f.2425.cf00     1         Ready              

3       Member    000f.f7f4.fe00     5         Ready              

         Stack Port Status             Neighbors    

Switch#  Port 1     Port 2           Port 1   Port 2

--------------------------------------------------------

  1        Ok         Ok                2        3

  2       Down        Ok              None     None

  3        Ok        Down               1      None

------------------ show process cpu ------------------

CPU utilization for five seconds: 48%/0%; one minute: 8%; five minutes: 6%

------------------ show process memory ------------------

Total: 101589748, Used: 36344516, Free: 65245232

------------------ show logging ------------------

020489: .Jul 23 10:56:55: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN

020490: .Jul 23 10:57:54: %XDR-6-XDRIPCNOTIFY: Fatal IPC error occurred for peer in slot 2. Message not sent due to timeout. Disabling linecard

-Traceback= AFC798 21B434 BB9394 BBD6B0 BBDDDC BD04B8 908064 8FE62C

020491: .Jul 23 11:11:23: %PLATFORM_RPC-3-MSG_THROTTLED: RPC Msg Dropped by throttle mechanism: type 1, class 21, max_msg 8, total throttled 0

-Traceback= AFC798 576DA8 24EA0C 24EB50 24F5C8 24F7C0 908064 8FE62C

020492: .Jul 23 11:14:23: %PLATFORM_RPC-3-MSG_THROTTLED: RPC Msg Dropped by throttle mechanism: type 3, class 21, max_msg 8, total throttled 1

-Traceback= AFC798 576DA8 24EA0C 24EB50 24F5AC 24F7C0 908064 8FE62C

020493: .Jul 23 11:17:23: %PLATFORM_RPC-3-MSG_THROTTLED: RPC Msg Dropped by throttle mechanism: type 3, class 21, max_msg 8, total throttled 3

-Traceback= AFC798 576DA8 24EA0C 24EB50 24F5AC 24F7C0 908064 8FE62C

020494: .Jul 23 11:20:23: %PLATFORM_RPC-3-MSG_THROTTLED: RPC Msg Dropped by throttle mechanism: type 3, class 21, max_msg 8, total throttled 5

-Traceback= AFC798 576DA8 24EA0C 24EB50 24F5AC 24F7C0 908064 8FE62C

020495: .Jul 23 11:23:23: %PLATFORM_RPC-3-MSG_THROTTLED: RPC Msg Dropped by throttle mechanism: type 3, class 21, max_msg 8, total throttled 7

-Traceback= AFC798 576DA8 24EA0C 24EB50 24F5AC 24F7C0 908064 8FE62C

020496: .Jul 23 11:24:13: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP

Jul 23 11:05:23: TODO: Haven't heard from th RP. Disable (Data_Center_1-2)

020497: .Jul 23 11:24:13: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state DOWN

020498: .Jul 23 11:24:13: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state UP

Jul 23 14:19:47: %PLATFORM_RPC-3-MSG_THROTTLED: RPC Msg Dropped by throttle mechanism: type 5, class 20, max_msg 4, total throttled 0 (Data_Center_1-2)

-Traceback= AFC798 576DA8 4F8AA4 4FC004 908064 8FE62C (Data_Center_1-2)

Jul 23 15:00:09: %PLATFORM_RPC-3-MSG_THROTTLED: RPC Msg Dropped by throttle mechanism: type 5, class 20, max_msg 4, total throttled 3 (Data_Center_1-2)

-Traceback= AFC798 576DA8 4F8AA4 4FC004 908064 8FE62C (Data_Center_1-2)

020499: .Jul 23 15:05:11: %CLEAR-5-COUNTERS: Clear counter on interface GigabitEthernet2/0/11 by vty1 (10.52.30.50)

020500: .Jul 23 15:05:14: %CLEAR-5-COUNTERS: Clear counter on interface GigabitEthernet2/0/12 by vty1 (10.52.30.50)

020501: .Jul 23 15:05:19: %CLEAR-5-COUNTERS: Clear counter on interface GigabitEthernet2/0/13 by vty1 (10.52.30.50)

020502: .Jul 23 15:05:25: %CLEAR-5-COUNTERS: Clear counter on interface GigabitEthernet2/0/15 by vty1 (10.52.30.50)

020503: .Jul 23 15:05:28: %CLEAR-5-COUNTERS: Clear counter on interface GigabitEthernet2/0/16 by vty1 (10.52.30.50)

020504: .Jul 23 15:09:56: %CLEAR-5-COUNTERS: Clear counter on interface GigabitEthernet2/0/24 by vty1 (10.52.30.50)

020505: .Jul 24 05:52:08: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN

020506: .Jul 24 05:52:09: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state UP

020507: .Jul 24 05:52:10: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state DOWN

020508: .Jul 24 05:52:10: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state UP

All switches are running 12.2(25)SEE2 version. and switch is live from 1 year, 36 weeks. I cannot able to reboot the switch as production servers are online. Please let suggest if you got any ways to resolve this problem without reboot.

Regards

Chandu

8 REPLIES 8
Contributor

3750 Switch Stacking Problem

Hi Chandra,

try to invert the ends of the cable

Alessio

3750 Switch Stacking Problem

Hi Alessio, Appriciate your response. But we have tried that one and that didn't resolve this issue.

Advocate

3750 Switch Stacking Problem

Chandu,

Can you replace or check the cable between

SWITCH 1 PORT 1 and SWITCH 2 PORT 2

Regards,
Alex.
Please rate useful posts.

Regards, Alex. Please rate useful posts.

3750 Switch Stacking Problem

Alex, thank you for your response:

SWITCH 1 PORT 1 and SWITCH 2 PORT 2 is good.

SWITCH 2 PORT 1 and SWITCH 3 PORT 2 is having poblem. we tried with new cable as well its not comming up.

Contributor

3750 Switch Stacking Problem

it seems to e a bug:

https://supportforums.cisco.com/thread/164633

Can you upgrade the IOS?

Alessio

3750 Switch Stacking Problem

Alessio, Reboot and upgrade is my last option left. that bugs doesnt seems best match to this condition. any other ideas are really appriciated.

Contributor

3750 Switch Stacking Problem

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/troubleshooting/switch_stacks.html

Did you try to better tighten the screws?

In this doc, half way you find some case quite similar to yours

Alessio

Hall of Fame Community Legend

Re: 3750 Switch Stacking Problem

Hmmmm ...

Don't want to be the bearer of bad news here ...

I believe you have TWO (2) issues here.

Firstly, there's a strong possibility that you are running a buggy IOS.  I mean, 12.2(25)SEE???  I wouldn't touch that version with a ten-mile-pole.

Secondly, there's a strong possibility that your switches have a hardware defect that affects the stacking module.  Please see attachment.

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