07-24-2008 06:51 PM - edited 03-06-2019 12:27 AM
Dear All,
We have noticed on 3750 switch that the stacking ports have been unstable,
they are flapping server times a day,i couldnt able to find out any thing exeptthe below explanation
Error Message STACKMGR-4-STACK_LINK_CHANGE: Stack Port [chars] Switch [dec] has
changed to state [chars].
--------------------------------------------------------------------------------
Note This message applies only to the Catalyst 3750-E switches.
--------------------------------------------------------------------------------
Explanation The specified stack port status has changed state to up or down. The first [chars] is the stack port (1 or 2),
[dec] is the switch number, and the second [chars] is the new state (up or down).
Recommended Action No action is required.
Logs of the Switch are below
-------------------------------
ul 24 15:35:02.028 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state DOWN
Jul 24 15:35:02.892 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state UP
Jul 24 15:35:03.035 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state UP
Jul 24 15:37:30.089 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state DOWN
Jul 24 15:37:30.123 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state DOWN
Jul 24 15:37:31.096 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state UP
Jul 24 15:37:31.129 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state UP
Jul 24 15:46:41.542 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state DOWN
Jul 24 15:46:42.549 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state UP
Jul 24 15:50:18.392 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state DOWN
Jul 24 15:50:21.420 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state UP
Jul 24 15:51:23.044 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state DOWN
Jul 24 15:51:24.051 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state UP
Jul 24 15:56:33.144 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state DOWN
Jul 24 15:56:34.151 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state UP
Jul 24 15:59:43.478 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state DOWN
Jul 24 15:59:44.484 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state UP
Jul 24 16:05:06.748 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state DOWN
Jul 24 16:05:07.755 UTC: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state UP
Could some one help out on this
Thanks and regards
Sharan
07-24-2008 07:56 PM
Sharan,
Have you tried different stackwise cables or ports of possible? I have had troubles in the past with the cables not being securely tightened in the back of the switch also.
HTH,
Mark
07-24-2008 10:33 PM
Yes, I would first check the hardware too.
My question, did you stach switch 1 port 1 -> switch 2 port 1, this is maybe why you got problems, beause it is wrong I think.
(Stupid question, but it's possible... ;-) )
PS: you can give us the output from "show switch detail"
maybe we can see a problem.
Sebastian
07-24-2008 11:06 PM
Dear All,
Thanks very much for your valuble inputs
please find the show switch details
XXXX-2100-G-3750-1#sh switch detail
Switch/Stack Mac Address : 0091.aad8.2d00
H/W Current
Switch# Role Mac Address Priority Version State
----------------------------------------------------------
1 Member 002f.c987.7300 1 0 Ready
2 Member 0032.1b8a.2200 1 0 Ready
*3 Master 0091.aad8.2c00 1 0 Ready
Stack Port Status Neighbors
Switch# Port 1 Port 2 Port 1 Port 2
--------------------------------------------------------
1 Ok Ok 3 2
2 Ok Ok 1 3
3 Ok Ok 2 1
XXX-2100-G-3750-1#
XXX-2100-G-3750-1#sh switch neighbors
Switch # Port 1 Port 2
-------- ------ ------
1 3 2
2 1 None
3 2 1
XXXX-2100-G-3750-1#sh switch stack-ports
Switch # Port 1 Port 2
-------- ------ ------
1 Ok Ok
2 Ok Ok
3 Ok Ok
07-24-2008 11:21 PM
Hi Sharan,
thanks for the output.
The "None" in your output you see on the button ist a mistake. It does not really match to your error messages, but can be in relation to that. I have stacks but never this problem bevor. I think the Stack cable or port is damaged.
I can check that in my lab, but only next tuesday. Maybe some others have more ideas and experience. If you dont't get reply until there, I will try check that in lab.
XXX-2100-G-3750-1#
XXX-2100-G-3750-1#sh switch neighbors
Switch # Port 1 Port 2
-------- ------ ------
1 3 2
2 1 None
3 2 1
07-29-2008 10:46 PM
Dear All
Any update in this issue
Thanks & regards
Sharan
07-29-2008 11:10 PM
Sorry, I was on the road yesterday, i try to imitate it today.
Sebastian
07-30-2008 05:50 AM
Hi Sharan,
you are not the only one with this problem :-(
I see the same log entries.
New Stack, IOS 12.2(44)SE2
My Stack has only 2 of once 3 members!
Have there been another member in your stack, which was removed?
Willem
07-30-2008 09:45 PM
HI all
I have 5 stack switches with the same IOS,Version 12.2(44)SE2. but this problem exist only in 2 stack,i am not sure it is related to IOS
thanks
sharan
07-31-2008 12:22 PM
First Sorry for my late replay, lt of work...
I check it today with a Stack and i haven't the problem or can see andy point which could be that.
Second I check some troubleshooting guides, config guides and else. No idea.
Google didn't help too..
I'M really Sorry :(
Maybe this helps, my last Idea
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12235se/scg/swgold.pdf
I will stay on that problem, if i have new, it old you of course
best regards
Sebastian
07-31-2008 10:37 PM
Dear All,
Any sugestions from any one
regards
Sharan
08-01-2008 08:14 AM
Hi,
Thus your stackwise cable in a full ring?
Try configuring the stack-ring speed to full.
Regards,
Dandy
08-04-2008 01:49 AM
Hi,
please find the out put
G-3750-1#sh switch stack-ring speed
Stack Ring Speed : 32G
Stack Ring Configuration: Full
Stack Ring Protocol : StackWise
#
Could you please tell me how to go abt from here
regards
Sharan
08-18-2008 10:13 AM
Im experiencing the exact same problem with the flapping stack-ports - also running the 12.2(44)SE2.
Please reply to the thread if you find any solution.
08-28-2008 09:45 PM
Hi Sharan,
as i wrote before, i have the same problem.
Down/Ups every 30 Sec.
The same as in your case mostly the same link (sw2 Port 1 to SW1 port 2).
So i decided to change this Cable -> YES it changed it got even worse! Now i have Down/ups every 10 Sec.
After "reload slot 2" (I have only 2 switches) it came to Down/Up times from 1-2 Sec.
After a "reload" (i think this will reload the hole stack) the Down/Ups show up every 20-30 sec somtimes even longer. (Same switch is master again)
Sharan (and others) can you do a ping from a windows client, not connected at the switch to a device connected to this 3750?
I notice here a TTL of 63 or even 59 (different clients)!!!
Pinging a device on the same vlan on a other switch (3524) a have a TTL of 254.
a Tracert only shows 2 Hops.
Can sombody explain this last behavior?
What are the TTLs on a "working" stack?
Thanks
Willem
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