[nsp] Catalyst errdisable

[Jack.W.Parks at alltel.com]

I have the following configuration:

RouterA <--> Cat3550-1 <-.1q-> Cat3550-2 <--> RouterB

We added Cat3550-2 to provide some resiliency for the market Ethernet
segment, Then we got the dreaded "%ETHCNTR-3-LOOP_BACK_DETECTED:"  which
shutdown the .1q trunk between the switches.  I have experienced this
behavior before, but now we are getting MALLOCFAIL messages in the logs
of both switches (yes, the reported time is off).

After googling and searching CCO, I still don't have a good explanation
of this problem.  The best I found was
https://puck.nether.net/pipermail/cisco-nsp/2003-July/004374.html, but
it still doesn't provide a in depth solution.  At this time, I have
turned off errdisable with "no errdisable detect cause all" pending a
TAC recommendation.

Any thoughts or helpful hints?

3550-1

Mar  5 03:06:18 UTC: %SYS-2-MALLOCFAIL: Memory allocation of 1680 bytes
failed from 0x1473A0, pool I/O, alignment 0
-Process= "Pool Manager", ipl= 6, pid= 5
-Traceback= 184EEC 186394 1473A4 191DEC 1A4B14

---repeated 7 Times----

3550-2

-Process= "Pool Manager", ipl= 0, pid= 5
-Traceback= 197984 198E7C 156554 1A4BE8 1B7D18
*Oct  3 11:08:25 UTC: %SYS-2-MALLOCFAIL: Memory allocation of 1680 bytes
failed from 0x156550, alignment 0 
Pool: I/O  Free: 2308  Cause: Memory fragmentation 
Alternate Pool: None  Free: 0  Cause: No Alternate pool 

---repeated 16 times---

*Oct  3 11:35:10 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface
FastEthernet0/24, changed state to down
*Oct  3 11:36:48 UTC: %ETHCNTR-3-LOOP_BACK_DETECTED: Loop-back detected
on GigabitEthernet0/2. The port is forced to linkdown.



Jack W. Parks IV
Sr. Network Engineer
ALLTEL Communications
jack.w.parks at alltel.com
Work: 501-905-5961
Cell: 501-680-3341
 
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