From: info@mpauli.de
Date: Thu Oct 02 2003 - 13:27:08 GMT-3
Hello guys,
I've spend the whole day to troubleshoot my OSPF-lab and I would like to share my gathered knowledge with you.
Imagen the following situation:
R4-----------------------R3----------------R5--------------R2
OSPF-Demand, Area 3 Area 3/1 Area 1/0 Area 0
My OSPF-Database was not euqal on all routers, because:
Each ABR (R3 in my case) needs to be attached to area0 !!! (Now that I know that, I read it everywhere....) :-)
Thus I installed a virtual link to R5 and everything was fine.
By the way, if the transit area is authenticated, the virt. link must be authenticated as well.
Cheers
Marcus
-------- Original Message --------
Subject: RE: Cisco memory allocation problem--need advice (02-Okt-2003 18:12)
From: eteisbe@qwest.com
To: alee@cccis.com
> Arthur,
>
> Here's a quick way to check to see if the issue is virus ICMP traffic
> (likely).
>
> Create a two line access-list:
>
> access-list 101 deny icmp any any
> access-list 101 permit ip any any
>
> Apply the list in-bound on the LAN interface:
>
> ip access-group 101 in
>
> You will likely see thousands of hits on the "deny icmp any any" line of
> the access-list in a short period of time when you do a "show
> access-list".
>
> I have seen the exact same thing happen on several routers. It can take
> down a router with or without NAT running. It is likely a couple of
> machines (or more) infected with Welshe or Nachi virus. It's amazing how
> much traffic one or two machines can generate when infected with these
> viruses.
>
> HTH
> -Evan.
>
>
> -----Original Message-----
> From: alee@cccis.com [mailto:alee@cccis.com]
> Sent: Thursday, October 02, 2003 10:40 AM
> To: ccielab@groupstudy.com
> Subject: Cisco memory allocation problem--need advice
>
>
> Has anyone seen the following message in your router log? On Sep. 29, a
> couple of our remote routers, plus ISP router had the memory problem
> suddenly. I saw someone posted router rebooted due to virus. Not sure
> if
> it's related. I think it's very likely since we never have the problem
> before. Any advice? BTW, here the IOS we are running. IOS (tm)
> C2600
> Software (C2600-JS-M), Version 12.1(20). Thanks.
>
>
> Sep 29 08:40:42 EST: %SYS-2-MALLOCFAIL: Memory allocation of 20000 bytes
> failed
> from 0x802AFFE0, alignment 0
> Pool: Processor Free: 8471376 Cause: Memory fragmentation
> Alternate Pool: None Free: 0 Cause: No Alternate pool
>
>
>
> Arthur Lee
> Senior Network Engineer
>
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