[92086] in North American Network Operators' Group
RE: Router / Protocol Problem
daemon@ATHENA.MIT.EDU (Mike Walter)
Wed Sep 6 10:43:28 2006
Date: Wed, 6 Sep 2006 10:42:35 -0400
From: "Mike Walter" <mwalter@3z.net>
To: "Justin M. Streiner" <streiner@cluebyfour.org>, <nanog@merit.edu>
Errors-To: owner-nanog@merit.edu
Thanks for everyone's great input. Here are answers to Justin's
questions.
#1 - 12.3.6a - 7204VXR (NPE400) 512MB - 200+ MB free
#2 - 12.2.15T5 - cisco 7204VXR (NPE225) - 256MB (I have a NPE400 - 512MB
I want to swap in) - 23MB Free (Issue?)
Full Routes from all peers. No internal routing protocol as of yet, all
static routes. Getting ready to implement OSPF. I have not rebooted
the routers as a test. I have CEF on both routers. I have had some
customers complaining about slowness.
Mike Walter, MCP
Systems Administrator
3z.net a PCD Company
http://www.3z.net
"When Success is the Only Solution think 3z.net"
Voice (859) 331-9004
Fax (859) 578-3522
-----Original Message-----
From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of
Justin M. Streiner
Sent: Wednesday, September 06, 2006 9:42 AM
To: nanog@merit.edu
Subject: Re: Router / Protocol Problem
On Wed, 6 Sep 2006, Mike Walter wrote:
> I normally would not post to the group, but I am 100% stumped and have
> talked with peers with no luck.
>
> I have (2) Cisco 7204 Routers running BGP with 3 peers and HSRP. I am
> not doing anything special with BGP, pretty much a default config that
> has not changed in years.
Please provide details on both your default config and the hardware
you're=20
using. You say you have two Cisco 7204s - are these straight '04s, or=20
7204VXRs? What NPE(s) are you using, and how much memory is on them?
The BGP you're getting from your peers - are you getting full routes
from=20
any of them? Do you have CEF enabled on these routers? What IOS=20
version(s) are running on these routers? What else are they doing
besides=20
slinging BGP routes? Does the problem go away for a while if you reboot
one router or the other?
Without knowing any of this, it sounds like you might have NPE-225,
-300,=20
or -400 with 256 MB of RAM and you are running into memory exhaustion=20
issues from carrying full routes. That's been a pretty popular topic on
this list and others like cisco-nsp in the last 12 months :)
At a minimum, what do the output of "show mem summary" and "show ip bgp=20
sum" from each router show you?
Have you seen other performance problems lately, such as things getting=20
mysteriously slower, beyond the rachability issues you mentioned above?
If so, check if CEF is still running (if it was configured in the first=20
place). When a 7200 gets dangerously low on free memory and CEF is=20
running, it may cannibalize the IP CEF process to try to conserve
memory.
Earlier 12.0 releases did this - I don't know if newer ones still do it.
jms
