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RE: Router / Protocol Problem

  • From: Mike Walter
  • Date: Wed Sep 06 10:44:32 2006

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 
using.  You say you have two Cisco 7204s - are these straight '04s, or 
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 
any of them?  Do you have CEF enabled on these routers?  What IOS 
version(s) are running on these routers?  What else are they doing
besides 
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, 
or -400 with 256 MB of RAM and you are running into memory exhaustion 
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 
sum" from each router show you?

Have you seen other performance problems lately, such as things getting 
mysteriously slower, beyond the rachability issues you mentioned above?
If so, check if CEF is still running (if it was configured in the first 
place).  When a 7200 gets dangerously low on free memory and CEF is 
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




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