[c-nsp] C2691-BGP Scanning process.

[dje]

BGP scanner causing high CPU burstsis quite normal. We have 7200's
running a full feed that experienced the same spikes. 
 
The only way to reduce the CPU load is to
reduce the number of BGP routes that the router has to process. Here's a
link to Cisco's documentation explaining why this happens:
 
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00801c4f48.shtml
 
Daniel Evans
Sr. Network Engineer
ALLTEL Communications
 
 
On Wed, 24 Nov 2004 06:30:38 -0800
"Montes, Carlos M" <carlos.m.montes at boeing.com> wrote:
> I have three Cisco 2691 routers, each with a single T-1 circuit connected to and ISP.  I see that the BGP Scanning process causes the CPU to spike up 100% every 15 seconds or so.  When this happens and I PING through the T-1's out to the directly attached router at the ISP, the ping round trip increases from about 4 ms to 400 ms. 
> We are accepting the full routing table and no default routes or networks.  Shouldn't these routers be able to handle BGP without affecting their performance?  They all have 256MB of RAM.
> Any suggestions on what to do different here?  I considered asking the ISP's for default routes and filter everything else, or simply just ask them for a default route, but it seems a shame not to be able to choose the shortest BGP path instead of just following a default.  I kind of like the full routing table.
> 
> Carlos
> 
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