[c-nsp] C2691-BGP Scanning process.

Brian Turnbow b.turnbow at twt.it
Wed Nov 24 10:04:21 EST 2004

Depending on the provider you may be able to ask them to send you a
smaller table, for example own AS ,directly connected and customer As
ect. Plus a default. That way you can still use BGP best path for some
routes and default the rest. 

> -----Original Message-----
> From: Montes, Carlos M [mailto:carlos.m.montes at boeing.com]
> Sent: 24 November 2004 14:31
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] C2691-BGP Scanning process.
> 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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