[c-nsp] C65K: Any significant correlation between import filter route-map complexity and BGP Router process utilization?

[Mack McBride]

A side note about the relative complexity of the route map.
Prefix lists are heavily optimized while as-path handling is not, especially if you use regexes.
Standard community lists are easier to process than extended community lists.
There are plenty of other caveats to tuning an route-map.

LR Mack McBride
Network Architect

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Gert Doering
Sent: Friday, September 03, 2010 3:01 AM
To: Jeremy Reid
Cc: cisco-nsp
Subject: Re: [c-nsp] C65K: Any significant correlation between import filter route-map complexity and BGP Router process utilization?

Hi,

On Fri, Sep 03, 2010 at 12:03:55AM -0400, Jeremy Reid wrote:
> I believe that route-maps are (largely?) processed in hardware on the 
> 65K platform (S720-3BXL), but

Not at all.

Packet *forwarding* (and possibly "ACL dropping", but still, "things related to other people's packets") is done by the hardware.  

BGP handling is not packet forwarding - all control plane functions are done by the CPU itself.

gert
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