iBGP vs. eBGP RE: CPU Utilization

Unanswered Question
Apr 20th, 2010

I'm curious to know if internal BGP is inherently less CPU intensive than external BGP.  That appears to be the case on our network, but I can't think of a solid reason why that would be true.  If anyone has facts/thoughts on the subject, I'd love to see them.

Thanks in Advance!

I have this problem too.
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Giuseppe Larosa Wed, 04/21/2010 - 00:14

Hello Warren,

in iBGP you can take advantage of BGP route reflectors and/or confederations to reduce the number of iBGP sessions.

Also, what counts is the number of update-groups = number of different outbound policies.

Other possible differences may be in the BGP scanner related timers and on the possible use of BGP next-hop tracking to reduce CPU usage.

The first ones can have different values (but it should per address-family and not per BGP session type iBGP vs. eBGP) and BGP next-hop tracking may fit with iBGP scenarios

Apart from this, generally speaking I have no evidence of less use of CPU in iBGP in comparison to eBGP

Hope to help

Giuseppe

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