From: James (james@towardex.com)
Date: Mon Jul 05 2004 - 16:33:54 GMT-3
Hi,
> next-hops are what the IGP is all about in bgp networks as I'm sure you
> know. They'll always be there. However, your IGP next hop is a derivative
> of your BGP next-hop, which in this case is controlled by lpref. If you
> have an IGP path to a local destination that transits an external network,
> your network is broken ;-)
I agree with you completely. Unfortunately, CCIE labs often require
non-realistic, soo wrong and broken setup of BGP / transit configurations that
it rather scares me. But I believe they are doing this for a reason -- make it
as complicated as possible to ensure that the student understands the protocols,
which is good challenge.
Lets just hope a candidate doesn't use IGP-spanning-over-multiple-AS topologies
in real life after he gets his CCIE :-D
-J
>
>
>
> >--Richard
> >
> >-----Original Message-----
> >From: Peter van Oene [mailto:pvo@usermail.com]
> >Sent: lunes, 05 de julio de 2004 15:45
> >To: ccielab@groupstudy.com
> >Subject: Re: BGP indecision !?!?
> >
> >
> >At 05:32 PM 7/4/2004, Richard Dumoulin wrote:
> >>Hi group,
> >>
> >>Suppose the following scenario: Ra and Rb are in the same BGP AS 1.
> >>Both are connected to another AS 2. AS 2 sends routes to AS1. And we
> >>are asked to configure in such a way that Ra will prefer to exit to AS2
> >>via Rb instead of directly. One way is to increase the local preference
> >>on Rb. But what happens if the next hop of those routes has a lower igp
> >>metric through AS 2 ? Should the metrics be manipulated so that Ra
> >>traffic is actually sent through Rb ?
> >
> >Pref is your tool here. Why would AS1 and AS2 be in the same IGP
> >domain? Also, why would BGP routes be in the IGP?
> >
> >
> >
> >
> >>Thank you
> >>
> >>--Richard
> >>
> >>
> >>
> >>
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-- James Jun TowardEX Technologies, Inc. Technical Lead Network Design, Consulting, IT Outsourcing james@towardex.com Boston-based Colocation & Bandwidth Services cell: 1(978)-394-2867 web: http://www.towardex.com , noc: www.twdx.net
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