From: Blaine Williams (williams.blaine@gmail.com)
Date: Mon Jun 04 2007 - 17:39:14 ART
John,
Yes. Theoretically, you can run iBGP instead of running an IGP. Any
one of your suggestions would work. However, you are going to have a
hard time getting truly optimal routing. If you go with one large
iBGP domain using next-hop-self, you will have to solve the iBGP full
mesh situation somehow (Route Reflectors or confederations). Given
that, you will have to manipulate the path attributes to get optimal
routing, which is going to become less than managable very fast.. If
you go with an eBGP (or confederations) scenario, you get a little
better routing without manually setting attributes. However, at best
you are picking routes based on the number of hops (aka RIP). You
can't get any really optimal routing decisions like you can with
EIGRP's weighted metric formula and OSPF's cost metric.
Remember, BGP is attempting to solve a different problem than your
IGPs. BGP is designed to provide routing based on your organization's
policies on a massive scale. IGPs are attempting to provide the
fastest route from A to B.
Blaine W.
On 6/4/07, John Gibson <johngibson1541@yahoo.com> wrote:
> Am looking at univercd's "Technology Handbook", and
> the question is slightly different - asking to use
> iBGP in stead of general BGP. And
> their answer says nexthop is carried from external
> AS, so, unless you use static route, the nexthop
> will most likely unreachable.
>
> My solutions,
>
> 1. We don't need static route if every iBGP router
> does "neighbor ... next-hop-self"
>
> 2. If we don't use "neighbor ... next-hop-self",
> simply run eBGP in every router we have.
> Just let every router in our domain be an AS .
>
> 3. If our share holder is not happy that we spend
> much money for the extra AS registration, just
> use a separate private AS in every router and
> remove private AS's at the real border.
>
> I think there are just many many ways to run BGP
> to replace ALL IGP protocols.
>
> Am I thinking straight ?
>
>
>
>
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