From: Anthony Bonilla (anthonybonilla.ccie@gmail.com)
Date: Mon Jun 04 2007 - 14:42:01 ART
John,
First of all, let me admit that I have not seen the doc you just mentioned
but I wanted to add couple of my comments before folks had a chance to read
thru the doc and/or your email and reply back.
next-hop-self is used for iBGP peer so that next-hop from eBGP neighbor is
changed so you don't need to ensure that eBGP peer's IP address is reachable
within your domain.
for second one, if you would be configuring all your routers in seperate AS
(finite private ASNs, remember) you would eventually run out of the private
ASNs
third thing that I have found out is that Cisco IOS does not remove a
private AS from the AS PATH of a prefix if there is a public ASN in the path
so that means that if you connect to a public AS, y ou would not be able to
remove any of the private ASNs (Cisco considers this as illegal but Juniper
would remove private AS even if you had public AS in the path).
HTH
Tony
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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