From: Sandro Ciffali (sandyccie@xxxxxxxxx)
Date: Sat Oct 20 2001 - 09:39:25 GMT-3
Ebgp peer carries the next hop ip address for a Ebgp learnt route as it is
and gives it to Ibgp peer, This is a problem if next hop ip address is not
advertised to the ibgp peer. Since the ibgp peer has learn ebgp route from
it's ibgp peer however the next hop for that route is not learnt, This does
not allow the route to go into the routing table. There are two solutions to
this, either use next hop self for the neighbor statement on the router
running ebgp and ibgp both for it's ibgp peer, Second solution if you do not
want to use next hop self advertise the next hop address in some igp for the
ibgp peer. Hope this clarifies your doubt.
sandro
----- Original Message -----
From: "Eddie" <guitardudez@yahoo.com>
To: <ccielab@groupstudy.com>
Sent: Saturday, October 20, 2001 2:32 AM
Subject: When is it appropriate to useBGP neighbor X.X.X.X next-hop-self?
> I am on page 417 of Halabi's BGP book. He wants us to
> configure BGP with route reflectors. Why do I need to
> use next-hop-self statements. I know that the purpose
> is to Disable the next hop calculation for this
> neighbor, but I am confused as to why would we want to
> do this?
> Thanks for any input.
> Eddie
>
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