From: Thekkethala (thek@xxxxxxxxxxxx)
Date: Fri Nov 16 2001 - 04:39:17 GMT-3
apologise for not being clear ....
The query really is : Do I need to redistribute by directly connected (Ebgp)
links that are setup between AS's,into bgp at each of the routers in the
example ?
I just found out that when i did a redistribute connected (under bgp) on all
of the routers - the ping goes through from AS4 to the loopback address on
AS1 ?? My BGP table grew too as a result of all the entries ...
Therefore : sounds like EBGP links need to be explicitly brought into the
"bgp table" across all routers for an end to end IP connectivity to happen
(network/redistribute connected...)
sounds a bit off .... or i am missing something elementary !!!
----- Original Message -----
From: "EA Louie" <elouie@yahoo.com>
To: "Thekkethala" <thek@mediaone.net>; <ccielab@groupstudy.com>
Sent: Friday, November 16, 2001 2:18 AM
Subject: Re: A very basic question : BGP
> Try doing a traceroute to see where your ping is failing. Post those
> results. Also, try your ping/traceroute from AS1 to AS4 and post those
> results.
>
> -e-
>
> ----- Original Message -----
> From: "Thekkethala" <thek@mediaone.net>
> To: <ccielab@groupstudy.com>
> Sent: Thursday, November 15, 2001 10:49 PM
> Subject: A very basic question : BGP
>
>
> > Just a sudden 'shake-up' in my fundamentals all of a sudden
> >
> > Here is the clarification. (EBGP links - do they need to be leaked ???)
> >
> > 1. You have multiple AS's and have EBGP running between them all.
> >
> > as1 ------->as2----->as3------->as4 (a single router in each AS for
> example)
> >
> > lets say yu configure a loopback address in as1 and leak it into bgp
via
> a
> > network statement in as1.
> >
> > Now, keeping the config (basic) as is, yu sit on the router on as4 and
try
> a
> > ping back to as1 to this interface. It does no go thru. However all the
> BGP
> > tables enroute indicate this entry and since they are directly
connected
> ebgp
> > setups, the next hop are there in the ip routing table as well (directly
> > connected).I then did a redistribute-connected under the bgp process on
> ALL
> > the routers and tried again - no luck in reaching the loopback address
in
> as1
> > FROM as4 - however from as2 no problems / as3 and as4 no go at all !!
> >
> > My Question>
> > 1. The eBGP links between routers :
> >
> > Do we ALWAYS need to consciously redistribute them in BGP setup
> > (using either the redistribute-connected or network statement along with
a
> no
> > auto-summary) to enable a ping / traceroute etc .. for ip basically
> > ...........
> >
> > I am sorry if this sounds really elementary ... but am quite puzzled -
> what if
> > I have a setup involving 50/60 ebgp session (in theory I mean) ....!!!!!
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