From: Chua, Parry (Parry.Chua@xxxxxxxxxx)
Date: Fri Nov 16 2001 - 04:48:41 GMT-3
Assume that if [r1]-Ebgp-[r2]-ebgp-[r3]-ebgp-[r4] and since each router
at
it own AS and no other routing protocols exchange amount them. r3 can
learn the loopback of r1 but r1 will not know how to reach r3 for
return.
Parry Chua
-----Original Message-----
From: Thekkethala [mailto:thek@mediaone.net]
Sent: Friday, November 16, 2001 2:49 PM
To: ccielab@groupstudy.com
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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