From: wwwjjang@chol.com
Date: Mon Jul 28 2003 - 12:23:02 GMT-3
This is a diagram
L0(2.2.2.2/24)-R2-(e0 1.1.1.1/24)--(e0 1.1.1.2)-R1
Assumtion>
-R1 is in AS 1 and R2 is in AS2
-There is no routing protocol in R1 & R2
-There is no static routing in R1 such as "ip route 2.2.2.2/24 1.1.1.1"
Question>
-When you config a EBGP-peers between R1 & R2,
You have to do configure R2 to use L0-int as the update-source for BGP
against R1 !!
---------------
My answer
----------------
R1>
router bgp 1
bgp log-neighbor-changes
neighbor 2.2.2.2 remote-as 2
neighbor 2.2.2.2 ebgp-multihop 255
R2>
router bgp 2
bgp log-neighbor-changes
neighbor 1.1.1.1 remote-as 1
neighbor 1.1.1.1 update-source Loopback0 **
--> the interface for EBGP-Peering with R1 is L0. is right???
==> R1 has no route to the 2.2.2.2/24, The EBGP-Peers Can't established!!
How can i make a EBGP-peer between R1 & R2 ???
R1#sh ip bgp summ
BGP router identifier 172.168.70.1, local AS number 1
BGP table version is 1, main routing table version 1
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
2.2.2.2 4 2 0 0 0 0 0 never Active
R2#sh ip bgp summ
BGP router identifier 2.2.2.2 local AS number 2
BGP table version is 1, main routing table version 1
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
1.1.1.1 4 1 38 38 0 0 0 00:29:47 Active
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