From: Artir Geci (artirgeci@gmail.com)
Date: Tue Mar 08 2005 - 11:45:27 GMT-3
You have the routers on different AS. If you leave it without changing the
next-hop (just basic config), at Ra as next-hop for 172.16.0.0 you are going
to have 1.1.1.3, so in this case you need to put "neighbor next-hop-self".
If you have Doyle's volume II check there for the next_hop attribute to
understand why. Or check RFC 1771.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Dillon Yang
Sent: Tuesday, March 08, 2005 12:57 PM
To: Group Study
Subject: Where-next-hop-self
Hi, all:
A case says the next hop to 172.16.0.0 in Ra should be the 1.1.1.2 in the
topology:
Ra(spoke)------FR--------Rb(hub)-------FR-------Rc(spoke)
1.1.1.1-----------------1.1.1.2-----------------1.1.1.3---172.16.0.0
As1----------------------As2--------------------As2
It says the next-hop attribute has been carried by Rb to Ra, to prevent
1.1.1.3(next-hop) being seen, the command "neighbor 1.1.1.1 next-hop-self"
must be under "router bgp 2" on Rb. My thought is the 3 routers are in the
same subnet, so its unnecessary to change the default next-hop. Any advice?
TIA
dillon
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