[c-nsp] eBGP Peer with non-bgp transit router in the middle

[William Jackson]

Hi all

 

A recommendation on preferred method of achieving the following
scenario:

 

[AS Y BGP Router]-----------[AS Z transit router]------------[AS Z BGP
router]

 

 

AS Y router config

 

Neighbor BGP-Z-loopback as Z

Neighbor BGP-Z-loopback ebgp-multihop 10

 

Ip route x.x.x.x. 255.255.255.255 y.y.y.y

 

AS Z BGP Router

 

Neighbor BGP-Y-Interface update-source loopback0

Neighbor BGP-Y-Interface ebgp-multihop 10

 

 

The BGP neighbors are coming up and advertising routes.

 

The problem is that the transit router is only running IGP and has a
default route passed to it from AS Z BGP router.

So when its queried about the routes advertised by AS Y it doesn't know
and simply uses the default thus forming a loop.

 

I read that it is recommended to advertise the BGP routes into the IGP
for this?

I was planning only using a route-map or some other device to only
inject into the IGP the routes advertised from AS Y?

 

Y is a small AS with three or four routes.

 

Any comments?

 

thanks