[c-nsp] BGP next hops in BGP not in IGP

[Jon Simola]

On Jul 31, 2016 17:37, "Kamal Dissanayaka" <kamalasiri at gmail.com> wrote:
>
> HI All,
>
> As my knowledge, BGP next hop needs to be in IGP in order to get BGP
routes
> in routing table.
> It looks like, it may have changed ?  BGP routes populate in routing table
> when the next-hp route is learned through BGP.
>
> I tried some googling but I cannot get definite answer.
>
> here is the scenrio
>
> Router A (18162) 172.18.112.41---- 172.18.112.40 Router B (65001)
> 172.18.112.37 --- 172.18.112.38 Router C (65001)

My understanding is that your transit network between A and B should not
appear in your IGP, and B should be setting next-hop-self when advertising
towards C. Logically, B is the exit point from your AS, so everybody just
needs to know how to get the traffic to it.

Regards,

-- 
Jon