BGP neighbors

[shelley_wang]

Hi,

I was asked this question during interview. I would like to verify whether my answer was correct.

Q: If 2 BGP routers are not directly connected, will they become neighbors?

A: As long as they can reach each other through IGP, they can become neighbors.

    EBGP has default TTL 1, so this command should be configured on both BGP routers to overwrite the default TTL setting:

   
     neighbor X.X.X.X ebgp-multihop num-hops-away

thx,

JIngyi

[Mahesh Gohil]

Hi JIngyi

You are right ...ebgp-multihop is required to have peering between non directly connected neighbors.

In addition to that if you want to peer with loopback you also need update-source command along with e-bgp multihop

regards

mahesh