Re: eBGP Multihop

[Truman Boyes <truman () suspicious org>]

On 2 Sep 2010, at 5:30 PM, Graham Beneke wrote:

> I have been asked to investigate moving an entire network to multi-hop on all the eBGP sessions. Basically all 
> upstreams, downstreams and peers will eBGP with a route reflector located in the core. This RR will be some kind of 
> quagga or similar box. The dev guys want to be able to poke at the BGP feeds directly and do *magic* that standard 
> router aren't capable of.
>
> My gut feel is that this is a bad idea. Besides anything else it makes sane link state detection very challenging - 
> especially where we have multiple sessions with a peer.
>
> Is their any BCP or operational experience that agrees or disagrees with my gut. ;-)
>
> -- 
> Graham Beneke

Even in lab environments I would say that eBGP multihop is a bad idea. Production networks that try to make money 
should not embark on such a mission. Trust your gut :)

If some box wants to take a feed of routes, it should just iBGP peer with your RRs. 

Truman