[c-nsp] EIGRP as core routing protocol on MPLS network

[Oliver Boehmer (oboehmer)]

Kris Price <> wrote on Friday, August 24, 2007 1:42 PM:

> Hi,
> 
> I've been trying to find out the implications of using EIGRP to
> distribute the loopbacks for a BGP/MPLS network instead of the usual
> OSPF or ISIS. But either it isn't a very well covered topic or my
> Google-foo is seriously bad.
> 
> I've lab'ed it up in a very simple environment and for typical Layer 3
> BGP/MPLS VPN applications everything seems to work fine as expected,
> LDP continues distributing labels, and VPN packets are label switched
> across the network.
> 
> However, I assume the caveats are around using features that use
> OSPF/ISIS for transporting additional information or for signalling,
> e.g. perhaps taffic engineering info.
> 
> Given there is no information on this on Google I guess it isn't
> supported and the recommendation is simply "don't do it".
> 
> But I'm curious, so has anyone done this in a production environment
> for any reason, or has anything enlightening to say on the matter?

you can run EIGRP as IGP within an MPLS core for L2VPN and L3VPN just
fine. It is rarely used, but it is, to my knowledge, a supported
configuration. As you've mentioned, the only thing which won't work is
TE, but LDP will advertise the labels for EIGRP prefixes just fine.

	oli