[c-nsp] Can I use BGP instead of any IGP?

[Mark Tinka]

On Tuesday, May 29, 2012 11:53:35 AM vijay gore wrote:

> do you mean that you can not use BGP instead of IGP, even
> static route.

Thoroughly speaking, you can't use BGP as an IGP in the 
context of what IGP's are meant to do.

<adding_complexity>
But in concept, you can use BGP as an IGP, e.g., carrying 
customer and interface prefixes in iBGP instead of in the 
IGP as was normally the case (in order to aid scaling), BGP 
Label Unicast particularly for Seamless MPLS designs (in 
order to aid scaling, as well), e.t.c.
</adding_complexity>

But for an IGP, i.e., link state routing protocols, e.t.c., 
BGP doesn't do that. BGP requires an underlying IGP in order 
for its sessions to form - this underlying capability can be 
provided by static routes, connected routes or dynamic 
IGP's.

Mark.