[c-nsp] Two mpls provider with the same core AS# workaround

[Roger Wiklund]

Hi.

Scenario: Two MPLS providers, one major with bulk of the sites. one
minor with ~10 sites.
Both providers have the same AS# in the core, and I want to exchange
routes between these providers (via our network, not directly betweent
the providers).

to overcome this, I thinking about some different approaches (on the
minor MPLS provider side/in our own network)

BGP aggregate (in our network)
allow-as in (minor MPLS providers network)
local-as + allow-as in (minor mpls providers network)
remove private as function in IOS 15.1(2)T (can remove private AS even
if you have a mix of public and private AS#)

Anyone with some experience on this and how this best can be solved?

Thanks!