[c-nsp] VRF->Global route leaking in multi-VRF CE installation

[Kenny Sallee]

On Wed, Jan 6, 2010 at 9:05 AM, Ross Vandegrift <ross at kallisti.us> wrote:

> On Wed, Jan 06, 2010 at 10:57:39AM -0600, Cory Ayers wrote:
> > Have you looked at using two interfaces to loop traffic with one
> > interface in the global table and one in the VRF?  You could run two
> > different OSPF processes to transport routes between assuming you
> > only need a default inside the VRF.
>
> Yep that's the key - it just hit me that if I run two OSPF processes
> in the global table.  Use one just for redistribution of routes into
> iBGP and use the other for my actual IGP.
>
> Thanks,
> Ross
>
>

My .02 is that you should put everything in VRF's (even the global table)
and use route-target import/export and import maps (if required) to control
routing domains.

Question - can you use 'neighbor allowas-in' instead of as-override?  I'm
not sure why your BGP AS-PATH was wrong in scenario #3 above - but I'm using
that in a very similar scenario in my lab to solve the problem of having the
same eBGP AS used at 2 different sites connected to 2 different PE routers.
 BGP won't advertise a path it receives w/ it's own ASN in the path

http://www.cisco.com/en/US/docs/ios/12_3t/mpls/command/reference/mp_n5gt.html#wp1007547



Kenny