[c-nsp] How to connect two VRFs on the same router? (without a loop-cable)

[Christian MacNevin]

All of these suggestions will, I'm sure, work (there are chops here I
can't begin to match). My preference is usually to stick with only one
protocol or IOS construct, however. Less tracing of weird config.

So here's how it goes. Apologies if there's typos, it's been a while
and I'm at home without a router to talk to:

!set all your routes in A that you want to be reachable in B here
ip prefix-list prefixes_A2B a.b.c.d/24
!
route-map A2B permit 10
match ip address prefix-list prefixes_A2B
set extcommunity rt 123:456
!
ip vrf A
export map A2B
import 123:457
!

matched by....

ip prefix-list prefixes_B2A w.x.y.z/24
!
route-map A2B permit 10
match ip address prefix-list prefixes_B2A
set extcommunity rt 123:457
!
ip vrf B
export map B2A
import 123:456
!




On 7/22/07, Gunther Stammwitz <gstammw at gmx.net> wrote:
> > -----Ursprüngliche Nachricht-----
> > Von: Christian MacNevin [mailto:macnevin at google.com]
> > Gesendet: Sonntag, 22. Juli 2007 05:48
> > An: Gunther Stammwitz
> > Cc: cisco-nsp at puck.nether.net
> > Betreff: Re: [c-nsp] How to connect two VRFs on the same
> > router? (without a loop-cable)
> >
>
> Hello Christian!
>
> Thanks for your reply. Please see below:
>
> > Just leake route targets between them. If you want to do it
> > only on the local router, then export all the routes you want
> > into a new route target by adding the extended community
> > through a route map, then import that same route target on
> > the other side.
> Okay - that's what the other people told too and seems to be the right way.
>
> >
> > There's also some horrible vrf jumping into default routing
> > table stuff people have been doing which frankly doesn't bear
> > thinking about.
> >
> ... But is is getting more complicated. In fact I'm only using one vrf and
> the default instance and want to export routes from the default instance
> into the vrf.
>
> Would you have an example how to accomplish an export from the default
> instance into a vrf for me, please?
>
> Thanks,
> Gunther
>
>