Re: Is it possible to share a physical interface and a routing

I did something similar in my lab when trying to learn VRF Lite. I do not
have the set up running anymore ... ;-(

Basically you have VRFs off of a global router and you need to share some
access to and from the VRF / global tables. This can be done via a manual
process.

In my lab, I used global static routes to advertise these VRF resources into
the global table. I simply redistributed these static routes into my global
OSPF and now every other global router knew of these destinations.

I then used static routes within the VRF's routing table to advertise
reachability to global resources. Again, I redistributed the static routes
into my VRF routing process.

Lastly when return traffic would come from global locations and hit my
global router, I used static routes to the inside VRF interface. Sounded
weird to me too! But it works fine on the router and return traffic was
routed just fine.

Everything worked and it was a bugger to get working ... mostly because I
had to think through everything and I was learning the entire time.

(watch the ugly word wrap):
http://www.cisco.com/en/US/tech/tk436/tk832/technologies_configuration_example09186a0080231a3e.shtml

Good luck and hit us back with any questions and or comments,

Andrew Lissitz

.
2010/2/1 <a-naka_at_mtf.biglobe.ne.jp>

> Hi guys,
>
> Is it possible to share a physical interface and a routing by some VRFs?
>
> I need to connect one local hub CE router R1 and some remote spoke CE
> routers R2, R3, ..., Rx via GRE tunnel.
> I also need to isolate them by using VRF on R1, because remote sites
> address space can be overlapped.
>
> R1 fa0/0 -------+------- R2
> +------- R3
> +------- .
> +------- .
> +------- .
> +------- Rx
>
> To establish GRE tunnel for each remote spoke CE router, I want to share
> the physical interface fa0/0 and default route via the interface by those
> VRFs.
> I don't want to configure several loopback interfaces for every each site,
> because I have only 1 global ip address which is reachable from each remote
> site.
>
> I would appreciate it if anybody gave me an idea.
>
> Achi :)
>
>
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-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net