Re: Capability vrf-lite

Hi Malick,

Summary LSAs generated from the routes redistributed from BGP have special
down-bit set in LSA headers. This is used to prevent routing loops. If the
other PE receive a route with the down-bit set on an interface that belong
to a vrf it drops this LSA.
If your CE is configured with multiple vrf in this situation you need to
disable the loop prevention capability using "capability vrf-lite" under
ospf process.

HTH,

Aliou

On 7 March 2011 23:49, Malik Nouman Ahmad <djmalik_at_gmail.com> wrote:

> Hi,
>
> I am trying to understand the concept of "capability vrf-lite" but couldn't
> simply get it. I was reading on the internet and everywhere they are
> talking
> about DOWN bit and stuff
>
> Can anybody explain why is it needed? Suppose we have CE1-PE1-PE2-CE2
> connectivity with PE-CE protocol as OSPF with same process-ID and MP-iBGP
> in
> the core. Technically speaking if process-IDs are same then domain-IDs are
> equal, therefore intra-area and inter-area routes should appear as
> inter-area routes on the remote CE, while external routes will show up as
> external on the other side.
>
> So again, where and why this feature is required?
>
> Thanks,
> Malik
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Tue Mar 08 2011 - 09:27:29 ART