RE: ospf with vrf

Here's something similar to what I was labbing.

Pe----mpls-----pe

| |

A1 A2

| |
ce----A0--c-----ce

Pe to ce is in area 1 and another pe to ce is in area 2...then the legacy
customer network is area 0 between the ce's and c.

From: Yuri Bank [mailto:yuribank_at_gmail.com]
Sent: Sunday, June 17, 2012 2:04 AM
To: Aaron
Cc: Ccielab_at_groupstudy.com
Subject: RE: ospf with vrf

It depends, what area is your CE-to-PE adjacency in?

Remember a router will not use IA routes learned from a none backbone area
IF it's an ABR. When you create a VRF-OSPF instance, it automatically
becomes part of the MPLS Super backbone, essentially part of Area 0. This is
why the 'capability vrf-lite' feature is needed. It removes the router from
the Super backbone, meaning you can now install Type 3 LSA information into
the RIB, learned from none backbone areas. It also disables the Down-bit
check.

-Yuri

On Jun 16, 2012 9:09 PM, "Aaron" <aaron1_at_gvtc.com> wrote:

I think I found the answer, although I don't fully understand it all yet. I
have heard about this before and recall some of it.

This seemed to do the trick...under, router ospf vrf testvrf "capability
vrf-lite"

I read this. https://supportforums.cisco.com/thread/202402

 Apparently it has something to do with loop prevention and "pe checks" of
domain id and down bit or something like that to keep pe from adding
anything other than type 1 and 2's to rib.

Aaron

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
Aaron
Sent: Saturday, June 16, 2012 10:15 PM
To: 'Ccielab_at_groupstudy.com'
Subject: ospf with vrf

why does my pe lose the ability to add type 3 (summary) routes to its rib
AFTER I convert its ospf process to vrf ?

in other words, when my pe's ospf process does not have vrf config I see the
IA routes to other areas, but as soon as I change my ospf process to vrf I
lose my IA routes. They are still in the ospf db though, but just not being
added to the RIB.

Aaron

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Received on Sun Jun 17 2012 - 21:56:15 ART