Re: OSPF support for Multi-VRF on CE routers

From: ron.wilkerson@gmail.com
Date: Sat Mar 21 2009 - 22:20:24 ART


Suppressing pe checks means that the router isn't looking for the dn bit set in the lsa's. When you enable vrf in a router, it automatically tries to be a pe router. A pe router will try to avoid ospf routing loops by checking the dn bit.

Since your router shouldn't behave like a pe router, the capability vrf lite command tells the router not to behave like one. And disables the routing loop prevention mechanism.

The doc on this is very scarce.

Ron
-----Original Message-----
From: "Gavin Schokman" <g_schokman@yahoo.com.au>

Date: Sun, 22 Mar 2009 00:26:18
To: <ccielab@groupstudy.com>
Subject: OSPF support for Multi-VRF on CE routers

Hi all,
 
I've been playing with all things OSPF this weekend and I've hit a bit of a
wall with one feature.
The feature is "OSPF support for Multi-VR on CE Routers". Specifcally, I
don't understand exactly what the "capability vrf-lite" command does.
 
When using it in my environment, I don't see a difference between when I
have the command in my configs and when it's not.
Doing some digging on the net hasn't proven particularly helpful. Many
references say it has something to do with suppressing PE checks without
saying what those checks are.
It may be that the scenarios I'm working on aren't making the effect of the
"capability vrf-lite" command visible.
 
Can someone please let me know what the command does and also what the
"suppressed PE checks" are?
 
Many thanks.
 
Kind regards,
Gavin

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