From: Scott Morris (smorris@internetworkexpert.com)
Date: Sun Jul 27 2008 - 13:19:25 ART
The vrf-lite is used if you want to run vrf's for partitioning tables, but
you do not have MBGP (OSPF's SuperArea) on the back side.
Confgure it on your PE side. An easy example is if you own a large office
building and want to provide Internet to your tenants, but don't want to
care what their Ips or routing is! YOU just have a switch with some VRFs,
not some robust mpls network!
HTH,
Scott Morris, CCIE4 #4713, JNCIE-M #153, JNCIS-ER, CISSP, et al.
CCSI/JNCI-M/JNCI-ER
Senior CCIE Instructor
smorris@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Victor Cappuccio
Sent: Sunday, July 27, 2008 9:19 AM
To: Cisco certification; Cisco certification
Subject: no capability vrf-lite
Hi People.
I am trying to understand vrf capabilities under ospf, please use the
following link as the example for my question http://tinyurl.com/create.php
I understand the creation of the tunnels towards each PE using the ssm
address as the destination address in the MDT Tunnel, and that the source
would be the configuration that we do under the VPNv4 BGP Address family for
this auto magical multcast tunnel
My question is more related to the Routing Context, not to Multicast (for
now :)) what would happen if I configure no capabilities vrf-lite under each
CE? assuming that the routers are configured with ospf instead of RIP as the
routing context
is this no capability vrf-lite configuration necessary if ospf was used as
the routing context between the CE/PEs in the CE Router for that figure?
I understand that the PE would would ignore the routes that have the Down
Bit set, and this would originate that the route is not redistributed into
MPBGP,, and that this OSPF DB gets marked when they cross from their area,
converting them as Lsa type 3 in other PE, and with that mark other PE
connected to the same site would ignore the route an solve the possible
loops that can be created.. (so this is the basics)
but I am stuck with that capability vr-lite under the ospf that runs between
the PE and the CEs, when do we need to configure this?
Can someone please elaborate more about this?
Thanks for any comments
-- Victor Cappuccio CCIE R/S# 20657 CCSI# 30452 www.anetworkerblog.com
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