From: Mohamed, Liban [NTK] (Liban.Mohamed@sprint.com)
Date: Wed Jul 18 2007 - 10:50:31 ART
Ian,
Please make sure the SP is redistributing your OSPF correctly, so they need to match your internal routes.
Test-router(config-router-af)#redistribute ospf xxx match ?
external Redistribute OSPF external routes
internal Redistribute OSPF internal routes
nssa-external Redistribute OSPF NSSA external routes
Liban Mohamed
NTAC-IP
Sprint/Nextel
www.sprint.net
liban.mohamed@sprint.com
(W) 678-291-3438
(PCS) 404-441-9701
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Ian Blaney
Sent: Wednesday, July 18, 2007 8:40 AM
To: Cisco certification
Subject: MPLS VPN - OSPF PE-CE
Hello All
I have a SP related question which hopefully someone can help me with.
In a Layer 3 MPLS VPN where OSPF is used as the PE-CE routing protocol why
are all internal routes from one site sent as inter-area routes to another
site? I understand the concept that the SP core acts as the super backbone
and the PEs are ABRs instead of ASBRs which would normally be the case when
redistributing from one protocol to the other ie OSPF <-> MP-BGP.
Surely the SP core should be as transparent as possible. The OSPF network
type is sent in the extended communities attribute so it wouldn't be
difficult for the egress PE to reconstruct the original OSPF internal route.
Am I misunderstanding something here?
Regards
Ian Blaney
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