OSPF Down bit

Hello Everyone,

Can anyone kind enough to clarify my theoretical doubts about OSPF Down bit.
This is what I believe; please correct me if I am wrong
CE1 advertise OSPF routes to PE1

PE1 redistributes OSPF routes into MBGP

PE2 redistributes MBPG routes into OSPF and set Down bit and advertises to
CE2

CE2 advertises back same route to PE1 via additional connection and it is
discarded as Down bit is set to prevent loop.

 The Down bit can only be set for LSA 2,3,7. LSA 5 doesnt support Down bit,
so we use route tag to perform the same operation.

Thanks,

Bilal

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Received on Wed May 04 2011 - 11:12:22 ART