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External route with Down Bit set by CE router

walter1972
Level 1
Level 1

I have a question regarding the Down Bit. All the documentation I see concentrates on the redistribution of the MP-BGP into OSPF but I want to know more about the OSPF redistribution into MP-BGP. I think the rule is different for Type3 and Type5 LSAs.

Lets say the CE redistributes a RIP route into OSPF, creating an LSA Type 5 route sent to the PE router - with the Down Bit set.

Will this PE router redistribute this route into MP-BGP?

I know that LSA Type 3 summary routes will not be redistributed into MP-BGP if the Down Bit is set but I am wondering about external OSPF routes with the Down Bit set????

I am assuming that redistribution of RIP into OSPF at the CE does infact set this Down Bit before passing on to the PE router?

13 Replies 13

shivlu jain
Level 5
Level 5