Redistribution of IGP into BGP

stevehollowaysteveholloway Member Posts: 3 ■□□□□□□□□□
in CCIE
I've have been doing some reading and was wondering why you would redistribute say OSFP into BGP. Seems to be fairly common but why do it when BGP has the capability of learning routes via null and local RIB.
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Answers

  • albersjalbersj Registered Users Posts: 3 ■■■□□□□□□□
    edited July 2020
    You have to get the routes from OSPF to BGP some way.  BGP won't automatically start advertising them just because they are in the RIB as OSPF routes. 

    If you wanted another BGP AS to know your 1000 OSPF routes, there are two options..
    1. type 1000 BGP network statements (one exact match for each OSPF route).
    2. redistribute all 1000 OSPF routes at once with one command


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