Task 11.3 BGP Explanation AK

Hey,

I understand the task and the solution given but I don't understand why the answer key states that "if these filters were not implemented R3 would prefer R1 for all BGP prefixes." Is this correct?

I understand the filter on R6 is to exclude networks BGP learned prefixes of AS54 but why is the filter on R1 needed? Other than future possible prefixes that may be added later that you may not want in redistributed into your IGP.

How would R3 choose R1 via OSPF for networks coming from R6?

Can anyone clear this up for me. Thanks!

J
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