Re: what are the pros and cons using ospf as the PE/CE protocol
With regard to down bit, it is automatically set by the PE when redistributing BGP routes into ospf as type 1/2/3. The tag field is copied from the bgp as number, into the tag field for type 5/7 (external) routes.
These are both to ensure that a route redistributed into ospf from bgp, cannot go back into bgp on another pe at same site.
This is all done automatically, so you dont need to worry about them.
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