Say you have router A having routes with localpref 50, and router B with localpref 100. When A receives a prefix from B, it will be the best in A's table. Router A will not try to propagate routes with localpref 50, because only the best route are propagated (usually). And as the best route is that was received from B, then B will get nothing back.
On Fri, May 17, 2024, 19:16 Nico Schottelius <nico.schottel...@ungleich.ch> wrote: > > I've a question to the list in regards to iBGP behaviour: > > - the router in question imports all routes with a bgp_local_pref of 50 [A] > - the other routers import eBGP routes with a bgp_local_pref of 100 [B] > - my assumption would be that the lower preference route would > propagated via iBGP, however that is not the case > - the above router also receive the higher preference routes via iBGP > > Is the default iBGP behaviour to *not* export routes with lower > preference to other routers? That would explain the behaviour I see. > > Best regards, > > Nico > > -- > Sustainable and modern Infrastructures by ungleich.ch >
