Hi Expertise Im wondering from strange behavior for two IBGP session included in JNCIP_StudyGuide, I have one router make aggregation for the whole network 10/8(R5 in case study of EBGP) and where the routers inside the other ISIS are level-1 routers (R1 & R6) so they reach the Level1-2 router R5 Lo0 through the default route.
We have two scenarios: 1- when this route inserted in their BGP table the R1 which receive this aggregated subnet (with Protocol NH of the router which created the aggregated route R5) through another Level1-2 router R3 will simply choose this subnet more preferred than the default route and the session of the BGP between R1 & R3 will flap and it is normal behavior . 2- The abnormal behavior appear in the other Level-1 area which has direct physical connection with the aggregated router R5 the route wont be inserted in the BGP active table but it will be inserted as Hidden route which cause the Level-1 router R6 keep the IBGP session up. The two issues solved by use static route for the next hop of this aggregated route toward the neighbor while sent this update to be preferred more than even the aggregated BGP route or the Default ISIS route. But the question is why the remote router choose this route as active one while the direct connected router (Route-reflector client ) flagged this route as hidden route?? _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp