سلام
شرح سناریو
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R1 is configured for EBGP and IBGP. The EBGP connection to the remote peer address, 141.199.2.2, is the Internet gateway. Therefore, you must send the
community to the remote peer and apply an outbound route map, so the Internetrouters do not use R1 as a transit path. You have yet to apply the route map named setcommunity (arbitrary name). Apply the well-known community no-export, which informs the neighboring router not to use R1 for any traffic not destined for the network 131.108.0.0/16.
configure the four routers, R1–R4, for IBGP, and set the same policies on all four routers.
ensure that R1 does not receive any default routes from R2, R3, or R4 (sets the next-hop-self attribut. Ensure that R1 sets the community to the value 2000.
R1(config-router)#neighbor 141.199.2.2 route-map setcommunity out