Therefore, the only reliable way of applying an updated inbound policy in BGP is to have the neighbor send all its routes again, and subject those routes to the updated policy. It would not be sufficient to subject the existing routes in your BGP RIB to the updated policies because the previous policy could have filtered some networks out, or changed their attributes, and you do not remember the original attributes or the filtered routes anymore.
Yet, this functionality is crucial whenever you update your inbound BGP policies because these policies have to be applied to all inbound route information from that neighbor. The original BGPv4 specification did not specify any means by which a router could ask its BGP peer to resend its routes.
0 kommentar(er)
