![]() ![]() Please note that other Pearson websites and online products and services have their own separate privacy policies. This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about Cisco Press products and services that can be purchased through this site. Rule #3: If a RR receives a route from an EBGP peer, it advertises the route to RR client(s) and non-RR client(s).įigure 1-10 demonstrates the route reflector rules. Even the RR client that sent the advertisement receives a copy of the route, but it discards the NLRI because it sees itself as the route originator. Rule #2: If a RR receives a NLRI from a RR client, it advertises the NLRI to RR client(s) and non-RR client(s). It does not advertise the NLRI to a non-route-reflector client. Rule #1: If a RR receives a NLRI from a non-RR client, the RR advertises the NLRI to a RR client. Three basic rules involve route reflectors and route reflection: The router reflecting routes is known as a route reflector (RR), and the router receiving reflected routes is a route reflector client. RFC 1966 introduces the concept that an IBGP peering can be configured so that it reflects routes to another IBGP peer. IBGP scalability becomes an issue for large networks. A full mesh topology of 5 routers requires 10 sessions, and a topology of 10 routers requires 45 sessions. ![]() The formula n(n-1)/2 provides the number of sessions required where n represents the number of routers. The inability for BGP to advertise a prefix learned from one IBGP peer to another IBGP peer can lead to scalability issues within an AS. ![]()
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