Border Gateway Protocol | 229Use the show config command in CONFIGURATION ROUTER BGP mode and show ipas-path-access-list command in EXEC Privilege mode to view which commands are configured.Include this filter permit .* in your AS-PATH ACL to forward all routes not meeting the AS-PATH ACLcriteria.Configure BGP route reflectorsBGP route reflectors are intended for Autonomous Systems with a large mesh and they reduce the amountof BGP control traffic. With route reflection configured properly, IBGP routers are not fully meshed withina cluster but all receive routing information.Configure clusters of routers where one router is a concentration router and others are clients who receivetheir updates from the concentration router.Use the following commands in the CONFIGURATION ROUTER BGP mode to configure a routereflector.To view a route reflector configuration, use the show config command in the CONFIGURATIONROUTER BGP mode or show running-config bgp in EXEC Privilege mode.5 neighbor {ip-address |peer-group-name} filter-listas-path-name {in | out}CONFIG-ROUTER-BGP Filter routes based on the criteria in theconfigured route map. Configure the followingparameters:• ip-address or peer-group-name: enter theneighbor’s IP address or the peer group’sname.• as-path-name: enter the name of aconfigured AS-PATH ACL.• in: apply the AS-PATH ACL map to inboundroutes.• out: apply the AS-PATH ACL to outboundroutes.Note: Using Multipath and Add Path simultaneously in a Route Reflector is not recommended.Command Syntax Command Mode Purposebgp cluster-id cluster-id CONFIG-ROUTER-BGP Assign an ID to a router reflector cluster.You can have multiple clusters in an AS.neighbor {ip-address |peer-group-name}route-reflector-clientCONFIG-ROUTER-BGP Configure the local router as a route reflector and theneighbor or peer group identified is the route reflectorclient.Step Command Syntax Command Mode Purpose
