D-Link DGS-3630 Emulator 1 - Page 191
bgp cluster-id, MI and EI Mode Only
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DGS-3630 Layer 3 Stackable Managed Switch CLI Reference Guide Use the bgp client-to-client reflection command on the route reflector to enable reflection of routes received from the clients to other clients. If the clients are already fully meshed, use the no bgp client-to-client reflection command to disable client-to-client reflection because route reflection is not required. Example This example shows how to configure the local router is a route reflector with three neighbors as the clients. The client to client reflection is enabled to enable the route reflection. Switch# configure terminal Switch(config)# router bgp 100 Switch(config-router)#neighbor 10.20.0.1 route-reflector-client Switch(config-router)#neighbor 10.20.0.2 route-reflector-client Switch(config-router)#neighbor 10.20.0.3 route-reflector-client Switch(config-router)# bgp client-to-client reflection Switch(config-router)# 13-14 bgp cluster-id (MI and EI Mode Only) This command is used to set the cluster ID in a route reflector cluster. Use the no form of this command to remove the cluster ID. bgp cluster-id CLUSTER-ID no bgp cluster-id Parameters CLUSTER-ID Specifies to configure the cluster ID in the IPv4 address format Default The local router ID of the route reflector is used as the cluster ID when no ID is specified Command Mode Router Configuration Mode. Command Default Level Level: 12. Usage Guideline In a large scale BGP network, route reflection is a mechanism used to reduce the needs of fully mesh of iBGP sessions. With route reflection, an autonomous system can be partitioned into a number of clusters; each cluster is formed by the route reflector and its client. The connection between clusters is still fully meshed. However, in a cluster, the reflector needs to maintain connections with all clients, but the client does not need to maintain connections with other clients. The route reflector is responsible to reflect routes received from one client to other clients. Each cluster is distinguished by a cluster ID. The cluster ID configured on the route reflector is the ID of the cluster. When cluster ID is not configured on the route reflector, the router ID of the reflector will be the cluster ID. In a cluster, the user can define multiple route reflectors to provide redundancy and avoid the single point of failure, but these route reflectors must be configured with the same cluster ID. Use the bgp cluster-id command on the route reflector to configure the cluster ID on these route reflectors. 186
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