The following route reflection example configures a single route reflector with two clients all of which are members of AS 1. Router 1 is the route reflector. Routers 2 and 3 are route reflector clients. Router 2 has an EBGP connection to Router 4 of AS 2. Router 3 has an EBGP connection to Router 5 of AS 3. Routers 2 and 3 advertise all their routes to Router 1. Router 1 advertises routes learned from Router 2 to Router 3 and routes learned from Router 3 to Router 2.
BGP Route Reflection Example Topology displays the BGP route reflection topology for this example.
Router 1
Router 1(rw)->configure Router 1(rw-config)->interface vlan 1 Router 1(rw-config-intf-vlan.0.1)->ip address 200.10.1.1 255.255.255.0 Router 1(rw-config-intf-vlan.0.1)->no shutdown Router 1(rw-config-intf-vlan.0.1)->exit Router 1(rw)->configure Router 1(rw-config)->interface vlan 2 Router 1(rw-config-intf-vlan.0.2)->ip address 200.10.2.1 255.255.255.0 Router 1(rw-config-intf-vlan.0.2)->no shutdown Router 1(rw-config-intf-vlan.0.2)->exit Router 1(rw)->configure Router 1(rw-config)->router bgp 1 Router 1(su-config-bgp)->bgp router-id 1.1.1.1 Router 1(su-config-bgp)->bgp cluster-id 1.1.1.1 Router 1(su-config-bgp)->neighbor 200.10.1.2 remote-as 1 Router 1(su-config-bgp)->neighbor 200.10.1.2 route-reflector-client Router 1(su-config-bgp)->neighbor 200.10.2.2 remote-as 1 Router 1(su-config-bgp)->neighbor 200.10.2.2 route-reflector-client Router 1(su-config-bgp)->redistribute static Router 1(su-config-bgp)->
Router 2
Router 2(rw)->configure Router 2(rw-config)->interface vlan 1 Router 2(rw-config-intf-vlan.0.1)->ip address 200.10.1.2 255.255.255.0 Router 2(rw-config-intf-vlan.0.1)->no shutdown Router 2(rw-config-intf-vlan.0.1)->exit Router 2(rw)->configure Router 2(rw-config)->interface vlan 3 Router 2(rw-config-intf-vlan.0.2)->ip address 200.10.3.1 255.255.255.0 Router 2(rw-config-intf-vlan.0.2)->no shutdown Router 2(rw-config-intf-vlan.0.2)->exit Router 2(rw)->configure Router 2(rw-config)->router bgp 1 Router 2(su-config-bgp)->bgp router-id 2.2.2.2 Router 2(su-config-bgp)->neighbor 200.10.1.1 remote-as 1 Router 2(su-config-bgp)->neighbor 200.10.3.2 remote-as 2 Router 2(su-config-bgp)->redistribute static Router 2(su-config-bgp)->
Router 3
Router 3(rw)->configure Router 3(rw-config)->interface vlan 2 Router 3(rw-config-intf-vlan.0.2)->ip address 200.10.2.2 255.255.255.0 Router 3(rw-config-intf-vlan.0.2)->no shutdown Router 3(rw-config-intf-vlan.0.2)->exit Router 3(rw)->configure Router 3(rw-config)->interface vlan 4 Router 3(rw-config-intf-vlan.0.4)->ip address 200.10.4.1 255.255.255.0 Router 3(rw-config-intf-vlan.0.4)->no shutdown Router 3(rw-config-intf-vlan.0.4)->exit Router 3(rw)->configure Router 3(rw-config)->router bgp 1 Router 3(su-config-bgp)->bgp router-id 3.3.3.3 Router 3(su-config-bgp)->neighbor 200.10.2.1 remote-as 1 Router 3(su-config-bgp)->neighbor 200.10.4.2 remote-as 3 Router 3(su-config-bgp)->redistribute static Router 3(su-config-bgp)->
Router 4
Router 4(rw)->configure Router 4(rw-config)->interface vlan 3 Router 4(rw-config-intf-vlan.0.3)->ip address 200.10.3.2 255.255.255.0 Router 4(rw-config-intf-vlan.0.3)->no shutdown Router 4(rw-config-intf-vlan.0.3)->exit Router 4(rw)->configure Router 4(rw-config)->router bgp 2 Router 4(su-config-bgp)->bgp router-id 4.4.4.4 Router 4(su-config-bgp)->neighbor 200.10.3.1 remote-as 1 Router 4(su-config-bgp)->redistribute static Router 4(su-config-bgp)->
Router 5
Router 5(rw)->configure Router 5(rw-config)->interface vlan 4 Router 5(rw-config-intf-vlan.0.4)->ip address 200.10.4.2 255.255.255.0 Router 5(rw-config-intf-vlan.0.4)->no shutdown Router 5(rw-config-intf-vlan.0.4)->exit Router 5(rw)->configure Router 5(rw-config)->router bgp 3 Router 5(su-config-bgp)->bgp router-id 5.5.5.5 Router 5(su-config-bgp)->neighbor 200.10.4.1 remote-as 1 Router 5(su-config-bgp)->redistribute static Router 5(su-config-bgp)->
Configuring BGP Route Reflection describes how to configure BGP route reflection.
Configuring BGP Route Reflection
| Step | Task | Command(s) |
|---|---|---|
| 1 | In BGP configuration mode, specify that the router will act as a route reflector for the specified neighbor. | neighbor ip-address route-reflector-client |
| 2 | In BGP configuration mode, specify the route reflection cluster ID for the cluster the route reflector belongs to. This value defaults to the route reflector router ID if only a single route reflector is configured for the cluster, otherwise a cluster ID must be specified. | bgp cluster-id router-id |
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