Route reflectors (RR) configuration

Route reflectors (RR) are one method to eliminate the full mesh of IBGP peers in your network. The route reflector allows all IBGP speakers within your autonomous system to learn about the available routes without creating loops.

Route reflectors (RR) to advertise routes received from iBGP peers to other iBGP peers. All the valid clients update server Route Reflector-RR and server update to all the valid clients.
Each client only establishes a neighbor relationship with servers, client are not allowed to establish neighbors with other clients. Route reflectors (RR)(servers) establish neighbor relationships with other servers (if you have more the one server) and clients.

let see the configuration:-

Topology:-

Task:

configure the topology as per the diagram.
configure the EIGRP 100 and advertise all the interfaces as per the diagram.
configure BGP 111 using loopback.
configure router 2 as Route Reflector.

R1#configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

R1(config)#Interface fastethernet 0/0

R1(config-if)#Ip address 10.1.1.1 255.0.0.0

R1(config-if)#No shutdown

R1(config-if)#No keepalive

R1(config-if)#Exit

R1(config)#Interface serial 3/0

R1(config-if)#Ip address 1.1.1.1 255.0.0.0

R1(config-if)#No shutdown

R1(config-if)#Exit

R1(config)#Interface loopback 0

R1(config-if)#Ip address 11.0.0.1 255.255.255.0

R1(config-if)#Exit

R1(config)#Interface loopback 1

R1(config-if)#Ip address 11.0.1.1 255.255.255.0

R1(config-if)#Exit

R1(config)#Interface loopback 2

R1(config-if)#Ip address 11.0.2.1 255.255.255.0

R1(config-if)#Exit

R1(config)#Interface loopback 3

R1(config-if)#Ip address 11.0.3.1 255.255.255.0

R1(config-if)#Exit

*Nov 23 07:51:46.435: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to up

*Nov 23 07:51:46.839: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1, changed state to up

*Nov 23 07:51:47.187: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback2, changed state to up

*Nov 23 07:51:47.443: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback3, changed state to up

*Nov 23 07:51:47.819: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

*Nov 23 07:51:48.259: %LINK-3-UPDOWN: Interface Serial3/0, changed state to up

*Nov 23 07:51:49.267: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/0, changed state to up

*Nov 23 07:51:53.495: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up

*Nov 23 07:52:13.519: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/0, changed state to down

*Nov 23 07:55:43.503: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/0, changed state to up

R2#configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

R2(config)#Interface fastethernet 0/0

R2(config-if)#Ip address 20.1.1.1 255.0.0.0

R2(config-if)#No shutdown

R2(config-if)#No keepalive

R2(config-if)#Exit

R2(config)#Interface serial 3/0

R2(config-if)#Ip address 1.1.1.2 255.0.0.0

R2(config-if)#No shutdown

R2(config-if)#Exit

R2(config)#Interface serial 3/1

R2(config-if)#Ip address 2.2.2.1 255.0.0.0

R2(config-if)#No shutdown

R2(config-if)#Exit

R2(config)#Interface serial 3/2

R2(config-if)#Ip address 4.4.4.2 255.0.0.0

R2(config-if)#No shutdown

R2(config-if)#Exit

R2(config)#Interface serial 3/3

R2(config-if)#Ip address 5.5.5.2 255.0.0.0

R2(config-if)#No shutdown

R2(config-if)#Exit

R2(config)#

R2(config)#Interface loopback 0

R2(config-if)#Ip address 12.0.0.1 255.255.255.0

R2(config-if)#Exit

R2(config)#Interface loopback 1

R2(config-if)#Ip address 12.0.1.1 255.255.255.0

R2(config-if)#Exit

R2(config)#Interface loopback 2

R2(config-if)#Ip address 12.0.2.1 255.255.255.0

R2(config-if)#Exit

R2(config)#Interface loopback 3

R2(config-if)#Ip address 12.0.3.1 255.255.255.0

*Nov 23 07:55:38.351: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to up

*Nov 23 07:55:38.759: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1, changed state to up

*Nov 23 07:55:39.043: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback2, changed state to up

*Nov 23 07:55:39.203: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to upExit

*Nov 23 07:55:39.319: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback3, changed state to up

*Nov 23 07:55:39.571: %LINK-3-UPDOWN: Interface Serial3/0, changed state to up

*Nov 23 07:55:39.819: %LINK-3-UPDOWN: Interface Serial3/1, changed state to up

*Nov 23 07:55:39.971: %LINK-3-UPDOWN: Interface Serial3/2, changed state to up

*Nov 23 07:55:40.171: %LINK-3-UPDOWN: Interface Serial3/3, changed state to up

*Nov 23 07:55:40.579: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/0, changed state to up

*Nov 23 07:55:40.827: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/1, changed state to up

*Nov 23 07:55:40.979: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/2, changed state to up

*Nov 23 07:55:41.179: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/3, changed state to up

*Nov 23 07:55:42.731: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up

*Nov 23 07:56:02.755: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/1, changed state to down

*Nov 23 07:56:02.767: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/2, changed state to down

*Nov 23 07:56:02.775: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/3, changed state to down

*Nov 23 07:57:52.731: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/1, changed state to up

*Nov 23 07:59:02.755: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/2, changed state to up

*Nov 23 08:01:12.755: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/3, changed state to up

R3(config)#Interface fastethernet 0/0

R3(config-if)#Ip address 30.1.1.1 255.0.0.0

R3(config-if)#No shutdown

R3(config-if)#No keepalive

R3(config-if)#Exit

R3(config)#Interface serial 3/1

R3(config-if)#Ip address 2.2.2.2 255.0.0.0

R3(config-if)#No shutdown

R3(config-if)#Exit

R3(config)#Interface loopback 0

R3(config-if)#Ip address 13.0.0.1 255.255.255.0

R3(config-if)#Exit

R3(config)#Interface loopback 1

R3(config-if)#Ip address 13.0.1.1 255.255.255.0

R3(config-if)#Exit

R3(config)#Interface loopback 2

R3(config-if)#Ip address 13.0.2.1 255.255.255.0

R3(config-if)#Exit

R3(config)#Interface loopback 3

R3(config-if)#Ip address 13.0.3.1 255.255.255.0

R3(config-if)#Exit

*Nov 23 07:57:34.835: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to up

*Nov 23 07:57:35.235: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1, changed state to up

*Nov 23 07:57:35.519: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback2, changed state to up

*Nov 23 07:57:35.779: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback3, changed state to up

*Nov 23 07:57:36.167: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

*Nov 23 07:57:36.655: %LINK-3-UPDOWN: Interface Serial3/1, changed state to up

*Nov 23 07:57:37.667: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/1, changed state to up

*Nov 23 07:57:42.931: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up

R4(config)#Interface fastethernet 0/0

R4(config-if)#Ip address 40.1.1.1 255.0.0.0

R4(config-if)#No shutdown

R4(config-if)#No keepalive

R4(config-if)#Exit

R4(config)#Interface serial 3/2

R4(config-if)#Ip address 4.4.4.1 255.0.0.0

R4(config-if)#No shutdown

R4(config-if)#Exit

R4(config)#Interface loopback 0

R4(config-if)#Ip address 14.0.0.1 255.255.255.0

R4(config-if)#Exit

R4(config)#Interface loopback 1

R4(config-if)#Ip address 14.0.1.1 255.255.255.0

R4(config-if)#Exit

R4(config)#Interface loopback 2

R4(config-if)#Ip address 14.0.2.1 255.255.255.0

R4(config-if)#Exit

R4(config)#Interface loopback 3

R4(config-if)#Ip address 14.0.3.1 255.255.255.0

R4(config-if)#Exit

R5#configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

R5(config)#Interface fastethernet 0/0

R5(config-if)#Ip address 50.1.1.1 255.0.0.0

R5(config-if)#No shutdown

R5(config-if)#No keepalive

R5(config-if)#Exit

R5(config)#Interface serial 3/3

R5(config-if)#Ip address 5.5.5.1 255.0.0.0

R5(config-if)#No shutdown

R5(config-if)#Exit

R5(config)#Interface loopback 0

R5(config-if)#Ip address 15.0.0.1 255.255.255.0

R5(config-if)#Exit

R5(config)#Interface loopback 1

R5(config-if)#Ip address 15.0.1.1 255.255.255.0

R5(config-if)#Exit

R5(config)#Interface loopback 2

R5(config-if)#Ip address 15.0.2.1 255.255.255.0

R5(config-if)#Exit

R5(config)#Interface loopback 3

R5(config-if)#Ip address 15.0.3.1 255.255.255.0

R5(config-if)#Exit

*Nov 23 08:00:55.291: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to up

*Nov 23 08:00:55.695: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1, changed state to up

*Nov 23 08:00:55.975: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback2, changed state to up

*Nov 23 08:00:56.235: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback3, changed state to up

*Nov 23 08:00:56.731: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

*Nov 23 08:00:57.111: %LINK-3-UPDOWN: Interface Serial3/3, changed state to up

*Nov 23 08:00:58.119: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/3, changed state to up

*Nov 23 08:01:03.491: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up

R1#show ip interface brief

Interface IP-Address OK? Method Status Protocol

FastEthernet0/0 10.1.1.1 YES manual up up

Serial3/0 1.1.1.1 YES manual up up

Loopback0 11.0.0.1 YES manual up up

Loopback1 11.0.1.1 YES manual up up

Loopback2 11.0.2.1 YES manual up up

Loopback3 11.0.3.1 YES manual up up

R2#show ip interface brief

Interface IP-Address OK? Method Status Protocol

FastEthernet0/0 20.1.1.1 YES manual up up

Serial3/0 1.1.1.2 YES manual up up

Serial3/1 2.2.2.1 YES manual up up

Serial3/2 4.4.4.2 YES manual up up

Serial3/3 5.5.5.2 YES manual up up

Loopback0 12.0.0.1 YES manual up up

Loopback1 12.0.1.1 YES manual up up

Loopback2 12.0.2.1 YES manual up up

Loopback3 12.0.3.1 YES manual up up

R3#show ip interface brief

Interface IP-Address OK? Method Status Protocol

FastEthernet0/0 30.1.1.1 YES manual up up

Serial3/1 2.2.2.2 YES manual up up

Loopback0 13.0.0.1 YES manual up up

Loopback1 13.0.1.1 YES manual up up

Loopback2 13.0.2.1 YES manual up up

Loopback3 13.0.3.1 YES manual up up

R4#show ip interface brief

Interface IP-Address OK? Method Status Protocol

FastEthernet0/0 40.1.1.1 YES manual up up

Serial3/2 4.4.4.1 YES manual up up

Loopback0 14.0.0.1 YES manual up up

Loopback1 14.0.1.1 YES manual up up

Loopback2 14.0.2.1 YES manual up up

Loopback3 14.0.3.1 YES manual up up

R5#show ip interface brief

Interface IP-Address OK? Method Status Protocol

FastEthernet0/0 50.1.1.1 YES manual up up

Serial3/3 5.5.5.1 YES manual up up

Loopback0 15.0.0.1 YES manual up up

Loopback1 15.0.1.1 YES manual up up

Loopback2 15.0.2.1 YES manual up up

Loopback3 15.0.3.1 YES manual up up

R1(config)#router eigrp 100

R1(config-router)#network 1.0.0.0

R1(config-router)#network 10.0.0.0

R1(config-router)#network 11.0.0.0

R1(config-router)#no auto-summary

R1(config-router)#exit

*Nov 23 08:16:17.099: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 1.1.1.2 (Serial3/0) is up: new adjacency

R2(config)#router eigrp 100

R2(config-router)#network 20.0.0.0

R2(config-router)#network 12.0.0.0

R2(config-router)#network 1.0.0.0

R2(config-router)#network 2.0.0.0

R2(config-router)#network 4.0.0.0

R2(config-router)#network 5.0.0.0

R2(config-router)#no auto-summary

R2(config-router)#exit

*Nov 23 08:24:58.667: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 5.5.5.1 (Serial3/3) is up: new adjacency

*Nov 23 08:16:17.147: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 1.1.1.1 (Serial3/0) is up: new adjacency

R3(config)#router eigrp 100

R3(config-router)#network 2.0.0.0

R3(config-router)#network 30.0.0.0

R3(config-router)#network 13.0.0.0

R3(config-router)#no auto-summary

R3(config-router)#exit

*Nov 23 08:17:10.491: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 2.2.2.1 (Serial3/1) is up: new adjacency

R4(config)#router eigrp 100

R4(config-router)#network 40.0.0.0

R4(config-router)#network 4.0.0.0

R4(config-router)#network 14.0.0.0

R4(config-router)#no auto-summary

R4(config-router)#exit

*Nov 23 08:23:22.447: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 4.4.4.2 (Serial3/2) is up: new adjacency

R5(config)#router eigrp 100

R5(config-router)#network 50.0.0.0

R5(config-router)#network 5.0.0.0

R5(config-router)#network 15.0.0.0

R5(config-router)#no auto-summary

R5(config-router)#exit

*Nov 23 08:24:58.803: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 5.5.5.2 (Serial3/3) is up: new adjacency

R1(config)#router bgp 111

R1(config-router)#neighbor 12.0.0.1 remote-as 111

R1(config-router)#neighbor 12.0.0.1 update-source loo

R1(config-router)#neighbor 12.0.0.1 update-source loopback 0

R1(config-router)#network 10.0.0.0

R1(config-router)#no auto-summary

R1(config-router)#no synchronization

R1(config-router)#exit

*Nov 23 08:32:17.911: %BGP-5-ADJCHANGE: neighbor 12.0.0.1 Up

*Nov 23 08:34:17.763: %BGP-5-NBR_RESET: Neighbor 12.0.0.1 reset (Peer closed the session)

*Nov 23 08:34:17.767: %BGP-5-ADJCHANGE: neighbor 12.0.0.1 Down Peer closed the session

*Nov 23 08:34:17.767: %BGP_SESSION-5-ADJCHANGE: neighbor 12.0.0.1 IPv4 Unicast topology base removed from session Peer closed the session

*Nov 23 08:34:18.671: %BGP-5-ADJCHANGE: neighbor 12.0.0.1 Up

R2(config-router)#router bgp 111

R2(config-router)#neighbor 11.0.0.1 update-source loopback 0

R2(config-router)#neighbor 13.0.0.1 remote-as 111

R2(config-router)#neighbor 13.0.0.1 update-source loopback 0

R2(config-router)#neighbor 14.0.0.1 remote-as 111

R2(config-router)#neighbor 14.0.0.1 update-source loopback 0

R2(config-router)#neighbor 15.0.0.1 remote-as 111

R2(config-router)#neighbor 15.0.0.1 update-source loopback 0

R2(config-router)#neighbor 15.0.0.1 route-reflector-client

R2(config-router)#neighbor 14.0.0.1 route-reflector-client

R2(config-router)#neighbor 13.0.0.1 route-reflector-client

R2(config-router)#neighbor 11.0.0.1 route-reflector-client

*Nov 23 08:34:17.739: %BGP-5-ADJCHANGE: neighbor 11.0.0.1 Down RR client config change

*Nov 23 08:34:17.743: %BGP_SESSION-5-ADJCHANGE: neighbor 11.0.0.1 IPv4 Unicast topology base removed from session RR client config change

*Nov 23 08:34:18.611: %BGP-5-ADJCHANGE: neighbor 11.0.0.1 Up

R2(config-router)#network 20.0.0.0

R2(config-router)#no auto-summary

R2(config-router)#exit

*Nov 23 08:39:56.611: %BGP-5-ADJCHANGE: neighbor 13.0.0.1 Up

*Nov 23 08:41:13.355: %BGP-5-ADJCHANGE: neighbor 14.0.0.1 Up

*Nov 23 08:42:22.071: %BGP-5-ADJCHANGE: neighbor 15.0.0.1 Up

R3(config)#router bgp 111

R3(config-router)#neighbor 12.0.0.1 remote-as 111

*Nov 23 08:39:56.675: %BGP-5-ADJCHANGE: neighbor 12.0.0.1 Up

R3(config-router)#neighbor 12.0.0.1 update-source loopback 0

R3(config-router)#network 30.0.0.0

R3(config-router)#no auto-summary

R3(config-router)#no synchronization

R3(config-router)#exit

R4(config)#router bgp 111

R4(config-router)#neighbor 12.0.0.1 remote

R4(config-router)#neighbor 12.0.0.1 remote-as 111

*Nov 23 08:41:13.131: %BGP-5-ADJCHANGE: neighbor 12.0.0.1 Up

R4(config-router)#neighbor 12.0.0.1 update-source loopback 0

R4(config-router)#network 40.0.0.0

R4(config-router)#no auto-summary

R4(config-router)#no synchronization

R4(config-router)#exit

R5(config)#router bgp 111

R5(config-router)#neighbor 12.0.0.1 remote-as 111

R5(config-router)#neighbor 12.0.0.1 update-source loopback 0

*Nov 23 08:42:22.327: %BGP-5-ADJCHANGE: neighbor 12.0.0.1 Up

R5(config-router)#network 50.0.0.0

R5(config-router)#no auto-summary

R5(config-router)#no synchronization

R5(config-router)#exit

From Router 1

From Router 2

From Router 3

From Router 4

From Router 5

R1#ping 20.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 36/91/148 ms

R1#ping 30.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 30.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 96/112/136 ms

R1#ping 40.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 40.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 84/110/132 ms

R1#ping 50.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 50.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 68/100/124 ms

R2#ping 10.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/59/108 ms

R2#ping 30.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 30.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/55/108 ms

R2#ping 40.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 40.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/56/120 ms

R2#ping 50.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 50.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 40/78/136 ms

R3#ping 10.1.1.1