Basic BGP Route Reflection Configuration on Cisco Routers.

March 26, 2024
Posted by: Lyfey Technologies
Categories: Cisco, Networking

Configuration Steps:

Step 1: Configure hostnames and interface IPs on all the routers.

***************************************R1
enable
configure terminal
hostname R1
!
interface Loopback100
 ip address 100.100.100.100 255.255.255.255
!
interface FastEthernet0/0
 ip address 30.30.30.2 255.255.255.254
 no shutdown

!
interface FastEthernet0/1
 ip address 30.30.30.0 255.255.255.254
 no shutdown
!

*************************************RR1
enable
configure terminal
hostname RR1
!
interface FastEthernet0/0
 ip address 30.30.30.3 255.255.255.254
 no shutdown
!
interface FastEthernet0/1
 ip address 40.40.40.0 255.255.255.254
 no shutdown
!
interface FastEthernet1/0
 ip address 10.10.10.4 255.255.255.254
 no shutdown
!         
interface FastEthernet2/0
 ip address 10.10.10.0 255.255.255.254
 no shutdown
!

************************************RR2
enable
configure terminal
hostname RR2
!
interface FastEthernet0/0
 ip address 30.30.30.1 255.255.255.254
 no shutdown
!
interface FastEthernet0/1
 ip address 40.40.40.1 255.255.255.254
 no shutdown
!
interface FastEthernet1/0
 ip address 20.20.20.4 255.255.255.254
 no shutdown
!         
interface FastEthernet2/0
 ip address 20.20.20.0 255.255.255.254
 no shutdown
!

************************************R5
enable
configure terminal
hostname R5
!
interface FastEthernet0/0
 ip address 10.10.10.5 255.255.255.254
 no shutdown
!
interface FastEthernet0/1
 ip address 10.10.10.2 255.255.255.254
 no shutdown
!

**********************************R6
enable
configure terminal
hostname R6
!
interface FastEthernet0/0
 ip address 10.10.10.1 255.255.255.254
 no shutdown
!
interface FastEthernet0/1
 ip address 10.10.10.3 255.255.255.254
 no shutdown
!

************************************R7
enable
configure terminal
hostname R7
!
interface FastEthernet0/0
 ip address 20.20.20.5 255.255.255.254
 no shutdown
!

*********************************R8
enable
configure terminal
hostname R8
!
interface FastEthernet0/0
 ip address 20.20.20.1 255.255.255.254
 no shutdown
!

Step 2: Configure BGP on all the routers. R5 and R6 are configured as clients of RR1 while R7 and R8 are configured as clients of RR2. RR1 and RR2 are two different clusters. Interface IP is used as the cluster ID.

********************************R1
router bgp 64000

 neighbor 30.30.30.1 remote-as 64000
 neighbor 30.30.30.3 remote-as 64000
 !
 address-family ipv4
  neighbor 30.30.30.1 activate
  neighbor 30.30.30.3 activate

  network 100.100.100.100 mask 255.255.255.255
 exit-address-family
!

********************************RR1
router bgp 64000

 neighbor 10.10.10.1 remote-as 64000
 neighbor 10.10.10.5 remote-as 64000
 neighbor 30.30.30.2 remote-as 64000
 neighbor 40.40.40.1 remote-as 64000
 !
 address-family ipv4
  neighbor 10.10.10.1 activate
  neighbor 10.10.10.1 route-reflector-client
  neighbor 10.10.10.1 next-hop-self
  neighbor 10.10.10.5 activate
  neighbor 10.10.10.5 route-reflector-client
  neighbor 10.10.10.5 next-hop-self
  neighbor 30.30.30.2 activate
  neighbor 40.40.40.1 activate
  neighbor 40.40.40.1 route-reflector-client

 exit-address-family
!

*********************************RR2
router bgp 64000

 neighbor 20.20.20.1 remote-as 64000
 neighbor 20.20.20.5 remote-as 64000
 neighbor 30.30.30.0 remote-as 64000
 neighbor 40.40.40.0 remote-as 64000

 !
 address-family ipv4
  neighbor 20.20.20.1 activate
  neighbor 20.20.20.1 route-reflector-client
  neighbor 20.20.20.5 activate
  neighbor 20.20.20.5 route-reflector-client
  neighbor 30.30.30.0 activate
  neighbor 40.40.40.0 activate
  neighbor 40.40.40.0 route-reflector-client

 exit-address-family
!

********************************R5
router bgp 64000

 neighbor 10.10.10.4 remote-as 64000
 !
 address-family ipv4
  neighbor 10.10.10.4 activate

 exit-address-family
!

*******************************R6
router bgp 64000

 neighbor 10.10.10.0 remote-as 64000
 !
 address-family ipv4
  neighbor 10.10.10.0 activate

 exit-address-family
!

*******************************R7
router bgp 64000
 neighbor 20.20.20.4 remote-as 64000
 !
 address-family ipv4
  neighbor 20.20.20.4 activate

 exit-address-family
!

*******************************R8
router bgp 64000
 bgp log-neighbor-changes
 neighbor 20.20.20.0 remote-as 64000
 !
 address-family ipv4
  neighbor 20.20.20.0 activate
  no auto-summary
  no synchronization
 exit-address-family
!

Step 3: Confirm BGP peering status is Up on all the routers.