Basic BGP Configuration

1. Basic BGP Configuration
www.netprotocolxpert.in

3. R2 interfaces Configuration:-
 interface FastEthernet0/0
description CONNECTED WITH SW1
 ip address 192.192.12.2 255.255.255.0
 no shut
 exit

4. R1 interfaces Configuration:-
 interface FastEthernet0/0
description CONNECTED WITH SW1
 ip address 192.192.12.1 255.255.255.0
 no shut
 exit
 interface Serial0/0
description CONNECTED WITH R1
 ip address 192.192.1.2 255.255.255.252
 clock rate 2000000
 no shut
 exit
 interface Serial0/1
description CONNECTED WITH RELIANCE_ISP
 ip address 192.192.1.6 255.255.255.252
 clock rate 2000000
 no shut
 exit

5. Airtel_ISP Interfaces Configuration:-
 interface Serial0/0
description CONNECTED WITH R1
 ip address 192.192.1.1 255.255.255.252
 clock rate 64000
 no shut
 exit
 interface Serial0/1
description CONNECTED WITH VODAFONE_ISP
 ip address 200.200.1.5 255.255.255.252
 clock rate 2000000
 no shut
 exit

6. Reliance_ISP interface Configuration:-
 interface Serial0/0
description CONNECTED WITH VODAFONE_ISP
 ip address 200.200.1.1 255.255.255.252
 clock rate 2000000
 no shut
 exit
 interface Serial0/1
description CONNECTED WITH R1
 ip address 192.192.1.5 255.255.255.252
 clock rate 2000000
 no shut
 exit

7. Vodafone_ISP interfaces Configuration:-
 interface Serial0/0
description CONNECTED WITH RELIANCE_ISP
 ip address 200.200.1.2 255.255.255.252
 clock rate 2000000
 no shut
 exit
 interface Serial0/1
description CONNECTED WITH AIRTEL_ISP
 ip address 200.200.1.6 255.255.255.252
 clock rate 2000000
 no shut
 exit

8. Terms:-
 {Remote-as:-Specify a BGP neighbor Autonomous No.
{AS No}
 BGP Synchronization:- Do not use or advertise a route
learned via IBGP until the same route has been learned
from the internal routing protocol
 BGP next-hop-processing:-
◦ For EBGP peers:- change next hop address on advertised routes
◦ For IBGP peers:-do not change next hop address on advertise
routes

9. R2 BGP Configuration:-
 R1(config)# router bgp 65001
 no synchronization
 bgp router-id 2.2.2.2
 network 192.192.12.0 mask 255.255.255.0
 neighbor 192.192.12.1 remote-as 65001
 neighbor 192.192.12.1 description R1
 no auto-summary

10. R1 BGP Configuration:-
 R2(config)#router bgp 65001
 no synchronization
 bgp router-id 1.1.1.1
 network 192.192.1.0 mask 255.255.255.252
 network 192.192.1.4 mask 255.255.255.252
 neighbor 192.192.1.1 remote-as 65002
 neighbor 192.192.1.1 description AIRTEL_ISP
 neighbor 192.192.1.5 remote-as 65004
 neighbor 192.192.1.5 description RELIANCE_ISP
 neighbor 192.192.12.2 remote-as 65001
 neighbor 192.192.12.2 description R2
 no auto-summary

11. Airtel_ISP BGP Configuration:-
 Airtel_ISP(config)#router bgp 65002
 no synchronization
 bgp router-id 3.3.3.3
 network 192.192.1.0 mask 255.255.255.252
 network 200.200.1.4 mask 255.255.255.252
 neighbor 192.192.1.2 remote-as 65001
 neighbor 192.192.1.2 description R1
 neighbor 200.200.1.6 remote-as 65003
 neighbor 200.200.1.6 description VODAFONE_ISP
 no auto-summary

12. Reliance_ISP Configuration:-
 Reliance_ISP (config)#router bgp 65004
 no synchronization
 bgp router-id 4.4.4.4
 network 192.192.1.4 mask 255.255.255.252
 network 200.200.1.0 mask 255.255.255.252
 neighbor 192.192.1.6 remote-as 65001
 neighbor 192.192.1.6 description R1
 neighbor 200.200.1.2 remote-as 65003
 neighbor 200.200.1.2 description VODAFONE_ISP
 no auto-summary

13. Vodafone_ISP {BGP} Configuration:-
 Vodafone_ISP (config)#router bgp 65003
 no synchronization
 bgp router-id 5.5.5.5
 network 200.200.1.0 mask 255.255.255.252
 network 200.200.1.4 mask 255.255.255.252
 neighbor 200.200.1.1 remote-as 65004
 neighbor 200.200.1.1 description RELIANCE_ISP
 neighbor 200.200.1.5 remote-as 65002
 neighbor 200.200.1.5 description AIRTEL_ISP
 no auto-summary

14. Troubleshooting & Verification Commands:-
 show ip route
 show ip interface brief
 show ip bgp summary
 show ip bgp
 show ip bgp neighbor