Basic BGP Configuration (BGP Part-2 CCNP)

BGP Basic Configuration

  v  R2 interfaces Configuration:-

Ø  interface FastEthernet0/0

Ø   description CONNECTED WITH SW1

Ø   ip address 192.192.12.2 255.255.255.0

Ø   no shut

Ø   exit

  v  R1 interfaces Configuration:-

Ø   interface FastEthernet0/0

Ø   description CONNECTED WITH SW1

Ø   ip address 192.192.12.1 255.255.255.0

Ø   no shut

Ø   exit

Ø  interface Serial0/0

Ø   description CONNECTED WITH R1

Ø   ip address 192.192.1.2 255.255.255.252

Ø   clock rate 2000000

Ø   no shut

Ø   exit

Ø  interface Serial0/1

Ø   description CONNECTED WITH RELIANCE_ISP

Ø   ip address 192.192.1.6 255.255.255.252

Ø   clock rate 2000000

Ø   no shut

Ø   exit

  v  Airtel_ISP Interfaces Configuration:-

Ø  interface Serial0/0

Ø   description CONNECTED WITH R1

Ø   ip address 192.192.1.1 255.255.255.252

Ø   clock rate 64000

Ø   no shut

Ø   exit

Ø  interface Serial0/1

Ø   description CONNECTED WITH VODAFONE_ISP

Ø   ip address 200.200.1.5 255.255.255.252

Ø   clock rate 2000000

Ø   no shut

Ø   exit

  v  Reliance_ISP interface Configuration:-

Ø   interface Serial0/0

Ø   description CONNECTED WITH VODAFONE_ISP

Ø   ip address 200.200.1.1 255.255.255.252

Ø   clock rate 2000000

Ø   no shut

Ø   exit

Ø  interface Serial0/1

Ø   description CONNECTED WITH R1

Ø   ip address 192.192.1.5 255.255.255.252

Ø   clock rate 2000000

Ø   no shut

Ø   exit

  v  Vodafone_ISP interfaces Configuration:-

Ø  interface Serial0/0

Ø   description CONNECTED WITH RELIANCE_ISP

Ø   ip address 200.200.1.2 255.255.255.252

Ø   clock rate 2000000

Ø   no shut

Ø   exit

Ø  interface Serial0/1

Ø   description CONNECTED WITH AIRTEL_ISP

Ø   ip address 200.200.1.6 255.255.255.252

Ø   clock rate 2000000

Ø   no shut

Ø   exit

Terms:-

Ø  {Remote-as:-Specify a BGP neighbor Autonomous No. {AS No} 

Ø  BGP Synchronization:- Do not use or advertise a route learned via IBGP until the same route has been learned from the internal routing protocol

Ø  BGP next-hop-processing:-

ü  For EBGP peers:- change next hop address on advertised routes

ü  For IBGP peers:-do not change next hop address on advertise routes

  v  R2 BGP Configuration:-

Ø  R1(config)# router bgp 65001

Ø   no synchronization

Ø   bgp router-id 2.2.2.2

Ø   network 192.192.12.0 mask 255.255.255.0

Ø   neighbor 192.192.12.1 remote-as 65001

Ø   neighbor 192.192.12.1 description R1

Ø   no auto-summary

  v  R1 BGP Configuration:-

Ø  R2(config)#router bgp 65001

Ø   no synchronization

Ø   bgp router-id 1.1.1.1

Ø   network 192.192.1.0 mask 255.255.255.252

Ø   network 192.192.1.4 mask 255.255.255.252

Ø   neighbor 192.192.1.1 remote-as 65002                        

Ø   neighbor 192.192.1.1 description AIRTEL_ISP

Ø   neighbor 192.192.1.5 remote-as 65004

Ø   neighbor 192.192.1.5 description RELIANCE_ISP

Ø   neighbor 192.192.12.2 remote-as 65001

Ø   neighbor 192.192.12.2 description R2

Ø   no auto-summary

  v  Airtel_ISP BGP Configuration:-

Ø  Airtel_ISP(config)#router bgp 65002

Ø  no synchronization

Ø   bgp router-id 3.3.3.3

Ø   network 192.192.1.0 mask 255.255.255.252

Ø   network 200.200.1.4 mask 255.255.255.252

Ø   neighbor 192.192.1.2 remote-as 65001

Ø   neighbor 192.192.1.2 description R1

Ø   neighbor 200.200.1.6 remote-as 65003

Ø   neighbor 200.200.1.6 description VODAFONE_ISP

Ø   no auto-summary

  v  Reliance_ISP Configuration:-

Ø  Reliance_ISP (config)#router bgp 65004

Ø  no synchronization

Ø   bgp router-id 4.4.4.4

Ø   network 192.192.1.4 mask 255.255.255.252

Ø   network 200.200.1.0 mask 255.255.255.252

Ø   neighbor 192.192.1.6 remote-as 65001

Ø   neighbor 192.192.1.6 description R1

Ø   neighbor 200.200.1.2 remote-as 65003

Ø   neighbor 200.200.1.2 description VODAFONE_ISP

Ø   no auto-summary

  v  Vodafone_ISP {BGP} Configuration:-

Ø  Vodafone_ISP (config)#router bgp 65003

Ø  no synchronization

Ø   bgp router-id 5.5.5.5

Ø   network 200.200.1.0 mask 255.255.255.252

Ø   network 200.200.1.4 mask 255.255.255.252

Ø   neighbor 200.200.1.1 remote-as 65004

Ø   neighbor 200.200.1.1 description RELIANCE_ISP

Ø   neighbor 200.200.1.5 remote-as 65002

Ø   neighbor 200.200.1.5 description AIRTEL_ISP

Ø   no auto-summary

Troubleshooting & Verification Commands:-

Ø  show ip route

Ø  show ip interface brief

Ø  show ip bgp summary         {Shows BGP neighbor}

Ø  show ip bgp                          {Shows BGP network information}

Ø  show ip bgp neighbor

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