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I-BGP USING FULL MESH NEIGHBORSHIP & BGP SPLIT HORIZON RULE - LAB

 I-BGP USING FULL MESH NEIGHBORSHIP & BGP SPLIT HORIZON RULE






Assign the basic IP Addressing as per the routers!

Router>enable Router#configure terminal Router(config)#hostname R-1

R-1(config)#interface gig0/0

R-1(config-if)#ip add 1.1.1.1 255.0.0.0

R-1(config-if)#no shut R-1(config-if)#exit

R-1(config)#interface gig0/1

R-1(config-if)#ip add 4.4.4.2 255.0.0.0

R-1(config-if)#no shut R-1(config-if)#exit

R-1(config)#interface gig0/2

R-1(config-if)#ip add 10.1.1.1 255.0.0.0

R-1(config-if)#no shut R-1(config-if)#exit
.


Router>enable Router#configure terminal Router(config)#hostname R-2

R-2(config)#interface gig0/0

R-2(config-if)#ip add 1.1.1.2 255.0.0.0

R-2(config-if)#no shut R-2(config-if)#exit

R-2(config)#int gig0/1

R-2(config-if)#ip add 2.2.2.1 255.0.0.0

R-2(config-if)#no shut R-2(config-if)#exit

R-2(config)#interface gig0/2

R-2(config-if)#ip add 20.1.1.1 255.0.0.0

R-2(config-if)#no shut R-2(config-if)#exit

Router>enable Router#configure terminal Router(config)#hostname R-3

R-3(config)#interface gig0/0

R-3(config-if)#ip add 2.2.2.2 255.0.0.0

R-3(config-if)#no shut R-3(config-if)#exit

R-3(config)#int gig0/1

R-3(config-if)#ip add 3.3.3.1 255.0.0.0

R-3(config-if)#no shut R-3(config-if)#exit

R-3(config)#int gig0/2

R-3(config-if)#ip add 30.1.1.1 255.0.0.0

R-3(config-if)#no shut R-3(config-if)#exit

& Now finally the last which IP implementations of R-4

Router>enable Router#configure terminal Router(config)#hostname R-4

R-4(config)#interface gig0/0

R-4(config-if)#ip add 4.4.4.1 255.0.0.0

R-4(config-if)#no shut R-4(config-if)#exit


R-4(config)#int gig0/1

R-4(config-if)#ip add 3.3.3.2 255.0.0.0

R-4(config-if)#no shut R-4(config-if)#exit

R-4(config)#int gig0/2

R-4(config-if)#ip add 40.1.1.1 255.0.0.0

R-4(config-if)#no shut R-4(config-if)#exit


Now we’ll implement I-BGP on all the routers.

R-1(config)#router bgp 500 R-1(config-router)#no sync R-1(config-router)#no auto-sum

R-1(config-router)#neighbor 1.1.1.2 remote-as 500

R-1(config-router)#neighbor 4.4.4.1 remote-as 500

R-1(config-router)#network 1.0.0.0

R-1(config-router)#network 4.0.0.0

R-1(config-router)#network 10.0.0.0

R-1(config-router)#exit




R-2(config)#router bgp 500

R-2(config-router)#no auto-sum

R-2(config-router)#no sync

R-2(config-router)#neighbor 2.2.2.2 remote-as 500

R-2(config-router)#neighbor 1.1.1.1 remote-as 500

R-2(config-router)#network 1.0.0.0

R-2(config-router)#network 20.0.0.0

R-2(config-router)#network 2.0.0.0



R-3(config)#router bgp 500

R-3(config-router)#no auto-sum

R-3(config-router)#no sync

R-3(config-router)#neighbor 3.3.3.2 remote-as 500

R-3(config-router)#neighbor 2.2.2.1 remote-as 500

R-3(config-router)#network 2.0.0.0

R-3(config-router)#network 3.0.0.0

R-3(config-router)#network 30.0.0.0



R-4(config)#router bgp 500

R-4(config-router)#no auto-sum

R-4(config-router)#no sync

R-4(config-router)#neighbor 4.4.4.2 remote-as 500

R-4(config-router)#neighbor 3.3.3.1 remote-as 500

R-4(config-router)#network 4.0.0.0

R-4(config-router)#network 3.0.0.0

R-4(config-router)#network 40.0.0.0





So, as per the implementations of i-BGP we can see that there’s a trouble in our verifications which is that –

R-1 is not having the routing entry for the network 30.0.0.0 which is on R-3. 
R-3 is not having the routing entry for the network 10.0.0.0 which is on R-1. 
R-2 is not having the routing entry for the network 40.0.0.0 which is on R-4. 
R-4 is not having the routing entry for the network 20.0.0.0 which is on R-2.

Now as per this, the routes are shared via the directly connected neighbors.

But something we discussed “BGP Split Horizon Rule” is here –

By-default as per i-BGP the default rule says that an update sent by one i-BGP neighbor should not be sent back to another i-BGP neighbor.

To overcome this cause, we’ll use full-mesh neighborship.

R-1(config)#router bgp 500

R-1(config-router)#neighbor 2.2.2.2 remote-as 500

R-3(config)#router bgp 500

R-3(config-router)#neighbor 1.1.1.1 remote-as 500

R-3(config-router)#exit



& here’s the routing table verification after defining full-mesh neighborship between R-1 & R-3

#BGP #cisco #lab #practice #learn #useful

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