Router Configurations:
R1 Configuration:
Enable IPv6 routing:
R1(config)# ipv6 unicast-routing

Configure interfaces:
R1(config)# interface f0/0
R1(config-if)# ip address 192.168.1.1 255.255.255.0
R1(config-if)# no shutdown

R1(config)# interface s1/0
R1(config-if)# ip address 10.0.0.1 255.255.255.252
R1(config-if)# no shutdown

R1(config)# interface s1/1
R1(config-if)# ip address 10.0.2.1 255.255.255.252
R1(config-if)# no shutdown

R1(config)# interface loopback0
R1(config-if)# ip address 1.1.1.1 255.255.255.255
R1(config-if)# ipv6 address 2001:1::1/128
R1(config-if)# no shutdown

Configure BGP:
R1(config)# router bgp 100
R1(config-router)# bgp log-neighbor-changes

R1(config-router)# address-family ipv4 unicast
R1(config-router-af)# network 1.1.1.1 mask 255.255.255.255
R1(config-router-af)# neighbor 192.168.1.2 remote-as 200
R1(config-router-af)# neighbor 192.168.1.2 activate
R1(config-router-af)# neighbor 10.0.0.2 remote-as 300
R1(config-router-af)# neighbor 10.0.0.2 activate
R1(config-router-af)# neighbor 10.0.2.2 remote-as 300
R1(config-router-af)# neighbor 10.0.2.2 activate
R1(config-router-af)# exit-address-family

Configure IPv6 BGP neighbors and networks:
R1(config-router)# address-family ipv6 unicast
R1(config-router-af)# network 2001:1::1/128
R1(config-router-af)# neighbor 192.168.1.2 activate
R1(config-router-af)# neighbor 10.0.0.2 activate
R1(config-router-af)# neighbor 10.0.2.2 activate
R1(config-router-af)# exit-address-family 

R2 Configuration


! Configure interfaces
interface g3/0
 ip address 192.168.1.2 255.255.255.0
 no shutdown

interface g4/0
 ip address 192.168.2.1 255.255.255.0
 no shutdown

interface loopback0
 ip address 10.1.2.192 255.255.255.255
 ipv6 address 2001:2::2/128
 no shutdown

interface loopback1
 ip address 10.1.2.192 255.255.255.255
 ipv6 address 2001:2::2/128
 no shutdown


router bgp 200
 bgp log-neighbor-changes

 
 address-family ipv4 unicast
  network 2.2.2.2 mask 255.255.255.255
 neighbor 192.168.1.1 remote-as 100
neighbor 192.168.1.1 activate
 exit-address-family

 
 address-family ipv6 unicast
  network 2001:2::2/128
  neighbor 192.168.1.1 activate
 exit-address-family
________________________________________
R3 Configuration

interface g1/0
 ip address 192.168.3.1 255.255.255.0
 no shutdown

interface s1/0
 ip address 10.0.0.2 255.255.255.252
 no shutdown

interface s1/1
 ip address 10.0.2.2 255.255.255.252
 no shutdown

interface loopback0
 ip address 3.3.3.3 255.255.255.255
 ipv6 address 2001:3::3/128
 no shutdown

interface loopback1
 ip address 3.3.3.3 255.255.255.255
 ipv6 address 2001:3::3/128
 no shutdown

router bgp 300
 bgp log-neighbor-changes

 
 address-family ipv4 unicast
  network 3.3.3.3 mask 255.255.255.255
  neighbor 10.0.0.1 remote-as 100
neighbor 10.0.0.1 activate
  neighbor 10.0.2.1 remote-as 100
neighbor 10.0.2.1 activate
 exit-address-family

 
 address-family ipv6 unicast
  network 2001:3::3/128
  neighbor 10.0.0.1 activate
  neighbor 10.0.2.1 activate
 exit-address-family

Verification Commands:
1. Check Interface Status

show ip interface brief

2. Verify BGP Neighbors

show ip bgp summary
show bgp ipv6 unicast summary

3. Test Connectivity

ping 2.2.2.2
ping 3.3.3.3
ping 2001:2::2
ping 2001:3::3

4. Display BGP Routes

show ip bgp
show bgp ipv6 unicast