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Example: ibgp over loopback

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r1

hostname r1
vrf def v1
 rd 1:1
 exit
int lo0
 vrf for v1
 ipv4 addr 2.2.2.1 255.255.255.255
 ipv6 addr 4321::1 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
 exit
int lo1
 vrf for v1
 ipv4 addr 2.2.2.11 255.255.255.255
 ipv6 addr 4321::11 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
 exit
int eth1
 vrf for v1
 ipv4 addr 1.1.1.1 255.255.255.252
 ipv6 addr 1234:1::1 ffff:ffff::
 exit
ipv4 route v1 2.2.2.2 255.255.255.255 1.1.1.2
ipv4 route v1 2.2.2.3 255.255.255.255 1.1.1.2
ipv6 route v1 4321::2 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff 1234:1::2
ipv6 route v1 4321::3 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff 1234:1::2
router bgp4 1
 vrf v1
 address uni
 local-as 1
 router-id 4.4.4.1
 neigh 2.2.2.2 remote-as 1
 neigh 2.2.2.2 update lo0
 red conn
 exit
router bgp6 1
 vrf v1
 address uni
 local-as 1
 router-id 6.6.6.1
 neigh 4321::2 remote-as 1
 neigh 4321::2 update lo0
 red conn
 exit

r2

hostname r2
vrf def v1
 rd 1:1
 exit
int lo0
 vrf for v1
 ipv4 addr 2.2.2.2 255.255.255.255
 ipv6 addr 4321::2 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
 exit
int lo1
 vrf for v1
 ipv4 addr 2.2.2.12 255.255.255.255
 ipv6 addr 4321::12 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
 exit
int eth1
 vrf for v1
 ipv4 addr 1.1.1.2 255.255.255.252
 ipv6 addr 1234:1::2 ffff:ffff::
 exit
int eth2
 vrf for v1
 ipv4 addr 1.1.1.5 255.255.255.252
 ipv6 addr 1234:2::1 ffff:ffff::
 exit
ipv4 route v1 2.2.2.1 255.255.255.255 1.1.1.1
ipv4 route v1 2.2.2.3 255.255.255.255 1.1.1.6
ipv6 route v1 4321::1 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff 1234:1::1
ipv6 route v1 4321::3 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff 1234:2::2
router bgp4 1
 vrf v1
 address uni
 local-as 1
 router-id 4.4.4.2
 neigh 2.2.2.1 remote-as 1
 neigh 2.2.2.1 update lo0
 neigh 2.2.2.1 route-reflect
 neigh 2.2.2.3 remote-as 1
 neigh 2.2.2.3 update lo0
 neigh 2.2.2.3 route-reflect
 red conn
 exit
router bgp6 1
 vrf v1
 address uni
 local-as 1
 router-id 6.6.6.2
 neigh 4321::1 remote-as 1
 neigh 4321::1 update lo0
 neigh 4321::1 route-reflect
 neigh 4321::3 remote-as 1
 neigh 4321::3 update lo0
 neigh 4321::3 route-reflect
 red conn
 exit

r3

hostname r3
vrf def v1
 rd 1:1
 exit
int lo0
 vrf for v1
 ipv4 addr 2.2.2.3 255.255.255.255
 ipv6 addr 4321::3 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
 exit
int lo1
 vrf for v1
 ipv4 addr 2.2.2.13 255.255.255.255
 ipv6 addr 4321::13 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
 exit
int eth1
 vrf for v1
 ipv4 addr 1.1.1.6 255.255.255.252
 ipv6 addr 1234:2::2 ffff:ffff::
 exit
ipv4 route v1 2.2.2.1 255.255.255.255 1.1.1.5
ipv4 route v1 2.2.2.2 255.255.255.255 1.1.1.5
ipv6 route v1 4321::1 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff 1234:2::1
ipv6 route v1 4321::2 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff 1234:2::1
router bgp4 1
 vrf v1
 address uni
 local-as 1
 router-id 4.4.4.3
 neigh 2.2.2.2 remote-as 1
 neigh 2.2.2.2 update lo0
 red conn
 exit
router bgp6 1
 vrf v1
 address uni
 local-as 1
 router-id 6.6.6.3
 neigh 4321::2 remote-as 1
 neigh 4321::2 update lo0
 red conn
 exit

r1 tping 100 60 2.2.2.2 vrf v1
r1 tping 100 60 2.2.2.3 vrf v1
r1 tping 100 60 4321::2 vrf v1
r1 tping 100 60 4321::3 vrf v1
r1 tping 100 60 2.2.2.12 vrf v1
r1 tping 100 60 2.2.2.13 vrf v1
r1 tping 100 60 4321::12 vrf v1
r1 tping 100 60 4321::13 vrf v1
r2 tping 100 60 2.2.2.1 vrf v1
r2 tping 100 60 2.2.2.3 vrf v1
r2 tping 100 60 4321::3 vrf v1
r2 tping 100 60 4321::1 vrf v1
r2 tping 100 60 2.2.2.11 vrf v1
r2 tping 100 60 2.2.2.13 vrf v1
r2 tping 100 60 4321::11 vrf v1
r2 tping 100 60 4321::13 vrf v1
r3 tping 100 60 2.2.2.1 vrf v1
r3 tping 100 60 2.2.2.2 vrf v1
r3 tping 100 60 4321::1 vrf v1
r3 tping 100 60 4321::2 vrf v1
r3 tping 100 60 2.2.2.11 vrf v1
r3 tping 100 60 2.2.2.12 vrf v1
r3 tping 100 60 4321::11 vrf v1
r3 tping 100 60 4321::12 vrf v1
  1. Install ContainerLab as described here
  2. Fetch rout-bgp010 file
  3. Launch ContainerLab rout-bgp010.yml topology: 

   containerlab deploy --topo rout-bgp010.yml
4. Destroy ContainerLab rout-bgp010.yml topology: 

   containerlab destroy --topo rout-bgp010.yml
5. Copy-paste configuration for each node in the lab topology

  1. Fetch or compile freeRtr rtr.jar file.
    You can grab it here
  2. Fetch rout-bgp010.tst file here
  3. Launch rout-bgp010.tst test: 

   java -jar ../../rtr.jar test tester rout-bgp010 path ./ temp ./ wait
4. Destroy freeRtr rout-bgp010.tst test: 

   Ctrl-C (In freeRtr test window)