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Example: bgp aspath

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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 2.2.2.111 255.255.255.255
 ipv6 addr 4321::111 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
 exit
int lo2
 vrf for v1
 ipv4 addr 2.2.2.222 255.255.255.255
 ipv6 addr 4321::222 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
 exit
server telnet tel
 vrf v1
 port 666
 exit
int eth1
 vrf for v1
 ipv4 addr 1.1.1.1 255.255.255.252
 ipv6 addr 1234:1::1 ffff:ffff::
 exit
route-map rm1
 set aspath 1234
 exit
router bgp4 1
 vrf v1
 address uni
 local-as 1
 router-id 4.4.4.1
 neigh 1.1.1.2 remote-as 1
 red conn route-map rm1
 exit
router bgp6 1
 vrf v1
 address uni
 local-as 1
 router-id 6.6.6.1
 neigh 1234:1::2 remote-as 1
 red conn route-map rm1
 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 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
prefix-list p4
 sequence 10 deny 2.2.2.222/32
 sequence 20 permit 0.0.0.0/0 le 32
 exit
prefix-list p6
 sequence 10 deny 4321::222/128
 sequence 20 permit ::/0 le 128
 exit
router bgp4 1
 vrf v1
 address uni
 local-as 1
 router-id 4.4.4.2
 neigh 1.1.1.1 remote-as 1
 neigh 1.1.1.1 prefix-list-in p4
 neigh 1.1.1.6 remote-as 1
 neigh 1.1.1.6 prefix-list-in p4
 red conn
 exit
router bgp6 1
 vrf v1
 address uni
 local-as 1
 router-id 6.6.6.2
 neigh 1234:1::1 remote-as 1
 neigh 1234:1::1 prefix-list-in p6
 neigh 1234:2::2 remote-as 1
 neigh 1234:2::2 prefix-list-in p6
 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 2.2.2.111 255.255.255.255
 ipv6 addr 4321::111 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
route-map rm1
 set aspath 1234 1234 1234
 exit
router bgp4 1
 vrf v1
 address uni
 local-as 1
 router-id 4.4.4.3
 neigh 1.1.1.5 remote-as 1
 red conn route-map rm1
 exit
router bgp6 1
 vrf v1
 address uni
 local-as 1
 router-id 6.6.6.3
 neigh 1234:2::1 remote-as 1
 red conn route-map rm1
 exit

r1 tping 100 60 2.2.2.2 vrf v1
r1 tping 100 60 4321::2 vrf v1
r1 tping 0 60 2.2.2.3 vrf v1
r1 tping 0 60 4321::3 vrf v1
r3 tping 0 60 2.2.2.1 vrf v1
r3 tping 0 60 4321::1 vrf v1
r3 tping 100 60 2.2.2.2 vrf v1
r3 tping 100 60 4321::2 vrf v1
r2 tping 100 60 2.2.2.1 vrf v1
r2 tping 100 60 4321::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 2.2.2.111 vrf v1
r2 tping 100 60 4321::111 vrf v1
r2 tping 0 60 2.2.2.222 vrf v1
r2 tping 0 60 4321::222 vrf v1
r2 send telnet 2.2.2.111 666 vrf v1
r2 tping 100 60 2.2.2.222 vrf v1
r2 send exit
r2 read closed
r2 tping 0 60 2.2.2.222 vrf v1
r2 send telnet 4321::111 666 vrf v1
r2 tping 100 60 2.2.2.222 vrf v1
r2 send exit
r2 read closed
r2 tping 0 60 2.2.2.222 vrf v1
  1. Install ContainerLab as described here
  2. Fetch rout-bgp025 file
  3. Launch ContainerLab rout-bgp025.yml topology: 

   containerlab deploy --topo rout-bgp025.yml
4. Destroy ContainerLab rout-bgp025.yml topology: 

   containerlab destroy --topo rout-bgp025.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-bgp025.tst file here
  3. Launch rout-bgp025.tst test: 

   java -jar ../../rtr.jar test tester rout-bgp025 path ./ temp ./ wait
4. Destroy freeRtr rout-bgp025.tst test: 

   Ctrl-C (In freeRtr test window)