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Example: bgp change in extended community

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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 eth1
 vrf for v1
 ipv4 addr 1.1.1.1 255.255.255.0
 ipv6 addr 1234:1::1 ffff:ffff::
 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
 neigh 1.1.1.2 send-comm both
 neigh 1.1.1.2 route-reflect
 neigh 1.1.1.3 remote-as 1
 neigh 1.1.1.3 send-comm both
 neigh 1.1.1.3 route-reflect
 neigh 1.1.1.4 remote-as 1
 neigh 1.1.1.4 send-comm both
 neigh 1.1.1.4 route-reflect
 red conn
 exit
router bgp6 1
 vrf v1
 address uni
 local-as 1
 router-id 6.6.6.1
 neigh 1234:1::2 remote-as 1
 neigh 1234:1::2 send-comm both
 neigh 1234:1::2 route-reflect
 neigh 1234:1::3 remote-as 1
 neigh 1234:1::3 send-comm both
 neigh 1234:1::3 route-reflect
 neigh 1234:1::4 remote-as 1
 neigh 1234:1::4 send-comm both
 neigh 1234:1::4 route-reflect
 red conn
 exit

r2

hostname r2
vrf def v1
 rd 1:1
 exit
bridge 1
 mac-learn
 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
 bridge-gr 1
 exit
int eth2
 bridge-gr 1
 exit
int bvi1
 vrf for v1
 ipv4 addr 1.1.1.2 255.255.255.0
 ipv6 addr 1234:1::2 ffff:ffff::
 exit
route-map rm1
 sequence 10 act deny
 sequence 10 match extcomm 1:1234:5000
 sequence 20 act perm
 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 send-comm both
 neigh 1.1.1.1 route-map-in rm1
 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 send-comm both
 neigh 1234:1::1 route-map-in rm1
 red conn
 exit

r3

hostname r3
vrf def v1
 rd 1:1
 exit
bridge 1
 mac-learn
 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 eth1
 bridge-gr 1
 exit
int eth2
 bridge-gr 1
 exit
int bvi1
 vrf for v1
 ipv4 addr 1.1.1.3 255.255.255.0
 ipv6 addr 1234:1::3 ffff:ffff::
 exit
route-map rm1
 set extcomm 1:1234:1000
 exit
router bgp4 1
 vrf v1
 address uni
 local-as 1
 router-id 4.4.4.3
 neigh 1.1.1.1 remote-as 1
 neigh 1.1.1.1 send-comm both
 red conn route-map rm1
 exit
router bgp6 1
 vrf v1
 address uni
 local-as 1
 router-id 6.6.6.3
 neigh 1234:1::1 remote-as 1
 neigh 1234:1::1 send-comm both
 red conn route-map rm1
 exit

r4

hostname r4
vrf def v1
 rd 1:1
 exit
int lo0
 vrf for v1
 ipv4 addr 2.2.2.4 255.255.255.255
 ipv6 addr 4321::4 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
 exit
int eth1
 vrf for v1
 ipv4 addr 1.1.1.4 255.255.255.0
 ipv6 addr 1234:1::4 ffff:ffff::
 exit
route-map rm1
 sequence 10 act deny
 sequence 10 match extcomm 1:1234:3000
 sequence 20 act perm
 exit
router bgp4 1
 vrf v1
 address uni
 local-as 1
 router-id 4.4.4.4
 neigh 1.1.1.1 remote-as 1
 neigh 1.1.1.1 send-comm both
 neigh 1.1.1.1 route-map-in rm1
 red conn
 exit
router bgp6 1
 vrf v1
 address uni
 local-as 1
 router-id 6.6.6.4
 neigh 1234:1::1 remote-as 1
 neigh 1234:1::1 send-comm both
 neigh 1234:1::1 route-map-in rm1
 red conn
 exit

r1 tping 100 60 2.2.2.2 vrf v1
r1 tping 100 60 4321::2 vrf v1
r1 tping 100 60 2.2.2.3 vrf v1
r1 tping 100 60 4321::3 vrf v1
r1 tping 100 60 2.2.2.4 vrf v1
r1 tping 100 60 4321::4 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 2.2.2.4 vrf v1
r2 tping 100 60 4321::4 vrf v1
r3 tping 100 60 2.2.2.1 vrf v1
r3 tping 100 60 4321::1 vrf v1
r3 tping 100 60 2.2.2.2 vrf v1
r3 tping 100 60 4321::2 vrf v1
r3 tping 100 60 2.2.2.4 vrf v1
r3 tping 100 60 4321::4 vrf v1
r4 tping 100 60 2.2.2.1 vrf v1
r4 tping 100 60 4321::1 vrf v1
r4 tping 100 60 2.2.2.2 vrf v1
r4 tping 100 60 4321::2 vrf v1
r4 tping 100 60 2.2.2.3 vrf v1
r4 tping 100 60 4321::3 vrf v1
r3 send conf t
r3 send route-map rm1
r3 send set extcomm 1:1234:3000
r3 send end
r3 send clear ipv4 route v1
r3 send clear ipv6 route v1
r1 tping 100 60 2.2.2.2 vrf v1
r1 tping 100 60 4321::2 vrf v1
r1 tping 100 60 2.2.2.3 vrf v1
r1 tping 100 60 4321::3 vrf v1
r1 tping 100 60 2.2.2.4 vrf v1
r1 tping 100 60 4321::4 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 2.2.2.4 vrf v1
r2 tping 100 60 4321::4 vrf v1
r3 tping 100 60 2.2.2.1 vrf v1
r3 tping 100 60 4321::1 vrf v1
r3 tping 100 60 2.2.2.2 vrf v1
r3 tping 100 60 4321::2 vrf v1
r3 tping 100 60 2.2.2.4 vrf v1
r3 tping 100 60 4321::4 vrf v1
r4 tping 100 60 2.2.2.1 vrf v1
r4 tping 100 60 4321::1 vrf v1
r4 tping 100 60 2.2.2.2 vrf v1
r4 tping 100 60 4321::2 vrf v1
r4 tping 0 60 2.2.2.3 vrf v1
r4 tping 0 60 4321::3 vrf v1
r3 send conf t
r3 send route-map rm1
r3 send set extcomm 1:1234:5000
r3 send end
r3 send clear ipv4 route v1
r3 send clear ipv6 route v1
r1 tping 100 60 2.2.2.2 vrf v1
r1 tping 100 60 4321::2 vrf v1
r1 tping 100 60 2.2.2.3 vrf v1
r1 tping 100 60 4321::3 vrf v1
r1 tping 100 60 2.2.2.4 vrf v1
r1 tping 100 60 4321::4 vrf v1
r2 tping 100 60 2.2.2.1 vrf v1
r2 tping 100 60 4321::1 vrf v1
r2 tping 0 60 2.2.2.3 vrf v1
r2 tping 0 60 4321::3 vrf v1
r2 tping 100 60 2.2.2.4 vrf v1
r2 tping 100 60 4321::4 vrf v1
r3 tping 100 60 2.2.2.1 vrf v1
r3 tping 100 60 4321::1 vrf v1
r3 tping 100 60 2.2.2.2 vrf v1
r3 tping 100 60 4321::2 vrf v1
r3 tping 100 60 2.2.2.4 vrf v1
r3 tping 100 60 4321::4 vrf v1
r4 tping 100 60 2.2.2.1 vrf v1
r4 tping 100 60 4321::1 vrf v1
r4 tping 100 60 2.2.2.2 vrf v1
r4 tping 100 60 4321::2 vrf v1
r4 tping 100 60 2.2.2.3 vrf v1
r4 tping 100 60 4321::3 vrf v1
r3 send conf t
r3 send route-map rm1
r3 send set extcomm 1:1234:1000
r3 send end
r3 send clear ipv4 route v1
r3 send clear ipv6 route v1
r1 tping 100 60 2.2.2.2 vrf v1
r1 tping 100 60 4321::2 vrf v1
r1 tping 100 60 2.2.2.3 vrf v1
r1 tping 100 60 4321::3 vrf v1
r1 tping 100 60 2.2.2.4 vrf v1
r1 tping 100 60 4321::4 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 2.2.2.4 vrf v1
r2 tping 100 60 4321::4 vrf v1
r3 tping 100 60 2.2.2.1 vrf v1
r3 tping 100 60 4321::1 vrf v1
r3 tping 100 60 2.2.2.2 vrf v1
r3 tping 100 60 4321::2 vrf v1
r3 tping 100 60 2.2.2.4 vrf v1
r3 tping 100 60 4321::4 vrf v1
r4 tping 100 60 2.2.2.1 vrf v1
r4 tping 100 60 4321::1 vrf v1
r4 tping 100 60 2.2.2.2 vrf v1
r4 tping 100 60 4321::2 vrf v1
r4 tping 100 60 2.2.2.3 vrf v1
r4 tping 100 60 4321::3 vrf v1
  1. Install ContainerLab as described here
  2. Fetch rout-bgp122 file
  3. Launch ContainerLab rout-bgp122.yml topology: 

   containerlab deploy --topo rout-bgp122.yml
4. Destroy ContainerLab rout-bgp122.yml topology: 

   containerlab destroy --topo rout-bgp122.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-bgp122.tst file here
  3. Launch rout-bgp122.tst test: 

   java -jar ../../rtr.jar test tester rout-bgp122 path ./ temp ./ wait
4. Destroy freeRtr rout-bgp122.tst test: 

   Ctrl-C (In freeRtr test window)