Skip to content

Example: bgp routemap filtering with nexthop

Alt text

r1

hostname r1
vrf def v1
 rd 1:1
 exit
bridge 1
 mac-learn
 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
 bridge-gr 1
 exit
int eth2
 bridge-gr 1
 exit
int bvi1
 vrf for v1
 ipv4 addr 1.1.1.1 255.255.255.0
 ipv6 addr 1234:1::1 ffff:ffff::
 exit
route-map rm1
 sequence 10 act deny
  match nexthop 1.1.1.3
 sequence 20 act permit
 exit
route-map rm2
 sequence 10 act deny
  match nexthop 1234:1::3
 sequence 20 act permit
 exit
router bgp4 1
 vrf v1
 no safe-ebgp
 address uni
 local-as 1
 router-id 4.4.4.1
 neigh 1.1.1.2 remote-as 2
 neigh 1.1.1.2 route-server
 neigh 1.1.1.2 route-map-out rm1
 neigh 1.1.1.3 remote-as 3
 neigh 1.1.1.3 route-server
 neigh 1.1.1.3 route-map-out rm1
 red conn
 exit
router bgp6 1
 vrf v1
 no safe-ebgp
 address uni
 local-as 1
 router-id 6.6.6.1
 neigh 1234:1::2 remote-as 2
 neigh 1234:1::2 route-server
 neigh 1234:1::2 route-map-out rm2
 neigh 1234:1::3 remote-as 3
 neigh 1234:1::3 route-server
 neigh 1234:1::3 route-map-out rm2
 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 eth1
 vrf for v1
 ipv4 addr 1.1.1.2 255.255.255.0
 ipv6 addr 1234:1::2 ffff:ffff::
 exit
router bgp4 1
 vrf v1
 no safe-ebgp
 address uni
 local-as 2
 router-id 4.4.4.2
 neigh 1.1.1.1 remote-as 1
 red conn
 exit
router bgp6 1
 vrf v1
 no safe-ebgp
 address uni
 local-as 2
 router-id 6.6.6.2
 neigh 1234:1::1 remote-as 1
 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 eth1
 vrf for v1
 ipv4 addr 1.1.1.3 255.255.255.0
 ipv6 addr 1234:1::3 ffff:ffff::
 exit
router bgp4 1
 vrf v1
 no safe-ebgp
 address uni
 local-as 3
 router-id 4.4.4.3
 neigh 1.1.1.1 remote-as 1
 red conn
 exit
router bgp6 1
 vrf v1
 no safe-ebgp
 address uni
 local-as 3
 router-id 6.6.6.3
 neigh 1234:1::1 remote-as 1
 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
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
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
  1. Install ContainerLab as described here
  2. Fetch rout-bgp531 file
  3. Launch ContainerLab rout-bgp531.yml topology: 

   containerlab deploy --topo rout-bgp531.yml
4. Destroy ContainerLab rout-bgp531.yml topology: 

   containerlab destroy --topo rout-bgp531.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-bgp531.tst file here
  3. Launch rout-bgp531.tst test: 

   java -jar ../../rtr.jar test tester rout-bgp531 path ./ temp ./ wait
4. Destroy freeRtr rout-bgp531.tst test: 

   Ctrl-C (In freeRtr test window)