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Example: bgp change in locpref with soft-reconfig

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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 soft-reconfig
 neigh 1.1.1.2 route-reflect
 neigh 1.1.1.3 remote-as 1
 neigh 1.1.1.3 soft-reconfig
 neigh 1.1.1.3 route-reflect
 neigh 1.1.1.4 remote-as 1
 neigh 1.1.1.4 soft-reconfig
 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 soft-reconfig
 neigh 1234:1::2 route-reflect
 neigh 1234:1::3 remote-as 1
 neigh 1234:1::3 soft-reconfig
 neigh 1234:1::3 route-reflect
 neigh 1234:1::4 remote-as 1
 neigh 1234:1::4 soft-reconfig
 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 locpref 4000-6000
 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 soft-reconfig
 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 soft-reconfig
 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 locpref 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 soft-reconfig
 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 soft-reconfig
 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 locpref 2000-4000
 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 soft-reconfig
 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 soft-reconfig
 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 locpref 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 locpref 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 locpref 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-bgp123 file
  3. Launch ContainerLab rout-bgp123.yml topology: 

   containerlab deploy --topo rout-bgp123.yml
4. Destroy ContainerLab rout-bgp123.yml topology: 

   containerlab destroy --topo rout-bgp123.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-bgp123.tst file here
  3. Launch rout-bgp123.tst test: 

   java -jar ../../rtr.jar test tester rout-bgp123 path ./ temp ./ wait
4. Destroy freeRtr rout-bgp123.tst test: 

   Ctrl-C (In freeRtr test window)