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Example: precise mtu enforcement

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r1

hostname r1
vrf def v1
 rd 1:1
 exit
int ser1
 mtu 1500
 enforce-mtu both
 vrf for v1
 ipv4 addr 1.1.1.1 255.255.255.0
 ipv6 addr 1234::1 ffff::
 exit

r2

hostname r2
vrf def v1
 rd 1:1
 exit
int ser1
 mtu 1500
 enforce-mtu both
 vrf for v1
 ipv4 addr 1.1.1.2 255.255.255.0
 ipv6 addr 1234::2 ffff::
 exit

r1 tping 100 15 1.1.1.2 vrf v1 siz 1500
r2 tping 100 15 1.1.1.1 vrf v1 siz 1500
r1 tping 100 15 1234::2 vrf v1 siz 1500
r2 tping 100 15 1234::1 vrf v1 siz 1500
r1 tping 0 15 1.1.1.2 vrf v1 siz 1501
r2 tping 0 15 1.1.1.1 vrf v1 siz 1501
r1 tping 0 15 1234::2 vrf v1 siz 1501
r2 tping 0 15 1234::1 vrf v1 siz 1501
  1. Install ContainerLab as described here
  2. Fetch conn-frag03 file
  3. Launch ContainerLab conn-frag03.yml topology: 

   containerlab deploy --topo conn-frag03.yml
4. Destroy ContainerLab conn-frag03.yml topology: 

   containerlab destroy --topo conn-frag03.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 conn-frag03.tst file here
  3. Launch conn-frag03.tst test: 

   java -jar ../../rtr.jar test tester conn-frag03 path ./ temp ./ wait
4. Destroy freeRtr conn-frag03.tst test: 

   Ctrl-C (In freeRtr test window)