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Example: qos ingress ttl set

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r1

hostname r1
vrf def v1
 rd 1:1
 exit
policy-map p1
 seq 10 act drop
  match ttl 100-150
 seq 20 act trans
 exit
int eth1
 vrf for v1
 ipv4 addr 1.1.1.1 255.255.255.0
 ipv6 addr 1234::1 ffff::
 service-policy-in p1
 exit
ipv4 route v1 0.0.0.0 0.0.0.0 1.1.1.2
ipv6 route v1 :: :: 1234::2

r2

hostname r2
vrf def v1
 rd 1:1
 exit
policy-map p1
 seq 10 act trans
  match length 300-500
  set ttl 123
 seq 20 act trans
  set ttl 12
 exit
int eth1
 vrf for v1
 ipv4 addr 1.1.1.2 255.255.255.0
 ipv6 addr 1234::2 ffff::
 service-policy-in p1
 exit
int eth2
 vrf for v1
 ipv4 addr 2.2.2.1 255.255.255.0
 ipv6 addr 4321::1 ffff::
 service-policy-in p1
 exit

r3

hostname r3
vrf def v1
 rd 1:1
 exit
policy-map p1
 seq 10 act drop
  match ttl 100-150
 seq 20 act trans
 exit
int eth1
 vrf for v1
 ipv4 addr 2.2.2.2 255.255.255.0
 ipv6 addr 4321::2 ffff::
 service-policy-in p1
 exit
ipv4 route v1 0.0.0.0 0.0.0.0 2.2.2.1
ipv6 route v1 :: :: 4321::1

r1 tping 100 5 2.2.2.2 vrf v1 siz 200
r3 tping 100 5 1.1.1.1 vrf v1 siz 200
r1 tping 100 5 4321::2 vrf v1 siz 200
r3 tping 100 5 1234::1 vrf v1 siz 200
r1 tping 0 5 2.2.2.2 vrf v1 siz 400
r3 tping 0 5 1.1.1.1 vrf v1 siz 400
r1 tping 0 5 4321::2 vrf v1 siz 400
r3 tping 0 5 1234::1 vrf v1 siz 400
r1 tping 100 5 2.2.2.2 vrf v1 siz 600
r3 tping 100 5 1.1.1.1 vrf v1 siz 600
r1 tping 100 5 4321::2 vrf v1 siz 600
r3 tping 100 5 1234::1 vrf v1 siz 600
  1. Install ContainerLab as described here
  2. Fetch qos-set11 file
  3. Launch ContainerLab qos-set11.yml topology: 

   containerlab deploy --topo qos-set11.yml
4. Destroy ContainerLab qos-set11.yml topology: 

   containerlab destroy --topo qos-set11.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 qos-set11.tst file here
  3. Launch qos-set11.tst test: 

   java -jar ../../rtr.jar test tester qos-set11 path ./ temp ./ wait
4. Destroy freeRtr qos-set11.tst test: 

   Ctrl-C (In freeRtr test window)