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Example: p4lang downlink

r1: 

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hostname r1
buggy
!
logging file debug ../binTmp/zzz95r1-log.run
!
vrf definition tester
 exit
!
vrf definition v1
 rd 1:1
 exit
!
interface ethernet1
 no description
 no shutdown
 no log-link-change
 exit
!
interface ethernet2
 no description
 no shutdown
 no log-link-change
 exit
!
interface sdn1
 no description
 mtu 1500
 macaddr 003b.0d58.5741
 vrf forwarding v1
 ipv4 address 1.1.1.1 255.255.255.0
 ipv6 address 1234::1 ffff::
 no shutdown
 no log-link-change
 exit
!
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server telnet tester
 security protocol telnet
 no exec authorization
 no login authentication
 vrf tester
 exit
!
server p4lang p4
 export-vrf v1 1
 export-port sdn1 1 0 0 0 0
 interconnect ethernet1
 downlink 9 ethernet2
 vrf v1
 exit
!
!
end

r2: 

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hostname r2
buggy
!
logging file debug ../binTmp/zzz95r2-log.run
!
hairpin 1
 exit
!
hairpin 2
 exit
!
vrf definition tester
 exit
!
vrf definition v1
 rd 1:1
 exit
!
interface ethernet1
 no description
 no shutdown
 no log-link-change
 exit
!
interface hairpin11
 no description
 no shutdown
 no log-link-change
 exit
!
interface hairpin12
 no description
 vrf forwarding v1
 ipv4 address 1.1.1.2 255.255.255.0
 ipv6 address 1234::2 ffff::
 no shutdown
 no log-link-change
 exit
!
interface hairpin21
 no description
 no shutdown
 no log-link-change
 exit
!
interface hairpin22
 no description
 vrf forwarding v1
 ipv4 address 2.2.2.2 255.255.255.0
 ipv6 address 4321::2 ffff::
 no shutdown
 no log-link-change
 exit
!
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server telnet tester
 security protocol telnet
 no exec authorization
 no login authentication
 vrf tester
 exit
!
server pktmux pm
 cpuport ethernet1
 dataport hairpin11 1
 dataport hairpin21 9
 exit
!
!
end

r3: 

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hostname r3
buggy
!
logging file debug ../binTmp/zzz95r3-log.run
!
vrf definition tester
 exit
!
vrf definition v1
 rd 1:1
 exit
!
interface ethernet1
 no description
 no shutdown
 no log-link-change
 exit
!
interface sdn1
 no description
 mtu 1500
 macaddr 006a.0c58.2149
 vrf forwarding v1
 ipv4 address 2.2.2.1 255.255.255.0
 ipv6 address 4321::1 ffff::
 no shutdown
 no log-link-change
 exit
!
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server telnet tester
 security protocol telnet
 no exec authorization
 no login authentication
 vrf tester
 exit
!
server p4lang p4
 export-vrf v1 1
 export-port sdn1 9 0 0 0 0
 interconnect ethernet1
 vrf v1
 exit
!
!
end