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Example: cross connect ppp interfaces

r1: 

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hostname r1
buggy
!
logging file debug ../binTmp/zzz83r1-log.run
!
vrf definition tester
 exit
!
vrf definition v1
 rd 1:1
 exit
!
interface serial1
 no description
 encapsulation ppp
 ppp ip4cp close
 ppp ip6cp close
 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
!
!
end

r2: 

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hostname r2
buggy
!
logging file debug ../binTmp/zzz83r2-log.run
!
vrf definition tester
 exit
!
interface serial1
 no description
 encapsulation ppp
 no shutdown
 no log-link-change
 exit
!
interface serial2
 no description
 encapsulation ppp
 no shutdown
 no log-link-change
 exit
!
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connect con
 side1 serial1
 side2 serial2
 exit
!
server telnet tester
 security protocol telnet
 no exec authorization
 no login authentication
 vrf tester
 exit
!
!
end

r3: 

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hostname r3
buggy
!
logging file debug ../binTmp/zzz83r3-log.run
!
vrf definition tester
 exit
!
vrf definition v1
 rd 1:1
 exit
!
interface serial1
 no description
 encapsulation ppp
 ppp ip4cp close
 ppp ip6cp close
 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
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
server telnet tester
 security protocol telnet
 no exec authorization
 no login authentication
 vrf tester
 exit
!
!
end