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Example: ppp with tacacs authentication

r1: 

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hostname r1
buggy
!
logging file debug ../binTmp/zzz91r1-log.run
!
vrf definition tester
 exit
!
vrf definition v1
 rd 1:1
 exit
!
interface serial1
 no description
 encapsulation ppp
 ppp username c
 ppp password $v10$Yw==
 ppp ip4cp close
 ppp ip6cp close
 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
!
!
end

r2: 

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hostname r2
buggy
!
logging file debug ../binTmp/zzz91r2-log.run
!
aaa tacacs usr
 secret $v10$Yw==
 server 2.2.2.2
 exit
!
vrf definition tester
 exit
!
vrf definition v1
 rd 1:1
 exit
!
interface ethernet1
 no description
 vrf forwarding v1
 ipv4 address 2.2.2.1 255.255.255.0
 no shutdown
 no log-link-change
 exit
!
interface serial1
 no description
 encapsulation ppp
 ppp authentication usr
 ppp refuseauth chap
 ppp refuseauth eap
 ppp ip4cp close
 ppp ip6cp close
 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
!
proxy-profile p1
 vrf v1
 exit
!
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!
server telnet tester
 security protocol telnet
 no exec authorization
 no login authentication
 vrf tester
 exit
!
client proxy p1
!
end

r3: 

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hostname r3
buggy
!
logging file debug ../binTmp/zzz91r3-log.run
!
aaa userlist usr
 username c
 username c password $v10$Yw==
 exit
!
vrf definition tester
 exit
!
vrf definition v1
 rd 1:1
 exit
!
interface ethernet1
 no description
 vrf forwarding v1
 ipv4 address 2.2.2.2 255.255.255.0
 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 tacacs rad
 authentication usr
 no authorization
 secret $v10$Yw==
 logging
 vrf v1
 exit
!
!
end