Post

Juniper Junos OS BGP basic configurations Part 2

Posted Updated
By Hector G Serrano 43 min read

This post is documents BGP configuration on Juniper Junos OS

This post documents BGP configuration on Juniper Junos OS

Network Topology

Display Network Topology


Base configurations

mxA
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lab@mxA> show configuration | display set 
set version 20190829.221548_builder.r1052644
set system host-name mxA
set system root-authentication encrypted-password "$1$KI99zGk6$MbYFuBbpLffu9tn2.sI7l1"
set system root-authentication ssh-dsa "ssh-dss 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 configurator@server1.he"
set system login user lab uid 2000
set system login user lab class super-user
set system login user lab authentication encrypted-password "$6$JEnFYM1n$C6pjHzEv3cK/iovqkiJywOgyrmgNnX/U0r3B3kfaeXa4ygKFE1l7De7YsKVbjdJnab3PfylSLmDHjgPVMiilP1"
set system services ssh root-login allow
set system services netconf ssh
set system syslog user * any emergency
set system syslog file messages any notice
set system syslog file messages authorization info
set system syslog file interactive-commands interactive-commands any
set interfaces ge-0/0/0 unit 0 family inet address 10.0.10.1/24
set interfaces ge-0/0/1 unit 0 family inet address 172.22.123.1/24
set interfaces ge-0/0/3 unit 0 family inet address 172.22.121.1/24
set interfaces fxp0 unit 0 family inet address 172.25.11.1/24
set interfaces lo0 unit 0 family inet address 172.16.1.1/32
set policy-options policy-statement export-aggregate term 1 from protocol aggregate
set policy-options policy-statement export-aggregate term 1 from route-filter 172.16.1.0/24 exact
set policy-options policy-statement export-aggregate term 1 then accept
set policy-options policy-statement export-aggregate term 2 from route-filter 172.16.1.0/24 longer
set policy-options policy-statement export-aggregate term 2 then reject
set policy-options policy-statement pfe-load-balance term 1 from protocol bgp
set policy-options policy-statement pfe-load-balance term 1 from route-filter 30.30.0.0/22 longer
set policy-options policy-statement pfe-load-balance term 1 then load-balance per-packet
set policy-options policy-statement redistribute-statics term 1 from protocol static
set policy-options policy-statement redistribute-statics term 1 then accept
set routing-options forwarding-table export pfe-load-balance
set routing-options autonomous-system 65001
set routing-options aggregate route 172.16.1.0/24
set protocols ospf area 0.0.0.0 interface lo0.0
set protocols ospf area 0.0.0.0 interface ge-0/0/0.0
set protocols bgp group ibgp type internal
set protocols bgp group ibgp local-address 172.16.1.1
set protocols bgp group ibgp export redistribute-statics
set protocols bgp group ibgp neighbor 172.16.1.2
set protocols bgp group P1-P2 type external
set protocols bgp group P1-P2 export redistribute-statics
set protocols bgp group P1-P2 export export-aggregate
set protocols bgp group P1-P2 peer-as 65412
set protocols bgp group P1-P2 neighbor 172.22.121.2
set protocols bgp group P1-P2 neighbor 172.22.123.2

lab@mxA>

lab@mxA> show ospf neighbor 
Address          Interface              State     ID               Pri  Dead
10.0.10.2        ge-0/0/0.0             Full      172.16.1.2       128    33

lab@mxA> 

lab@mxA> show bgp summary 
Threading mode: BGP I/O
Groups: 2 Peers: 3 Down peers: 0
Table          Tot Paths  Act Paths Suppressed    History Damp State    Pending
inet.0               
                      15          5          0          0          0          0
Peer                     AS      InPkt     OutPkt    OutQ   Flaps Last Up/Dwn State|#Active/Received/Accepted/Damped...
172.16.1.2            65001          7          6       0       0        1:33 Establ
  inet.0: 0/5/5/0
172.22.121.2          65412          9          5       0       0        1:39 Establ
  inet.0: 5/5/5/0
172.22.123.2          65412          7          5       0       0        1:35 Establ
  inet.0: 0/5/5/0

lab@mxA>


mxB
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lab@mxB> show configuration | display set 
set version 20190829.221548_builder.r1052644
set system host-name mxB
set system root-authentication encrypted-password "$1$KI99zGk6$MbYFuBbpLffu9tn2.sI7l1"
set system root-authentication ssh-dsa "ssh-dss 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 configurator@server1.he"
set system login user lab uid 2000
set system login user lab class super-user
set system login user lab authentication encrypted-password "$6$JEnFYM1n$C6pjHzEv3cK/iovqkiJywOgyrmgNnX/U0r3B3kfaeXa4ygKFE1l7De7YsKVbjdJnab3PfylSLmDHjgPVMiilP1"
set system services ssh root-login allow
set system services netconf ssh
set system syslog user * any emergency
set system syslog file messages any notice
set system syslog file messages authorization info
set system syslog file interactive-commands interactive-commands any
set logical-systems P3 interfaces ge-0/0/3 unit 0 family inet address 172.22.125.2/24
set logical-systems P3 interfaces ge-0/0/4 unit 0 family inet address 172.22.126.2/24
set logical-systems P3 interfaces lo0 unit 0 family inet address 172.31.102.1/32
set logical-systems P3 protocols bgp group R3-1 type external
set logical-systems P3 protocols bgp group R3-1 multihop
set logical-systems P3 protocols bgp group R3-1 local-address 172.31.102.1
set logical-systems P3 protocols bgp group R3-1 export ajspr-bgp-export-p3
set logical-systems P3 protocols bgp group R3-1 neighbor 172.16.1.2 peer-as 65001
set logical-systems P3 protocols bgp group R3-2 type external
set logical-systems P3 protocols bgp group R3-2 multihop
set logical-systems P3 protocols bgp group R3-2 local-address 172.31.102.1
set logical-systems P3 protocols bgp group R3-2 export ajspr-bgp-export-p3
set logical-systems P3 protocols bgp group R3-2 neighbor 172.16.2.2 peer-as 65002
set logical-systems P3 policy-options policy-statement ajspr-bgp-export-p3 term 1 from protocol static
set logical-systems P3 policy-options policy-statement ajspr-bgp-export-p3 term 1 from route-filter 40.40.0.0/22 orlonger
set logical-systems P3 policy-options policy-statement ajspr-bgp-export-p3 term 1 then accept
set logical-systems P3 policy-options policy-statement ajspr-bgp-export-p3 term 2 from protocol bgp
set logical-systems P3 policy-options policy-statement ajspr-bgp-export-p3 term 2 from route-filter 30.30.0.0/22 longer
set logical-systems P3 policy-options policy-statement ajspr-bgp-export-p3 term 2 then reject
set logical-systems P3 routing-options static route 20.20.0.0/24 reject
set logical-systems P3 routing-options static route 20.20.1.0/24 reject
set logical-systems P3 routing-options static route 20.20.2.0/24 reject
set logical-systems P3 routing-options static route 20.20.3.0/24 reject
set logical-systems P3 routing-options static route 20.20.4.0/25 reject
set logical-systems P3 routing-options static route 20.20.4.128/25 reject
set logical-systems P3 routing-options static route 20.20.5.0/26 reject
set logical-systems P3 routing-options static route 20.20.5.64/26 reject
set logical-systems P3 routing-options static route 20.20.5.128/26 reject
set logical-systems P3 routing-options static route 20.20.5.192/26 reject
set logical-systems P3 routing-options static route 40.40.0.0/24 reject
set logical-systems P3 routing-options static route 40.40.1.0/24 reject
set logical-systems P3 routing-options static route 40.40.2.0/24 reject
set logical-systems P3 routing-options static route 40.40.3.0/24 reject
set logical-systems P3 routing-options static route 172.16.1.2/32 next-hop 172.22.125.1
set logical-systems P3 routing-options static route 172.16.2.2/32 next-hop 172.22.126.1
set logical-systems P3 routing-options static route 172.16.1.4/32 next-hop 172.22.125.1
set logical-systems P3 routing-options static route 172.16.2.4/32 next-hop 172.22.126.1
set logical-systems P3 routing-options static route 10.0.20.0/22 next-hop 172.22.125.1
set logical-systems P3 routing-options static route 10.0.24.0/22 next-hop 172.22.126.1
set logical-systems P3 routing-options autonomous-system 65020
set logical-systems P3 routing-options aggregate route 20.20.0.0/21
set logical-systems R3-1 interfaces ge-0/0/0 unit 0 family inet address 10.0.10.2/24
set logical-systems R3-1 interfaces ge-0/0/2 unit 0 family inet address 172.22.125.1/24
set logical-systems R3-1 interfaces lo0 unit 1 family inet address 172.16.1.2/32
set logical-systems R3-1 protocols ospf area 0.0.0.0 interface lo0.1
set logical-systems R3-1 protocols ospf area 0.0.0.0 interface ge-0/0/0.0
set logical-systems R3-1 protocols bgp group ibgp type internal
set logical-systems R3-1 protocols bgp group ibgp local-address 172.16.1.2
set logical-systems R3-1 protocols bgp group ibgp export redistribute-statics
set logical-systems R3-1 protocols bgp group ibgp neighbor 172.16.1.1
set logical-systems R3-1 protocols bgp group P3 type external
set logical-systems R3-1 protocols bgp group P3 multihop
set logical-systems R3-1 protocols bgp group P3 local-address 172.16.1.2
set logical-systems R3-1 protocols bgp group P3 export export-aggregate
set logical-systems R3-1 protocols bgp group P3 peer-as 65020
set logical-systems R3-1 protocols bgp group P3 neighbor 172.31.102.1
set logical-systems R3-1 policy-options policy-statement export-aggregate term 1 from protocol aggregate
set logical-systems R3-1 policy-options policy-statement export-aggregate term 1 from route-filter 172.16.1.0/24 exact
set logical-systems R3-1 policy-options policy-statement export-aggregate term 1 then accept
set logical-systems R3-1 policy-options policy-statement export-aggregate term 2 from route-filter 172.16.1.0/24 longer
set logical-systems R3-1 policy-options policy-statement export-aggregate term 2 then reject
set logical-systems R3-1 policy-options policy-statement redistribute-statics term 1 from protocol static
set logical-systems R3-1 policy-options policy-statement redistribute-statics term 1 then accept
set logical-systems R3-1 routing-options static route 172.31.102.1/32 next-hop 172.22.125.2
set logical-systems R3-1 routing-options static route 172.31.102.1/32 no-readvertise
set logical-systems R3-1 routing-options autonomous-system 65001
set logical-systems R3-1 routing-options aggregate route 172.16.1.0/24
set logical-systems R3-2 interfaces ge-0/0/1 unit 0 family inet address 10.0.14.2/24
set logical-systems R3-2 interfaces ge-0/0/5 unit 0 family inet address 172.22.126.1/24
set logical-systems R3-2 interfaces lo0 unit 2 family inet address 172.16.2.2/32
set logical-systems R3-2 protocols ospf area 0.0.0.0 interface lo0.2
set logical-systems R3-2 protocols ospf area 0.0.0.0 interface ge-0/0/1.0
set logical-systems R3-2 protocols bgp group ibgp type internal
set logical-systems R3-2 protocols bgp group ibgp local-address 172.16.2.2
set logical-systems R3-2 protocols bgp group ibgp export redistribute-statics
set logical-systems R3-2 protocols bgp group ibgp export next-hop-self
set logical-systems R3-2 protocols bgp group ibgp neighbor 172.16.2.1
set logical-systems R3-2 protocols bgp group P3 type external
set logical-systems R3-2 protocols bgp group P3 multihop
set logical-systems R3-2 protocols bgp group P3 local-address 172.16.2.2
set logical-systems R3-2 protocols bgp group P3 export export-aggregate
set logical-systems R3-2 protocols bgp group P3 neighbor 172.31.102.1 peer-as 65020
set logical-systems R3-2 policy-options policy-statement export-aggregate term 1 from protocol aggregate
set logical-systems R3-2 policy-options policy-statement export-aggregate term 1 from route-filter 172.16.2.0/24 exact
set logical-systems R3-2 policy-options policy-statement export-aggregate term 1 then accept
set logical-systems R3-2 policy-options policy-statement export-aggregate term 2 from route-filter 172.16.2.0/24 longer
set logical-systems R3-2 policy-options policy-statement export-aggregate term 2 then reject
set logical-systems R3-2 policy-options policy-statement next-hop-self term 1 from protocol bgp
set logical-systems R3-2 policy-options policy-statement next-hop-self term 1 from route-type external
set logical-systems R3-2 policy-options policy-statement next-hop-self term 1 then next-hop self
set logical-systems R3-2 policy-options policy-statement redistribute-statics term 1 from protocol static
set logical-systems R3-2 policy-options policy-statement redistribute-statics term 1 then accept
set logical-systems R3-2 routing-options static route 172.16.2.128/26 reject
set logical-systems R3-2 routing-options static route 172.16.2.192/26 reject
set logical-systems R3-2 routing-options static route 172.31.102.1/32 next-hop 172.22.126.2
set logical-systems R3-2 routing-options static route 172.31.102.1/32 no-readvertise
set logical-systems R3-2 routing-options autonomous-system 65002
set logical-systems R3-2 routing-options aggregate route 172.16.2.0/24
set interfaces fxp0 unit 0 family inet address 172.25.11.2/24
                                        
lab@mxB>

lab@mxB> show bgp summary logical-system P3 
Threading mode: BGP I/O
Groups: 2 Peers: 2 Down peers: 0
Table          Tot Paths  Act Paths Suppressed    History Damp State    Pending
inet.0               
                       2          2          0          0          0          0
Peer                     AS      InPkt     OutPkt    OutQ   Flaps Last Up/Dwn State|#Active/Received/Accepted/Damped...
172.16.1.2            65001          3          4       0       0          26 Establ
  inet.0: 1/1/1/0
172.16.2.2            65002          3          4       0       0          24 Establ
  inet.0: 1/1/1/0

lab@mxB>


mxC
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lab@mxC> show configuration | display set 
set version 20190829.221548_builder.r1052644
set system host-name mxC
set system root-authentication encrypted-password "$1$KI99zGk6$MbYFuBbpLffu9tn2.sI7l1"
set system root-authentication ssh-dsa "ssh-dss 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 configurator@server1.he"
set system login user lab uid 2000
set system login user lab class super-user
set system login user lab authentication encrypted-password "$6$JEnFYM1n$C6pjHzEv3cK/iovqkiJywOgyrmgNnX/U0r3B3kfaeXa4ygKFE1l7De7YsKVbjdJnab3PfylSLmDHjgPVMiilP1"
set system services ssh root-login allow
set system services netconf ssh
set system syslog user * any emergency
set system syslog file messages any notice
set system syslog file messages authorization info
set system syslog file interactive-commands interactive-commands any
set interfaces ge-0/0/0 unit 0 family inet address 10.0.14.1/24
set interfaces ge-0/0/1 unit 0 family inet address 172.22.124.1/24
set interfaces ge-0/0/3 unit 0 family inet address 172.22.122.1/24
set interfaces fxp0 unit 0 family inet address 172.25.11.3/24
set interfaces lo0 unit 0 family inet address 172.16.2.1/32
set policy-options policy-statement export-aggregate term 1 from protocol aggregate
set policy-options policy-statement export-aggregate term 1 from route-filter 172.16.2.0/24 exact
set policy-options policy-statement export-aggregate term 1 then accept
set policy-options policy-statement export-aggregate term 2 from route-filter 172.16.2.0/24 longer
set policy-options policy-statement export-aggregate term 2 then reject
set policy-options policy-statement import-P1 term 1 from protocol bgp
set policy-options policy-statement import-P1 term 1 from as-path partner-as
set policy-options policy-statement import-P1 term 1 then accept
set policy-options policy-statement import-P1 term 2 then reject
set policy-options policy-statement next-hop-self term 1 from protocol bgp
set policy-options policy-statement next-hop-self term 1 from route-type external
set policy-options policy-statement next-hop-self term 1 then next-hop self
set policy-options policy-statement pfe-load-balance term 1 from protocol bgp
set policy-options policy-statement pfe-load-balance term 1 from route-filter 30.30.0.0/22 longer
set policy-options policy-statement pfe-load-balance term 1 then load-balance per-packet
set policy-options policy-statement redistribute-statics term 1 from protocol static
set policy-options policy-statement redistribute-statics term 1 then accept
set policy-options as-path partner-as ".* 65001"
set policy-options as-path internal-as "()"
set routing-options static route 172.16.2.0/26 reject
set routing-options static route 172.16.2.64/26 reject
set routing-options forwarding-table export pfe-load-balance
set routing-options autonomous-system 65002
set routing-options aggregate route 172.16.2.0/24
set protocols ospf area 0.0.0.0 interface lo0.0
set protocols ospf area 0.0.0.0 interface ge-0/0/0.0
set protocols bgp group ibgp type internal
set protocols bgp group ibgp local-address 172.16.2.1
set protocols bgp group ibgp export redistribute-statics
set protocols bgp group ibgp export next-hop-self
set protocols bgp group ibgp neighbor 172.16.2.2
set protocols bgp group P1-P2 type external
set protocols bgp group P1-P2 export export-aggregate
set protocols bgp group P1-P2 peer-as 65412
set protocols bgp group P1-P2 neighbor 172.22.122.2 import import-P1
set protocols bgp group P1-P2 neighbor 172.22.124.2

lab@mxC>

lab@mxC> show ospf neighbor 
Address          Interface              State     ID               Pri  Dead
10.0.14.2        ge-0/0/0.0             Full      172.16.2.2       128    33

lab@mxC> 

lab@mxC> show bgp summary 
Threading mode: BGP I/O
Groups: 2 Peers: 3 Down peers: 2
Table          Tot Paths  Act Paths Suppressed    History Damp State    Pending
inet.0               
                       7          7          0          0          0          0
Peer                     AS      InPkt     OutPkt    OutQ   Flaps Last Up/Dwn State|#Active/Received/Accepted/Damped...
172.16.2.2            65002         51         49       0       0       21:06 Establ
  inet.0: 7/7/7/0
172.22.122.2          65412          0          0       0       0       21:18 Connect
172.22.124.2          65412          0          0       0       0       21:18 Connect

lab@mxC>


mxD
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lab@mxD> show configuration | display set 
set version 20190829.221548_builder.r1052644
set system host-name mxD
set system root-authentication encrypted-password "$1$KI99zGk6$MbYFuBbpLffu9tn2.sI7l1"
set system root-authentication ssh-dsa "ssh-dss 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 configurator@server1.he"
set system login user lab uid 2000
set system login user lab class super-user
set system login user lab authentication encrypted-password "$6$JEnFYM1n$C6pjHzEv3cK/iovqkiJywOgyrmgNnX/U0r3B3kfaeXa4ygKFE1l7De7YsKVbjdJnab3PfylSLmDHjgPVMiilP1"
set system services ssh root-login allow
set system services netconf ssh
set system syslog user * any emergency
set system syslog file messages any notice
set system syslog file messages authorization info
set system syslog file interactive-commands interactive-commands any
set logical-systems P1 interfaces ge-0/0/0 unit 0 family inet address 172.22.252.1/30
set logical-systems P1 interfaces ge-0/0/1 unit 0 family inet address 172.22.121.2/24
set logical-systems P1 interfaces ge-0/0/4 unit 0 family inet address 172.22.122.2/24
set logical-systems P1 interfaces lo0 unit 0 family inet address 172.31.100.1/32
set logical-systems P1 protocols ospf area 0.0.0.0 interface lo0.0
set logical-systems P1 protocols ospf area 0.0.0.0 interface ge-0/0/0.0
set logical-systems P1 protocols bgp group ibgp type internal
set logical-systems P1 protocols bgp group ibgp local-address 172.31.100.1
set logical-systems P1 protocols bgp group ibgp export ajspr-bgp-nhs
set logical-systems P1 protocols bgp group ibgp neighbor 172.31.101.1
set logical-systems P1 protocols bgp group mxA type external
set logical-systems P1 protocols bgp group mxA export ajspr-bgp-export
set logical-systems P1 protocols bgp group mxA neighbor 172.22.121.1 peer-as 65001
set logical-systems P1 protocols bgp group mxC type external
set logical-systems P1 protocols bgp group mxC export ajspr-bgp-export
set logical-systems P1 protocols bgp group mxC neighbor 172.22.122.1 peer-as 65002
set logical-systems P1 policy-options policy-statement ajspr-bgp-export term 1 from protocol static
set logical-systems P1 policy-options policy-statement ajspr-bgp-export term 1 from route-filter 30.30.0.0/22 orlonger
set logical-systems P1 policy-options policy-statement ajspr-bgp-export term 1 then accept
set logical-systems P1 policy-options policy-statement ajspr-bgp-export term 2 from protocol bgp
set logical-systems P1 policy-options policy-statement ajspr-bgp-export term 2 from route-filter 40.40.0.0/22 longer
set logical-systems P1 policy-options policy-statement ajspr-bgp-export term 2 then reject
set logical-systems P1 policy-options policy-statement ajspr-bgp-nhs term 1 from protocol bgp
set logical-systems P1 policy-options policy-statement ajspr-bgp-nhs term 1 from route-type external
set logical-systems P1 policy-options policy-statement ajspr-bgp-nhs term 1 then next-hop self
set logical-systems P1 routing-options static route 30.30.0.0/24 reject
set logical-systems P1 routing-options static route 30.30.1.0/24 reject
set logical-systems P1 routing-options static route 30.30.2.0/24 reject
set logical-systems P1 routing-options static route 30.30.3.0/24 reject
set logical-systems P1 routing-options autonomous-system 65412
set interfaces fxp0 unit 0 family inet address 172.25.11.4/24

lab@mxD> 

lab@mxD> show ospf neighbor logical-system P1 
Address          Interface              State     ID               Pri  Dead
172.22.252.2     ge-0/0/0.0             Full      172.31.101.1     128    36

lab@mxD> 

lab@mxD> show bgp summary logical-system P1 
Threading mode: BGP I/O
Groups: 3 Peers: 3 Down peers: 1
Table          Tot Paths  Act Paths Suppressed    History Damp State    Pending
inet.0               
                      12          6          0          0          0          0
Peer                     AS      InPkt     OutPkt    OutQ   Flaps Last Up/Dwn State|#Active/Received/Accepted/Damped...
172.22.121.1          65001          0          0       0       0        2:27 Connect
172.22.122.1          65002         10          7       0       0        2:15 Establ
  inet.0: 6/6/6/0
172.31.101.1          65412          9          8       0       0        2:05 Establ
  inet.0: 0/6/6/0

lab@mxD>


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lab@mxE> show configuration | display set 
set version 20190829.221548_builder.r1052644
set system host-name mxE
set system root-authentication encrypted-password "$1$KI99zGk6$MbYFuBbpLffu9tn2.sI7l1"
set system root-authentication ssh-dsa "ssh-dss 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 configurator@server1.he"
set system login user lab uid 2000
set system login user lab class super-user
set system login user lab authentication encrypted-password "$6$JEnFYM1n$C6pjHzEv3cK/iovqkiJywOgyrmgNnX/U0r3B3kfaeXa4ygKFE1l7De7YsKVbjdJnab3PfylSLmDHjgPVMiilP1"
set system services ssh root-login allow
set system services netconf ssh
set system syslog user * any emergency
set system syslog file messages any notice
set system syslog file messages authorization info
set system syslog file interactive-commands interactive-commands any
set logical-systems P2 interfaces ge-0/0/2 unit 0 family inet address 172.22.124.2/24
set logical-systems P2 interfaces ge-0/0/5 unit 0 family inet address 172.22.252.2/30
set logical-systems P2 interfaces ge-0/0/7 unit 0 family inet address 172.22.123.2/24
set logical-systems P2 interfaces lo0 unit 0 family inet address 172.31.101.1/32
set logical-systems P2 protocols ospf area 0.0.0.0 interface lo0.0
set logical-systems P2 protocols ospf area 0.0.0.0 interface ge-0/0/5.0
set logical-systems P2 protocols bgp group ibgp type internal
set logical-systems P2 protocols bgp group ibgp local-address 172.31.101.1
set logical-systems P2 protocols bgp group ibgp export ajspr-bgp-nhs
set logical-systems P2 protocols bgp group ibgp neighbor 172.31.100.1
set logical-systems P2 protocols bgp group mxA type external
set logical-systems P2 protocols bgp group mxA export ajspr-bgp-export
set logical-systems P2 protocols bgp group mxA neighbor 172.22.123.1 peer-as 65001
set logical-systems P2 protocols bgp group mxC type external
set logical-systems P2 protocols bgp group mxC export ajspr-bgp-export
set logical-systems P2 protocols bgp group mxC neighbor 172.22.124.1 peer-as 65002
set logical-systems P2 policy-options policy-statement ajspr-bgp-export term 1 from protocol static
set logical-systems P2 policy-options policy-statement ajspr-bgp-export term 1 from route-filter 30.30.0.0/22 orlonger
set logical-systems P2 policy-options policy-statement ajspr-bgp-export term 1 then accept
set logical-systems P2 policy-options policy-statement ajspr-bgp-export term 2 from protocol bgp
set logical-systems P2 policy-options policy-statement ajspr-bgp-export term 2 from route-filter 40.40.0.0/22 longer
set logical-systems P2 policy-options policy-statement ajspr-bgp-export term 2 then reject
set logical-systems P2 policy-options policy-statement ajspr-bgp-nhs term 1 from protocol bgp
set logical-systems P2 policy-options policy-statement ajspr-bgp-nhs term 1 from route-type external
set logical-systems P2 policy-options policy-statement ajspr-bgp-nhs term 1 then next-hop self
set logical-systems P2 routing-options static route 30.30.0.0/24 reject
set logical-systems P2 routing-options static route 30.30.1.0/24 reject
set logical-systems P2 routing-options static route 30.30.2.0/24 reject
set logical-systems P2 routing-options static route 30.30.3.0/24 reject
set logical-systems P2 routing-options autonomous-system 65412
set interfaces fxp0 unit 0 family inet address 172.25.11.5/24

lab@mxE>

lab@mxE> show bgp summary logical-system P2 
Threading mode: BGP I/O
Groups: 3 Peers: 3 Down peers: 2
Table          Tot Paths  Act Paths Suppressed    History Damp State    Pending
inet.0               
                       6          6          0          0          0          0
Peer                     AS      InPkt     OutPkt    OutQ   Flaps Last Up/Dwn State|#Active/Received/Accepted/Damped...
172.22.123.1          65001          0          0       0       0        1:14 Connect
172.22.124.1          65002          7          4       0       0        1:04 Establ
  inet.0: 6/6/6/0
172.31.100.1          65412          0          0       0       0        1:14 Active

lab@mxE>


Repairing Unusable Routes

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lab@mxA> show route table inet.0 

inet.0: 21 destinations, 27 routes (17 active, 0 holddown, 5 hidden)
+ = Active Route, - = Last Active, * = Both

10.0.10.0/24       *[Direct/0] 00:11:05
                    >  via ge-0/0/0.0
10.0.10.1/32       *[Local/0] 00:11:05
                       Local via ge-0/0/0.0
30.30.0.0/24       *[BGP/170] 00:10:59, localpref 100
                      AS path: 65412 I, validation-state: unverified
                    >  to 172.22.121.2 via ge-0/0/3.0
                    [BGP/170] 00:10:55, localpref 100
                      AS path: 65412 I, validation-state: unverified
                    >  to 172.22.123.2 via ge-0/0/1.0
30.30.1.0/24       *[BGP/170] 00:10:59, localpref 100
                      AS path: 65412 I, validation-state: unverified
                    >  to 172.22.121.2 via ge-0/0/3.0
                    [BGP/170] 00:10:55, localpref 100
                      AS path: 65412 I, validation-state: unverified
                    >  to 172.22.123.2 via ge-0/0/1.0
30.30.2.0/24       *[BGP/170] 00:10:59, localpref 100
                      AS path: 65412 I, validation-state: unverified
                    >  to 172.22.121.2 via ge-0/0/3.0
                    [BGP/170] 00:10:55, localpref 100
                      AS path: 65412 I, validation-state: unverified
                    >  to 172.22.123.2 via ge-0/0/1.0
30.30.3.0/24       *[BGP/170] 00:10:59, localpref 100
                      AS path: 65412 I, validation-state: unverified
                    >  to 172.22.121.2 via ge-0/0/3.0
                    [BGP/170] 00:10:55, localpref 100
                      AS path: 65412 I, validation-state: unverified
                    >  to 172.22.123.2 via ge-0/0/1.0
172.16.1.0/24      *[Aggregate/130] 00:11:05
                       Reject
172.16.1.1/32      *[Direct/0] 04:22:15
                    >  via lo0.0
172.16.1.2/32      *[OSPF/10] 00:10:55, metric 1
                    >  to 10.0.10.2 via ge-0/0/0.0
172.16.2.0/24      *[BGP/170] 00:10:59, localpref 100
                      AS path: 65412 65002 I, validation-state: unverified
                    >  to 172.22.121.2 via ge-0/0/3.0
                    [BGP/170] 00:10:55, localpref 100
                      AS path: 65412 65002 I, validation-state: unverified
                    >  to 172.22.123.2 via ge-0/0/1.0
172.22.121.0/24    *[Direct/0] 00:11:05
                    >  via ge-0/0/3.0
172.22.121.1/32    *[Local/0] 00:11:05
                       Local via ge-0/0/3.0
172.22.123.0/24    *[Direct/0] 00:11:05
                    >  via ge-0/0/1.0
172.22.123.1/32    *[Local/0] 00:11:05
                       Local via ge-0/0/1.0
172.25.11.0/24     *[Direct/0] 04:22:15
                    >  via fxp0.0
172.25.11.1/32     *[Local/0] 04:22:15
                       Local via fxp0.0
224.0.0.5/32       *[OSPF/10] 00:11:05, metric 1
                       MultiRecv

lab@mxA> 

lab@mxA> show route hidden table inet.0 

inet.0: 21 destinations, 27 routes (17 active, 0 holddown, 5 hidden)
+ = Active Route, - = Last Active, * = Both

40.40.0.0/24        [BGP/170] 00:12:45, localpref 100, from 172.16.1.2
                      AS path: 65020 I, validation-state: unverified
                       Unusable
40.40.1.0/24        [BGP/170] 00:12:45, localpref 100, from 172.16.1.2
                      AS path: 65020 I, validation-state: unverified
                       Unusable
40.40.2.0/24        [BGP/170] 00:12:45, localpref 100, from 172.16.1.2
                      AS path: 65020 I, validation-state: unverified
                       Unusable
40.40.3.0/24        [BGP/170] 00:12:45, localpref 100, from 172.16.1.2
                      AS path: 65020 I, validation-state: unverified
                       Unusable
172.16.2.0/24       [BGP/170] 00:12:45, localpref 100, from 172.16.1.2
                      AS path: 65020 65002 I, validation-state: unverified
                       Unusable

lab@mxA> 


lab@mxA> show route 40.40.0.0/24 hidden extensive 

inet.0: 21 destinations, 27 routes (17 active, 0 holddown, 5 hidden)
40.40.0.0/24 (1 entry, 0 announced)
         BGP    Preference: 170/-101
                Next hop type: Unusable, Next hop index: 0
                Address: 0xc0f12d0
                Next-hop reference count: 5
                State: <Hidden Int Ext Changed>
                Local AS: 65001 Peer AS: 65001
                Age: 13:14 
                Validation State: unverified 
                Task: BGP_65001.172.16.1.2
                AS path: 65020 I 
                Accepted
                Localpref: 100
                Router ID: 172.16.1.2
                Indirect next hops: 1
                        Protocol next hop: 172.31.102.1
                        Indirect next hop: 0x0 - INH Session ID: 0x0

lab@mxA> 

lab@mxA> show route 172.31.102.1 table inet.0 

lab@mxA>


mxB:R3-1
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lab@mxB> set cli logical-system R3-1 
Logical system: R3-1

lab@mxB:R3-1> configure 
Entering configuration mode

[edit]
lab@mxB:R3-1# edit policy-options policy-statement next-hop-self 

[edit policy-options policy-statement next-hop-self]
lab@mxB:R3-1# set term 1 from protocol bgp 

[edit policy-options policy-statement next-hop-self]
lab@mxB:R3-1# set term 1 from route-type external 

[edit policy-options policy-statement next-hop-self]
lab@mxB:R3-1# set term 1 then next-hop self 

[edit policy-options policy-statement next-hop-self]
lab@mxB:R3-1# top 

[edit]
lab@mxB:R3-1# show | compare 
[edit logical-systems R3-1 policy-options]
+   policy-statement next-hop-self {
+       term 1 {
+           from {
+               protocol bgp;
+               route-type external;
+           }
+           then {
+               next-hop self;
+           }
+       }
+   }

[edit]
lab@mxB:R3-1# 

[edit]
lab@mxB:R3-1# top edit protocols bgp 

[edit protocols bgp]
lab@mxB:R3-1# set group ibgp export next-hop-self 

[edit protocols bgp]
lab@mxB:R3-1# top 

[edit]
lab@mxB:R3-1# show | compare 
[edit logical-systems R3-1 protocols bgp group ibgp]
-    export redistribute-statics;
+    export [ redistribute-statics next-hop-self ];
[edit logical-systems R3-1 policy-options]
+   policy-statement next-hop-self {
+       term 1 {
+           from {
+               protocol bgp;
+               route-type external;
+           }
+           then {
+               next-hop self;
+           }
+       }
+   }

[edit]
lab@mxB:R3-1# 

[edit]
lab@mxB:R3-1# commit and-quit 
commit complete
Exiting configuration mode

lab@mxB:R3-1>


mxA
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lab@mxA> show route hidden 

inet.0: 21 destinations, 27 routes (21 active, 0 holddown, 0 hidden)

inet6.0: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)

lab@mxA>


mxB:R3-1
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lab@mxB:R3-1> show route hidden 

inet.0: 18 destinations, 19 routes (14 active, 0 holddown, 5 hidden)
+ = Active Route, - = Last Active, * = Both

30.30.0.0/24        [BGP/170] 00:35:18, localpref 100, from 172.16.1.1
                      AS path: 65412 I, validation-state: unverified
                       Unusable
30.30.1.0/24        [BGP/170] 00:35:18, localpref 100, from 172.16.1.1
                      AS path: 65412 I, validation-state: unverified
                       Unusable
30.30.2.0/24        [BGP/170] 00:35:18, localpref 100, from 172.16.1.1
                      AS path: 65412 I, validation-state: unverified
                       Unusable
30.30.3.0/24        [BGP/170] 00:35:18, localpref 100, from 172.16.1.1
                      AS path: 65412 I, validation-state: unverified
                       Unusable
172.16.2.0/24       [BGP/170] 00:35:18, localpref 100, from 172.16.1.1
                      AS path: 65412 65002 I, validation-state: unverified
                       Unusable

inet6.0: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)

lab@mxB:R3-1>


lab@mxB:R3-1> show route 30.30.0.0/24 hidden extensive 

inet.0: 18 destinations, 19 routes (14 active, 0 holddown, 5 hidden)
30.30.0.0/24 (1 entry, 0 announced)
         BGP    Preference: 170/-101
                Next hop type: Unusable, Next hop index: 0
                Address: 0xc0d82d0
                Next-hop reference count: 5
                State: <Hidden Int Ext Changed>
                Local AS: 65001 Peer AS: 65001
                Age: 36:21 
                Validation State: unverified 
                Task: BGP_65001.172.16.1.1
                AS path: 65412 I 
                Accepted
                Localpref: 100
                Router ID: 172.16.1.1
                Indirect next hops: 1
                        Protocol next hop: 172.22.121.2
                        Indirect next hop: 0x0 - INH Session ID: 0x0

lab@mxB:R3-1> 

lab@mxB:R3-1> show route 172.22.121.2 table inet.0 

lab@mxB:R3-1>


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lab@mxA> configure 
Entering configuration mode

[edit]
lab@mxA# edit policy-options policy-statement next-hop-self 

[edit policy-options policy-statement next-hop-self]
lab@mxA# set term 1 from protocol bgp 

[edit policy-options policy-statement next-hop-self]
lab@mxA# set term 1 from route-type external 

[edit policy-options policy-statement next-hop-self]
lab@mxA# set term 1 then next-hop self 

[edit policy-options policy-statement next-hop-self]
lab@mxA# top 

[edit]
lab@mxA# show | compare 
[edit policy-options]
+   policy-statement next-hop-self {
+       term 1 {
+           from {
+               protocol bgp;
+               route-type external;
+           }
+           then {
+               next-hop self;
+           }
+       }
+   }

[edit]
lab@mxA# 

[edit]
lab@mxA# top edit protocols bgp 

[edit protocols bgp]
lab@mxA# set group ibgp export next-hop-self 

[edit protocols bgp]
lab@mxA# commit and-quit 
commit complete
Exiting configuration mode

lab@mxA>


mxB:R3-1
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lab@mxB:R3-1> show route hidden 

inet.0: 18 destinations, 19 routes (18 active, 0 holddown, 0 hidden)

inet6.0: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)

lab@mxB:R3-1>


Modifying the Local-Preference Attribute

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lab@mxA> show route 172.16.2.0/24 detail 

inet.0: 21 destinations, 27 routes (21 active, 0 holddown, 0 hidden)
172.16.2.0/24 (3 entries, 1 announced)
        *BGP    Preference: 170/-101
                Next hop type: Router, Next hop index: 578
                Address: 0xc0f1bcc
                Next-hop reference count: 10
                Source: 172.22.121.2
                Next hop: 172.22.121.2 via ge-0/0/3.0, selected
                Session Id: 0x140
                State: <Active Ext>
                Local AS: 65001 Peer AS: 65412
                Age: 41:25 
                Validation State: unverified 
                Task: BGP_65412.172.22.121.2
                Announcement bits (3): 0-KRT 1-BGP_RT_Background 5-Resolve tree 1 
                AS path: 65412 65002 I 
                Aggregator: 65002 172.16.2.1
                Accepted
                Localpref: 100
                Router ID: 172.31.100.1
         BGP    Preference: 170/-101
                Next hop type: Router, Next hop index: 0
                Address: 0xc0f1d5c
                Next-hop reference count: 5
                Source: 172.22.123.2
                Next hop: 172.22.123.2 via ge-0/0/1.0, selected
                Session Id: 0x0
                State: <NotBest Ext Changed>
                Inactive reason: Not Best in its group - Active preferred
                Local AS: 65001 Peer AS: 65412
                Age: 41:21 
                Validation State: unverified 
                Task: BGP_65412.172.22.123.2
                AS path: 65412 65002 I 
                Aggregator: 65002 172.16.2.1
                Accepted
                Localpref: 100
                Router ID: 172.31.101.1
         BGP    Preference: 170/-101    
                Next hop type: Indirect, Next hop index: 0
                Address: 0xc0f1f50
                Next-hop reference count: 9
                Source: 172.16.1.2
                Next hop type: Router, Next hop index: 601
                Next hop: 10.0.10.2 via ge-0/0/0.0, selected
                Session Id: 0x141
                Protocol next hop: 172.16.1.2
                Indirect next hop: 0xc298a84 1048574 INH Session ID: 0x142
                State: <Int Ext Changed>
                Inactive reason: Interior > Exterior > Exterior via Interior
                Local AS: 65001 Peer AS: 65001
                Age: 7:10 	Metric2: 1 
                Validation State: unverified 
                Task: BGP_65001.172.16.1.2
                AS path: 65020 65002 I 
                Aggregator: 65002 172.16.2.2
                Accepted
                Localpref: 100
                Router ID: 172.16.1.2

lab@mxA> 

lab@mxA> configure 
Entering configuration mode

[edit]
lab@mxA# edit policy-options policy-statement import-localpref 

[edit policy-options policy-statement import-localpref]
lab@mxA# set term 1 from protocol bgp 

[edit policy-options policy-statement import-localpref]
lab@mxA# set term 1 from neighbor 172.22.121.2 

[edit policy-options policy-statement import-localpref]
lab@mxA# set term 1 from route-filter 172.16.2.0/24 exact 

[edit policy-options policy-statement import-localpref]
lab@mxA# set term 1 then local-preference 110 

[edit policy-options policy-statement import-localpref]
lab@mxA# show 
term 1 {
    from {
        protocol bgp;
        neighbor 172.22.121.2;
        route-filter 172.16.2.0/24 exact;
    }
    then {
        local-preference 110;
    }
}

[edit policy-options policy-statement import-localpref]
lab@mxA# 

[edit policy-options policy-statement import-localpref]
lab@mxA# top 

[edit]
lab@mxA# 

[edit]
lab@mxA# 

[edit]
lab@mxA# top edit protocols bgp group P1-P2 

[edit protocols bgp group P1-P2]
lab@mxA# set import import-local-pref 

[edit protocols bgp group P1-P2]
lab@mxA# top 

[edit]
lab@mxA# show | compare 
[edit policy-options]
+   policy-statement import-localpref {
+       term 1 {
+           from {
+               protocol bgp;
+               neighbor 172.22.121.2;
+               route-filter 172.16.2.0/24 exact;
+           }
+           then {
+               local-preference 110;
+           }
+       }
+   }
[edit protocols bgp group P1-P2]
+    import import-localpref;

[edit]
lab@mxA# 

[edit]
lab@mxA# commit and-quit 
commit complete
Exiting configuration mode

lab@mxA> 


lab@mxA> show route 172.16.2.0/24 detail 

inet.0: 21 destinations, 26 routes (21 active, 0 holddown, 0 hidden)
172.16.2.0/24 (2 entries, 1 announced)
        *BGP    Preference: 170/-111
                Next hop type: Router, Next hop index: 578
                Address: 0xc0f1bcc
                Next-hop reference count: 10
                Source: 172.22.121.2
                Next hop: 172.22.121.2 via ge-0/0/3.0, selected
                Session Id: 0x140
                State: <Active Ext>
                Local AS: 65001 Peer AS: 65412
                Age: 1:01 
                Validation State: unverified 
                Task: BGP_65412.172.22.121.2
                Announcement bits (3): 0-KRT 1-BGP_RT_Background 5-Resolve tree 1 
                AS path: 65412 65002 I 
                Aggregator: 65002 172.16.2.1
                Accepted
                Localpref: 110
                Router ID: 172.31.100.1
         BGP    Preference: 170/-101
                Next hop type: Router, Next hop index: 0
                Address: 0xc0f1d5c
                Next-hop reference count: 5
                Source: 172.22.123.2
                Next hop: 172.22.123.2 via ge-0/0/1.0, selected
                Session Id: 0x0
                State: <Ext>
                Inactive reason: Local Preference
                Local AS: 65001 Peer AS: 65412
                Age: 48:56 
                Validation State: unverified 
                Task: BGP_65412.172.22.123.2
                AS path: 65412 65002 I 
                Aggregator: 65002 172.16.2.1
                Accepted
                Localpref: 100
                Router ID: 172.31.101.1
                                        
lab@mxA>


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lab@mxB:R3-1> show route 172.16.2.0/24 detail 

inet.0: 18 destinations, 19 routes (18 active, 0 holddown, 0 hidden)
172.16.2.0/24 (2 entries, 1 announced)
        *BGP    Preference: 170/-111
                Next hop type: Indirect, Next hop index: 0
                Address: 0xc0d8c30
                Next-hop reference count: 10
                Source: 172.16.1.1
                Next hop type: Router, Next hop index: 768
                Next hop: 10.0.10.1 via ge-0/0/0.0, selected
                Session Id: 0x14a
                Protocol next hop: 172.16.1.1
                Indirect next hop: 0xc2df804 1048579 INH Session ID: 0x14b
                State: <Active Int Ext>
                Local AS: 65001 Peer AS: 65001
                Age: 3:14 	Metric2: 1 
                Validation State: unverified 
                Task: BGP_65001.172.16.1.1
                Announcement bits (3): 3-KRT 5-BGP_RT_Background 6-Resolve tree 1 
                AS path: 65412 65002 I 
                Aggregator: 65002 172.16.2.1
                Accepted
                Localpref: 110
                Router ID: 172.16.1.1
         BGP    Preference: 170/-101
                Next hop type: Indirect, Next hop index: 0
                Address: 0xc0d89d8
                Next-hop reference count: 9
                Source: 172.31.102.1
                Next hop type: Router, Next hop index: 745
                Next hop: 172.22.125.2 via ge-0/0/2.0, selected
                Session Id: 0x142
                Protocol next hop: 172.31.102.1
                Indirect next hop: 0xc2dfb04 1048575 INH Session ID: 0x145
                State: <Ext>
                Inactive reason: Local Preference
                Local AS: 65001 Peer AS: 65020
                Age: 1:23:36 	Metric2: 0 
                Validation State: unverified 
                Task: BGP_65020.172.31.102.1
                AS path: 65020 65002 I 
                Aggregator: 65002 172.16.2.2
                Accepted
                Localpref: 100
                Router ID: 172.31.102.1

lab@mxB:R3-1> 

lab@mxB:R3-1> configure 
Entering configuration mode

[edit]
lab@mxB:R3-1# edit policy-options policy-statement import-p3 

[edit policy-options policy-statement import-p3]
lab@mxB:R3-1# set term 1 from protocol bgp 

[edit policy-options policy-statement import-p3]
lab@mxB:R3-1# set term 1 from neighbor 172.31.102.1 

[edit policy-options policy-statement import-p3]
lab@mxB:R3-1# set term 1 from route-filter 172.16.2.0/24 exact 

[edit policy-options policy-statement import-p3]
lab@mxB:R3-1# set term 1 then local-preference 120 

[edit policy-options policy-statement import-p3]
lab@mxB:R3-1# show 
term 1 {
    from {
        protocol bgp;
        neighbor 172.31.102.1;
        route-filter 172.16.2.0/24 exact;
    }
    then {
        local-preference 120;
    }
}

[edit policy-options policy-statement import-p3]
lab@mxB:R3-1# top 

[edit]
lab@mxB:R3-1# edit protocols bgp group P3 

[edit protocols bgp group P3]
lab@mxB:R3-1# set import import-p3 

[edit protocols bgp group P3]
lab@mxB:R3-1# top 

[edit]
lab@mxB:R3-1# show | compare 
[edit logical-systems R3-1 protocols bgp group P3]
+    import import-p3;
[edit logical-systems R3-1 policy-options]
+   policy-statement import-p3 {
+       term 1 {
+           from {
+               protocol bgp;
+               neighbor 172.31.102.1;
+               route-filter 172.16.2.0/24 exact;
+           }
+           then {
+               local-preference 120;
+           }
+       }
+   }

[edit]
lab@mxB:R3-1# commit and-quit 
commit complete
Exiting configuration mode

lab@mxB:R3-1> 

lab@mxB:R3-1> show route 172.16.2.0/24 detail 

inet.0: 18 destinations, 18 routes (18 active, 0 holddown, 0 hidden)
172.16.2.0/24 (1 entry, 1 announced)
        *BGP    Preference: 170/-121
                Next hop type: Indirect, Next hop index: 0
                Address: 0xc0d89d8
                Next-hop reference count: 10
                Source: 172.31.102.1
                Next hop type: Router, Next hop index: 745
                Next hop: 172.22.125.2 via ge-0/0/2.0, selected
                Session Id: 0x142
                Protocol next hop: 172.31.102.1
                Indirect next hop: 0xc2dfb04 1048575 INH Session ID: 0x145
                State: <Active Ext>
                Local AS: 65001 Peer AS: 65020
                Age: 43 	Metric2: 0 
                Validation State: unverified 
                Task: BGP_65020.172.31.102.1
                Announcement bits (3): 3-KRT 5-BGP_RT_Background 6-Resolve tree 1 
                AS path: 65020 65002 I 
                Aggregator: 65002 172.16.2.2
                Accepted
                Localpref: 120
                Router ID: 172.31.102.1

lab@mxB:R3-1> 


lab@mxB:R3-1> configure 
Entering configuration mode

[edit]
lab@mxB:R3-1# delete protocols bgp group P3 import 

[edit]
lab@mxB:R3-1# show | compare 
[edit logical-systems R3-1 protocols bgp group P3]
-    import import-p3;

[edit]
lab@mxB:R3-1# commit and-quit 
commit complete
Exiting configuration mode

lab@mxB:R3-1>


Modifying the AS Path Attribute

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lab@mxC> show route 172.16.1.0/24 

inet.0: 25 destinations, 31 routes (25 active, 0 holddown, 4 hidden)
+ = Active Route, - = Last Active, * = Both

172.16.1.0/24      *[BGP/170] 00:57:12, localpref 100
                      AS path: 65412 65001 I, validation-state: unverified
                    >  to 172.22.122.2 via ge-0/0/3.0
                    [BGP/170] 00:57:11, localpref 100
                      AS path: 65412 65001 I, validation-state: unverified
                    >  to 172.22.124.2 via ge-0/0/1.0
                    [BGP/170] 01:26:49, localpref 100, from 172.16.2.2
                      AS path: 65020 65001 I, validation-state: unverified
                    >  to 10.0.14.2 via ge-0/0/0.0

lab@mxC>


mxB:R3-1
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lab@mxB:R3-1> configure 
Entering configuration mode

[edit]
lab@mxB:R3-1# top edit policy-options 

[edit policy-options]
lab@mxB:R3-1# copy policy-statement export-aggregate to policy-statement export-p3 

[edit policy-options]
lab@mxB:R3-1# show policy-statement export-p3 
term 1 {
    from {
        protocol aggregate;
        route-filter 172.16.1.0/24 exact;
    }
    then accept;
}
term 2 {
    from {
        route-filter 172.16.1.0/24 longer;
    }
    then reject;
}

[edit policy-options]
lab@mxB:R3-1# 



[edit policy-options]
lab@mxB:R3-1# edit policy-statement export-p3 

[edit policy-options policy-statement export-p3]
lab@mxB:R3-1# set term 1 then as-path-prepend 65002 

[edit policy-options policy-statement export-p3]
lab@mxB:R3-1# top 

[edit]
lab@mxB:R3-1# edit protocols bgp 

[edit protocols bgp]
lab@mxB:R3-1# set group P3 neighbor 172.31.102.1 export export-p3 

[edit protocols bgp]
lab@mxB:R3-1# commit and-quit 
commit complete
Exiting configuration mode

lab@mxB:R3-1>


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lab@mxC> show route 172.16.1.0/24    

inet.0: 25 destinations, 30 routes (25 active, 0 holddown, 4 hidden)
+ = Active Route, - = Last Active, * = Both

172.16.1.0/24      *[BGP/170] 00:59:27, localpref 100
                      AS path: 65412 65001 I, validation-state: unverified
                    >  to 172.22.122.2 via ge-0/0/3.0
                    [BGP/170] 00:59:26, localpref 100
                      AS path: 65412 65001 I, validation-state: unverified
                    >  to 172.22.124.2 via ge-0/0/1.0

lab@mxC>


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lab@mxA> configure 
Entering configuration mode

[edit]
lab@mxA# top edit policy-options policy-statement export-aggregate 

[edit policy-options policy-statement export-aggregate]
lab@mxA# show 
term 1 {
    from {
        protocol aggregate;
        route-filter 172.16.1.0/24 exact;
    }
    then accept;
}
term 2 {
    from {
        route-filter 172.16.1.0/24 longer;
    }
    then reject;
}

[edit policy-options policy-statement export-aggregate]
lab@mxA# set term 1 then as-path-prepend "65001 65001 65001" 

[edit policy-options policy-statement export-aggregate]
lab@mxA# top     

[edit]
lab@mxA# show | compare 
[edit policy-options policy-statement export-aggregate term 1 then]
+     as-path-prepend "65001 65001 65001";

[edit]
lab@mxA#


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lab@mxC> show route 172.16.1.0/24 

inet.0: 25 destinations, 30 routes (25 active, 0 holddown, 4 hidden)
+ = Active Route, - = Last Active, * = Both

172.16.1.0/24      *[BGP/170] 01:02:23, localpref 100
                      AS path: 65412 65001 I, validation-state: unverified
                    >  to 172.22.122.2 via ge-0/0/3.0
                    [BGP/170] 01:02:22, localpref 100
                      AS path: 65412 65001 I, validation-state: unverified
                    >  to 172.22.124.2 via ge-0/0/1.0

lab@mxC>


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lab@mxB:R3-1> configure 
Entering configuration mode

[edit]
lab@mxB:R3-1# top edit policy-options policy-statement export-p3 

[edit policy-options policy-statement export-p3]
lab@mxB:R3-1# show 
term 1 {
    from {
        protocol aggregate;
        route-filter 172.16.1.0/24 exact;
    }
    then {
        as-path-prepend 65002;
        accept;
    }
}
term 2 {
    from {
        route-filter 172.16.1.0/24 longer;
    }
    then reject;
}

[edit policy-options policy-statement export-p3]
lab@mxB:R3-1# delete term 1 then as-path-prepend 

[edit policy-options policy-statement export-p3]
lab@mxB:R3-1# top 

[edit]
lab@mxB:R3-1# show | compare 
[edit logical-systems R3-1 policy-options policy-statement export-p3 term 1 then]
-     as-path-prepend 65002;

[edit]
lab@mxB:R3-1# 


[edit]
lab@mxB:R3-1# commit and-quit 
commit complete
Exiting configuration mode

lab@mxB:R3-1>


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lab@mxC> show route 172.16.1.0/24    

inet.0: 25 destinations, 31 routes (25 active, 0 holddown, 4 hidden)
+ = Active Route, - = Last Active, * = Both

172.16.1.0/24      *[BGP/170] 01:04:20, localpref 100
                      AS path: 65412 65001 I, validation-state: unverified
                    >  to 172.22.122.2 via ge-0/0/3.0
                    [BGP/170] 01:04:19, localpref 100
                      AS path: 65412 65001 I, validation-state: unverified
                    >  to 172.22.124.2 via ge-0/0/1.0
                    [BGP/170] 00:00:21, localpref 100, from 172.16.2.2
                      AS path: 65020 65001 I, validation-state: unverified
                    >  to 10.0.14.2 via ge-0/0/0.0

lab@mxC>


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lab@mxA> configure 
Entering configuration mode

[edit]
lab@mxA# edit policy-options policy-statement export-aggregate 

[edit policy-options policy-statement export-aggregate]
lab@mxA# show 
term 1 {
    from {
        protocol aggregate;
        route-filter 172.16.1.0/24 exact;
    }
    then {
        as-path-prepend "65001 65001 65001";
        accept;
    }
}
term 2 {
    from {
        route-filter 172.16.1.0/24 longer;
    }
    then reject;
}

[edit policy-options policy-statement export-aggregate]
lab@mxA# delete term 1 then as-path-prepend 

[edit policy-options policy-statement export-aggregate]
lab@mxA# commit and-quit 
commit complete
Exiting configuration mode

lab@mxA> 


lab@mxA> show route receive-protocol bgp 172.22.121.2 

inet.0: 21 destinations, 26 routes (21 active, 0 holddown, 0 hidden)
  Prefix		  Nexthop	       MED     Lclpref    AS path
* 30.30.0.0/24            172.22.121.2                            65412 I
* 30.30.1.0/24            172.22.121.2                            65412 I
* 30.30.2.0/24            172.22.121.2                            65412 I
* 30.30.3.0/24            172.22.121.2                            65412 I
* 172.16.2.0/24           172.22.121.2                            65412 65002 I

inet6.0: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)

lab@mxA> 


lab@mxA> show route receive-protocol bgp 172.22.121.2 aspath-regex ".* 65002"   

inet.0: 21 destinations, 26 routes (21 active, 0 holddown, 0 hidden)
  Prefix		  Nexthop	       MED     Lclpref    AS path
* 172.16.2.0/24           172.22.121.2                            65412 65002 I

inet6.0: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)

lab@mxA> 



lab@mxA> configure 
Entering configuration mode

[edit]
lab@mxA# top edit policy-options 

[edit policy-options]
lab@mxA# set as-path remote-as ".* 65002"

[edit policy-options]
lab@mxA# edit policy-statement import-P1 

[edit policy-options policy-statement import-P1]
lab@mxA# set term 1 from protocol bgp 

[edit policy-options policy-statement import-P1]
lab@mxA# set term 1 from as-path remote-as 

[edit policy-options policy-statement import-P1]
lab@mxA# set term 1 then accept 

[edit policy-options policy-statement import-P1]
lab@mxA# set term 2 then reject 

[edit policy-options policy-statement import-P1]
lab@mxA# top             

[edit]
lab@mxA# edit protocols bgp group P1-P2 

[edit protocols bgp group P1-P2]
lab@mxA# set neighbor 172.22.121.2 import import-P1 

[edit protocols bgp group P1-P2]
lab@mxA# top 

[edit]
lab@mxA# show | compare 
[edit policy-options]
+   policy-statement import-P1 {
+       term 1 {
+           from {
+               protocol bgp;
+               as-path remote-as;
+           }
+           then accept;
+       }
+       term 2 {
+           then reject;
+       }
+   }
[edit policy-options]
+   as-path remote-as ".* 65002";
[edit protocols bgp group P1-P2 neighbor 172.22.121.2]
+     import import-P1;

[edit]
lab@mxA# commit and-quit 
commit complete
Exiting configuration mode

lab@mxA> 



lab@mxA> show route receive-protocol bgp 172.22.121.2 

inet.0: 21 destinations, 27 routes (21 active, 0 holddown, 4 hidden)
  Prefix		  Nexthop	       MED     Lclpref    AS path
* 172.16.2.0/24           172.22.121.2                            65412 65002 I

inet6.0: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)

lab@mxA> 



lab@mxA> show route advertising-protocol bgp 172.22.121.2 

inet.0: 21 destinations, 27 routes (21 active, 0 holddown, 4 hidden)
  Prefix		  Nexthop	       MED     Lclpref    AS path
* 40.40.0.0/24            Self                                    65020 I
* 40.40.1.0/24            Self                                    65020 I
* 40.40.2.0/24            Self                                    65020 I
* 40.40.3.0/24            Self                                    65020 I
* 172.16.1.0/24           Self                                    I

lab@mxA>


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lab@mxB:R3-1> configure 
Entering configuration mode

[edit]
lab@mxB:R3-1# top edit routing-options 

[edit routing-options]
lab@mxB:R3-1# set static route 172.16.10.0/24 reject 

[edit routing-options]
lab@mxB:R3-1# commit 
commit complete

[edit routing-options]
lab@mxB:R3-1#


mxA
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lab@mxA> show route advertising-protocol bgp 172.22.121.2 aspath-regex "()"  

inet.0: 22 destinations, 28 routes (22 active, 0 holddown, 4 hidden)
  Prefix		  Nexthop	       MED     Lclpref    AS path
* 172.16.1.0/24           Self                                    I
* 172.16.10.0/24          Self                                    I

lab@mxA> 

lab@mxA> configure 
Entering configuration mode

[edit]
lab@mxA# edit policy-options 

[edit policy-options]
lab@mxA# set as-path internal-as "()"

[edit policy-options]
lab@mxA# edit policy-statement export-aggregate 

[edit policy-options policy-statement export-aggregate]
lab@mxA# set term 3 from protocol bgp 

[edit policy-options policy-statement export-aggregate]
lab@mxA# set term 3 from as-path internal-as 

[edit policy-options policy-statement export-aggregate]
lab@mxA# set term 3 then reject 

[edit policy-options policy-statement export-aggregate]
lab@mxA# top 

[edit]
lab@mxA# show | compare 
[edit policy-options policy-statement export-aggregate]
     term 2 { ... }
+    term 3 {
+        from {
+            protocol bgp;
+            as-path internal-as;
+        }
+        then reject;
+    }
[edit policy-options]
    as-path remote-as { ... }
+   as-path internal-as "()";

[edit]
lab@mxA# commit and-quit 
commit complete
Exiting configuration mode

lab@mxA> 

lab@mxA> show route advertising-protocol bgp 172.22.121.2 aspath-regex "()" 

inet.0: 22 destinations, 28 routes (22 active, 0 holddown, 4 hidden)
  Prefix		  Nexthop	       MED     Lclpref    AS path
* 172.16.1.0/24           Self                                    I

lab@mxA>


References:

JUNIPER, BGP
juniper bgp
This post is licensed under CC BY 4.0 by the author.