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https://www.juniper.net/documentation/en_US/junos/topics/concept/routing-protocol-bgp-optimal-route-reflector-understanding.html
https://github.com/dahai0013/vlabs/tree/master/vRR_config_1
set protocols bgp group bgp-orr type internal
set protocols bgp group bgp-orr local-address 11.11.11.11
set protocols bgp group bgp-orr cluster 11.11.11.11
set protocols bgp group bgp-orr optimal-route-reflection igp-primary 12.12.12.12
set protocols bgp group bgp-orr neighbor 12.12.12.12
root@vRR2> show route 51.148.72.88/31
inet.0: 14 destinations, 14 routes (14 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
51.148.72.88/31 *[BGP/170] 01:37:25, localpref 100, from 11.11.11.11
AS path: I, validation-state: unverified
> to 40.12.14.14 via em1.40
root@vRR2> show route protocol bgp detail
inet.0: 14 destinations, 14 routes (14 active, 0 holddown, 0 hidden)
51.148.72.88/31 (1 entry, 1 announced)
*BGP Preference: 170/-101
Next hop type: Indirect, Next hop index: 0
Address: 0xc632290
Next-hop reference count: 2
Source: 11.11.11.11
Next hop type: Router, Next hop index: 581
Next hop: 40.12.14.14 via em1.40, selected
Session Id: 0x141
Protocol next hop: 14.14.14.14
Indirect next hop: 0xb23e980 1048576 INH Session ID: 0x14a
State: <Active Int Ext>
Local AS: 65432 Peer AS: 65432
Age: 6:03 Metric2: 1000
Validation State: unverified
ORR Generation-ID: 0
Task: BGP_65432.11.11.11.11+179
Announcement bits (2): 0-KRT 4-Resolve tree 4
AS path: I (Originator)
Cluster list: 11.11.11.11
Originator ID: 14.14.14.14
Accepted
Localpref: 100
Router ID: 11.11.11.11
iso.0: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)
inet6.0: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)
root@vRR2>
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root@vRR1> show route 51.148.72.88/31
inet.0: 14 destinations, 24 routes (14 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
51.148.72.88/31 *[BGP/170] 01:40:53, localpref 100, from 13.13.13.13
AS path: I, validation-state: unverified
> to 20.11.13.13 via em1.20
[BGP/170] 01:38:15, localpref 100, from 14.14.14.14
AS path: I, validation-state: unverified
> to 10.11.12.12 via em1.10
to 20.11.13.13 via em1.20
root@vRR1> show isis bgp-orr
BGP ORR Peer Group: bgp-orr
Primary: 12.12.12.12, active
IPv4/IPv6 ORR Routes
--------------------
Prefix L Version Metric Type
12.12.12.12/32 2 82 0 int
13.13.13.13/32 2 82 2000 int
14.14.14.14/32 2 82 1000 int
22.22.22.22/32 2 82 2000 int
30.13.14.0/24 2 82 2000 int
40.12.14.0/24 2 82 1000 int
root@vRR1> show route protocol bgp 51.148.72.88/31 detail
inet.0: 14 destinations, 24 routes (14 active, 0 holddown, 0 hidden)
51.148.72.88/31 (2 entries, 2 announced)
*BGP Preference: 170/-101
Next hop type: Indirect, Next hop index: 0
Address: 0xc632350
Next-hop reference count: 7
Source: 13.13.13.13
Next hop type: Router, Next hop index: 583
Next hop: 20.11.13.13 via em1.20, selected
Session Id: 0x145
Protocol next hop: 13.13.13.13
Indirect next hop: 0xb23e380 1048575 INH Session ID: 0x147
State: <Active Int Ext>
Local AS: 65432 Peer AS: 65432
Age: 9:13 Metric2: 1000
Validation State: unverified
ORR Generation-ID: 1
Task: BGP_65432.13.13.13.13+179
Announcement bits (2): 0-KRT 4-Resolve tree 4
AS path: I
Accepted
Localpref: 100
Router ID: 13.13.13.13
BGP Preference: 170/-101
Next hop type: Indirect, Next hop index: 0
Address: 0xc632530
Next-hop reference count: 5
Source: 14.14.14.14
Next hop type: Router, Next hop index: 0
Next hop: 10.11.12.12 via em1.10, selected
Session Id: 0x0
Next hop: 20.11.13.13 via em1.20
Session Id: 0x0
Protocol next hop: 14.14.14.14
Indirect next hop: 0xb23e980 - INH Session ID: 0x0
State: <NotBest Int Ext>
Inactive reason: Not Best in its group - IGP metric
Local AS: 65432 Peer AS: 65432
Age: 6:35 Metric2: 2000
Validation State: unverified
ORR Generation-ID: 2
Task: BGP_65432.14.14.14.14+179
Announcement bits (1): 3-BGP_RT_Background
AS path: I
Accepted
Localpref: 100
Router ID: 14.14.14.14
root@vRR1> show route table inet.0 advertising-protocol bgp 51.148.72.2 51.148.72.88/31 detail
root@vRR1> show route table inet.0 advertising-protocol bgp 12.12.12.12 51.148.72.88/31 detail
inet.0: 14 destinations, 24 routes (14 active, 0 holddown, 0 hidden)
51.148.72.88/31 (2 entries, 2 announced)
BGP group bgp-orr type Internal
Nexthop: 14.14.14.14
Localpref: 100
AS path: [65432] I
Cluster ID: 11.11.11.11
Originator ID: 14.14.14.14
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