Selection of Best 3 Additional Paths at the Neighbor Level
R2
#configure terminal | Enter the Configure mode. |
(config)#router bgp 100 | Enter BGP router mode |
(config-router)#address-family ipv6 unicast | Enter address-family mode for neighbor router session to activate. |
(config-router-af)#neighbor 3001::2 additional-paths send | Configure R2 to send additional paths to the iBGP neighbor R3 |
(config-router-af)#neighbor 3001::2 advertise additional-paths best 3 | Configure R2 to advertise best 3 out of all available paths to R3 |
(config-router-af)#exit-address-family | Exit Address Family mode and return to Router mode. |
(config-router)#exit | Exit the router BGP mode and enter the config mode |
(config)#commit | Apply commit |
(config)#exit | Exit the config mode |
Validation
R2
#show bgp ipv6 1090::/64
BGP routing table entry for 1090::/64
Paths: (4 available, best #1, table Default-IP-Routing-Table)
Advertised to non peer-group peers:
1002::1 1003::1 1004::1
200
1001::1(fe80::5054:ff:fe9c:b7e6) from 1001::1 (10.12.5.144)
(fe80::5054:ff:fe9c:b7e6)
Origin IGP, metric 0, localpref 100, valid, external, best
rx path_id: -1 tx path_id: 0
Advertised to non peer-group peers:
3001::2
Last update: Wed Jan 11 06:34:49 2017
200
1002::1(fe80::5054:ff:fe0d:f5e) from 1002::1 (10.12.5.144)
(fe80::5054:ff:fe0d:f5e)
Origin IGP, metric 0, localpref 100, valid, external
rx path_id: -1 tx path_id: 1
Advertised to non peer-group peers:
3001::2
Last update: Wed Jan 11 06:34:49 2017
200
1003::1(fe80::5054:ff:fec7:1940) from 1003::1 (10.12.5.144)
(fe80::5054:ff:fec7:1940)
Origin IGP, metric 0, localpref 100, valid, external
rx path_id: -1 tx path_id: 2
Advertised to non peer-group peers:
3001::2
Last update: Wed Jan 11 06:34:49 2017
200
1004::1(fe80::5054:ff:fe62:70d8) from 1004::1 (10.12.5.144)
(fe80::5054:ff:fe62:70d8)
Origin IGP, metric 0, localpref 100, valid, external
rx path_id: -1 tx path_id: -1
Not advertised to any peer
Last update: Wed Jan 11 06:34:49 2017
R3
#show bgp ipv6 1090::/64
BGP routing table entry for 1090::/64
Paths: (3 available, best #1, table Default-IP-Routing-Table)
Advertised to non peer-group peers:
2001::1 2002::1 2003::1 2004::1
200
1001::1 (metric 20) from 3001::1 (10.12.5.93)
Origin IGP, metric 0, localpref 100, valid, internal, best
rx path_id: 0 tx path_id: 0
Not advertised to any peer
Last update: Wed Jan 11 06:36:11 2017
200
1003::1 (metric 20) from 3001::1 (10.12.5.93)
Origin IGP, metric 0, localpref 100, valid, internal
rx path_id: 2 tx path_id: -1
Not advertised to any peer
Last update: Wed Jan 11 06:36:53 2017
200
1002::1 (metric 20) from 3001::1 (10.12.5.93)
Origin IGP, metric 0, localpref 100, valid, internal
rx path_id: 1 tx path_id: -1
Not advertised to any peer
Last update: Wed Jan 11 06:36:53 2017
#show bgp ipv6
BGP table version is 410, local router ID is 10.12.5.92
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, l - labeled
S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i 1090::/64 1001::1 0 100 0 200 i
* i 1003::1 0 100 0 200 i
* i 1002::1 0 100 0 200 i
*> 9999::/64 2001::1(fe80::5054:ff:fe46:f549)
0 100 0 300 i
* 2002::1(fe80::5054:ff:fed2:4666)
0 100 0 300 i
* 2003::1(fe80::5054:ff:fe0d:b565)
0 100 0 300 i
* 2004::1(fe80::5054:ff:feb5:9a71)
0 100 0 300 i
Total number of prefixes 2