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 all iBGP neighbors |
(config-router-af)#neighbor 3001::2 advertise additional-paths all | Configure R2 to select all available paths to send to all iBGP neighbors |
(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 |
R3
#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::1 additional-paths receive | Configure R3 to receive additional paths from all iBGP neighbors |
(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 neighbors 3001::2
BGP neighbor is 3001::2, remote AS 100, local AS 100, internal link
BGP version 4, remote router ID 10.12.5.92
BGP state = Established, up for 00:14:55
Last read 00:14:55, hold time is 90, keepalive interval is 30 seconds
Neighbor capabilities:
Route refresh: advertised and received (old and new)
Address family IPv4 Unicast: advertised and received
Address family IPv6 Unicast: advertised and received
Received 536 messages, 50 notifications, 0 in queue
Sent 611 messages, 3 notifications, 0 in queue
Route refresh request: received 0, sent 0
Minimum time between advertisement runs is 5 seconds
For address family: IPv4 Unicast
BGP table version 1, neighbor version 1
Index 5, Offset 0, Mask 0x20
Community attribute sent to this neighbor (both)
0 accepted prefixes
0 announced prefixes
For address family: IPv6 Unicast
BGP table version 38, neighbor version 38
Index 5, Offset 0, Mask 0x20
AF-dependant capabilities:
Add-Path Send Capability : advertised
Add-Path Receive Capability : received
Community attribute sent to this neighbor (both)
1 accepted prefixes
4 announced prefixes
Connections established 3; dropped 2
Local host: 3001::1, Local port: 38451
Foreign host: 3001::2, Foreign port: 179
Nexthop: 10.12.5.93
Nexthop global: 3001::1
Nexthop local: fe80::5054:ff:fe19:1758
BGP connection: shared network
Last Reset: 00:15:00, due to BGP Notification received
Notification Error Message: (Cease/Other Configuration Change.)
#show bgp ipv6 summary
BGP router identifier 10.12.5.93, local AS number 100
BGP table version is 38
2 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Down State/PfxRcd
1001::1 4 200 517 532 38 0 0 04:13:51 1
1002::1 4 200 520 533 38 0 0 04:13:51 1
1003::1 4 200 519 532 38 0 0 04:13:51 1
1004::1 4 200 518 532 38 0 0 04:13:51 1
3001::2 4 100 588 616 38 0 0 00:15:42 1
Total number of neighbors 5
Total number of Established sessions 5
#show bgp ipv6
BGP table version is 38, local router ID is 10.12.5.93
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
*> 1090::/64 1001::1(fe80::5054:ff:fe9c:b7e6)
0 100 0 200 i
* 1002::1(fe80::5054:ff:fe0d:f5e)
0 100 0 200 i
* 1003::1(fe80::5054:ff:fec7:1940)
0 100 0 200 i
* 1004::1(fe80::5054:ff:fe62:70d8)
0 100 0 200 i
*>i 9999::/64 2001::1 0 100 0 300 i
Total number of prefixes 2
#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 03:53:54 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 03:54:01 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 03:53:52 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: 3
Advertised to non peer-group peers:
3001::2
Last update: Wed Jan 11 03:53:48 2017
R3
#show bgp ipv6 neighbors 3001::1
BGP neighbor is 3001::1, remote AS 100, local AS 100, internal link
BGP version 4, remote router ID 10.12.5.93
BGP state = Established, up for 00:29:37
Last read 00:29:37, hold time is 90, keepalive interval is 30 seconds
Neighbor capabilities:
Route refresh: advertised and received (old and new)
Address family IPv4 Unicast: advertised and received
Address family IPv6 Unicast: advertised and received
Received 518 messages, 2 notifications, 0 in queue
Sent 520 messages, 1 notifications, 0 in queue
Route refresh request: received 0, sent 0
Minimum time between advertisement runs is 5 seconds
For address family: IPv4 Unicast
BGP table version 1, neighbor version 1
Index 5, Offset 0, Mask 0x20
Community attribute sent to this neighbor (both)
0 accepted prefixes
0 announced prefixes
For address family: IPv6 Unicast
BGP table version 268, neighbor version 268
Index 1, Offset 0, Mask 0x2
AF-dependant capabilities:
Add-Path Send Capability : received
Add-Path Receive Capability : advertised
Community attribute sent to this neighbor (both)
4 accepted prefixes
1 announced prefixes
Connections established 4; dropped 3
Local host: 3001::2, Local port: 179
Foreign host: 3001::1, Foreign port: 38451
Nexthop: 10.12.5.92
Nexthop global: 3001::2
Nexthop local: fe80::5054:ff:fe5d:bb79
BGP connection: shared network
Last Reset: 00:29:37, due to BGP Notification sent
Notification Error Message: (Cease/Other Configuration Change.)
#show bgp ipv6 summary
BGP router identifier 10.12.5.92, local AS number 100
BGP table version is 268
2 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Down State/PfxRcd
2001::1 4 300 533 537 268 0 0 04:16:42 1
2002::1 4 300 533 536 268 0 0 04:16:42 1
2003::1 4 300 537 538 268 0 0 04:16:42 1
2004::1 4 300 520 521 268 0 0 04:16:38 1
3001::1 4 100 520 521 268 0 0 00:29:41 4
Total number of neighbors 5
Total number of Established sessions 5
#show bgp ipv6
BGP table version is 268, 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 1004::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
* 2004::1(fe80::5054:ff:feb5:9a71)
0 100 0 300 i
* 2003::1(fe80::5054:ff:fe0d:b565)
0 100 0 300 i
* 2002::1(fe80::5054:ff:fed2:4666)
0 100 0 300 i
Total number of prefixes 2
R3#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:
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 04:08:51 2017
200
1004::1 (metric 20) from 3001::1 (10.12.5.93)
Origin IGP, metric 0, localpref 100, valid, internal
rx path_id: 3 tx path_id: -1
Not advertised to any peer
Last update: Wed Jan 11 04:09:43 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 04:09:43 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 04:09:43 2017