BGP Confederations
In BGP, nodes running iBGP protocols must be interconnected forming a full mesh. Confederation solves the iBGP full-mesh network complexity and inefficiency by splitting a large autonomous system domain into smaller autonomous system domains, called member autonomous systems. Member autonomous systems can form eBGP connections among themselves, to prevent full-mesh connections among each iBGP-running node.
The bgp confederation identifier command tells the router that it is a member of a confederation and the confederation ID. The bgp confederation peers command lists the member AS to which the router is connected.
In the following example, R1, R2, and R3 are members of the same confederation with different AS numbers.
Topology
Figure 1-6: BGP Confederation
R1
#configure terminal | Enter configure mode. |
|---|---|
(config)#router bgp 400 | Assign the ASN value (400) to the router. |
(config-router)#bgp confederation identifier 1000 | Specify the BGP confederation ID, the externally visible autonomous system number that identifies the BGP confederation as a whole. |
(config-router)#bgp confederation peers 7000 | Specify the neighbor ASN value for confederation membership. |
(config-router)#neighbor 10.20.30.2 remote-as 7000 | Specify the neighbor’s IP address (10.20.30.2) and the ASN value of the neighbor (7000). |
(config-router)# address-family ipv4 unicast | Enter address-family ipv4 unicast mode |
(config-router-af)# neighbor 10.20.30.2 activate | Activate the neighbor under address family mode |
(config-router-af)#exit-address-family | Exit address-family mode. |
(config-router)#commit | Commit the candidate configuration to the running configuration. |
R2
#configure terminal | Enter configure mode. |
(config)#router bgp 7000 | Assign the ASN value (7000) to the router. |
(config-router)#bgp confederation identifier 1000 | Specify the BGP confederation ID. |
(config-router)#bgp confederation peers 400 90 | Specify the neighbor ASN values for confederation membership. |
(config-router)#neighbor 10.20.30.1 remote-as 400 | Specify the neighbor’s IP address (10.20.30.1) and the ASN value of the neighbor (400). |
(config-router)#neighbor 11.20.30.30 remote-as 90 | Specify the neighbor’s IP address (11.20.30.30) and the ASN value of the neighbor (90). |
(config-router)# address-family ipv4 unicast | Enter address-family ipv4 unicast mode |
(config-router-af)# neighbor 10.20.30.1 activate | Activate the neighbor under address family mode |
(config-router-af)# neighbor 11.20.30.30 activate | Activate the neighbor under address family mode |
(config-router-af)#exit-address-family | Exit address-family mode. |
(config-router)#commit | Commit the candidate configuration to the running configuration. |
R3
#configure terminal | Enter configure mode. |
|---|---|
(config-router)#router bgp 90 | Assign the ASN value (90) to the router. |
(config-router)#bgp confederation identifier 1000 | Specify the BGP confederation ID. |
(config-router)#bgp confederation peers 7000 | Specify the neighbor ASN value for confederation membership. |
(config-router)#neighbor 11.20.30.20 remote-as 7000 | Specify the neighbor’s IP address (11.20.30.20) and the ASN value of the neighbor (7000). |
(config-router)# address-family ipv4 unicast | Enter address-family ipv4 unicast mode |
(config-router-af)# neighbor 11.20.30.20 activate | Exit address-family mode. |
(config-router-af)#exit-address-family | Exit address-family mode. |
(config-router)#commit | Commit the candidate configuration to the running configuration. |
Validation
R2
#sh ip bgp summary
BGP router identifier 192.168.52.3, local AS number 7000
BGP table version is 1
0 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Down State/PfxRcd
10.20.30.1 4 400 5 5 1 0 0 00:01:36 0
11.20.30.30 4 90 2 3 1 0 0 00:00:24 0
Total number of neighbors 2
Total number of Established sessions 2
#show ip bgp neighbors
BGP neighbor is 10.20.30.1, remote AS 400, local AS 7000, external link
BGP version 4, local router ID 192.168.52.3, remote router ID 192.168.52.2
Neighbor under common administration
BGP state = Established, up for 00:01:25
Last read 00:01:25, 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
Received 4 messages, 0 notifications, 0 in queue
Sent 4 messages, 0 notifications, 0 in queue
Route refresh request: received 0, sent 0
Minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast
BGP table version 1, neighbor version 1
Index 1, Offset 0, Mask 0x2
Community attribute sent to this neighbor (both)
0 accepted prefixes
0 announced prefixes
Connections established 1; dropped 0
Local host: 10.20.30.2, Local port: 35108
Foreign host: 10.20.30.1, Foreign port: 179
Nexthop: 10.20.30.2
Nexthop global: fe80::a00:27ff:fe21:7ed2
Nexthop local: ::
BGP connection: non shared network
BGP neighbor is 11.20.30.30, remote AS 90, local AS 7000, external link
BGP version 4, remote router ID 192.168.56.103
Neighbor under common administration
BGP state = Established, up for 00:00:13
Last read 00:00:13, 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
Received 2 messages, 0 notifications, 0 in queue
Sent 3 messages, 0 notifications, 0 in queue
Route refresh request: received 0, sent 0
Minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast
BGP table version 1, neighbor version 1
Index 2, Offset 0, Mask 0x4
Community attribute sent to this neighbor (both)
0 accepted prefixes
0 announced prefixes
Connections established 1; dropped 0
Local host: 11.20.30.20, Local port: 179
Foreign host: 11.20.30.30, Foreign port: 33465
Nexthop: 11.20.30.20
Nexthop global: fe80::a00:27ff:fed0:57d1
Nexthop local: ::
BGP connection: non shared network
R1
#show ip bgp neighbors
BGP neighbor is 10.20.30.2, remote AS 7000, local AS 400, external link
BGP version 4, local router ID 192.168.52.2, remote router ID 192.168.52.3
Neighbor under common administration
BGP state = Established, up for 00:01:51
Last read 00:01:51, 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
Received 5 messages, 0 notifications, 0 in queue
Sent 6 messages, 0 notifications, 0 in queue
Route refresh request: received 0, sent 0
Minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast
BGP table version 3, neighbor version 3
Index 1, Offset 0, Mask 0x2
Community attribute sent to this neighbor (both)
0 accepted prefixes
0 announced prefixes
Connections established 1; dropped 0
Local host: 10.20.30.1, Local port: 179
Foreign host: 10.20.30.2, Foreign port: 35108
Nexthop: 10.20.30.1
Nexthop global: fe80::a00:27ff:fe50:6a9b
Nexthop local: ::
BGP connection: non shared network
#sh ip bgp summary
BGP router identifier 192.168.52.3, local AS number 400
BGP table version is 3
1 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Down State/PfxRcd
10.20.30.2 4 7000 5 6 3 0 0 00:01:57 0
Total number of neighbors 1
Total number of Established sessions 1
R3
#sh ip bgp neighbors
BGP neighbor is 11.20.30.20, remote AS 7000, local AS 90, external link
BGP version 4, local router ID 192.168.52.5, remote router ID 192.168.52.3
Neighbor under common administration
BGP state = Established, up for 00:00:04
Last read 00:00:04, 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
Received 2 messages, 0 notifications, 0 in queue
Sent 2 messages, 0 notifications, 0 in queue
Route refresh request: received 0, sent 0
Minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast
BGP table version 1, neighbor version 1
Index 1, Offset 0, Mask 0x2
Community attribute sent to this neighbor (both)
0 accepted prefixes
0 announced prefixes
Connections established 1; dropped 0
Local host: 11.20.30.30, Local port: 33465
Foreign host: 11.20.30.20, Foreign port: 179
Nexthop: 11.20.30.30
Nexthop global: fe80::a00:27ff:fe24:5dc9
Nexthop local: ::
BGP connection: non shared network
#sh ip bgp summary
BGP router identifier 192.168.56.103, local AS number 90
BGP table version is 1
0 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Down State/PfxRcd
11.20.30.20 4 7000 3 3 1 0 0 00:00:55 0
Total number of neighbors 1
Total number of Established sessions 1
Multiple Autonomous Systems
In the following example, R1 and R2 are members of the same confederation with the same AS numbers, and R3 is a member of the same confederation with a different AS number.
Topology
Figure 1-7: BGP Confederation with Multiple AS
R1
#configure terminal | Enter Configure Mode |
(config)#router bgp 400 | Assign the ASN value (400) to the router. |
(config-router)#bgp confederation identifier 1000 | Specify the BGP confederation ID. |
(config-router)#neighbor 10.20.30.2 remote-as 400 | Specify the neighbor’s IP address (10.20.30.2) and the ASN value of the neighbor (400). |
(config-router)# address-family ipv4 unicast | Enter address-family ipv4 unicast mode |
(config-router-af)# neighbor 10.20.30.2 activate | Activate the neighbor under address family mode |
(config-router-af)#exit-address-family | Exit address-family mode. |
(config-router)#commit | Commit the candidate configuration to the running configuration. |
R2
#configure terminal | Enter configure mode. |
|---|---|
(config)#router bgp 400 | Assign the ASN value (400) to the router. |
(config-router)#bgp confederation identifier 1000 | Specify the BGP confederation ID. |
(config-router)#bgp confederation peers 90 | Specify the neighbor ASN value for confederation membership. |
(config-router)#neighbor 10.20.30.1 remote-as 400 | Specify the neighbor’s IP address (10.20.30.1) and the ASN value of the neighbor (400). |
(config-router)#neighbor 11.20.30.30 remote-as 90 | Specify the neighbor’s IP address (11.20.30.30) and the ASN value of the neighbor (90). |
(config-router)# address-family ipv4 unicast | Enter address-family ipv4 unicast mode |
(config-router-af)# neighbor 10.20.30.1 activate | Activate the neighbor under address family mode |
(config-router-af)# neighbor 11.20.30.30 activate | Activate the neighbor under address family mode |
(config-router-af)#exit-address-family | Exit address-family mode. |
(config-router)#commit | Commit the candidate configuration to the running configuration. |
R3
#configure terminal | Enter configure mode. |
|---|---|
(config)#router bgp 90 | Assign the ASN value (90) to the router. |
(config-router)#bgp confederation identifier 1000 | Specify the BGP confederation ID. |
(config-router)#bgp confederation peers 400 | Specify the neighbor ASN value for confederation membership. |
(config-router)#neighbor 11.20.30.20 remote-as 400 | Specify the neighbor’s IP address (11.20.30.20) and the ASN value of the neighbor (400). |
(config-router)# address-family ipv4 unicast | Enter address-family ipv4 unicast mode |
(config-router-af)# neighbor 11.20.30.20 activate | Activate the neighbor under address family mode |
(config-router-af)#exit-address-family | Exit address-family mode. |
(config-router)#commit | Commit the candidate configuration to the running configuration. |
Validation
R2
#show ip bgp summary
BGP router identifier 192.168.52.3, local AS number 400
BGP table version is 1
0 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Down State/PfxRcd
10.20.30.1 4 400 16 16 1 0 0 00:07:27 0
11.20.30.30 4 90 32 42 1 0 0 00:00:27 0
Total number of neighbors 2
Total number of Established sessions 2
#show ip bgp neighbors
BGP neighbor is 10.20.30.1, remote AS 400, local AS 400, internal link
BGP version 4, local router ID 192.168.52.3, remote router ID 192.168.52.2
BGP state = Established, up for 00:08:10
Last read 00:08:10, 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
Received 18 messages, 0 notifications, 0 in queue
Sent 18 messages, 0 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 1, Offset 0, Mask 0x2
Community attribute sent to this neighbor (both)
0 accepted prefixes
0 announced prefixes
Connections established 1; dropped 0
Local host: 10.20.30.2, Local port: 35214
Foreign host: 10.20.30.1, Foreign port: 179
Nexthop: 10.20.30.2
Nexthop global: fe80::a00:27ff:fe21:7ed2
Nexthop local: ::
BGP connection: non shared network
BGP neighbor is 11.20.30.30, remote AS 90, local AS 400, external link
BGP version 4, remote router ID 192.168.56.103
Neighbor under common administration
BGP state = Established, up for 00:01:10
Last read 00:01:10, 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
Received 20 messages, 14 notifications, 0 in queue
Sent 42 messages, 2 notifications, 0 in queue
Route refresh request: received 0, sent 0
Minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast
BGP table version 1, neighbor version 1
Index 2, Offset 0, Mask 0x4
Community attribute sent to this neighbor (both)
0 accepted prefixes
0 announced prefixes
Connections established 1; dropped 0
Local host: 11.20.30.20, Local port: 179
Foreign host: 11.20.30.30, Foreign port: 33623
Nexthop: 11.20.30.20
Nexthop global: fe80::a00:27ff:fed0:57d1
Nexthop local: ::
BGP connection: non shared network
Last Reset: 00:01:36, due to BGP Notification sent
Notification Error Message: (OPEN Message Error/Bad Peer AS.)
R1
#show ip bgp neighbors
BGP neighbor is 10.20.30.2, remote AS 400, local AS 400, internal link
BGP version 4, local router ID 192.168.52.2, remote router ID 192.168.52.3
BGP state = Established, up for 00:08:41
Last read 00:08:41, 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
Received 34 messages, 0 notifications, 0 in queue
Sent 35 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 16, neighbor version 16
Index 1, Offset 0, Mask 0x2
Community attribute sent to this neighbor (both)
0 accepted prefixes
0 announced prefixes
Connections established 2; dropped 1
Local host: 10.20.30.1, Local port: 179
Foreign host: 10.20.30.2, Foreign port: 35214
Nexthop: 10.20.30.1
Nexthop global: fe80::a00:27ff:fe50:6a9b
Nexthop local: ::
BGP connection: non shared network
Last Reset: 00:09:03, due to BGP Notification sent
Notification Error Message: (OPEN Message Error/Bad Peer AS.)
#show ip bgp summary
BGP router identifier 192.168.52.2, local AS number 400
BGP table version is 16
1 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Down State/PfxRcd
10.20.30.2 4 400 34 38 16 0 0 00:08:44 0
Total number of neighbors 1
Total number of Established sessions 1
R3
#show ip bgp summary
BGP router identifier 192.168.52.5, local AS number 90
BGP table version is 1
0 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Down State/PfxRcd
11.20.30.20 4 400 2 2 1 0 0 00:00:15 0
Total number of neighbors 1
Total number of Established sessions 1
#show ip bgp neighbors
BGP neighbor is 11.20.30.20, remote AS 400, local AS 90, external link
BGP version 4, local router ID 192.168.52.5, remote router ID 192.168.52.3
Neighbor under common administration
BGP state = Established, up for 00:02:24
Last read 00:02:24, 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
Received 6 messages, 0 notifications, 0 in queue
Sent 6 messages, 0 notifications, 0 in queue
Route refresh request: received 0, sent 0
Minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast
BGP table version 1, neighbor version 1
Index 1, Offset 0, Mask 0x2
Community attribute sent to this neighbor (both)
0 accepted prefixes
0 announced prefixes
Connections established 1; dropped 0
Local host: 11.20.30.30, Local port: 33623
Foreign host: 11.20.30.20, Foreign port: 179
Nexthop: 11.20.30.30
Nexthop global: fe80::a00:27ff:fe24:5dc9
Nexthop local: ::
BGP connection: non shared network
Outside Autonomous System
In the following example, R1 and R2 are members of the same confederation with different AS numbers, and R3 is a member outside the confederation.
Topology
Figure 1-8: Single Confederation with Outside AS
R1
#configure terminal | Enter configure mode. |
|---|---|
(config)#router bgp 400 | Assign the ASN value (400) to the router. |
(config-router)#bgp confederation identifier 1000 | Specify the BGP confederation ID. |
(config-router)#bgp confederation peers 7000 | Specify the neighbor ASN value for confederation membership. |
(config-router)#neighbor 10.20.30.2 remote-as 7000 | Specify the neighbor’s IP address (10.20.30.2) and the ASN value of the neighbor (7000). |
(config-router)# address-family ipv4 unicast | Enter address-family ipv4 unicast mode |
(config-router-af)# neighbor 10.20.30.2 activate | Activate the neighbor under address family mode |
(config-router-af)#exit-address-family | Exit address-family mode. |
(config-router)#commit | Commit the candidate configuration to the running configuration. |
R2
(config)#configure terminal | Enter configure mode |
(config)#router bgp 7000 | Assign the ASN value (7000) to the router. |
(config-router)#bgp confederation identifier 1000 | Specify the BGP confederation ID. |
(config-router)#bgp confederation peers 400 | Specify the neighbor ASN value for confederation membership. |
(config-router)#neighbor 10.20.30.1 remote-as 400 | Specify the neighbor’s IP address (10.20.30.1) and the ASN value of the neighbor (400). |
(config-router)#neighbor 11.20.30.30 remote-as 90 | Specify the neighbor’s IP address (11.20.30.30) and the ASN value of the neighbor (90). |
(config-router)# address-family ipv4 unicast | Enter address-family ipv4 unicast mode |
(config-router-af)# neighbor 10.20.30.1 activate | Activate the neighbor under address family mode |
(config-router-af)# neighbor 11.20.30.30 activate | Activate the neighbor under address family mode |
(config-router-af)#exit-address-family | Exit address-family mode. |
(config-router)#commit | Commit the candidate configuration to the running configuration. |
R3
#configure terminal | Enter configure mode. |
|---|---|
(config)#router bgp 90 | Assign the ASN value (90) to the router. |
(config-router)#neighbor 11.20.30.20 remote-as 1000 | Specify the neighbor’s IP address (11.20.30.20) and the BGP confederation ID (1000). |
(config-router)# address-family ipv4 unicast | Enter address-family ipv4 unicast mode |
(config-router-af)# neighbor 11.20.30.20 activate | Activate the neighbor under address family mode |
(config-router-af)#exit-address-family | Exit address-family mode. |
(config-router)#commit | Commit the candidate configuration to the running configuration. |
Validation
R3
#show ip bgp neighbors
BGP neighbor is 11.20.30.20, remote AS 1000, local AS 90, external link
BGP version 4, local router ID 192.168.52.5, remote router ID 192.168.52.3
BGP state = Established, up for 00:01:10
Last read 00:01:10, 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
Received 112 messages, 1 notifications, 0 in queue
Sent 142 messages, 88 notifications, 0 in queue
Route refresh request: received 0, sent 0
Minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast
BGP table version 1, neighbor version 1
Index 1, Offset 0, Mask 0x2
Community attribute sent to this neighbor (both)
0 accepted prefixes
0 announced prefixes
Connections established 2; dropped 1
Local host: 11.20.30.30, Local port: 33951
Foreign host: 11.20.30.20, Foreign port: 179
Nexthop: 11.20.30.30
Nexthop global: fe80::a00:27ff:fe24:5dc9
Nexthop local: ::
BGP connection: non shared network
Last Reset: 00:01:26, due to BGP Notification sent
Notification Error Message: (OPEN Message Error/Bad Peer AS.)
#sh ip bgp summary
BGP router identifier 192.168.52.5, local AS number 90
BGP table version is 1
0 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Down State/PfxRcd
11.20.30.20 4 1000 113 230 1 0 0 00:01:13 0
Total number of neighbors 1
Total number of Established sessions 1
R2
#show ip bgp summary
BGP router identifier 192.168.52.3, local AS number 7000
BGP table version is 1
0 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Down State/PfxRcd
10.20.30.1 4 400 22 22 1 0 0 00:10:04 0
11.20.30.30 4 90 179 202 1 0 0 00:00:42 0
Total number of neighbors 2
Total number of Established sessions 2
#show ip bgp neighbors
BGP neighbor is 10.20.30.1, remote AS 400, local AS 7000, external link
BGP version 4, local router ID 192.168.52.3, remote router ID 192.168.52.3
Neighbor under common administration
BGP state = Established, up for 00:11:06
Last read 00:11:06, 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
Received 24 messages, 0 notifications, 0 in queue
Sent 24 messages, 0 notifications, 0 in queue
Route refresh request: received 0, sent 0
Minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast
BGP table version 1, neighbor version 1
Index 1, Offset 0, Mask 0x2
Community attribute sent to this neighbor (both)
0 accepted prefixes
0 announced prefixes
Connections established 1; dropped 0
Local host: 10.20.30.2, Local port: 35444
Foreign host: 10.20.30.1, Foreign port: 179
Nexthop: 10.20.30.2
Nexthop global: fe80::a00:27ff:fe21:7ed2
Nexthop local: ::
BGP connection: non shared network
BGP neighbor is 11.20.30.30, remote AS 90, local AS 1000, external link
BGP version 4, remote router ID 192.168.56.103
BGP state = Established, up for 00:01:44
Last read 00:01:44, 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
Received 93 messages, 88 notifications, 0 in queue
Sent 204 messages, 0 notifications, 0 in queue
Route refresh request: received 0, sent 0
Minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast
BGP table version 1, neighbor version 1
Index 2, Offset 0, Mask 0x4
Community attribute sent to this neighbor (both)
0 accepted prefixes
0 announced prefixes
Connections established 1; dropped 0
Local host: 11.20.30.20, Local port: 179
Foreign host: 11.20.30.30, Foreign port: 33951
Nexthop: 11.20.30.20
Nexthop global: fe80::a00:27ff:fed0:57d1
Nexthop local: ::
BGP connection: non shared network
Last Reset: 00:02:00, due to BGP Notification received
Notification Error Message: (OPEN Message Error/Bad Peer AS.)
R1
#sh ip bgp summary
BGP router identifier 192.168.52.2, local AS number 400
BGP table version is 34
1 BGP AS-PATH entries
0 BGP community entries
Neighbor V AS MsgRcv MsgSen TblVer InQ OutQ Up/Down State/PfxRcd
10.20.30.2 4 7000 77 91 34 0 0 00:10:18 0
Total number of neighbors 1
Total number of Established sessions 1
#sh ip bgp neighbors
BGP neighbor is 10.20.30.2, remote AS 7000, local AS 400, external link
BGP version 4, local router ID 192.168.52.2, remote router ID 192.168.52.3
Neighbor under common administration
BGP state = Established, up for 00:11:40
Last read 00:11:40, 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
Received 80 messages, 0 notifications, 0 in queue
Sent 82 messages, 12 notifications, 0 in queue
Route refresh request: received 0, sent 0
Minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast
BGP table version 35, neighbor version 35
Index 1, Offset 0, Mask 0x2
Community attribute sent to this neighbor (both)
0 accepted prefixes
0 announced prefixes
Connections established 3; dropped 2
Local host: 10.20.30.1, Local port: 179
Foreign host: 10.20.30.2, Foreign port: 35444
Nexthop: 10.20.30.1
Nexthop global: fe80::a00:27ff:fe50:6a9b
Nexthop local: ::
BGP connection: non shared network
Last Reset: 00:12:47, due to BGP Notification sent
Notification Error Message: (OPEN Message Error/Bad Peer AS.)
Last modified date: 10/16/2023