Dell Z9000 Configuration Manual page 186

For the router's identifier, Dell Networking OS uses the highest IP address of the Loopback interfaces
configured. Because Loopback interfaces are virtual, they cannot go down, thus preventing changes in
the router ID. If you do not configure Loopback interfaces, the highest IP address of any interface is used
as the router ID.
To view the status of BGP neighbors, use the show ip bgp neighbors command in EXEC Privilege
mode as shown in the first example. For BGP neighbor configuration information, use the show
running-config bgp command in EXEC Privilege mode as shown in the second example.
NOTE: The showconfig command in CONFIGURATION ROUTER BGP mode gives the same
information as the show running-config bgp command.
The following example displays two neighbors: one is an external internal BGP neighbor and the second
one is an internal BGP neighbor. The first line of the output for each neighbor displays the AS number and
states whether the link is an external or internal (shown in bold).
The third line of the show ip bgp neighbors output contains the BGP State. If anything other than
ESTABLISHED is listed, the neighbor is not exchanging information and routes. For more information
about using the show ip bgp neighbors command, refer to the Dell Networking OS Command Line
Interface Reference Guide.
Dell#show ip bgp neighbors
BGP neighbor is 10.114.8.60, remote AS 18508, external link
BGP version 4, remote router ID 10.20.20.20
BGP state ESTABLISHED, in this state for 00:01:58
Last read 00:00:14, hold time is 90, keepalive interval is 30 seconds
Received 18552 messages, 0 notifications, 0 in queue
Sent 11568 messages, 0 notifications, 0 in queue
Received 18549 updates, Sent 11562 updates
Minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast
BGP table version 216613, neighbor version 201190
130195 accepted prefixes consume 520780 bytes
Prefix advertised 49304, rejected 0, withdrawn 36143
Connections established 1; dropped 0
Last reset never
Local host: 10.114.8.39, Local port: 1037
Foreign host: 10.114.8.60, Foreign port: 179
BGP neighbor is 10.1.1.1, remote AS 65535, internal link
Administratively shut down
BGP version 4, remote router ID 10.0.0.0
BGP state IDLE, in this state for 17:12:40
Last read 17:12:40, hold time is 180, keepalive interval is 60 seconds
Received 0 messages, 0 notifications, 0 in queue
Sent 0 messages, 0 notifications, 0 in queue
Received 0 updates, Sent 0 updates
Minimum time between advertisement runs is 5 seconds
For address family: IPv4 Unicast
BGP table version 0, neighbor version 0
0 accepted prefixes consume 0 bytes
Prefix advertised 0, rejected 0, withdrawn 0
Connections established 0; dropped 0
186
Border Gateway Protocol IPv4 (BGPv4)