Setup Guide

Neighbor AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/Pfx
20.20.20.1 200 0 0 0 0 0 00:00:00 0
For the router’s identifier, Dell EMC 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 EMC Networking OS Command Line Interface Reference Guide.
The following example shows the show ip bgp neighbors command output.
DellEMC#show ip bgp neighbors
BGP neighbor is 20.20.20.1, remote AS 200, external link
BGP remote router ID 1.1.1.1
BGP state ESTABLISHED, in this state for 00:05:22
Last read 00:00:00, Last write 00:00:07
Hold time is 90, keepalive interval is 30 seconds
Received 18 messages, 0 in queue
7 opens, 6 notifications, 0 updates
5 keepalives, 0 route refresh requests
Sent 26 messages, 0 in queue
7 opens, 0 notifications, 0 updates
19 keepalives, 0 route refresh requests
Route refresh request: received 0, sent messages 0
Minimum time between advertisement runs is 30 seconds
Minimum time before advertisements start is 0 seconds
For address family: IPv4 Unicast
BGP local RIB : Routes to be Added 0, Replaced 0, Withdrawn 0
InQ : Added 0, Replaced 0, Withdrawn 0
OutQ : Added 0, Withdrawn 0
Allow local AS number 0 times in AS-PATH attribute
Prefixes accepted 0, withdrawn 0 by peer, martian prefixes ignored 0
Prefixes advertised 0, denied 0, withdrawn 0 from peer
Connections established 0; dropped 0
Last reset never
No active TCP connection
Enabling four-byte autonomous system numbers
You can enable 4-byte support for configuring autonomous system numbers (ASN).
To enable 4-byte support for the BGP process, use the following command.
NOTE:
When creating BGP confederations, all the routers in the Confederation must be a 4-byte or 2-byte identified
routers. You cannot mix them.
● Enable 4-byte support for the BGP process.
CONFIG-ROUTER-BGP mode
bgp four-octect-as-support
Border Gateway Protocol (BGP)
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