Administrator Guide

CONFIGURATION mode
router bgp as-number
• as-number: from 0 to 65535 (2 Byte) or from 1 to 4294967295 (4 Byte) or 0.1 to 65535.65535 (Dotted format).
Only one AS is supported per system.
NOTE: If you enter a 4-Byte AS number, 4-Byte AS support is enabled automatically.
2. Add a BGP neighbor or peer and AS number.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | ipv6-address| peer-group name} remote-as as-number
• ip-address: IPv4 address of the neighbor
• ipv6-address: IPv6 address of the neighbor
• peer-group name: Name of the peer group. It can contain 16 characters.
• as-number: Autonomous number
NOTE: Neighbors that are defined using the neighbor remote-as command in the CONFIGURATION-ROUTER-
BGP mode exchange IPv4 unicast address prefixes only.
3. Enable the BGP neighbor.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | ipv6–address | peer-group-name} no shutdown
NOTE: When you change the configuration of a BGP neighbor, always reset it by entering the clear ip bgp *
command in EXEC Privilege mode.
To view the BGP configuration, enter show config in CONFIGURATION ROUTER BGP mode. To view the BGP status, use the show
ip bgp summary command in EXEC Privilege mode. The example shows that the summary with a 2-byte AS number using the show
ip bgp summary command.
Following is the configuration steps:
DellEMC# configure terminal
DellEMC(conf)# router bgp 65535
DellEMC(conf-router_bgp)# neighbor 20.20.20.1 remote-as 20
DellEMC(conf-router_bgp)# neighbor 20.20.20.1 no shutdown
DellEMC(conf-router_bgp)#exit
DellEMC(conf)#
The following example shows verifying the BGP configuration using the show running-config bgp command..
DellEMC#show running-config bgp
!
router bgp 65535
neighbor 20.20.20.1 remote-as 20
neighbor 20.20.20.1 no shutdown
DellEMC#
Examples of the show ip bgp Commands
The following example shows the show ip bgp summary command output.
R2#show ip bgp summary
BGP router identifier 1.1.1.1, local 65535
BGP local RIB : Routes to be Added 0, Replaced 0, Withdrawn 0
1 neighbor(s) using 40960 bytes of memory
Neighbor AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/Pfx
20.20.20.1 20 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.
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Border Gateway Protocol (BGP)