Setup Guide

● ip-address: IP address of the neighbor
● peer-group name: 16 characters
● as-number: from 0 to 65535 (2 Byte) or from 1 to 4294967295 (4 Byte) or 0.1 to 65535.65535 (Dotted format)
NOTE: Neighbors that are defined using the neighbor remote-as command in the CONFIGURATION-ROUTER-
BGP mode exchange IPv4 unicast address prefixes only. To exchange other address prefixes (IPv6/IPv4 multicast), the
neighbors must be activated using neighbor activate command under the respective address family configuration
such as address-family ipv6 unicast (for IPv6) and address-family ipv4 multicast (for IPv4
multicast).
You must Configure Peer Groups before assigning it a remote AS.
4. Enable the BGP neighbor.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | ipv6–address | peer-group-name} no shutdown
5. Specify a network to this AS and add the routing information to the BGP routing table.
CONFIG-ROUTER-BGP mode
network ip-address mask
You can provide the mask IP address in slash format too. Eg. 10.10.21.0/24
6. Configure a fixed 32–bit router ID for the local device running BGP.
CONFIG-ROUTER-BGP mode
bgp router-id ip-address
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 4-byte AS
number using the show ip bgp summary command (displays a 4–byte AS number in bold).
Following is the configuration steps:
DellEMC# configure terminal
DellEMC(conf)# router bgp 65550
DellEMC(conf-router_bgp)# bgp four-octet-as-support
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)# network 10.10.21.0/24
DellEMC(conf-router_bgp)# bgp router-id 1.1.1.1
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 65550
bgp router-id 1.1.1.1
network 10.10.21.0/24
bgp four-octet-as-support
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 (4–byte AS number displays).
R2#show ip bgp summary
BGP router identifier 1.1.1.1, local 65550
BGP local RIB : Routes to be Added 0, Replaced 0, Withdrawn 0
1 neighbor(s) using 40960 bytes of memory
172
Border Gateway Protocol (BGP)