Dell Configuration Guide for the S4048–ON System 9.14.2.6

BGP global and address family configuration

Implementing BGP is divided into global and address family configuration.

BGP configuration command levels are grouped as high level and address family configuration. All independent commands are grouped at the beginning of the configuration and followed by separate sub commands specific to each address family.

Following is the order of BGP configuration:

• Global configuration — General configuration that is applied to BGP. For example, configuring BGP timer, Adding additional BGP paths, etc.

• Address family configuration — Configurations that are applied to a specific address family.

The BGP address family model consists of three address families such as IPv4 unicast, IPv4 multicast, and IPv6 unicast. The default address family is IPv4 unicast. The neighbors configured under CONFIGURATION-ROUTER-BGP mode is considered to be IPv4 unicast neighbor. The IPv4 routes are advertised or received irrespective of the address family configuration. To configure a neighbor for IPv4 multicast or IPv6 unicast, you have to create an appropriate address family and activate the neighbor in the respective address family configuration, as shown the following example configuration.

DellEMC(conf)#router bgp 10
DellEMC(conf-router_bgp)#neighbor 20.20.20.1 remote-as 200
DellEMC(conf-router_bgp)#neighbor 20.20.20.1 no shutdown
DellEMC(conf-router_bgp)#neighbor 2001::1 remote-as 200
DellEMC(conf-router_bgp)#neighbor 2001::1 no shutdown
DellEMC(conf-router_bgp)#address-family ipv4 multicast
DellEMC(conf-router_bgp_af)#neighbor 20.20.20.1 activate
DellEMC(conf-router_bgp_af)#exit
DellEMC(conf-router_bgp)#address-family ipv6 unicast
DellEMC(conf-router_bgpv6_af)#neighbor 2001::1 activate
DellEMC(conf-router_bgpv6_af)#exit