Administrator Guide

IPv4 and IPv6 address family
The IPv4 address family configuration in Dell EMC Networking OS is used for identifying routing sessions for protocols that use IPv4
address. You can specify multicast within the IPv4 address family. The default of address family configuration is IPv4 unicast. You can
configure the VRF instances for IPv4 address family configuration.
The IPv6 address family configuration is used for identifying routing sessions for protocols that use IPv6 address. You can specify unicast
within the IPv6 address family. You can configure the VRF instances for IPv6 address family configuration.
BGP address family model
Dell EMC Networking OS supports BGP address family identifier (AFI) with MBGP to provide scalability for multiple AFI and subsequent
address family identifier (SAFI) configurations. MBGP carries routing information for address families (IPv4 and IPv6) of multiple network-
layer protocols. Each address family has a separated BGP database, so that you can configure BGP policy based on address family.
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.
Example of BGP configuration command levels
Following is an example configuration, which explains the neighbor configuration for all the address families. Also, the configuration shows
how to create address families (IPv4 and IPv6) and activate the neighbors in the address family.
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
BGP global configuration default values
By default, BGP is disabled. The following table displays the default values for BGP on Dell EMC Networking OS.
Table 9. BGP Default Values
Item Default
BGP Neighbor Adjacency changes All BGP neighbor changes are logged.
Fast External Fallover feature Disabled
Graceful Restart feature Disabled
Local preference 100
MED 0
Route Flap Damping Parameters
half-life = 15 minutes
Border Gateway Protocol (BGP) 165