Users Guide

Border Gateway Protocol

BGP is an external gateway protocol that transmits interdomain routing information within and between autonomous systems

(AS). BGP version 4 (BGPv4) supports classless inter-domain routing (CIDR) and the aggregation of routes and AS paths.

Basically, two routers (called neighbors or peers) exchange information including full routing tables and periodically sent

messages to update those routing tables.

NOTE

: For more information about configuring the border gateway protocol (BGP), see the BGP section in the Dell

Networking OS Configuration Guide.

Topics:

• BGP IPv4 Commands

• MBGP Commands

• BGP Extended Communities (RFC 4360)

• IPv6 BGP Commands

• IPv6 MBGP Commands

BGP IPv4 Commands

Border Gateway Protocol (BGP) is an external gateway protocol that transmits interdomain routing information within and

between Autonomous Systems (AS). BGP supports classless interdomain routing (CIDR) and the aggregation of routes and AS

paths. Basically, two routers (called neighbors or peers) exchange information including full routing tables and periodically send

messages to update those routing tables.

NOTE

: Dell Networking OS supports 2-byte (16-bit) and 4-byte (32-bit) format for autonomous system numbers (ASNs),

where the 2-byte format is 1 to 65535 and the 4-byte format is 1 to 4294967295.

NOTE: Dell Networking OS supports dotted format as well as the traditional plain format for AS numbers. The dot format is

displayed when using the show ip bgp commands. To determine the comparable dot format for an ASN from a

traditional format, use ASN/65536. ASN%65536. For more information about using the 2– or 4-byte format, refer to the Dell

Networking OS Configuration Guide.

address-family

Enable the IPv4 multicast or the IPv6 address family.

S4820T

Syntax

address-family [ipv4 {multicast | vrf vrf-name} | ipv6 unicast [vrf vrf-name]]

Parameters

ipv4 multicast Enter the keyword ipv4 followed by the keyword multicast to enable BGPv4

multicast mode.

ipv4 vrf vrf-name Enter the keyword ipv4 followed by the keyword vrf and then the name of the

VRF to enable VRF mode.

Border Gateway Protocol 333