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.

Border Gateway Protocol 434