Users Guide

10
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.
BGP is supported in Dell Networking OS version 8.3.19.0 for the S4820T platform
NOTE: For more information about conguring the border gateway protocol (BGP), refer to the BGP chapter in the Dell
Networking OS Conguration Guide .
This chapter contains the following sections:
• BGPv4 Commands
• MBGP Commands
• BGP Extended Communities (RFC 4360)
• IPv6 BGP 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 Conguration 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.
338
Border Gateway Protocol