Service Manual

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.
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.
NOTE: Use this attribute to start a BGP instance corresponding to either
a specific address family in a default VRF or an IPv4 address family in a non-
default VRF.
ipv6 unicast Enter the keyword ipv6 followed by the keyword unicast to enable BGPv6
mode.
9
Border Gateway Protocol 305