10Border Gateway ProtocolBGP is an external gateway protocol that transmits interdomain routing information within and betweenautonomous systems (AS). BGP version 4 (BGPv4) supports classless inter-domain routing (CIDR) and theaggregation of routes and AS paths. Basically, two routers (called neighbors or peers) exchangeinformation including full routing tables and periodically sent messages to update those routing tables.BGP is supported in Dell Networking OS version 8.3.7.0 for the S4810 platformNOTE: For more information about configuring the border gateway protocol (BGP), refer to the BGPchapter in the Dell Networking OS Configuration Guide.This chapter contains the following sections:• BGPv4 Commands• MBGP Commands• BGP Extended Communities (RFC 4360)• IPv6 BGP CommandsBGP IPv4 CommandsBorder Gateway Protocol (BGP) is an external gateway protocol that transmits interdomain routinginformation 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 thoserouting tables.NOTE: Dell Networking OS supports 2-byte (16-bit) and 4-byte (32-bit) format for autonomoussystem numbers (ASNs), where the 2-byte format is 1 to 65535 and the 4-byte format is 1 to4294967295.NOTE: Dell Networking OS supports dotted format as well as the traditional plain format for ASnumbers. The dot format is displayed when using the show ip bgp commands. To determine thecomparable dot format for an ASN from a traditional format, use ASN/65536. ASN%65536. For moreinformation about using the 2– or 4-byte format, refer to the Dell Networking OS ConfigurationGuide.address-familyEnable the IPv4 multicast or the IPv6 address family.S4810Syntax address-family [ipv4 {multicast | vrf vrf-name} | ipv6 unicast]Parameters ipv4 multicast Enter the keyword ipv4 followed by the keywordmulticast to enable BGPv4 multicast mode.Border Gateway Protocol 373
