Reference Guide

304 | Border Gateway Protocol IPv4 (BGPv4)
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BGPv4 Commands
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 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.
The following commands enable you to configure and enable BGP.
• address-family
• aggregate-address
• bgp add-path
• bgp always-compare-med
• bgp asnotation
• bgp bestpath as-path ignore
• bgp bestpath as-path multipath-relax
• bgp bestpath med confed
• bgp bestpath med missing-as-best
• bgp bestpath router-id ignore
• bgp client-to-client reflection
• bgp cluster-id
• bgp confederation identifier
• bgp confederation peers
• bgp dampening
• bgp default local-preference
• bgp enforce-first-as
• bgp fast-external-fallover
• bgp four-octet-as-support
• bgp graceful-restart
• bgp log-neighbor-changes
• bgp non-deterministic-med
Note: FTOS Version 7.7.1 supports 2-Byte (16-bit) and 4-Byte (32-bit) format for Autonomous System
Numbers (ASNs), where the 2-Byte format is 1-65535, the 4-Byte format is 1-4294967295.
Note: FTOS Version 8.3.1.0 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 FTOS Configuration Guide.