Reference Guide

210 | Border Gateway Protocol
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BGP IPv4 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 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
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
• bgp recursive-bgp-next-hop
• bgp regex-eval-optz-disable
• bgp router-id
• bgp soft-reconfig-backup
• capture bgp-pdu neighbor
• capture bgp-pdu max-buffer-size
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.