Reference Guide

Border Gateway Protocol | 115

Border Gateway Protocol

Platforms support BGP according to the following table:

This chapter is intended to provide a general description of Border Gateway Protocol version 4 (BGPv4) as

it is supported in the Networking Operating System (FTOS).

This chapter includes the following topics:

• Protocol Overview

• Autonomous Systems (AS)

• Sessions and Peers

• Route Reflectors

• BGP Attributes

• Best Path Selection Criteria

• Weight

• Local Preference

• Multi-Exit Discriminators (MEDs)

• AS Path

• Next Hop

• Multiprotocol BGP

• Implementing BGP with FTOS

• Advertise IGP cost as MED for redistributed routes

• Ignore Router-ID for some best-path calculations

• 4-Byte AS Numbers

• AS4 Number Representation

FTOS version Platform support

IPv4: 8.3.11.2

IPv6: 9.0.0.0

8.3.7.0

7.8.1.0 S-Series