Users Guide

Border Gateway Protocol IPv4

(BGPv4)

Border gateway protocol IPv4 (BGPv4) version 4 (BGPv4) is supported on Dell Networking OS

This chapter provides a general description of BGPv4 as it is supported in the Dell Networking operating

system (OS).

BGP is an external gateway protocol that transmits interdomain routing information within and between

autonomous systems (AS). The primary function of the BGP is to exchange network reachability information

with other BGP systems. BGP generally operates with an internal gateway protocol (IGP) such as open

shortest path first (OSPF) or router information protocol (RIP), allowing you to communicate to external ASs

smoothly. BGP adds reliability to network connections by having multiple paths from one router to another.

Topics:

• Autonomous Systems (AS)

• Sessions and Peers

• Route Reflectors

• Communities

• BGP Attributes

• Weight

• Local Preference

• Origin

• AS Path

• Next Hop

• Multiprotocol BGP

• Implement BGP with Dell Networking OS

• AS Number Migration

• BGP4 Management Information Base (MIB)

• Configuration Information

• Enabling BGP

• Configuring AS4 Number Representations

• Configuring Peer Groups

• Configuring BGP Fast Fall-Over

• Configuring Passive Peering

• Maintaining Existing AS Numbers During an AS Migration

• Allowing an AS Number to Appear in its Own AS Path

• Enabling Graceful Restart

• Enabling Neighbor Graceful Restart

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