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DES-7200 Configuration Guide Chapter 6 BGP
Configuration
6-1
6 BGP Configuration
6.1 BGP Overview
The Border Gateway Protocol (BGP) is an Exterior Gateway Protocol (EGP)
designed for routers in different autonomous systems to communicate one
another. The goal is to exchange network reachability among different
autonomous systems (AS) and eliminate loops by the natural features of the BGP
protocol.
The BGP protocol uses the TCP protocol to transmit packets for its reliability.
The router which operates the BGP protocol is referred to as the BGP Speaker,
and the BGP Speakers which set up a BGP session are referred to as the BGP
Peers.
There are two modes of BGP session : IBGP (Internal BGP) and EBGP (External
BGP). The IBGP refers to the BGP session set up in an AS, while the EBGP
refers to the BGP session set up between different ASs. In a word, the EBGP
exchanges the route information among different ASs; the IBGP transits the route
information in an AS.
The BGP protocol features:
Support BGP-4
Support path attributes
ORIGN Attribute
AS_PATH Attribute
NEXT_HOP Attribute
MULTI_EXIT_DISC Attribute
LOCAL-PREFERENCE Attribute
ATOMIC_AGGREGATE Attribute
AGGREGATOR Attribute
COMMUNITY Attribute
ORIGINATOR_ID Attribute
CLUSTER_LIST Attribute