Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Instrukcja Użytkownika Pobierz pdf (Strona 33)

Exterior Gateway Protocols (BGP and EGP)

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BGP-4 Confederations

The BGP confederation feature can reduce the size and complexity of an IBGP

mesh by breaking large autonomous systems into a confederation of smaller

subautonomous systems. This division reduces the size of IBGP meshes and the

complexity of the associated configuration management. Other autonomous

systems view the confederation as a single AS with the confederation ID as its AS

number. BGP confederations are available only with BGP-4.

The BGP-4 confederation feature complies with RFC 1965 and provides the

following functions:

• Lets you configure a confederation ID on the router

• Implements new AS_PATH segment types

• Lets you configure new AS_PATH variables, AS_CONFED_SET and

AS_CONFED_SEQUENCE, for specifying confederation parameters

• Implements correct AS_PATH setting and manipulation to neighboring

autonomous systems that are within and outside the confederation

See “

Configuring BGP-4 Confederations” on page 3-21 for a detailed description

of this feature and for configuration information.

BGP-4 TCP MD5 Message Authentication

BGP-4 lets you configure the authentication of BGP messages by TCP MD5

signatures, in compliance with RFC 2385, “Protection of BGP Sessions via the

TCP MD5 Signature Option.” When BGP authentication is enabled, a BGP

speaker can verify that the BGP messages it receives from its peers are actually

from a peer and not from a third party masquerading as a peer.

See “

Configuring and Enabling MD5 Authentication” on page 4-22 for a detailed

description of this feature and for configuration information.

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Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Instrukcja Użytkownika Strona 33