Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manual de usuario descargar pdf (Pagina 31)

Exterior Gateway Protocols (BGP/EGP)

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• 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 5-17

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 5-21

for a detailed

description of this feature and for configuration information.

BGP Implementation Notes

The guidelines in the following list are crucial to successful BGP configuration.

• BGP will not operate with an IP router in nonforwarding (host-only) mode.

Make sure that the routers you want BGP to operate with are in forwarding

mode.

• If you are using BGP for a multihomed AS (one that contains more than one

exit point), Nortel Networks strongly encourages you to use OSPF for your

IGP and BGP for your sole exterior gateway protocol, or use intra-AS IBGP

routing.

Caution:

If you do not follow these guidelines, BGP either will not work

efficiently or will become disabled on the interfaces involved.

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Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manual de usuario Pagina 31