Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manual de usuario descargar pdf (Pagina 111)

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5-1

Chapter 5

Configuring BGP Accept and Announce Policies

Accept and announce policies control the flow of routing information in and out

of the routing table as follows:

• An accept policy determines the external routes that BGP includes in the IP

routing table.

• An announce policy determines the routes in the routing table that BGP

advertises to other routers.

To ensure that every BGP border router within an AS comes to the same decision

in constructing path attributes for an external path, routing policies must be

coordinated among all BGP speakers within an AS. Nortel Networks recommends

that the accept and announce policies on all IBGP connections accept and

advertise all routes. On external BGP connections, you must make consistent

routing policy decisions.

Note:

By default, an external BGP-3 or BGP-4 speaker will neither advertise

any routes to a peer, nor inject any routes into its IGP. Route policies must be

configured to enable any route advertisement.

Note:

In addition to announce and accept policies, Nortel Networks supports

import and export filters for BGP-3. Import and export filters provide a subset

of the parameters provided by the policies. For information about configuring

import and export filters, see Configuring IP, ARP, RARP, RIP, and OSPF

Services.

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Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manual de usuario Pagina 111