Avaya Configuring IP Services Manual do Utilizador descarregar pdf (Página 45)

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101

IP Concepts, Terminology, and Features

303528-A Rev 00

1-17

Periodically, the routing table manager announces routes to other routers in the

network as follows:

1. The routing table manager forwards a route for advertisement to the protocol.

2. The protocol consults an announce policy to determine whether or not to

advertise the route to the network.

IP accept and announce policies and policy parameters are described in

Appendix B

IP import and export filters and filter parameters are described in Appendix C

Note: The way OSPF applies accept and announce policies to routing

information differs in several ways from the procedure shown in Figure 1-4.

OSPF link-state advertisements (LSAs) are received and placed in the link

state database (LSDB) of the router. The information in the LSDB is also

propagated to other routers in the OSPF routing domain. According to the

OSPF standard, all routers in a given area must maintain a similar database. To

maintain database integrity across the network, a router must not manipulate

received LSAs before propagating them to other routers. To accomplish this,

OSPF accept and announce policies act in the following manner:

OSPF accept policies control which OSPF non-self-originated external routing

information is passed to the routing table manager. The accept policies control

only what the local router uses; they do not affect the propagation of OSPF

internal and OSPF non-self-originated external information to other routers.

OSPF announce policies control which self-originated external routing updates

are placed into the LSDB for distribution according to the OSPF standard.

OSPF announce policies affect what other routers learn but only with regard to

the local router’s self-originated information.

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