Avaya Configuring IP, ARP, RIP, and OSPF Services Instrukcja Użytkownika Pobierz pdf (Strona 43)

IP Concepts, Terminology, and Features

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IP Routing Policies and Filters

The IP router allows you to control the flow of routing data to and from the

routing tables. This control is provided by two mechanisms:

• IP accept and announce policies

• IP import and export route filters

IP accept policies (and the subset of parameters provided by import filters) govern

the addition of new routes (derived from RIP, OSPF, BGP, or EGP) to the routing

tables. When RIP, OSPF, BGP, or EGP receives a new routing update, it consults

its accept policies to validate the information before entering the update into the

routing tables. Accept policies contain search information (to match fields in

incoming routing updates) and action information (to specify the action to take

with matching routes).

IP announce policies (and the subset of parameters provided by export filters)

govern the propagation of RIP, OSPF, BGP, or EGP routing information. When

preparing a routing advertisement, RIP, OSPF, BGP, or EGP consults its announce

policies to determine whether the routes to specific networks are to be advertised

and how they are to be propagated. Announce policies contain network numbers

(to associate a policy with a specific network) and action information (to specify a

route propagation procedure).

For information about BGP and EGP, see Configuring IP Exterior Gateway

Protocols (BGP and EGP).

Note:

Accept and announce policies provide a superset of the parameters

provided by import and export route filters. Bay Networks supports both IP

policies and IP route filters. However, if you are using import and export filters

for routing table management, you should migrate as soon as possible to IP

policies.

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Avaya Configuring IP, ARP, RIP, and OSPF Services Instrukcja Użytkownika Strona 43