Avaya Configuring IP Services Instrukcja Użytkownika Strona 41

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IP Concepts, Terminology, and Features
114065 Rev. A 1-13
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 filters
IP accept policies (and the subset of parameters provided by import filters)
govern the addition of new RIP-, OSPF-, BGP-, or EGP-derived routes 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).
Every IP router maintains a table of current routing information. The routing
table manager receives routing updates from the network through the Internet
protocols running on the router. Periodically, the routing table manager issues
routing updates through the protocols. Figure 1-3 shows a router configured with
all of the Internet protocols supported by Bay Networks: OSPF, RIP, BGP-3,
BGP-4, and EGP. The arrows indicate the direction of flow of routing
information between the network and the protocols running on the router,
between the protocols and the routing table manager, and between the routing
table manager and the routing table.
Note: Accept and announce policies provide a superset of the parameters
provided by import and export filters. We currently support both IP policies
and IP route filters. However, network administrators using import and export
filters for routing table management should migrate as quickly as possible to
IP policies. In a future release, support for import and export filters will be
discontinued.
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