Avaya Configuring IP Services Manual do Utilizador Página 246

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Configuring IP Services
7-58
117356-B Rev. 00
Configuring OSPF Accept and Announce Policies
OSPF requires that all routers in a given area maintain a similar routing database.
To ensure the integrity of the database, OSPF does not manipulate received
link-state advertisements before propagating them on an interface.
There are two situations, however, in which an IP policy can be applied to an
OSPF interface:
An OSPF accept policy can be used on a router to control which OSPF
non-self-originated external routing information is stored in the routing table.
This accept policy controls only what the local router uses; it does not affect
the propagation of non-self-originated external information to other routers.
An OSPF announce policy can be used on a boundary router to control which
self-originated external routing updates are placed in the link-state database
for distribution according to the OSPF standard. The announce policy affects
what other routers learn only with regard to the local boundary routers
self-originated information.
In configuring a policy, IP operates according to the following rules:
IP compares routing information against the
match
criteria in active policies.
Once a match occurs, IP reviews other matching policies for
precedence.
IP applies the matching policy with the highest precedence to the routing
information and takes the specified
action.
IP uses the values of any set criteria in the policy to change the content of the
routing information.
The following topics show you how to configure OSPF policies:
Topic Page
Defining an OSPF Accept Policy
7-59
Supplying Override Values for an OSPF Accept Policy 7-62
Specifying Matching Criteria for an OSPF Accept Policy 7-64
Defining an OSPF Announce Policy 7-66
Supplying Override Values for an OSPF Announce Policy 7-69
Supplying Matching Criteria for an OSPF Announce Policy 7-71
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