Avaya Configuring IP Services Bedienungsanleitung Seite 156

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Configuring IP Services
4-18
Applying IP Policies to OSPF Interfaces
According to the OSPF standard, all routers in a given area must maintain a
similar routing database. To ensure the integrity of the database, the network
administrator must not use IP policies to manipulate link-state advertisements
before propagating them on an interface.
There are two ways, however, in which an IP policy can be applied to an OSPF
interface:
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 but only with regard to the local boundary router’s
self-originated information.
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.
Configuring Cost Metrics
In contrast to RIP (a distance-vector routing protocol), which considers only a hop
count in calculating the best path, OSPF considers a cost metric that you assign to
a path.
For instructions on specifying a tag value in an announce policy, see the announce Tag
parameter on page 9-35. For instructions on matching a tag value, see the accept policy
Tag parameter on page 9-12.
For instructions on using Site Manager to configure the router for automatic OSPF/BGP
tag generation, see the Tag Generation Method parameter on page 4-43 and the
announce policy Automatic Tag parameter on page 9-35.
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