Avaya Configuring IP Services Bedienungsanleitung PDF herunterladen (Seite 24)

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Configuring IP Services

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You can conﬁgure a preference value in the range of 1 to 16 for RIP, BGP, EGP,

OSFP external, and static routes. The preference of direct routes and OSPF intra-

area and interarea routes cannot be user-conﬁgured.

To assign a greater or lesser preference to a static route, you supply a value when

you deﬁne the route. For instructions, see the static route Preference parameter on

page 2-67.

To assign a preference to a route learned by RIP, OSPF, BGP, and EGP, you

conﬁgure an accept policy for the route. If an incoming route matches the policy,

IP assigns the preference value you specify to the route and considers the route for

possible inclusion in the routing table.

For instructions, see the Route Preference parameter on page 9-9.

Route Weights

Route-weight calculation is an internal tool that IP uses to facilitate selection of

the best route among alternative routes to the same destination. Route-selection

criteria are encoded into the route weight in a way that allows IP to compare

routes simply by comparing their weight values, regardless of route sources.

Appendix B contains a worksheet that you can you use to calculate route weights

in your conﬁguration.

Route-weight calculation increases the efﬁciency of the route-selection process

and at the same time reduces the size of the routing database, since all route

selection parameters for each route are encoded in a single integer — the weight

value — rather than stored in separate variables.

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