Avaya Configuring IP Services Manual de usuario Pagina 38

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Configuring IP Services
1-12 117356-A Rev. A
Route Preferences
The IP router maintains an internal routing table. When determining how to
forward a datagram, the IP router consults the table to determine the specific route
a datagram should take. A routing table can contain direct routes for the IP
router’s network interfaces, static routes, and the routes learned from RIP, OSPF,
BGP, and/or EGP, if enabled (information about adjacent hosts is maintained in a
separate table).
A routing table can contain multiple routes to the same destination. In such a
situation, IP uses (among other information) a preference value to determine
which route to select. Preference values range from 1 to 16 (the higher the
number, the greater the preference).
By default, RIP, BGP, EGP, and OSPF external routes have a preference value of
1. Static routes, direct routes, and OSPF intra-area and interarea routes have a
default preference of 16.
You can configure a preference value in the range of 1 to 16 for RIP, BGP, EGP,
OSFP external, and static routes. You cannot configure the preference of direct
routes and OSPF intra-area and interarea routes.
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.
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