Avaya Configuring IP Services Uživatelský manuál stáhnout pdf (Strana 25)

100

101

IP Concepts, Terminology, and Features

1-13

Using selection criteria encoded in the route weight, IP chooses routes in the

following order:

• The route with the highest preference value (see “Route Preferences” on

page 1-11)

• A direct or OSPF intra-area route with the lowest metric

• A direct route with the lowest metric

• An OSPF intra-area route with the lowest metric

• An OSPF interarea route with the lowest metric

• An OSPF Type 1 external route with the lowest metric

• A BGP route with the highest LOCAL_PREF value

• A RIP route with the lowest metric

• An EGP route with the lowest metric

• A static route with the lowest metric

• An OSPF Type 2 external route with a pre-Version-8.00-style metric

Note: Beginning with Version 8.00, a direct route (interface) that is part of an

OSPF area is not automatically chosen over an OSPF intra-area route. As a

result, it is possible to conﬁgure a slow direct link (for example, a backup

dialup line) with a high metric value (wfIpInterfaceCost) and route packets to

a fast link on another router in the same OSPF area. Direct routes that are not

included in an OSPF area are assumed to have a metric of 0 and are always

chosen over other routes.

Note: If OSPF is conﬁgured to propagate external routes using the route

weight as the Type 2 metric, routes that are received as OSPF ASE Type 2

routes are evaluated according to their respective origins (for example, RIP or

BGP).

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