Avaya Configuring IP, ARP, RARP, RIP, and OSPF Services Manuel d'utilisateur télécharger pdf (Page 243)

Customizing OSPF Services

308627-14.20 Rev 00

6-59

By definition, a border router has an interface to the backbone and interfaces to

one or more other areas. To configure an OSPF border router:

1. Assign the backbone ID (0.0.0.0) to an OSPF interface.

2. Assign an area ID to another OSPF interface.

Configuring a Virtual Link Through a Transit Area

Every border router must have a connection to the backbone. This connection can

be physical or virtual.

If the border router has an interface to the backbone network, that router is

considered to be physically connected to the backbone. In Figure 6-4

, border

router 1 and border router 2 are both physically connected to the backbone.

In some cases, it may not be possible to configure a border router with an interface

to the backbone network. If a path exists from the router to a border router

attached to the backbone, you can configure a virtual link. A virtual link is

modeled as an unnumbered point-to-point link and is considered to be attached to

the backbone.

In Figure 6-5

, for example, border router A has lost its interface to the backbone

network. In its place, the network administrator configured an interface to a

network in area 2. Through this network, border router A now has a neighbor

(border router B) that is connected physically to the backbone. The network

administrator can use border router B to configure a virtual link between border

router A and the backbone.

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Avaya Configuring IP, ARP, RARP, RIP, and OSPF Services Manuel d'utilisateur Page 243