Avaya Configuring IP Services Bedienungsanleitung Seite 162

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Configuring IP Services
5-32 114065 Rev. A
By definition, a border router has an interface to the backbone and interfaces to
one or more other areas. To configure OSPF as a border router:
1. Assign the backone ID (0.0.0.0) to an OSPF interface
2. Assign an area ID to another OSPF interface
The features and functions of OSPF border routers are described in the following
sections:
Configuring a Virtual Backbone Link through a Transit Area -- page 5-32
Defining a Range for a Summary Route -- page 5-34
Configuring Border Services for a Stub -- page 5-34
Configuring a Virtual Backbone 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 a backbone network, that router is
considered to be physically connected to the backbone. In
Figure 5-6, 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 a backbone network. If the router has an OSPF neighbor that is physically
connected to the backbone, the router can use that neighbor to establish a virtual
link to the backbone.
In
Figure 5-7, for example, Border router 1 has lost its interface to the backbone
network. In its place, the network administrator has configured an interface to a
network in Area B. Through this network, Border router 1 now has a neighbor --
Border Router 2 -- that is connected physically to the backbone. The network
administrator can use Border router 2 to configure a virtual link between Border
Router 1 and the backbone.
An area that provides a virtual link between a border router and the backbone is
considered to be a transit area. In
Figure 5-7, Area B functions as a transit area.
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