Avaya Configuring IP Services Uživatelský manuál stáhnout pdf (Strana 149)

100

101

Configuring OSPF Services

4-11

• Receives (via the backbone) summaries from other border routers, uses this

information to create new routing summaries (which add in the cost of the

backbone routes), and forwards the new summaries to its attached areas.

The features and functions of OSPF border routers are described in the following

sections:

• Conﬁguring a Virtual Backbone Link through a Transit Area - page 4-11

• Deﬁning a Range for a Summary Route - page 4-13

• Conﬁguring Border Services for a Stub - page 4-13

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 4-4, BR1 and

BR2 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 4-5, 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.

Using Site Manager, you conﬁgure a border router by assigning the reserved backbone

ID (0.0.0.0) to one OSPF interface and an area ID to one or more additional OSPF

interfaces. For instructions, see the OSPF Area parameter on page 4-26.

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