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Configuring OSPF Services

4-5

Running OSPF with point-to-multipoint network interfaces addresses two

problems: how to minimize the number of subnets and how to minimize the

number of interfaces required to support communications within the star topology.

With point-to-multipoint interfaces, each star topology requires only one subnet,

rather than one subnet for each PVC. Also, the hub needs to support only one

interface for each star rather than one interface for each PVC. This reduces the

demand for resources on the router.

Conﬁguring OSPF on a Circuitless Interface

In some conﬁgurations, you may want the router’s circuitless interface to be

treated as the interface for an OSPF internal route. To do this, you can add OSPF

to the circuitless interface.

Discovering and Conﬁguring Neighbors

OSPF

neighbors

are any two routers that have an interface to the same network. In

each OSPF network, routers use the Hello protocol to discover their neighbors and

maintain neighbor relationships. On a broadcast or point-to-point network, the

Hello protocol dynamically discovers neighbors; however, on a nonbroadcast

multiaccess network, you must manually conﬁgure neighbors.

The Hello protocol is responsible for ensuring that communication between

neighbors is bidirectional. Periodically, OSPF routers send out Hello packets over

all interfaces. Included in these Hello packets are

• The router’s priority

• The router’s Hello Timer and Dead Timer value

• A list of routers that have sent this router Hello packets on this interface

• The router’s choice for designated router and backup designated router

For instructions on using Site Manager to specify the type of network supported on an

OSPF interface, see the Type parameter on page 4-29.

For instructions on using Site Manager to add OSPF to the router’s circuitless interface,

see “Conﬁguring a Circuitless IP Interface” on page 2-62.

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Avaya Configuring IP Services Manual do Utilizador Página 143