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Configuring IP Services

2-4

Adding an Unnumbered IP Interface to a Point-to-Point Circuit

IP allows you to conﬁgure an interface on a point-to-point connection without

using an IP address. Such an interface is called an unnumbered interface. Point-to-

point connections using unnumbered interfaces can be conﬁgured to advertise RIP

(see Note), OSPF, IBGP, DVMRP, and static routes.

The ability to establish a point-to-point link using an unnumbered IP interface

helps alleviate two of the major problems caused by the continued rapid growth of

the Internet: exhaustion of Class B network addresses and exhaustion of the 32-bit

IP address space.

The network administrator associates each unnumbered interface with the IP

address of any numbered interface on the router, including the circuitless

interface. The router can support multiple unnumbered interfaces. Multiple

unnumbered interfaces can be associated with the same IP address.

Since all trafﬁc over an unnumbered interface uses broadcast addressing at the

link layer, neither an adjacent host speciﬁcation or address resolution is required.

For instructions on using Site Manager to add an unnumbered IP interface to a circuit,

see “Conﬁguring a Circuit and Adding an IP Interface” on page 2-32.

Note: The associated address assigned to the unnumbered interface

determines whether or not RIP conﬁgured to send updates in V1 mode will

advertise a subnetwork over the unnumbered interface. The associated address

also determines which mask is applied to RIP V1 updates received on that

interface. For unnumbered links using RIP V1, the deﬁned associated

addresses at each end of the link must belong to the same network and have

the same mask for routes to be exchanged correctly.

If a subnetwork on the router has the same mask as the associated address,

RIP V1 will advertise that subnet over the unnumbered interface. If the mask

on the subnetwork is different from the mask of the associated address, RIP V1

advertises only the natural network of the subnet.

We recommend that you select RIP2 mode for unnumbered interfaces. With

RIP2, RIP updates contain both the route and mask information.

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Avaya Configuring IP Services Manual de usuario Pagina 32