Avaya Configuring IP, ARP, RIP, and OSPF Services Uživatelský manuál stáhnout pdf (Strana 59)

Starting IP Services

117356-E Rev 00

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Configuring an Unnumbered IP Interface

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. 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 of the 32-bit IP address

space.

You associate 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. Because all traffic over an unnumbered

interface uses broadcast addressing at the link layer, neither an adjacent host

specification nor address resolution is required.

As it does with routes learned over numbered interfaces, IP stores each route

learned over an unnumbered interface in the routing table. The routing-table entry

for a route learned over an unnumbered interface contains the following values:

Point-to-point connections using unnumbered interfaces can be configured to

advertise RIP, OSPF, IBGP, DVMRP, and static routes.

The associated address assigned to the unnumbered interface determines whether

or not RIP configured to send updates in Version 1 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.

Next-hop address 0

Next-hop mask 0

Next-hop interface Circuit number of the unnumbered interface

Note:

Unnumbered interfaces cannot be pinged directly. For this reason, such

interfaces can make it difficult to diagnose router problems.

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Avaya Configuring IP, ARP, RIP, and OSPF Services Uživatelský manuál Strana 59