Avaya Configuring IP Services Bedienungsanleitung Seite 73

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Seitenansicht 72
Starting IP Services with Site Manager
117356-A Rev. A 3-19
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.
Point-to-point connections using unnumbered interfaces can be configured to
advertise RIP, 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.
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.
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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