Avaya Configuring IP, ARP, RARP, RIP, and OSPF Services Manual de usuario Pagina 111

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Configuring and Customizing IP
308627-14.20 Rev 00
3-51
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 with routes learned over numbered interfaces, IP stores routes learned over
unnumbered interfaces in the routing table. The routing table entry for a route
learned over an unnumbered interface contains the following values:
You can configure point-to-point connections using unnumbered interfaces to
advertise RIP, OSPF, IBGP, DVMRP, and static routes.
The associated address assigned to the unnumbered interface determines whether
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.
If a subnetwork on the router has the same mask as the associated address, RIP1
or RIP2 aggregate mode will advertise that subnet over the unnumbered interface.
If the mask on the subnetwork is different from the mask of the associated
address, RIP1 or RIP2 aggregate mode advertises only the natural network of the
subnet.
Next-hop address 0.0.0.0
Next-hop mask 0.0.0.0
Next-hop interface Circuit number of the unnumbered interface
Note:
Unnumbered interfaces cannot be pinged directly, which can make it
difficult to diagnose router problems.
Note:
Nortel Networks recommends that you select RIP2 mode for
unnumbered interfaces. With RIP2, RIP updates contain both the route and
mask information.
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