
Starting IP Services
114065 Rev. A 2-17
Since all traffic over an unnumbered interface uses broadcast addressing at the
link layer, neither an adjacent host specification or 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.
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.
Note: BGP peers, NetBIOS, and BOOTP cannot be configured directly on an
unnumbered interface.
For information on using Site Manager to configure a BGP peer-to-peer
session on routers connected through unnumbered interfaces, see “Configuring
BGP Peers over an Unnumbered Point-to-Point Link” on page 5-5.
To route NetBIOS packets over an unnumbered interface, you must configure
a static entry to the Name Server.
To run BOOTP over unnumbered interfaces, you must select a preferred
BOOTP server. For instructions, see Configuring SNMP, BOOTP, DHCP, and
RARP Services.
Note: Unnumbered interfaces cannot be pinged directly. For this reason, such
interfaces can add to the difficulty of diagnosing router problems.
Comentários a estes Manuais