
Configuring Dial Services
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Although you must configure IP adjacent hosts, do not configure IPX adjacent
hosts. Adjacent hosts are unnecessary for IPX to work over PPP circuits.
An alternative to configuring adjacent hosts is to configure IP unnumbered
interfaces. An unnumbered interface is a point-to-point connection that does not
use an IP address. Instead, you configure the address to be 0.0.0.0. You can use
unnumbered interfaces to advertise routing information across the network. Since
all traffic over an unnumbered interface uses broadcast addressing at the link
layer, you do not need adjacent hosts.
Adjacent hosts and unnumbered interfaces are features of the router’s IP interface.
To configure these features, refer to Configuring IP Services.
ISDN Services
A router with built-in ISDN capability is a TE1 device, which is an
ISDN-compatible device. Your router, therefore, provides the S/T interface, which
defines the user-network boundary.
For BRI service, this interface follows the standards outlined in the ITU-T
recommendation I.430, the physical layer protocol that defines the S/T interface.
For PRI service, the interface follows the ITU-T recommendation I.431.
You only have an S interface if an NT2 device is present. An NT2 is a switch at
your site that connects your TE1 and TE2 equipment to the network.
Figure 3-6 shows the router’s place in a sample ISDN network.
Figure 3-6. Router in an ISDN Network
The following sections detail ISDN operation on your router.
Router
Digital
Line
S/T
U
TE1 NT1
ISDN
Network
DS0012A
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