Specifications

Overview of Dial Interfaces, Controllers, and Lines
Logical Interfaces
DC-7
Cisco IOS Dial Technologies Configuration Guide
Dialer Interfaces
A dialer interface is a parent interface that stores and projects protocol configuration information that is
common to all data (D) channels that are members of a dialer rotary group. Data packets pass through
dialer interfaces, which in turn initiate dialing for inbound calls. In most cases, D channels get their core
protocol intelligence from dialer interfaces.
Figure 5 shows packets coming into a dialer interface, which contains the configuration parameters
common to four D channels (shown as S0:0, S0:1, S0:2, and S0:3). All the D channels are members of
the same rotary group. Without the dialer interface configuration, each D channel must be manually
configured with identical properties. Dialer interfaces condense and streamline the configuration
process.
Figure 5 Dialer Interface and Its Neighboring Components
A dialer interface is user configurable and linked to individual B channels, where it delivers data packets
to their physical destinations. Dialer interfaces seize physical interfaces to cause packet delivery. If a
dialer interface engages in a multilink session, a dialer interface is in control of a virtual access interface,
which in turn controls S0:3 or chassis 2 S0:3, for example. A dialer interface is created with the interface
dialer global configuration command.
The following example shows a fully configured dialer interface:
Router# configure terminal
Router(config)# interface dialer 0
Router(config-if)# ip unnumbered loopback 0
Router(config-if)# no ip mroute-cache
Router(config-if)# encapsulation ppp
Router(config-if)# peer default ip address pool dialin_pool
Router(config-if)# dialer in-band
Router(config-if)# dialer-group 1
Router(config-if)# no fair-queue
Router(config-if)# no cdp enable
Router(config-if)# ppp authentication chap pap callin
Router(config-if)# ppp multilink
All the D channels are members of rotary group 1.
S0:0
S0:3
S0:1
S0:2
Dialer interface (parent)
Incoming
data packets
Incoming
data packets
S6489
PRI 1
B channels
PRI 2
B channels
PRI 3
B channels
PRI 4
B channels