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This chapter lists legacy dial-on-demand routing (DDR) commands that are used for configuring the "spoke" router in a hub-and-spoke network topology, explains the command syntax, and provides usage guidelines. A spoke router in a hub-and-spoke network configuration dials only one remote location: the network hub.
For information about configuring network spokes for legacy DDR and for configuration examples, refer to the "Configuring a Legacy DDR Network Spoke" chapter in the Dial Solutions Configuration Guide.
To clear the values of dialer statistics for one or more serial interfaces or Basic Rate Interfaces (BRIs) configured for DDR, use the clear dialer privileged EXEC command.
clear dialer [interface type number]| interface | (Optional) Indicates that one interface will be specified. |
| type | (Optional) Interface type, either async, serial, or bri. |
| number | (Optional) Interface number. |
| slot/port | Backplane slot number and port number on the interface. See your hardware installation manual for the specific slot and port numbers. |
Privileged EXEC
This command first appeared in Cisco IOS Release 11.0.
If the interface keyword and the arguments are not used, dialer statistics are cleared on all interfaces.
The following example clears the dialer statistics on serial interface 1:
clear dialer interface serial 1
To enable DDR on an interface and specify that the serial line is connected by non-V.25bis modems using Electronic Industries Association (EIA) signaling only--specifically, the data terminal ready (DTR) signal--use the dialer dtr interface configuration command. To disable dial-on-demand routing (DDR) for the interface, use the no form of this command.
dialer dtrThis command has no arguments or keywords.
Interface configuration
This command first appeared in Cisco IOS Release 10.0.
A serial interface configured for DTR dialing can place calls only; it cannot accept them.
When a local interface is configured for DTR dialing, the remote interface (that will be receiving the calls) can be configured for in-band dialing or not configured for anything but encapsulation, depending on the desired behavior. If the remote interface is expected to terminate a call when no traffic is transmitted for some time, it must be configured for in-band dialing (along with access lists and a dummy dialer string). If the remote interface is purely passive, no configuration is necessary.
Rotary groups cannot be configured for DTR dialing.
The dialer map and dialer string commands have no effect on DTR dialers.
The following example enables DDR and specifies DTR dialing on an interface:
dialer dtr
You can use the master indexes or search online to find documentation of related commands.
dialer in-band
dialer string (legacy DDR)
To specify that dial-on-demand routing (DDR) is to be supported, use the dialer in-band interface configuration command. To disable DDR for the interface, use the no form of this command.
dialer in-band [no-parity | odd-parity]| no-parity | (Optional) Indicates that no parity is to be applied to the dialer string that is sent out to the modem on synchronous interfaces. |
| odd-parity | (Optional) Indicates that the dialed number has odd parity (7-bit ASCII characters with the eighth bit as the parity bit) on synchronous interfaces. |
Disabled. By default, no parity is applied to the dialer string.
Interface configuration
This command first appeared in Cisco IOS Release 10.0.
The dialer in-band command specifies that chat scripts will be used on asynchronous interfaces and V.25bis will be used on synchronous interfaces. The parity keywords do not apply to asynchronous interfaces.
The parity setting applies to the dialer string that is sent out to the modem. If you do not specify a parity, or if you specify no parity, no parity is applied to the output number. If odd parity is configured, the dialed number will have odd parity (7-bit ASCII characters with the eighth bit as the parity bit.)
If an interface only accepts calls and does not place calls, the dialer in-band interface configuration command is the only command needed to configure it. If an interface is configured in this manner, with no dialer rotary groups, the idle timer never disconnects the line. It is up to the remote end (the end that placed the call) to disconnect the line based on idle time.
The following example specifies DDR for asynchronous interface 1:
interface async 1 dialer in-band
You can use the master indexes or search online to find documentation of related commands.
To specify the destination string (telephone number) to be called for interfaces calling a single site, use the dialer string interface configuration command. To delete the dialer string specified for the interface, use the no form of this command.
dialer string dial-string[:isdn-subaddress]| dial-string | String of characters to be sent to a DCE device. |
| :isdn-subaddress | (Optional) ISDN subaddress. |
No strings are predefined.
Interface configuration
This command first appeared in Cisco IOS Release 10.0.
To use this command on an asynchronous interface, you must define a modem chat script for the associated line by using the script dialer command. A script must be used to implement dialing.
Dialers configured as in-band pass the string to the external dialing device. Specify one dialer string command per interface.
In general, you include a dialer string command if you intend to use a specific interface to initiate a DDR call.
The string of characters specified for the dial-string argument is the default number used under the following conditions:
On synchronous interfaces, depending on the type of modem you are using, International Telecommunication Union Telecommunication (ITU-T) Standardization Sector V.25bis options might be supported as dial-string parameters of the dialer string command. Supported options are listed in Table 105. The functions of the parameters are nation specific, and they may have different implementations in your country. These options apply only if you have enabled DDR with the dialer in-band command. Refer to the operation manual for your modem for a list of supported options.
| Option | Description |
|---|---|
| : | Wait tone. |
| < | Pause.
Usage and duration of this parameter vary by country. |
| = | Separator 3.
For national use. |
| > | Separator 4.
For national use. |
| P | Dialing to be continued in pulse mode.
Optionally accepted parameter. |
| T | Tone. Dialing to be continued in Dual Tone Multifrequency (DTMF) mode.
Optionally accepted parameter. |
| & | Flash. (The flash duration varies by country.)
Optionally accepted parameter. |
The following example specifies a DDR telephone number to be tone-dialed on asynchronous interface 1 using the dialer string command:
interface async 1 dialer string T14085553434
dialer in-band
script dialer
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