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4.3 | |
DDR Configuration | |
| 4.3.5 | |
Configuring DDR dialer information |
There are several steps involved in
configuring the DDR interface. PPP
is configured on the dialer interface using the same commands that
enable PPP on a serial interface. HDLC is the default encapsulation for
an ISDN interface on a Cisco router, but most networks employ PPP for
circuit-switched connections. Because of its robustness,
interoperability, and additional features such as authentication, PPP is
the data link protocol in use on the B channels of most routers. To
configure PPP on the DDR interface use the following commands:
A dialer list specifying the interesting
traffic for this DDR interface needs to be associated with the DDR
interface. This is done using the
dialer-group group-number
command:
In the command, group-number specifies the number of the dialer group to which the interface belongs. The group number can be an integer from 1 to 10. This number must match the dialer-list group-number. Each interface can have only one dialer group. However, the same dialer list can be assigned to multiple interfaces with the dialer-group command. The correct dialing information for the
remote DDR interface needs to be specified. This is done using the
dialer map
command. The dialer map command maps the remote protocol address to a telephone number. This command is necessary to dial multiple sites.
If dialing only one site, use an unconditional dialer string command that always dials the one phone number regardless of the traffic destination. This step is unique to legacy DDR. Although the information is always required, the steps to configure destination information are different when using dialer profiles instead of legacy DDR. The
dialer idle-timeout seconds
command may be used to specify the number of idle seconds before a call
is disconnected.
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The
seconds
represent the number of seconds until a call is disconnected after the
last interesting packet is sent. The default is 120.
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