Figure
shows a more complex topology set up with DDR. This topology is used for the extended configuration in which you see how you can combine the commands described earlier for DDR to set up an extended
access list to trigger an ISDN call. You may use many of the same commands for configuring a simple ISDN call.
Access lists can be applied to a dialer group to trigger dialing, and then you can apply that
dialer list to the interface. Table
describes the commands used in the configuration.
Note: Click on the topology to view
router configurations.
DDR is configured on router Cisco-a to connect with Cisco-b
or Cisco-c for all IP traffic except Telnet and FTP. The details about what is interesting to DDR are defined in an
access list.
The service provider provides other details that you must use when you configure your router for ISDN.
Configuring ISDN by using extended
access lists is more common in networks than configuring ISDN by
using a dialer list and dialer map statement, as is shown in the
previous configuration example.
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