Configuration prerequisites
Before you configure DCC, complete the following configurations:
Identifying the topology of DCC application
Identify the following:
Which routers will provide DCC and how they are related to each other.
Which interfaces on the routers will provide DCC, and which roles they will play.
Which transmission medium will be used, PSTN or ISDN.
Making preparatory configuration
Before you configure DCC on an interface:
Identify the interface type (synchronous/asynchronous serial, ISDN BRI or PRI, or AUX) and configure physical interface parameters.
On the dialup interface, enable link layer protocol encapsulation, such as PPP.
Configure the routing protocol, such as RIP or OSPF, for example.
Configure the network protocol, such as IP.
Select a DCC approach, C-DCC or RS-DCC.
Configuring DCC parameters
Configure DCC parameters depending on the DCC approach you selected for basic DCC dial functions. Based on that, you can configure advanced functions such as MP, PPP callback, ISDN caller identification callback, ISDN leased line, auto-dial, and circular dialer string backup. You can also tune the attribute values of DCC dialup interfaces depending on link conditions.