CASE STUDY 3

DIAL ON DEMAND ROUTING
DIAL ON DEMAND ROUTING

This case study should describe the use of DDR to connect a worldwide network that consists of a central site located in Mumbai and remote sites located in Chennai, Bangalore, and Hyderabad. The following scenarios should be considered:
Having the Central Site Dial Out
Describe the central and remote site configurations for three setups: a central site with one interface per remote site, a single interface for multiple remote sites, and multiple interfaces for multiple remote sites. Include examples of the usage of rotary groups and access lists.
Having Remote Sites Dial Out
A common configuration is one in which the remote sites place calls to the central site but the central site does not dial out. In a “star” topology, it is possible for all of the remote routers to have their serial interfaces on the same subnet as the central site serial interface. • Using DDR as a Backup to Leased Lines Describes the use of DDR as a backup method to leased lines and provides examples of how to use floating static routes on single and shared interfaces. • Using Leased Lines and Dial Backup Describes the use of Data Terminal Ready (DTR) dialing and V.25bis dialing with leased lines.

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