Dial-on-Demand Routing (DDR)
Definition - What does Dial-on-Demand Routing (DDR) mean?
Dial-on-Demand Routing (DDR) is a Cisco routing technique that initiates and closes circuit-switched data sessions on an automated and as-needed basis. DDR uses external terminal adapters that enable wide area network (WAN) routing connections via Public Switched Telephone Networks (PSTN) or Integrated Services Digital Networks (ISDN).
Techopedia explains Dial-on-Demand Routing (DDR)
DDR enables remote WAN data connections that automatically terminate after transmission activity ends. DDR is used with primary and backup connections. DDR connectivity is established in either of the following ways: Physical: A cable connects the PSTN to the computer's network interface card (NIC) for user communication. Digital: Point-to-Point Protocol (PPP) determines a connection logic for network signal function management (sending, receiving, compression). DDR provides a range of configuration commands, including: Phone companies establish connection switch types and local exchange termination points. Configuration depends on traffic setup triggers specified by standard or extended interface dialer access lists (like interesting traffic). Static routing remains constant to facilitate local and remote bidirectional reachability. During ISDN installation, PPP or High-Level Data Link Control (HDLC) enables encapsulation. After encapsulation, the host address implements IP addressing that is hard coded during global configuration or extracted from the local area network (LAN) interface address with the lowest number.
"Techopedia" on Twitter
Sign up for Techopedia's Free Newsletter!
Join thousands of others with our weekly newsletter
Free Whitepaper: The Path to Hybrid Cloud:
The Path to Hybrid Cloud: Intelligent Bursting To Amazon Web Services & Microsoft Azure
Free E-Book: Public Cloud Guide:
This white paper is for leaders of Operations, Engineering, or Infrastructure teams who are creating or executing an IT roadmap.
Free Tool: Virtual Health Monitor:
Virtual Health Monitor is a free virtualization monitoring and reporting tool for VMware, Hyper-V, RHEV, and XenServer environments.
Free 30 Day Trial – Turbonomic:
Turbonomic delivers an autonomic platform where virtual and cloud environments self-manage in real-time to assure application performance.