On-Demand Routing ("ODR") is an enhancement to
Cisco Discovery Protocol
Cisco Discovery Protocol (CDP) is a proprietary protocol, proprietary data link layer protocol developed by Cisco Systems in 1994 by Keith McCloghrie and Dino Farinacci. It is used to share information about other directly connected Cisco equipmen ...
(CDP), a
protocol
Protocol may refer to:
Sociology and politics
* Protocol (politics), a formal agreement between nation states
* Protocol (diplomacy), the etiquette of diplomacy and affairs of state
* Etiquette, a code of personal behavior
Science and technology
...
used to discover other
Cisco
Cisco Systems, Inc., commonly known as Cisco, is an American-based multinational digital communications technology conglomerate corporation headquartered in San Jose, California. Cisco develops, manufactures, and sells networking hardware, ...
devices on either broadcast or non-broadcast media.
With the help of CDP, it is possible to find the device type, the
IP address
An Internet Protocol address (IP address) is a numerical label such as that is connected to a computer network that uses the Internet Protocol for communication.. Updated by . An IP address serves two main functions: network interface ident ...
, the
Cisco IOS version running on the neighbor Cisco device, the capabilities of the neighbor device, and so on. In Cisco IOS software release 11.2, ODR was added to CDP to advertise the connected IP prefix of a
stub router via CDP. This feature takes an extra five bytes for each network or subnet, four
Bytes for the IP address, and one byte to advertise the
subnet mask along with the IP. ODR is able to carry
Variable Length Subnet Mask (VLSM) information.
External links
ODR Cisco introduction to ODR
Cisco protocols
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