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Distance Vector Multicast Routing Protocol (DVMRP) is an efficient Interior Gateway Protocol routing mechanism that combines Routing Information Protocol features with a truncated reverse path broadcasting algorithm for IP multitask data sharing between connectionless autonomous systems.
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DVMRP is defined by the Internet Engineering Task Force as RFC 1075.
Techopedia Explains Distance Vector Multicast Routing Protocol
DVRMP’s main tasks include:
- Tracks multicast datagram source paths
- Encapsulates packets as Internet Protocol (IP) datagrams
- Supports multicast IP datagram tunneling via unsupported encapsulated and addressed unicast packet routers
- Generates dynamic multicast IP delivery trees via reverse path multicasting and a distributed routing algorithm
- Exchanges routing datagrams made up of small, fixed-length headers and tagged data streams via Internet Group Management Protocol
- Handles tunnel and physical interfacing according to broadcast routing exchange source trees produced during truncated tree branch removal
- Manages reverse path forwarding for multicast traffic forwarding to downstream interfaces
DVMRP header components are as follows:
- Version
- Type
- Subtype: Response, request, non-membership report or non-membership cancellations
- Checksum: Complete message sum of 16-bit ones, not including IP headers. Requires 16-bit alignment. Checksum computation field is zero.
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