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Protocol-Independent Multicast
Last modified: Tuesday, October 15, 2002 

Abbreviated PIM, a multicasting routing protocol that runs over an existing unicast infrastructure. There are two variations of PIM:
  • PIM-SM -- Short for PIM-Sparse Mode, which is used when recipients are scattered over a large area.
  • PIM-DM -- Short for PIM-Dense Mode, which is used when the targeted recipients are in a concentrated area.
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PIM-SM Multicast Routing Protocol
This paper from Microsoft is an introduction to the PIM-SM multicast routing protocol, concentrating on version 2. It is intended for IT managers who are already familiar with multicasting, and who want an overview before reading the PIM-SM RFC.

RFC 2117
The full text of RFC 2117 detailing PIM-SM.




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