PIM Operating Modes

There are five operating PIM modes:

  1. PIM Dense Mode (PIM-DM)
  2. PIM Spare Mode (PIM-SM)
  3. PIM Spare Dense Mode
  4. PIM Source Specific Multicast (PIM-SSM)
  5. PIM Bidirectional Mode (Bidir-PIM)

PIM Control messages are sent using IP Protocol 103. Register and register stop messages can be sent using unicast, or multicast with a time-to-live of 1 to all PIM routers at address

IDTypeDestinationPIM Protocol
0Hello224.0.0.13 (all PIM routers)PIM-SM, PIM-DM, Bidir-PIM, SSM
1RegisterRP address (Unicast)PIM-SM
2Register StopFirst-hop router (Unicast)PIM-SM
3Join/prune224.0.0.13PIM-SM, Bidir-PIM, SSM
4Bootstrap224.0.0.13PIM-SM, Bidir-PIM
5Assert224.0.0.13PIM-SM, PIM-DM, Bidir-PIM
8Candidate RP AdvertisementBootstrap router (BSR) address (Unicast)PIM-SM, Bidir-PIM
9State Refresh224.0.0.13PIM-DM
10DF Election224.0.0.13Bidir-PIM
Control Message Types for PIM

Hello messages are sent every 30 seconds out PIM-Enabled interfaces.

Hello messages serve other purposes such as to elect a designated router and to form additional features.



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