Protocol Independent Multicast-Sparse Mode (PIM-SM): Protocol Specification

Protocol Independent Multicast - Dense Mode (PIM-DM): Protocol Specification (Revised)

“…In the event of a discrepancy, PIM-SM [4] should be considered the definitive specification. All PIM control messages have IP protocol number 103.…”

Mobile hop-by-hop multicast routing

“…Nevertheless, source mobility is critical for multicast routing protocols that construct sourcespecific delivery trees (e.g., DVMRP [16], PIM-SSM [17]). Handling the mobile root of a source-specific multicast tree is more complex than the case of a shared tree (e.g., PIM-SM [18]). In the latter, a mobile source can send data without interruption, while moving; data reaches the Rendezvous Point (RP), and it is then forwarded on the shared tree.…”

“…One may argue that the first branching node in M-HBH has similar functionality to the RP in PIM-SM [18]. Nevertheless, the RP is relatively static, and is independent of the source's location.…”

“…PIM routers regularly send hello messages to discover neighbors and may send advertisements to choose RPs [18]. PIM-SSM reduces signaling, as it eliminates RPs.…”

Cisco Systems Router-port Group Management Protocol (RGMP)

“…Compliance with this specification requires that a switch MUST be able to elect a port for flooding through the presence of PIM Hello messages [4] arriving from the port and also through a manual configuration option. In addition, the switch SHOULD recognize a port connected to a router by other appropriate protocol packets or dedicated IPv4 multicast router discovery mechanisms such as MRDISC [11].…”