On 22/02/11 13:16, Aaron Riemer wrote:
Hey guys,
Quick question on something I am having trouble finding documentation on.
Does anyone know how a configured RP in a PIM SM implementation become aware
of all multicast groups within a particular network? Are they advertised via
PIM running on each PIM via the multicast routing table?
If I understand what you're asking, then no - RPs don't know about
"groups" in that way.
For a new multicast sender, the PIM DR on the sender vlan sends a PIM
register to the RP. The RP then performs an (s,g) join for the new
source, and and sends a register-stop telling the PIM DR to cease.
Multicast receiver state is propagated by PIM join packets.
In other words, the RP "knows" about a group when someone joins it or
sends to it.
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