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Protocol Independent Multicast - sparse mode
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draft-ietf-pim-sm-v2-new-xx
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Obsoletes
RFC 2362
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BSR
removed from PIM spec.
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explicit
join: assumes everyone does not want the data
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uses
unicast routing table for RPF
checking
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data
and joins are forwarded to RP for initial rendezvous
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all
routers in a PIM domain must have RP mapping
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when
load exceeds threshold forwarding swaps to shortest path tree (default
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is
first packet)
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state
increases (not everywhere) as number of sources and number of
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groups
increase
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source-tree
state is refreshed when data is forwarded and with Join/Prune
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control
messages
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