HP 3500YL - Manual (Page 171)

PIM-SM (Sparse Mode)
Operating Notes
Operating Notes
Eliminating Redundancy in Support for a Multicast Group. Configur­
ing only one router in a domain as an RP for supporting traffic for a specific
multicast group eliminates support redundancy for that group. In this case, if
that router becomes unavailable then the group will be excluded from the
domain.
Excluding Multicast Groups. If all of the C-RPs and static-RPs (if any) in
a domain are configured to exclude some multicast groups or ranges of
groups, then multicast traffic for such groups will be dropped when received
by a DR, and will not be forwarded to any RP. (Such groups will still be
switched locally if IGMP is enabled on the VLAN where the excluded group
traffic is received from a multicast traffic source.)
Routing Table Entries. For multicast traffic from a source to the edge
router supporting a multicast receiver requesting the traffic, when an SPT
forms, the routing table (on the edge router) will contain both of the following
for the supported group:
■ an (S,G) entry for the source IP address and IP multicast group address
supported by the SPT
■ an (*,G) entry for the “any” (wildcard) source and (same) multicast group
supported by the RP tree
Flow Capacity. The router supports up to 2048 flows. Note that a router
acting as a DR or RP will have a significantly higher CPU load than other
routers in a PIM-SM domain.
IP Addresses Acquired Through DHCP. PIM-SM operation requires stati­
cally configured IP addresses and does not operate with IP addresses acquired
from a DHCP server.
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