HP ProCurve 5300xl Series Management Manual page 134

PIM-DM (Dense Mode) on the 5300xl Switches
PIM-DM Operation
These HP 5300XL multicast routers
support the state refresh feature but
must handle periodic flood-prune
cycles for the downstream routers
that lack this feature.
Video
Server
Video
Server
Video
Server
These HP 5300XL multicast routers
support the state refresh feature
and do not require periodic flood-
prune cycles for a given multicast
group, which frees up bandwidth
for other uses.
Figure 5-2. Example of Bandwidth Conservation in 5300XL Routing Switches with PIM-DM State Refresh
5-8
5304XL #4
Multicast
Multicast
5308XL #1
HP ProCurve
5304XL #3
5304XL #2
Other
Router
Other
Router
These multicast routers do
not have the state refresh
feature and thus require
periodic flood-prune
cycles to advertise active
multicast group. In this
case it may be better to
group these routers on the
same multicast tree to
avoid the additional flood/
prune cycles on the routers
that do support state
refresh.
Indicates Paths Requiring
Periodic Flood-Prune Cycles
for a Given Multicast Group