Owner's Manual

Chapter 27. Multicast Routing and Switching | 731
NETGEAR 8800 User Manual
when specifying the PIM-SSM range, you configure the range 232.0.0.0/8. You can also
choose to specify a different range for PIM-SSM by using a policy file.
To configure the PIM-SSM address range, use the following command:
configure pim ssm range [default | policy <policy-name>]
PIM Snooping
PIM snooping provides a solution for handling multicast traffic on a shared media network
more efficiently. In networks where routers are connected to a L2 switch, multicast traffic is
essentially treated as broadcast traffic (see
Figure 83).
Figure 83. Multicast Without PIM Snooping
IGMP snooping does not solve this flooding issue when routers are connected to a L2 switch.
Switch ports are flooded with multicast packets. PIM snooping addresses this flooding
behavior by efficiently replicating multicast traffic only onto ports which routers advertise the
PIM join requests (see
Figure 84).
Router 1
Router 4
Router 3
Router 2
RP
(Sender)
with
Receiver
EX_mcast_0018
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