PIM-SM (Sparse Mode)
Configuring PIM-SM on the Router
Example of Configuring for PIM Support at the Global Level
PIM-SM
Router “A”
PIM-SM
Router “B”
PIM-SM
Router “C”
PIM-SM
Router “D”
Source of
Multicast
Group “X”
Host “Y”
S
P
T
P
a
t
h
Designated Router
(DR) for Unicast Source of
Multicast Group “X”
Elected Bootstrap Router
for the Domain, and
Elected Rendezvous
Point (RP) for Supporting
Multicast Group “X”
In default PIM-SM operation, the STP path
activates and the RPT path drops off after
the first multicast packet for a group is
received via the Rendezvous Point (RP).
Intermediate
Router in
RPT Path for
Group “X”
Figure 4-3. Example PIM-SM Domain with SPT Active To Support a Host that Has
Joined a Multicast Group
Using the topology shown above, router “B” is directly connected to the DR
for multicast group “X”. In this case, suppose that you want to globally
configure router “B” for PIM operation. On the global level, you would enable
the following:
■ IP routing
■ IP multicast routing
■ an IP routing protocol (RIP, OSPF, or static routing; use RIP for this
example)
ProCurve(config)# ip routing
ProCurve(config)# ip multicast-routing
ProCurve(config)# router rip
ProCurve(rip)# exit
ProCurve(config)# router pim
ProCurve(pim)# exit
ProCurve(config)#
Figure 4-4. Global Configuration for Supporting PIM-SM Operation
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