Command Line Interface
1154 1553-KDU 137 365 Uen D 2006-06-16
7.27.39 ip pim sparse-mode
This command enables PIM-SM on the specified interface. Use the no form to
disable PM-SM on the selected interface.
Syntax
[no] ip pim sparse-mode
Default Setting
Disabled
Command Mode
Interface Configuration (VLAN)
Command Usage
• PIM-SM must be enabled on each VLAN interface connected to the PIM
Sparse network. Internet Group Management Protocol (IGMP) must
also be enabled on each interface using the ip igmp command
(section 7.21.15 on page 953).
• A PIM-SM interface is used to forward multicast traffic only if a join
message is received from a downstream router or if group members are
directly connected to the interface. When routers want to receive a
multicast flow, they periodically send join messages to the RP, and are
subsequently added to the shared path for the specified flow back up to
the RP. If routers want to join the source path up through the SPT, they
periodically send join messages toward the source. They also send
prune messages toward the RP to prune the shared path if they have
already connected to the source through the SPT, or if there are no
longer any group members connected to the interface.
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