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Software Configuration Guide—Release 15.0(2)SG
OL-23818-01
Chapter 33 Configuring IP Multicast
Configuring IP Multicast Routing
When an interface is treated in sparse mode, it is populated in a multicast routing table’s outgoing
interface list when either of the following is true:
• When members or DVMRP neighbors exist on the interface
• When an explicit join has been received by a PIM neighbor on the interface
To enable PIM to operate in the same mode as the group, enter this command:
Enabling Bidirectional Mode
Most of the configuration requirements for Bidir-PIM are the same as those for configuring PIM-SM.
You need not enable or disable an interface for carrying traffic for multicast groups in bidirectional
mode. Instead, you configure which multicast groups you want to operate in bidirectional mode. Similar
to PIM-SM, you can perform this configuration with Auto-RP, static RP configurations, or the PIM
Version 2 bootstrap router (PIMv2 BSR) mechanism.
To enable Bidir-PIM, perform this task in global configuration mode:
To configure Bidir-PIM, enter one of these commands, depending on which method you use to distribute
group-to-RP mappings:
Command Purpose
Switch(config-if)# ip pim
sparse-dense-mode
Enables PIM to operate in sparse or dense mode,
depending on the group.
Command Purpose
Switch(config)# ip pim bidir-enable
Enables bidir-PIM on a switch.
Command Purpose
Switch(config)# ip pim rp-address
rp-address [access-list] [override]
bidir
Configures the address of a PIM RP for a particular
group, and specifies bidirectional mode.
Use this command when you are not distributing
group-to-RP mappings using either Auto-RP or the
PIMv2 BSR mechanism
Switch(config)# ip pim rp-candidate
type number [group-list access-list]
bidir
Configures the router to advertise itself as a PIM
Version 2 candidate RP to the BSR, and specifies
bidirectional mode.
Use this command when you are using the PIMv2 BSR
mechanism to distribute group-to-RP mappings.
Switch(config)# ip pim send-rp-address
type number scope ttl-value
[group-list access-list] [interval
seconds] bidir
Configures the router to use Auto-RP to configure the
groups the router is willing to act as RP, and specifies
bidirectional mode.
Use this command when you are using Auto-RP to
distribute group-to-RP mappings.