Enabling Bidirectional Mode - Cisco Catalyst 4500 Series Configuration Manual

Chapter 35 Configuring IP Multicast
If you configure sparse-dense mode, the idea of sparseness or denseness is applied to the group on the
switch, and the network manager should apply the same concept throughout the network.
Another benefit of sparse-dense mode is that Auto-RP information can be distributed in a dense-mode
manner; yet, multicast groups for user groups can be used in a sparse-mode manner. You do not need to
configure a default RP at the leaf routers.
When an interface is treated in dense mode, it is populated in a multicast routing table's outgoing
interface list when either of the following is true:
•
•
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:
•
•
To enable PIM to operate in the same mode as the group, enter this command:
Command
Switch(config-if)# ip pim
sparse-dense-mode

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:
Command
Switch(config)# ip pim bidir-enable
To configure Bidir-PIM, enter one of these commands, depending on which method you use to distribute
group-to-RP mappings:
OL-25340-01
When members or DVMRP neighbors exist on the interface
When PIM neighbors exist and the group has not been pruned
When members or DVMRP neighbors exist on the interface
When an explicit join has been received by a PIM neighbor on the interface
Purpose
Enables PIM to operate in sparse or dense mode,
depending on the group.
Purpose
Enables bidir-PIM on a switch.
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
Configuring IP Multicast Routing
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