29-10
Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter29 Configuring Multicast Routing
Customizing Multicast Routing
Step5 Click OK.

Changing the IGMP Version

By default, the ASA runs IGMP Version 2, which enables several additional features.
All multicast routers on a subnet must support the same version of IGMP. The ASA does not
automatically detect Version 1 routers and switch to Version 1. However, a mix of IGMP Version 1 and
2 hosts on the subnet works; the ASA running IGMP Version 2 works correctly when IGMP Version 1
hosts are present.
To control which version of IGMP is running on an interface,perform the following steps:
Step1 In the main ASDM window, choose Configuration > Device Setup > Routing > Multicast > IGMP >
Protocol.
Step2 Choose the interface whose version of IGMP you want to change from the table on the Protocol pane,
and click Edit.
The Configure IGMP Interface dialog box appears.
Step3 Choose the version number from the Version drop-down list.
Step4 Click OK.
Configuring PIM Features
Routers use PIM to maintain forwarding tables for forwarding multicast diagrams. When you enable
multicast routing on the ASA, PIM and IGMP are automatically enabled on all interfaces.
Note PIM is not supported with PAT. The PIM protocol does not use ports, and PAT only works with protocols
that use ports.
This section describes how to configure optional PIM settings and includes the following topics:
Enabling and Disabling PIM on an Interface, page 29-10
Configuring a Static Rendezvous Point Address, page29-11
Configuring the Designated Router Priority, page29-12
Configuring and Filtering PIM Register Messages, page29-12
Configuring PIM Message Intervals, page29-13
Configuring a Route Tree, page29-13
Filtering PIM Neighbors, page29-14

Enabling and Disabling PIM on an Interface

You can enable or disable PIM on specific interfaces. To enable or disable PIM on an interface, perform
the following steps: