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29-10
Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter 29 Configuring Multicast Routing
Customizing Multicast Routing
Step 5 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:
Step 1 In the main ASDM window, choose Configuration > Device Setup > Routing > Multicast > IGMP >
Protocol.
Step 2 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.
Step 3 Choose the version number from the Version drop-down list.
Step 4 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, page 29-11
• Configuring the Designated Router Priority, page 29-12
• Configuring and Filtering PIM Register Messages, page 29-12
• Configuring PIM Message Intervals, page 29-13
• Configuring a Route Tree, page 29-13
• Filtering PIM Neighbors, page 29-14
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: