Cisco Cisco IOS Software Release 12.2(33)SXH

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PIM Dense Mode Fallback Prevention in a 
Network Following RP Information Loss 
The PIM Dense Mode Fallback Prevention in a Network Following RP Information Loss feature enables 
you to prevent PIM dense mode (PIM-DM) fallback when all rendezvous points (RPs) fail. Preventing 
the use of PIM dense mode is very important to multicast networks whose reliability is critical. This 
feature provides a mechanism to keep the multicast groups in sparse mode, thereby preventing dense 
mode flooding. 
Configuration Information
Configuration information is included in the “Configuring Basic IP Multicast” at the following URL:
The following sections provide information about this feature:
Configuring Sparse Mode with Auto-RP
For a complete list of features included in the “Configuring Basic IP Multicast” module, see the Feature 
Information table located toward the end of the module.