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Configuration prerequisites

Before you can configure DVMRP, you must prepare the router as follows:

1. Configure an IP interface.
2. Disable PIM-SM from the interface on which you want to configure DVMRP because you cannot configure PIM-SM and DVMRP on the same interface.
   
   

   Note: Changing the configuration from PIM to DVMRP, or from DVMRP to PIM, is not recommended while multicast traffic is flowing on the network.

   
   
1. A switch can have a mix of DVMRP and PIM-SM interfaces if it is configured as an multicast border router (MBR).
2. An interface can only be configured with one multicast routing protocol at a time (DVMRP or PIM-SM).
3. Enable DVMRP globally.

To enable DVMRP globally, see Enabling DVMRP globally.