The pim dm command enables PIM-DM on an interface.
The undo pim dm command restores the default configuration.
By default, PIM-DM is disabled on an interface.
After PIM-DM is enabled on an interface of the VPN instance on a FW, the interface or other interfaces of the VPN instance cannot be enabled with PIM-SM. The instance on a FW cannot be enabled with PIM-DM and PIM-SM simultaneously.
You must run the multicast routing-enable command to enable the multicast function before using the command.