If PIM neighbor check is enabled, a device checks whether the Join/Prune and Assert messages are sent to or received from PIM neighbors. If not, the device drops the messages.
By default, checking whether the Join/Prune message and Assert messages are sent to or received from a PIM neighbor is not enabled.
If PIM neighbor checking is required, it is recommended that you configure the neighbor checking function on the devices connected to user devices rather than on the internal devices of the network. Then, the FW checks whether the Join/Prune and Assert messages are sent to or received from a PIM neighbor. If not, the FW drops the messages.
Do as follows on the FW enabled with PIM-SM:
pim [ vpn-instance vpn-instance-name ]
neighbor-check { receive | send }
You can specify both receive and send to enable the PIM neighbor check function for the received and sent Join/Prune and Assert messages.