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After an FGCP HA failover, it is possible that some multicast streams in an environment will not recover natively.
In this case, the PIM group table is only populated with (*,G) group entries even if the source should be known and the FortiGate is the First Hop Router.
This command will display the multicast groups:
get router info multicast pim sparse-mode table
If the multicast streams are not OK after the failover and many (*,G) entries are listed from the previous command, use the following command (VDOM level) to restore the traffic:
diagnose ip multicast mfc-flush
This will flush all multicast routes:
This command should be run during a maintenance window to avoid any disturbance for the current traffic.
Related articles:
Troubleshooting Tip: IGMP and PIM commands and debug in Sparse-Mode
Technical Tip: How to receive a multicast stream in a PIM sparse mode network topology
Troubleshooting Tip: Troubleshooting issues with multicast routing when using PIM in Sparse-Mode
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