Technical Tip: Restore multicast traffic after a failover
| Description | This article describes how to fix the multicast traffic after a failover. |
| Scope | FortiGate before v7.2.x |
| Solution | 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 |