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To troubleshoot multicast, the following commands are useful:
#diag sniffer packet <interface> 'host <G>' 4 0 a
#get router info multicast table [<G>]
#get router info multicast table-count
If PIM sparse-mode is used:
#get router info multicast pim sparse-mode bsr-info
#get router info multicast pim sparse-mode rp-mapping
#get router info multicast pim sparse-mode neighbour
#get router info multicast pim sparse-mode interface
#get router info multicast pim sparse-mode next-hop
#get router info multicast pim sparse-mode table [<G>]
If PIM dense-mode is used:
#get router info multicast pim dense-mode neighbour
#get router info multicast pim dense-mode interface
#get router info multicast pim dense-mode next-hop
#get router info multicast pim dense-mode table <G>
'diag debug flow' is useless, there is no explicit firewall session created on the Fortigate for the multicast traffic.
Benoit
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