When Layer 3 multicast forwarding fails on an S series switch, how can I determine whether the reason is that the TTL value of multicast data packet is 1

All S series switches that support Layer 3 multicast can generate multicast forwarding entries for multicast data packets with the TTL value of 1, but cannot forward such multicast data packets.
Use either of the following methods to check whether the TTL value of multicast data packets is 1:
- Obtain packet headers by capturing incoming multicast packets on the uplink interface. Check whether the TTL value of multicast data packets is 1.
- Run the debugging mfib packet command in the user view to enable debugging of Layer 3 multicast packets, and then run the reset multicast forwarding-table group-address command to delete all multicast forwarding entries. Check whether "TTL=1" is displayed in the debugging information.

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