What are the precautions for deploying multicast VLAN replication on a ring network

A multicast VLAN is the user VLAN of itself by default, so you do not need to run the multicast user-vlan command.

When configuring multicast VLAN replication on the S1720, S2700, S5700S-LI (except S5700S-28X-LI-AC and S5700S-52X-LI-AC), or S5700LI, pay attention to the following constraints:

-A user-side interface can be added to only one user VLAN. If the interface is added to multiple user VLANs, the user VLAN where multicast entries are generated first takes effect.
-The user-side interface also needs to be added to the multicast VLAN in the same mode as it is added to the user VLAN. For example, if the user-side interface is added to the user VLAN in untagged mode, it must be added to the multicast VLAN in untagged mode.
-To prevent broadcast of unknown multicast packets, enable the switch to drop unknown multicast packets. On the S2700SI or S2700EI, run the multicast drop-unknown command in the system view to enable this function. On the S1720, S2720, S5700S-LI or S5700LI, run the multicast drop-unknown command in the VLAN view to enable this function.

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