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The smbutil command also has arguments for observing SMB3 multichannel operation. These commands can be used to verify that SMB multichannel is functional and that the appropriate NICs are involved in the multiple connections. Here is a sample command:
smbutil multichannel -m /path/to/network/share
The following is an example partial output. Notice that macOS is misreporting the speed of the links (they are 25GbE). This incorrect report does not impact the real network speed.