PLANET XGS3-24042 - Manual (Page 227)

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Port Mode.
Default:
Do not drop the packets when checking vlan-translation is failing.
Usage Guide:
When performing the mapping translation between the original and the current VID, if no
corresponding translation is configured, the packet will not be dropped by default, but checking
failure will drop the tag message after use this command, this command is of no effect for untag
message.
Example:
Set ingress packet dropped on port1 when translation failure.
Switch(Config-If-Ethernet1/0/1)#vlan-translation miss drop in