PLANET WGSW-52040 - Manual (Page 463)

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58.4 Device Mirror Troubleshooting
If problems occur on configuring port mirroring, please check the following first for causes:
 Whether the mirror destination port is a member of a TRUNK group or not, if yes, modify the TRUNK
group.
 If the throughput of mirror destination port is smaller than the total throughput of mirror source port(s),
the destination port will not be able to duplicate all source port traffic; please decrease the number of
source ports, duplicate traffic for one direction only or choose a port with greater throughput as the
destination port. Mirror destination port can not be pulled into Isolate vlan, or will affect mirror between
VLAN.