PLANET WGSW-52040 - Manual (Page 479)

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61.4 ERSPAN Troubleshooting
If problems occur when configuring ERSPAN, please check whether the problem is caused by the following
reasons:
 Make sure GRE tunnel configuration to ensure the normal transmission for the traffic.
 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 the traffic of all source port; please decrease the number
of source ports, duplicate traffic for one direction only or choose a port with greater throughput as the
destination port.