A VLAN trunk port can be mirrored, but cannot act as a mirror port itself.
The Switching > Port Mirroring page allows you to assign mirror ports to mirror ingress, egress or bidirectional packets coming from a group of ports.
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In the Edit Mirror Group dialog, type a descriptive name for the group into the Interface Group Name field.
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For the Direction, select one of the following:
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ingress – To monitor traffic arriving on the mirrored port(s).
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egress – To monitor traffic being sent out on the mirrored port(s).
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both – To monitor traffic in both directions on the mirrored port(s).
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To enable port mirroring for these ports, select the Enable checkbox.
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In the All Interfaces list, select the port to mirror the traffic to and click the top right-arrow button to move it to the Mirror Port field. You must use an unassigned port as the mirror port.
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In the All Interfaces list, select one or more ports to be monitored, and click the lower right-arrow button to move it/them to the Mirrored Ports field. You will be able to monitor traffic on the mirrored port(s) by connecting to the mirror port.
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Click OK.
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On the Switching > Port Mirroring page, select the checkbox next to the port mirroring group that you want to delete.
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Click the Ungroup button.
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Click OK in the confirmation dialog box.
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