Untagged mirrored packets

Although a VLAN tag is added (by default) to the mirrored copy of untagged outbound packets to indicate the source VLAN of the packet, it is sometimes desirable to have mirrored packets look exactly like the original packet. The no-tag-added parameter gives you the option of not tagging mirrored copies of outbound packets, as shown in Mirroring commands with the no-tag-added option and Displaying a mirror session configuration with the no-tag-added option .

Mirroring commands with the no-tag-added option
Displaying a mirror session configuration with the no-tag-added option