Signamax 065-7840 24-Port 10/100/1000BaseT/TX Managed Switch
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Metro Mode:
The Metro Mode is a quick configuration VLAN environment
method of Port-based VLAN. It will create 22 or 23 Port-based
VLAN groups.
Double-tag:
Double-tag mode belongs functionally to the tag-based mode;
however, it would treat all frames as untagged, which means that a
tag with PVID will be added into all packets. Then, these packets
will be forwarded as Tag-based VLAN. So, the incoming packets
with tag will become the double-tag packets.
Fig. 3-25