Tag-based:
Tag-based VLAN identifies its member by VID. This is quite different from port-based VLAN. If there are any more rules in ingress filtering list or egress filtering list, the packet will be screened with more filtering criteria to determine if it can be forwarded. The switch supports supplement of 802.1q. For more details, please see the section VLAN in Chapter 3.
Each tag-based VLAN you built up must be assigned VLAN name and VLAN ID. Valid VLAN ID is 1-4094. User can create total up to 24 Tag VLAN groups.
Double-tag:
Double-tag mode belongs to the tag-based mode, however, it would treat all frames as the untagged ones, which means that 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 ones.
Metro Mode:
The Metro Mode is a quick configuration VLAN environment method on Port-based VLAN. It will create 21, 22, 23 or 24 Port- based VLAN groups.
Fig. 4-5 Select VLAN Mode
Fig. 4-6 Metro mode
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