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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 with a VLAN
name and a 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 the same way as Tag-based VLAN. So, the incoming
packets with tags 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