LevelOne GSW-0890 Benutzerhandbuch

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Metro Mode:  
The Metro Mode is a quick configuration VLAN environment 
method on Port-based VLAN. It will create 6 or 7 Port-based 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. 
 
 
Fig. 3-28