Draytek vigor3900 User Manual page 61

3. Type VLAN name and VID with 111.
4. Create the rest VLAN Groups (total is 24) by referring to the following figure. Please
notice that Port 26 must be selected as the member for each group, for it is the channel
for any packets coming from Vigor3900. As to Untag, when you check Port 2 and Port
26, you have to untag Port 2; when you check Port 3 and Port 26, you have to untag
Port 3; and so forth.
Vigor3900 Series User's Guide
Suppose the physical WAN1 of Vigor3900 connects to Port 26 of VigorSwitch.
Port 26 will receive untagged packets (based on profile wan1) and packets tagged
with 111 to 134 (based on profiles wan1_1 to wan1_24). Therefore VigorSwitch
Port 26 must be the member of VLAN Group ID 111 to 134.
In Member field, select Port 1 and Port 26 as members of VLAN Group 111.
Member setting means only the selected port number (e.g., Port 1 and Port 26)
will receive packets with VLAN TAG 111 coming from Vigor3900.
In Untag field, select Port 1 as Untag. Untag setting means VigorSwitch will
untag the packets while sending it to Port 1. Because general PC or normal
network devices do not accept VLAN packets, therefore in this example,
Vigor3900 WAN1 must be connected to VigorSwitch Port 26 for receiving
packets with tagged VLAN ID.
Since ISP modem usually doesn't accept tagged packets, we have to set Untag for
the Port (e.g, Port 1) used for ISP modem. Connect ISP modem for wan1_1 to
VigorSwitch Port 1.
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