ZyXEL Communications ES 3500 Series Troubleshooting Manual page 32

Is the egress rule configured correctly?
The egress rule indicates whether the packet going out the port should be
"tagged" or "untagged". A port should generally be sending out untagged
packets if the port is directly connected to an end station
(PC, laptops, printers, etc.). However, if the port is connected to a neighboring
switch, or a device that has a virtual VLAN interface (IP phones, servers, routers,
etc.), then the port must send tagged packets.
Using Web GUI:
Figure 12
Advance Application > VLAN > Index
*Ports that are sending out tagged packets for this VLAN is labelled "T".
Using CLI:
Figure 13 Enter CLI command "show vlan"
If a port on VLAN configuration is correct, go to <OTHERS>.
If a port on VLAN configuration is not correct, reconfigure and return to step 3.
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