Hi Richard
- General mode allows multiple untagged vlans and also multiple tagged vlans to exist on the same switch interface. I have never used this mode personally.
- Trunk mode allows ONE untagged vlan and multiple Tagged vlans to exist on the same switch interface.
- Access mode allows only one untagged vlan to exist on a switch interface.
I find the default setting of trunk mode the most useful , and therefore leave this setting alone.
It allows any port to be untagged in one vlan and if needed tagged in many vlans, so this interface setting can be used for PC that are not vlan aware or Uplinks to other switches.
You will notice at the top right corner of the configuration GUI, a help option. This option brings up a window giving help on the GUI page you have in front of you.
Hope that answered your question.
regards Dave