ZyXEL Communications ES-2048 - Manual (Page 37)

ES-2000 Series Switch Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
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8. Now, you need to tell the Switch how you are going to separate the
physical Switch into some logical small Switches. Thus, we click
“Advanced Application” then “VLAN”. On the right screen, check the
boxes to suit your need. In this case, we need to make port 1~4 and
port 9, 10 in a group in order for them to communicate in both ways.
And port 5~10 in another group but these two groups cannot talk with
each others. Here we also logically defined Port 9 and Port 10 as the
uplink ports. Therefore, both groups can pass data to Port 9 and Port
10. In another word, these two ports belong to both of the groups on
the same time. Please confirm if your setting looks similar to below.