Allied Telesis AT-S39 - Manual (Page 122)

Chapter 13: VLAN Commands
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The following command does the same thing using Syntax 2:
delete vlan name=production untaggedports=3
To delete both tagged and untagged ports from a VLAN using Syntax 1
takes two commands. For example, if you had a VLAN called Service and
you wanted to delete tagged Port 5 and untagged Ports 10 to 12, the
commands would be:
delete vlan name=Service ports=5 frame=tagged
delete vlan name=Service ports=10-12
frame=untagged
Using Syntax 2, you can do the whole thing with just one command:
delete vlan name=Service untaggedports=10-12
taggedports=5