ZyXEL Communications IES-1248 Support Notes page 56

IES 1248 Support Notes
Select "option 82 Relay Agent Information", sub-option 1, binary data. For port 25,
VLAN 1, "1248", please key in "0019000131323438" as the key value and click OK.
Please note that the first 2 bytes define port number, the second 2 bytes is VLAN ID
and the other bytes are the Option 82 string.
After you finish above step, you will see the following figure.
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