Interlogix NS3500-28T-4S User Manual - Manual (Page 265)

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The definition of Circuit ID in the switch is 4 bytes in length and the format is "vlan_id" "module_id" "port_no". The
parameter of "vlan_id" is the first two bytes represent the VLAN ID. The parameter of "module_id" is the third byte for
the module ID (in standalone switch it always equal 0, in switch it means switch ID). The parameter of "port_no" is the
fourth byte and it means the port number.
After enabling DHCP snooping, the switch will monitor all the DHCP messages and implement software transmission.
The DHCP Rate Limit Setting and Config screens in Figure 4-9-44 & Figure 4-9-45 appear.
Figure 4-9-44 Option82 Global Setting Page Screenshot
The page includes the following fields:
Object Description
 State Set the option2 (remote ID option) content of option 82 added by DHCP request
packets.

Default means the default VLAN MAC format.

User-Define means the remote-id content of option 82 specified by users
Buttons
: Click to apply changes.
Figure 4-9-45 Option82 Global Setting Page Screenshot