ZyXEL GS1920 Series User Guide - Page 284
DHCPv4 Option 82 Profile
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Chapter 35 DHCP 35.4.1.1 DHCPv4 Relay Agent Information Format A DHCP Relay Agent Information option has the following format. Table 138 DHCP Relay Agent Information Option Format Code Length i1 i2 iN (82) (N) ... i1, i2 and iN are DHCP relay agent sub-options, which contain additional information about the DHCP client. You need to define at least one sub-option. 35.4.1.2 Sub-Option Format There are two types of sub-option: "Agent Circuit ID Sub-option" and "Agent Remote ID Suboption". They have the following formats. Table 139 DHCP Relay Agent Circuit ID Sub-option Format SubOpt Code Length Value 1 N Slot ID, Port ID, VLAN ID, System Name or String (1 byte) (1 byte) Table 140 DHCP Relay Agent Remote ID Sub-option Format SubOpt Code Length Value 2 N MAC Address or String (1 byte) (1 byte) The 1 in the first field identifies this as an Agent Circuit ID sub-option and 2 identifies this as an Agent Remote ID sub-option. The next field specifies the length of the field. 35.4.2 DHCPv4 Option 82 Profile Use this screen to create DHCPv4 option 82 profiles. Click IP Application > DHCP > DHCPv4 in the navigation panel and click the Option 82 Profile link to display the screen as shown. GS1920 Series User's Guide 284