Dhcpv4 Option 82 Profile - ZyXEL Communications GS1920v2 Series User Manual

Relay Agent Information can include the System Name of the Switch if you select this option. You can
change the System Name in SYSTEM > General Setup.
The following describes the DHCP relay agent information that the Switch sends to the DHCP server:
Table 178 Relay Agent Information
FIELD LABELS
Slot ID
Port ID
VLAN ID
Information
53.3.1.1 DHCPv4 Relay Agent Information Format
A DHCP Relay Agent Information option has the following format.
Table 179 DHCP Relay Agent Information Option Format
Code
(82)
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.
53.3.1.2 Sub-Option Format
There are two types of sub-option: "Agent Circuit ID Sub-option" and "Agent Remote ID Sub-option".
They have the following formats.
Table 180 DHCP Relay Agent Circuit ID Sub-option Format
SubOpt Code
1
(1 byte)
Table 181 DHCP Relay Agent Remote ID Sub-option Format
SubOpt Code
2
(1 byte)
The 1 in the first field identifies this as an Agent Circuit ID sub-option and two identifies this as an Agent
Remote ID sub-option. The next field specifies the length of the field.

53.4 DHCPv4 Option 82 Profile

Use this screen to view and configure DHCPv4 option 82 profiles. Click NETWORKING > DHCP > DHCPv4
Relay > DHCP Option 82 Profile link to display the screen as shown.
Chapter 53 DHCP
DESCRIPTION
(1 byte) This value is always 0 for stand-alone switches.
(1 byte) This is the port that the DHCP client is connected to.
(2 bytes) This is the VLAN that the port belongs to.
(up to 64 bytes) This optional, read-only field is set according to system name set in
SYSTEM > General Setup.
Length i1
(N)
Length
N Slot ID, Port ID, VLAN ID, System Name or String
(1 byte)
Length
N MAC Address or String
(1 byte)
GS1920v2 Series User's Guide
i2 iN
...
Value
Value
329