ZyXEL Communications GS1920-24v2 - Dhcpv4 Option 82 Profile

Chapter 53 DHCP
GS1920v2 Series User’s Guide
329
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:
53.3.1.1 DHCPv4 Relay Agent Information Format
A DHCP Relay Agent Information option has the following format.
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.
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.
Table 178 Relay Agent Information
FIELD LABELS DESCRIPTION
Slot ID (1 byte) This value is always 0 for stand-alone switches.
Port ID (1 byte) This is the port that the DHCP client is connected to.
VLAN ID (2 bytes) This is the VLAN that the port belongs to.
Information (up to 64 bytes) This optional, read-only field is set according to system name set in
SYSTEM > General Setup.
Table 179 DHCP Relay Agent Information Option Format
Code
(82)
Length
(N)
i1 i2
...
iN
Table 180 DHCP Relay Agent Circuit ID Sub-option Format
SubOpt Code Length Value
1
(1 byte)
N
(1 byte)
Slot ID, Port ID, VLAN ID, System Name or String
Table 181 DHCP Relay Agent Remote ID Sub-option Format
SubOpt Code Length Value
2
(1 byte)
N
(1 byte)
MAC Address or String