ZyXEL Communications XS3800-28, User Manual, Page: 470 / 789

Chapter 64 DHCP
XS3800-28 User’s Guide
470
64.3.1.1 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.
64.3.1.2 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.
64.4 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.
Figure 362 NETWORKING > DHCP > DHCPv4 Relay > DHCP Option 82 Profile
Table 236 DHCP Relay Agent Information Option Format
Code
(82)
Length
(N)
i1 i2
...
iN
Table 237 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 238 DHCP Relay Agent Remote ID Sub-option Format
SubOpt Code Length Value
2
(1 byte)
N
(1 byte)
MAC Address or String