HP 6125G Configuration Manual page 39

Figure 22 Sub-option 2 in normal padding format
Verbose padding format
•
Sub-option 1—Contains the user-specified access node identifier (ID of the device that adds
Option 82 in DHCP messages), and the type, number, and VLAN ID of the interface that
received the client's request. The VLAN ID field has a fixed length of 2 bytes. All the other
padding contents of sub-option 1 are length variable. See
Figure 23 Sub-option 1 in verbose padding format
Sub-option 2—Contains the MAC address of the DHCP relay agent interface or the MAC
address of the DHCP snooping device that received the client's request. It has the same format
as that in normal padding format. See
Private padding format
•
Sub-option 1—Contains the VLAN ID of the interface that received the client's request, module
(subcard number of the receiving port) and port (port number of the receiving port). The value
of the sub-option type is 1.
Figure 24 Sub-option 1 in private padding format
Sub-option 2—Contains the MAC address of the DHCP snooping device that received the
client's request. The value of the sub-option type is 2.
Figure 25 Sub-option 2 in private padding format
Sub-option 9—Contains the Sysname and the primary IP address of the Loopback0 interface.
The value of the sub-option type is 9.
Figure 22.
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Figure 23.