R3303-HP HSR6800 Routers Layer 3 - IP Services Configuration Guide

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Figure 18 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 19.
Figure 19 Sub-option 1 in verbose pa
dding 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 Figure 18.
• Pr
ivate padding format:
{ Sub-option 1—Contains the VLAN ID of the interface that received the client's request, module
(slot number of the receiving port) and port (number of the receiving port). The value of the
sub-option type is 1.
Figure 20 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 21 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.