HP 10500 Series Configuration Manual page 43
Layer 3 - ip services
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Also See for 10500 Series:
- Security configuration manual (596 pages) ,
- Configuration manual (512 pages) ,
- Specifications (42 pages)
Table of Contents
Figure 22 PXE server address sub-option value field
Relay agent option (Option 82)
Option 82 is the relay agent option in the option field of the DHCP message. It records the location
information of the DHCP client. When a DHCP relay agent or DHCP snooping device receives a client's
request, it adds Option 82 to the request message and sends it to the server.
The administrator can use Option 82 to locate the DHCP client and further implement security control
and accounting. The DHCP server can use Option 82 to provide individual configuration policies for the
clients.
Option 82 can contain up to 255 sub-options and must have one sub-option at least. Option 82 supports
two sub-options: sub-option 1 (Circuit ID) and sub-option 2 (Remote ID).
Option 82 has no standard definition. Its padding formats vary with vendors.
There are two methods for configuring Option 82:
User-defined method—Manually specify the content of Option 82.
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Non-user-defined method—Pad Option 82 in the default normal format or verbose format.
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If you choose normal or verbose format, specify the code type for the sub-options as ASCII or HEX.
Normal padding format
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Sub-option 1—Contains the VLAN ID and interface number of the interface that received the
client's request. The value of the sub-option type is 1, and that of the circuit ID type is 0.
Figure 23 Sub-option 1 in normal 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. The value of the
sub-option type is 2, and that of the remote ID type is 0.
Figure 24 Sub-option 2 in normal padding format
Verbose padding format
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Troubleshooting
