Configuration Procedure - HP 10500 Series Configuration Manual

If the handling strategy of the DHCP-snooping device is configured as replace, configure a padding
•
format for Option 82. If the handling strategy is keep or drop, you need not configure any padding
format.
If Option 82 contains the device name, the device name must contain no spaces. Otherwise, the
•
DHCP-snooping device drops the message. Use the sysname command to specify the device name.
For more information about this command, see Fundamentals Command Reference.
• If DHCP snooping and QinQ work together or the DHCP snooping device receives a DHCP packet
with two VLAN tags, and the normal or verbose padding format is adopted for Option 82, DHCP
snooping fills the VLAN ID field of sub-option 1 with outer VLAN tag.inter VLAN tag. For example,
if the outer VLAN tag is 10 (a in hexadecimal) and the inner VLAN tag is 20 (14 in hexadecimal),
the VLAN ID is 000a.0014.

Configuration procedure

To configure DHCP snooping to support Option 82:
Step
1. Enter system view.
2. Enter interface view.
3. Enable DHCP snooping to
support Option 82.
4. Configure the handling
strategy
containing Option 82.
Command
system-view
interface interface-type
interface-number
dhcp-snooping information enable
dhcp-snooping information strategy
for requests
{ drop | keep | replace }
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Remarks
N/A
N/A
Disabled by default.
Optional.
replace by default.