HP 3600 v2 Series Configuration Manual page 90

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.
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
for requests
containing Option
82.
5. Configure Option
82 in the
non-user-defined
padding format.
Command
system-view
interface interface-type
interface-number
dhcp-snooping information enable
dhcp-snooping information strategy
{ append | drop | keep | replace }
•
Configure the padding format for
Option 82:
dhcp-snooping information format
{ normal | private private |
standard | verbose [ node-identifier
{ mac | sysname | user-defined
node-identifier } ] }
•
Configure the code type for the
circuit ID sub-option:
dhcp-snooping information
circuit-id format-type { ascii | hex }
•
Configure the code type for the
remote ID sub-option:
dhcp-snooping information
remote-id format-type { ascii | hex }
•
Enable sub-option 9:
dhcp-snooping information [ vlan
vlan-id ] sub-option sub-option-code
79
Remarks
N/A
N/A
Disabled by default.
Optional.
replace by default.
Optional.
By default:
•
The padding format for Option 82 is
normal.
•
The code type for the circuit ID
sub-option depends on the padding
format of Option 82. Each field has its
own code type.
•
The code type for the remote ID
sub-option is hex.
•
Sub-option 9 is not enabled
Hex configuration applies to private
padding format only.
The code type configuration for the
circuit ID sub-option and remote ID
sub-option apply to non-user-defined
Option 82 only.
For sub-option 9, when append strategy
is adopted, the sysname and the primary
IP address of the Loopback0 interface
are padded. When some other strategy
is adopted, only the sysname is padded.