H3C S5120-SI Series Configuration Manual page 51

To do...
6. Configure user-
defined Option 82
You can enable DHCP snooping to support Option 82 on Layer 2 Ethernet interfaces and Layer 2 aggregation
•
interfaces only.
If a Layer 2 Ethernet interface is added to an aggregation group, enabling DHCP snooping to support Option
•
82 on the interface will not take effect. After the interface quits the aggregation group, the configuration will be
effective.
If the handling strategy of the DHCP-snooping-enabled device is configured as replace, you need to configure
•
a padding format for Option 82. If the handling strategy is keep or drop, you need not configure any
padding format.
If the Option 82 is padded with the device name (sysname) of a node, the device name must contain no spaces.
•
If the device name contains space, the DHCP-snooping-enabled device will drop the message.
Use the command...
Configure the code dhcp-snooping
type for the circuit information circuit-id
ID sub-option format-type { ascii | hex }
dhcp-snooping
Configure the code
type for the remote information remote-id
ID sub-option format-type { ascii | hex }
Configure the
dhcp-snooping
padding content for
information [ vlan vlan-id ]
the circuit ID sub-
circuit-id string circuit-id
option
Configure the dhcp-snooping
information [ vlan vlan-id ]
padding content for
the remote ID sub- remote-id string { remote-id
option | sysname }
51
Remarks
Optional
By default, the code type
depends on the padding
format of Option 82. Each
field has its own code type.
This code type configuration
applies to non-user-defined
Option 82 only.
Optional
hex by default.
The code type configuration
applies to non-user-defined
Option 82 only.
Optional
By default, the padding
content depends on the
padding format of Option
82.
Optional
By default, the padding
content depends on the
padding format of Option
82.