H3C S5120-EI Series - Page 350

2-8
Configuring the DHCP relay agent to support Option 82
Follow these steps to configure the DHCP relay agent to support Option 82:
To do… Use the command… Remarks
Enter system view
system-view
—
Enter interface view
interface interface-type
interface-number
—
Enable the relay agent to
support Option 82
dhcp relay information
enable
Required
Disabled by default.
Configure the handling strategy
for requesting messages
containing Option 82
dhcp relay information
strategy { drop | keep |
replace }
Optional
replace by default.
Configure the
padding format
for Option 82
dhcp relay information
format { normal | verbose
[ node-identifier { mac |
sysname | user-defined
node-identifier } ] }
Optional
normal by default.
Configure the
code type for the
circuit ID
sub-option
dhcp relay information
circuit-id format-type
{ ascii | hex }
Optional
By default, the code type depends
on the padding format of Option 82.
Each field has its own code type.
The code type configuration
applies to non-user-defined Option
82 only.
Configure
non-user-
defined
Option 82
Configure the
code type for the
remote ID
sub-option
dhcp relay information
remote-id format-type
{ ascii | hex }
Optional
By default, the code type is hex.
This code type configuration
applies to non-user-defined Option
82 only.
Configure the
padding content
for the circuit ID
sub-option
dhcp relay information
circuit-id string circuit-id
Optional
By default, the padding content
depends on the padding format of
Option 82.
Configure
user-defin
ed Option
82
Configure the
padding content
for the remote ID
sub-option
dhcp relay information
remote-id string
{ remote-id | sysname }
Optional
By default, the padding content
depends on the padding format of
Option 82.
z To support Option 82, it is required to perform related configuration on both the DHCP server and
relay agent.
z If the handling strategy of the DHCP relay agent 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.
z If sub-option 1 (node identifier) of Option 82 is padded with the device name (sysname) of a node,
the device name must contain no spaces. Otherwise, the DHCP relay agent will drop the message.