H3C S3100-52P Operation Manual page 500

Operation Manual – DHCP
H3C S3100-52P Ethernet Switch
Configure a storage
format for the Option
82 field
Note:
The dhcp-snooping information format command applies only to the default content
of the Option 82 field. If you have configured the circuit ID or remote ID sub-option, the
format of the sub-option is ASCII, instead of the one specified with the dhcp-snooping
information format command.
IV. Configuring the circuit ID sub-option
Follow these steps to configure the circuit ID sub-option:
Enter system view
Enter Ethernet port view
Configure the circuit ID
sub-option in Option 82
Note:
If you have configured a circuit ID with the vlan vlan-id argument specified, and the
other one without the argument in Ethernet port view, the former circuit ID applies to
the DHCP messages from the specified VLAN; while the latter one applies to DHCP
messages from other VLANs.
In a port aggregation group, you can use this command to configure the primary and
member ports respectively. When Option 82 is added, however, the circuit ID
sub-option is subject to the one configured on the primary port.
The circuit ID sub-option configured on a port will not be synchronized in the case of
port aggregation.
To do... Use the command...
dhcp-snooping
information format { hex |
ascii }
To do...
system-view
interface interface-type
interface-number
dhcp-snooping
information [ vlan
vlan-id ] circuit-id
string string
Chapter 2 DHCP Snooping Configuration
Use the command...
2-9
Remarks
Optional
By default, the format is hex.
Remarks
—
—
Optional
By default, the circuit ID
sub-option contains the
VLAN ID and port index
related to the port that
receives DHCP request
packets from DHCP clients