H3C S3100 Series Operation Manual page 541

If a handling policy is configured on a port, this configuration overrides the globally configured handling
policy for requests received on this port, while the globally configured handling policy applies on those
ports where a handling policy is not natively configured.
Configure the storage format of Option 82
S3100-EI Series Ethernet Switches support the HEX or ASCII format for the Option 82 field.
Follow these steps to configure a storage format for the Option 82 field:
Operation
Enter system view
Configure a storage format for
the Option 82 field
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.
Configure the circuit ID sub-option
Follow these steps to configure the circuit ID sub-option:
Operation
Enter system view
Enter Ethernet port view
Configure the circuit ID
sub-option in Option 82
Command
system-view
dhcp-snooping information
format { hex | ascii }
Command
system-view
interface interface-type
interface-number
dhcp-snooping information
[ vlan vlan-id ] circuit-id string
string
3-9
Description
—
Optional
By default, the format is hex.
Description
—
—
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