H3C S3100 Series Operation Manual page 542

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.
Configure the remote ID sub-option
You can configure the remote ID sub-option in system view or Ethernet port view:
In system view, the remote ID takes effect on all interfaces. You can configure Option 82 as the
system name (sysname) of the device or any customized character string in the ASCII format.
In Ethernet port view, the remote ID takes effect only on the current interface. You can configure
Option 82 as any customized character string in the ASCII format for different VLANs. That is to say,
you can add different configuration rules for packets from different VLANs.
Follow these steps to configure the remote ID sub-option in Option 82:
Operation
Enter system view
Configure the remote ID
sub-option in system view
Enter Ethernet port view
Configure the remote ID
sub-option in Ethernet port view
Command
system-view
dhcp-snooping information
remote-id { sysname | string
string }
interface interface-type
interface-number
dhcp-snooping information
[ vlan vlan-id ] remote-id
string string
3-10
Description
—
Optional
By default, the remote ID
sub-option is the MAC address
of the DHCP snooping device
that received the DHCP client's
request.
—
Optional
By default, the remote ID
sub-option is the MAC address
of the DHCP snooping device
that received the client's
request.