3com WX3000 User Manual

 

3-8 

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. 

 

 Follow these steps to configure the circuit ID sub-option: 

Enter system view 

system-view 

— 

Enter Ethernet port view 

interface interface-type 
interface-number 

— 

Configure the circuit ID 
sub-option in Option 82 

dhcp-snooping information 
[ vlan vlan-id ] circuit-id string 
string 

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 

 

z 

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. 

z 

The circuit ID sub-option configured on a port will not be synchronized in the case of port 

aggregation. 

 

You can configure the remote ID sub-option in system view or Ethernet port view: 

z 

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. 

z 

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: