3com S7906E Instruccion De Instalación

 

1-7 

Figure 1-8 Sub-option 1 in normal padding format 

 

 

z 

Sub-option 2: Padded with the MAC address of the DHCP relay agent interface or the MAC 

address of the DHCP snooping device that received the client’s request. The following figure gives 

its format. The value of the sub-option type is 2, and that of the remote ID type is 0. 

Figure 1-9 Sub-option 2 in normal padding format 

 

 

2)  Verbose padding format 

The padding contents for sub-options in the verbose padding format are as follows: 

z 

Sub-option 1: Padded with the user-specified access node identifier (ID of the device that adds 

Option 82 in DHCP messages), and the type, number, and VLAN ID of the interface that received 

the client’s request. Its format is shown in 

. 

Figure 1-10 Sub-option 1 in verbose padding format 

 

 

, except that the VLAN ID field has a fixed length of 2 bytes, all the other padding contents 

of sub-option 1 are length variable.  

 

z 

Sub-option 2: Padded with the MAC address of the DHCP relay agent interface or the MAC 

address of the DHCP snooping device that received the client’s request. It has the same format as 

that in normal padding format, as shown in 

.  

Option 184 is a reserved option, and parameters in the option can be defined as needed. The device 

supports Option 184 carrying the voice related parameters, so a DHCP client with voice functions can 

get an IP address along with specified voice parameters from the DHCP server. 

Option 184 involves the following sub-options: