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6.4.11 DHCP Relay Agent Option 82
DHCP Relay function will control DHCP requests and forward DHCP requests to
the assigned DHCP server. DHCP Relay Agent Option 82 function will add
connection port, VLAN ID and switch information to DHCP requests and then
send to the specified DHCP server. Based on those information, DHCP server
will assign an IP configuration in the DHCP reply. This is a security function.
This page is used to configure DHCP Relay Option 82 function. DHCP Relay
Option 82 function will add the following information to DHCP request packet ...
1. Port number that DHCP request packet comes from
2. VLAN ID for this DHCP request
3. Mac address of the switch
4. A additional string as information. (*Adding the information string must be
enabled first.)
And DHCP server will assign IP configuration according to the information in
Option 82.
Note
: Not every DHCP server supports Option 82 function. If DHCP server does
not support it, please disable this DHCP-Relay Agent Option 82 function.
Here is the Option 82 definition of the switch.
1. Circuit ID sub-option setup information for DHCP server :
<Format>
[Slot ID/1-Byte] [Port ID/1-Byte] [VLAN ID/2-Bytes] [Information/X- Bytes]
Slot ID - plase set to “0”.
Port ID - please set according to the port number of the switch.
VLAN ID - please set according to its VLAN ID.
Information - this is a string with variable length
For example, “000500c8” means Slot ID 0, Port 5, VLAN ID 200, no
information. All of the numbers are hexadecimal numbers.
2. Remote ID sub-option setup information for DHCP server :
<Format>
[Mac Address/6-Bytes]
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