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DES-3010F/DES-3010FL/DES-3010G/DES-3016/DES-3018/DES-3026 Fast Ethernet Switch Manual
80
The Implementation of DHCP Information Option 82 on the Switch.
The config dhcp_relay option_82 command configures the DHCP relay agent information option 82 setting
of the switch. The formats for the circuit ID sub-option and the remote ID sub-option are as follows:
NOTE: For the circuit ID sub-option of a standalone switch, the module field is
always zero.
Circuit ID sub-option format:
1. 2. 3. 4. 5. 6. 7.
1 6 0 4 VLAN Module Port
1 byte 1 byte 1 byte 1 byte 2 bytes 1 byte 1 byte
a. Sub-option type
b. Length
c. Circuit ID type
d. Length
e. VLAN : the incoming VLAN ID of DHCP client packet.
f. Module : For a standalone switch, the Module is always 0; For a stackable switch, the
Module is the Unit ID.
g. Port : The incoming port number of DHCP client packet, port number starts from 1.
Remote ID sub-option format:
1. 2. 3. 4. 5.
2 8 0 6 MAC address
1 byte 1 byte 1 byte 1 byte 6 bytes
1. Sub-option type
2. Length
3. Remote ID type
4. Length
5. MAC address: The Switch’s system MAC address.
Figure 6- 63. Circuit ID and Remote ID Sub-option Format
DHCP/BOOTP Relay Interface Settings
This window allows the user to set up a server, by IP address, for relaying DHCP/ BOOTP information to
the Switch. The user may enter a previously configured IP interface on the Switch that will be connected
directly to the DHCP/BOOTP server using the following window. Properly configured settings will be
displayed in the DHCP/BOOTP Relay Interface Table at the bottom of the following window. The user
may add up to four server IP’s per IP interface on the Switch. To enable and configure DHCP/BOOTP
Relay Global Settings on the Switch, click Administration > DHCP/BOOTP Relay > DHCP/BOOTP
Relay Interface Settings