DES-3028 DES-3028P DES-3052 DES-3052P Layer 2 Fast Ethernet Managed Switch
The Implementation of DHCP Information Option 82 in the DES-3028/28P/52/52P
switches
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- 7. 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 BOOTP Relay Table at the bottom of the following
window, once the user clicks the Add button under the Apply heading. The user may add up to four server IPs per IP interface on
the Switch. Entries may be deleted by clicking it’s corresponding
. To enable and configure DHCP/BOOTP Relay Global
Settings on the Switch, click Configuration > Layer 3 Networking > DHCP/BOOTP Relay > DHCP/BOOTP Relay
Interface Settings:
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