DES-3028 DES-3028P DES-3028G DES-3052 DES-3052P Layer 2 Fast Ethernet Managed Switch
The Implementation of DHCP Information Option 82 in the DES-3028/28P/28G/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
1. Sub-option type
2. Length
3. Circuit ID type
4. Length
5. VLAN : the incoming VLAN ID of DHCP client packet.
6. Module : For a standalone switch, the Module is always 0; For a stackable switch, the Module is the Unit ID.
7. Port : The incoming port number of DHCP client packet, port number starts from 1.
Remote ID sub-option format 1:
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 1
Remote ID sub-option format 2:
1. 2. 3. 4. 5.
2 n+2 1 n User-defined String
1 byte 1 byte 1 byte 1 byte 6 bytes
1. Sub-option type
37
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