D-Link DES-3028 Product Manual - Page 51
The Implementation of DHCP Information Option 82 in the DES-3028/28P/28G/52/52P switches - des vlan
UPC - 790069305375
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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. 1 6 0 4 1 byte 1 byte 1 byte 1 byte VLAN 2 bytes 6. 7. Module Port 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 1 byte 1 byte 1 byte 1 byte 1. Sub-option type 37 User-defined String 6 bytes