D-Link xStack DGS-3200-10 - Page 36

xStack
®
DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch
23
Implementation of DHCP Relay Agent Information Option 82
The config dhcp_relay opti on_82 command configures the DHCP relay ag ent 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 the DHCP client packet, the 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 2 - 19. Circuit ID and Remote ID Sub-option Format