PDF user manual for CopperEdge 150

• A unique circuit identifier is automatically entered in theCircuitID object in the cmDHCPTable. The default is theCE150’s system name plus the DSL PII. You can changeit to a different alphanumeric identifier, but it must startwith an alpha character.• The CircuitID is inserted in the Relay Agent Information(Option 82) and Client Identifier (Option 61) fields in theDHCP request message.1 2 7 (An upstream DHCP server uses Option 82, Relay Agent Information,to identify which DSL port the DHCP request originated on. It usesOption 61, Client Identifier, to distinguish between requestsoriginating from a CPE and requests originating from a host. If Option61 is present, the request originated from a CPE; if it is not present,the request originated from a host.The CE150’s DHCP functionality depends on which netmodel isbeing used and whether the CPE is a CMCP CPE.Summary of the CE150’s DHCP FunctionalityDHCP Function Network Model CMCP CPECE150 as aServerCE150 as a RelayAgentCE150 as a ForwardingAgentHost withCMCP CPENon-CMCP CPEor HostIP Response Relay Response 1CopperVPN Response Forward Response 1VWAN Response Forward Response 1HDIA Response Forward Response 1Cross-Connect Response Forward Response 1IP Relay 2 Relay 3 Relay 3CopperVPN Forward 2 Forward 3 Forward 3VWAN Forward 2 Forward 3 Forward 3HDIA Forward 2 Forward 3 Forward 3Cross-Connect Forward 2 Forward 3 Forward 31. The CE150 cannot distinguish between non-CMCP CPEs and their hosts on the premise LAN. It can only assign oneIP address, which comes from the cmDHCPTable. The CE150 sends that IP address to both the non-CMCP CPEs andtheir hosts. Therefore, configure the CE150 to either Relay or Forward these requests to an upstream DHCP server,which can assign different IP addresses for both.2. Both the Relay Agent Information and Client Identifier are inserted in the request.3. Only the Relay Agent Information is inserted in the request.The following sections describe the CE150’s DHCP functionality,both upstream and downstream.&RSSHU(GJH,QVWDOODWLRQDQG2SHUDWLQJ*XLGH