Local DHCP servers provide a standards-based full DHCP server implementation which allows a service provider the option of decentralizing the IP address management into the network. Local DHCP servers are supported on 7750 SR-7, and 7750 SR-12 models. The 7450 ESS routers use DHCP relay and proxy DHCP server functionality.
Three applications are targeted for the local DHCP server:
subscriber aggregation in either a single node (routed CO) or TPSDA
business services
A server can be defined in a VPRN service and associated with different interfaces. Locally attached hosts can get an address directly from the servers. Routed hosts receives addresses through a relay point in the customer’s network. This option is supported for the 7750 SR only.
PPP clients
Either in a single node or a separate PPPoE server node and a second DHCP server node. The PPPoE server node may be configured to query the DHCP server node for an address and options to provide to the PPPoE client. The PPPoE server provides the information in PPP format to the client.
DHCP server scenarios include:
DHCP servers can be integrated with Enhanced Subscriber Management (ESM) for DHCP clients, DHCP relays and PPPoE clients.
A stand-alone DHCP server can support DHCP clients and DHCP relays.
IPv4 is supported. DHCP servers provide increased management over the IPv4 address space across its subscriber base, with support for public and private addressing in the same router, including overlapped private addressing in the form of VPRNs in the same SR-series router.
DHCP servers are configurable and can be used in the bridged CO, routed CO, VPRN wholesaler, and dual-homing models.