The 7210 SAS-K 2F6C4T and 7210 SAS-K 3SFP+ 8C supports local DHCP server functionality on the base router and on access IP interfaces associated with VPRN, by dynamically assigning IPv4 addresses to access devices that request them. This standards-based, full DHCP server implementation allows a service provider the option. The 7210 SAS can support public and private addressing in the same router, including overlapped private addressing in the form of VPRNs in the same router. The 7210 SAS-K 2F6C4T and 7210 SAS-K 3SFP+ 8C acts as a DHCP server.
An administrator creates pools of addresses that are available for assigned hosts. Locally attached hosts can obtain an address directly from the server. Routed hosts receive addresses through a relay point in the customer's network. When a DHCP server receives a DHCP message from a DHCP Relay agent, the server looks for a subnet to use for assigning an IP address. If configured with the use-pool-from-client command, the server searches Option 82 information for a pool name. If a pool name is found, an available address from any subnet of the pool is offered to the client. If configured with the use-gi-address command, the server uses the gateway IP address (GIADDR) supplied by the Relay agent to find a matching subnet. If a subnet is found, an address from the subnet is offered to the client. If no pool or subnet is found, then no IP address is offered to the client.
IPv4 address assignments are temporary and expire when the configured lease time is up. The server can reassign addresses after the lease expires.
If both the no use-pool-from-client command and the no use-gi-address command or no use-link-address command are specified, the server does not act.