Network-based DHCP server recovery

摘要

To recover existing IP configuration information directly from an existing network in response to DHCP server failure, unique identifiers corresponding to hosts that a DHCP server provisioned with IP configuration information may be stored on the network in non-volatile memory such that current configuration information associated with the hosts may be obtained from the network in response to the DHCP server failure. For example, in a standalone deployment, messages may be sent to each host, which may respond with the current configuration information. In other scenarios, a summary node may provide summarized configuration information and messages may only be sent to hosts not included among the summarized configuration information, or configuration information may be synchronized among redundant DHCP servers such that messages may be sent to certain hosts based on differences between the configuration information on a mate DHCP server and a DHCP server recovering from failure.

主权项

1. A method for providing network-based Dynamic Host Configuration Protocol (DHCP) server recovery, comprising:
storing unique identifiers that correspond to one or more hosts in a network that a DHCP server has provisioned with Internet Protocol (IP) configuration information in non-volatile memory, wherein the unique identifiers uniquely identify the one or more hosts in a routing domain associated with an Open Shortest Path First (OSPF) area, a routing IP address, a subnet mask, and a gateway, wherein the DHCP server provisions the IP configuration information to the one or more hosts in a standalone deployment; obtaining, from the network, DHCP configuration information currently present on the one or more hosts that correspond to the unique identifiers stored in the non-volatile memory in response to the DHCP server failing; repopulating a DHCP database associated with the DHCP server based on the DHCP configuration information currently present on the one or more hosts; sending a configuration query message to each host that corresponds to a unique identifier stored in the non-volatile memory; and receiving a response to the configuration query message from at least one host that corresponds to a unique identifier stored in the non-volatile memory, wherein the response to the configuration query message includes the DHCP configuration information currently present on the at least one host.