Graceful Restart: FIP snooping

Enables the system to recover gracefully from Ethernet protocol restarts and crashes. If the Ethernet protocol restarts, the previously existing ENode and host sessions continue to run and are not lost. Existing logged in ENodes, discovered FCoE forwarders (FCFs) and Fibre Channel switches, sessions, and filter states are preserved through the restart. This feature is automatic, and there are no new statements or commands.