edge safeguard
    Loop prevention and
        detection on an edge port configured for RSTP. Configuring edge safeguard on RSTP edge ports
        can prevent accidental or deliberate misconfigurations (loops) resulting from connecting two
        edge ports together or from connecting a hub or other non-STP switch to an edge port. Edge
        safeguard also limits the impact of broadcast storms that might occur on edge ports. This
        advanced loop prevention mechanism improves network resiliency but does not interfere with
        the rapid convergence of edge ports.