hitless
        failover
    In the Extreme Networks
        implementation on modular switches and SummitStacks, hitless failover means that designated
        configurations survive a change of primacy between the two 
MSM (Master Switch Fabric Module)s
        (modular switches) or master/backup nodes (SummitStacks) with all details intact. Thus,
        those features run seamlessly during and after control of the system changes from one MSM or
        node to another.