© Copyright Lenovo 2016 Chapter 38: Layer 2 Failover 607Manually Monitoring Port LinksThe Manual Monitor allows you to configure a set of ports and LAGs to monitorfor link failures (a monitor list), and another set of ports and LAGs to disable whenthe trigger limit is reached (a control list). When the switch detects a link failure onthe monitor list, it automatically disables the items in control list. When serverports are disabled, the corresponding server’s network adapter can detect thedisabled link, and trigger a network‐adapter failover to another port or LAG on theswitch, or another switch.The switch automatically enables the control list items when the monitor list itemsreturn to service.Monitor Port StateA monitor port is considered operational as long as the following conditions aretrue: The port must be in the Link Up state. If STP is enabled, the port must be in the Forwarding state. If the port is part of an LACP LAG, the port must be in the Aggregated state.If any of these conditions is false, the monitor port is considered to have failed.Control Port StateA control port is considered Operational if the monitor trigger is up. As long as thetrigger is up, the port is considered operational from a teaming perspective, even ifthe port itself is actually in the Down state, Blocking state (if STP is enabled on theport), or Not Aggregated state (if part of an LACP LAG).A control port is considered to have failed only if the monitor trigger is in the Downstate.To view the state of any port, use one of the following commands:>> # show interface link (View port link status)>> # show interface port spanning tree stp (View port STP status)>> # show lacp information (View port LACP status)
