119• Downlink ports are the monitoring ports. The state of the downlink ports in a monitor link groupadapts to that of the monitor link group. When the state of a monitor link group changes, the stateof its member downlink ports change accordingly. The state of the downlink ports in a monitor linkgroup is always consistent with that of the monitor link group.Uplink/DownlinkThe uplink is the link that connects the uplink ports in a monitor link group, and the downlink is the linkthat connects the downlink ports.How Monitor Link worksA monitor link group works independently of other monitor link groups. When a monitor link groupcontains no uplink port or when all its uplink ports are down, the monitor link group goes down andforces all downlink ports down at the same time. When any uplink port goes up, the monitor link groupgoes up and brings up all the downlink ports.H3C does not recommend manually shutting down or bringing up the downlink ports in a monitor linkgroup.Configuring Monitor LinkConfiguration prerequisitesMake sure that the port is not the member port of any aggregation group.Creating a monitor link groupStep Command1. Enter system view. system-view2. Create a monitor link group, and enter monitor linkgroup view. monitor-link group group-idConfiguring monitor link group member portsYou can configure member ports for a monitor link group either in monitor link group view or interfaceview. The configurations made in these two views lead to the same result.You can assign a Layer 2 Ethernet port or Layer 2 aggregate interface to a monitor link group as amember port.A port can be assigned to only one monitor link group.Configure uplink ports prior to downlink ports to avoid undesired down/up state changes on thedownlink ports.In monitor link group viewTo configure member ports for a monitor link group in monitor link group view:
