111To do… Use the command… RemarksEnter system view system-view —Enter monitor link group view monitor-link group group-id —Configure member ports for the monitor linkgroupport interface-type interface-number{ uplink | downlink } RequiredIn port viewFollow these steps to configure member ports for a monitor link group in port view:To do… Use the command… RemarksEnter system view system-view —Enter Ethernet port view or Layer 2aggregate port viewinterface interface-typeinterface-number —Configure the current port as a member of amonitor link groupport monitor-link group group-id{ uplink | downlink } RequiredNOTE:• You can assign a Layer 2 Ethernet port or Layer 2 aggregate port to a monitor link group as a memberport.• 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.Displaying and maintaining Monitor LinkTo do… Use the command… RemarksDisplay monitor link groupinformationdisplay monitor-link group { group-id | all } [ |{ begin | exclude | include } regular-expression ] Available in any viewMonitor Link configuration exampleNetwork requirementsAs shown in Figure 28:• Device C is a smart link device, and Device A, Device B, and Device D are associated devices.Traffic of VLANs 1 through 30 on Device C is dual-uplinked to Device A through a smart link group.• Implement dual uplink backup on Device C, and ensure that when the link between Device A andDevice B (or Device D) fails, Device C can sense the link fault and perform uplink switchover in thesmart link group.NOTE:For more information about Smart Link, see the chapter “Smart link configuration.”