Select a switch or router supporting IEEE 802.3ad/802.1AX (LACP) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type dot3adAggDataRate into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. It reports the current combined data rate of this link aggregation group, in bits per second (the sum of each member link's rate). On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is an Integer32-type OID, Value bounds is the most useful condition here — trigger an alert if the rate drops below the value expected for this bundle's configured member links, since a lower-than-expected rate indicates one or more links in the bundle are down. Click Finish to create the monitor; you can adjust any parameter later.