Select a Cisco ASR 9001 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 locate cpwVcTimeElapsed under the cpwVcEntry branch of CISCO-IETF-PW-MIB, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. It reports how many seconds have elapsed in the pseudowire's current 15-minute performance-measurement interval. 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 value is stuck at the same number across repeated polls — since it normally cycles from 1 to 900 every 15 minutes by design, a stalled value indicates the pseudowire has stopped collecting statistics. Click Finish to create the monitor; you can adjust any parameter later.