Link monitoring

To configure link monitoring:

1. Configure the link monitoring in one of the following ways:
   • In the menu, go to the SD-WAN → CPE section, click the device, and in the displayed settings area, select the Tunnels tab and click Management → Set thresholds next to the link. Only links established from the CPE device are displayed on that device.
   • In the menu, go to the Infrastructure section, click Management →Configuration menu next to the controller deployed for the instance, in the menu that is displayed, go to the Tunnels section and click Management → Set thresholds next to the link.
   • In the menu, go to the Infrastructure section, click Management →Configuration menu next to the controller deployed for the instance, in the menu that is displayed, go to the Topology section and in the displayed window, click Set thresholds.
2. Select the Enable tunnel thresholds monitoring check box enable link monitoring.
3. If you enabled link monitoring, configure the monitoring thresholds:
   1. To set default monitoring thresholds, click Set to default.
   2. If you want to use the link as the last resort option when routing traffic regardless of the link quality, select the Unsolicited check box. This check box is cleared by default.
   3. In the Interval for processing errors and utilization rate (sec.) field, enter the interval in seconds for measuring the number of errors on the link and its level of utilization. Range of values: 1 to 300. The default setting is 60.
   4. If you want to specify a threshold for the number of errors per second on the link, select the Enable error monitoring check box and in the Critical error level (errors/sec.) field, enter the threshold value. Range of values: 1 to 1,000,000. By default, the check box is cleared and the field is set to 1000.
   5. If you want to specify a threshold for link utilization as a percentage of the bit rate of the service interface from which the link is established, select the Enable utilization monitoring check box and in the Critical utilization level (%) field, enter the threshold value. By default, the check box is cleared and the field is set to 95.
   6. In the Interval for processing latency, jitter, and packet loss (sec.) field, enter the time interval, in seconds, for measuring latency, jitter, and packet loss on the link. Range of values: 1 to 600. The default setting is 30.
   7. If you want to specify a threshold for latency in milliseconds for transmitting traffic over the link, select the Enable latency monitoring check box and in the Critical latency level (ms.) field, enter the threshold value. Range of values: 5 to 1000. By default, the check box is cleared and the field is set to 100.
   8. If you want to specify a threshold for jitter time in milliseconds for transmitting traffic over the link, select the Enable jitter monitoring check box and in the Critical jitter level (ms.) field, enter the threshold value. Range of values: 5 to 1000. By default, the check box is cleared and the field is set to 100.
   9. If you want to specify a threshold for the percentage of lost traffic packages on the link, select the Enable packet loss monitoring check box and in the Critical packet loss level (%) field, enter the threshold value. Range of values: 1 to 100. By default, the check box is cleared and the field is set to 2.
4. Save the link monitoring settings in one of the following ways:
   • To save the link monitoring settings, click Save.
   • If you want to save the link monitoring settings and specify the same settings on the corresponding opposite-direction link, click Save for both tunnels.
5. If you have configured link monitoring on a CPE device, click Save in the upper part of the settings area to save the device settings.