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Threshold Crossing Alerts Tab

Configuration > Templates & Policies > TCAs > Threshold Crossing Alerts

Threshold Crossing Alerts (TCAs) are pre-emptive, configurable alarms triggered when specific thresholds are crossed.



The alerts are triggered with rising and falling threshold crossing events (that is, floor and ceiling levels). For both levels, one value raises the alarm while another value clears it.

  • When you configure appliance and tunnel TCAs with an Orchestrator template, all alerts apply globally, so all of an appliance’s tunnels have the same alerts.

  • To create a tunnel-specific alert, navigate to Configuration > Networking > Tunnels> Tunnels, select the tunnel, click the edit icon to access the tunnel directly, and then click the icon in the Alert Options column. Make your changes, and then click OK.

  • To view globally applied system and tunnel alerts, click System.

  • To view alerts that are specific to an individual tunnel, click Tunnel.

Times to Trigger – A value of 1 triggers an alarm on the first threshold crossing instance.


ON by Default

  • Appliance Capacity – Triggers when an appliance reaches 95% of its total flow capacity. It is not configurable and can be cleared only by an operator.

  • File-system utilization – Percent of non-Network Memory disk space filled by the appliance. This TCA cannot be disabled.

  • Tunnel latency – Measured in milliseconds, the maximum latency of a one-second sample within a 60-second span.

OFF by Default

  • LAN-side receive throughput – Based on a one-minute average, the LAN-side receive TOTAL for all interfaces.

  • WAN-side transmit throughput – Based on a one-minute average, the WAN-side transmit TOTAL for all interfaces.

  • TCAs based on an end-of-minute count:

    • Total number of flows

    • Total number of optimized flows

  • TCAs based on a one-minute average:

    • Tunnel loss post-FEC

    • Tunnel loss post-FEC

    • Tunnel OOP post-POC

    • Tunnel OOP post-POC

    • Tunnel reduction

    • Tunnel utilization (based on percent of configured maximum [system] bandwidth)

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