Threshold Crossing Alerts Template

Threshold Crossing Alerts (TCAs) are preemptive, user-configurable alarms triggered when the specific thresholds are crossed.

They alarm on both rising and falling threshold crossing events (i.e., floor and ceiling levels). For both levels, one value raises the alarm, while another value clears it.

Metrics and Defaults

Times to Trigger – A value of 1 triggers an alarm on the first threshold crossing instance. The default sampling granularity (or rate or interval) is one minute.

This table lists the metrics of each type of threshold crossing alert:

Metrics for Threshold Crossing Alerts  

	TCA Name	Unit	Metric
Appliance Level	WAN-side transmit throughput	kbps	Minute average WAN-side transmit TOTAL for all interfaces
	LAN-side receive throughput	kbps	Minute average LAN-side receive TOTAL for all interfaces
	Total number of optimized flows	flows	End of minute count
	Total number of flows	flows	End of minute count
	File-system-utilization	% (non-Network Memory)	End of minute count
Tunnel Level	Tunnel latency	msec	Second-sampled maximum latency during the minute
	Tunnel loss pre-FEC	1/10th %	Minute average
	Tunnel loss post-FEC	1/10th %	Minute average
	Tunnel OOP pre-POC	1/10th %	Minute average
	Tunnel OOP post-POC	1/10th %	Minute average
	Tunnel utilization	% of configured bandwidth	Minute average
	Tunnel reduction	%	Minute average

Note  Enabled by default, there is also an Appliance Capacity TCA that triggers when an appliance reaches 95% of its total flow capacity. It doesn’t automatically clear, but can be cleared by an operator. It is also not configurable.

Please send comments or suggestions regarding user documentation to techpubs@silver-peak.com.