20. Components » Sensor Cluster

Sensor Cluster aggregates the traffic statistics collected by Packet Sensors and Flow Sensors into a single anomaly detection domain and/or IP graphing domain. It is usually used to create a single logical interface from two or more router interfaces monitored by Flow Sensor, or to group up several Packet Sensors that listen to bonded interfaces or to different NIC queues.

To add a Sensor Cluster, click the [+] button found on the title bar of the Configuration » Components panel. To configure an existing Sensor Cluster, go to Configuration » Components, then click its name.

SENSOR_CLUSTER_CONFIGURATION

The Sensor Cluster Configuration window is a single form. The Sensor Name, the Sensor Server, the IP Zone and at least one Associated Sensor are mandatory, and [Save] stays greyed out until they are filled in.

Sensor Cluster Configuration parameters:

Sensor Name – A short label for easily identifying the Sensor Cluster. The colored square inside the field sets the color used in graphs for the Sensor Cluster; the default is random
Device Group – Enter a description if you wish to organize components (e.g. by location, characteristics) or to permit fine-grained access for roles. The combo box is editable, so you can type a new group instead of selecting an existing one
Sensor Server – Select a server that meets the minimum system requirements for running the Sensor Cluster. The button on the right opens the configuration of the selected server
Associated Sensors – Choose which Packet Sensors, Flow Sensor interfaces, or SNMP Sensor interfaces you want the Sensor Cluster to aggregate. Sensor Clusters themselves are never listed, so they cannot be nested. The drop-down carries a search box that filters the list as you type, a Select All checkbox that picks every entry the filter leaves visible and clears them again when unticked, and a Selected: n/m counter
Link Speed IN / OUT – Enter the combined bandwidth or capacity of the aggregated interfaces. These values are used for percentage-based reports and bits/s thresholds
IP Zone – Sensor Cluster uses the IP Zone to determine network boundaries and apply per-subnet settings. The button on the right opens the selected IP Zone
IP Graphing – Sensor Cluster can generate IP graphs for the summed up traffic data. It defaults to Not Aggregated
Aggregated – Enables IP graphing within the Sensor Cluster and disables IP graphing in the associated Sensors
Not Aggregated – Enables IP graphing per associated Sensor and disables IP graphing in the Sensor Cluster
Anomaly Detection – Sensor Cluster can detect anomalies in the summed up traffic data. It defaults to Aggregated
Aggregated – Enables anomaly detection in the Sensor Cluster, disabling it in associated Sensors. To view anomaly graphs, set IP Graphing to Aggregated as well
Not Aggregated – Enables anomaly detection in each associated Sensor, disabling it in the Sensor Cluster
Duplicated – Enables anomaly detection in both the Sensor Cluster and the associated Sensors
Performance – Adjust how aggressively the Sensor Cluster uses system resources:
Conservative – Single anomaly-processing thread
Balanced – 10 anomaly-processing threads
Custom – Manually set the number of threads:
SENSOR_CLUSTER_OPTIONS_PERFORMANCE
Anomaly Threads – Number of parallel threads dedicated to anomaly processing, up to 255. Each thread maintains a dedicated SQL connection. Leave it on Auto to let the Sensor Cluster decide
Interface Threads – Number of parallel database connections used to fetch the Associated Sensors’ traffic data on every cycle. A value of 1 disables parallel fetching, and the field cannot exceed the number of Associated Sensors you have selected. Increase it when the Sensor Cluster aggregates many Sensors and logs skipped ticks or “Performance issues” events
Comments – Record any Sensor Cluster notes here. These remarks are for internal reference only and will not be visible elsewhere. The section stays collapsed until it holds text

When a Sensor that the cluster referred to has since been deleted, saving quietly drops it from the Associated Sensors list. A Sensor Cluster left without a single Associated Sensor is refused.

[Save] writes the configuration. [Delete] appears only after the Sensor Cluster has been saved once, and asks for confirmation. A Sensor Cluster that is still used by a Reports » Dashboards widget or by a Scheduled Reports entry cannot be deleted; the Console names what still refers to it.

A Sensor Cluster that still detects active anomalies cannot be deleted either — wait until no anomaly is active, or stop them manually.

To start the Sensor Cluster, click the on/off button next to its name in Configuration » Components and confirm. Monitor the event log and Reports » Devices » Overview to confirm it starts correctly and traffic values are being recorded.