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Probe: BGP Monitoring

The BGP Session Monitoring probe shows BGP session status for all switches and raises anomalies for flapping BGP sessions. In Freeform blueprints, the probe also monitors and raises anomalies when BGP sessions are down, missing or unknown (new in Apstra version 4.2.0). (In Datacenter blueprints, BGP session up and down state is included with built-in telemetry, so it's not required in this probe.)

The probe includes 4 processors and stages as shown below:

BGP Session

The BGP Session processor includes the parameters as shown in the screenshot below:

Screenshot of a network tool showing BGP session analysis with stages for BGP Session Down and Flapping, and properties like Graph Query and Service Interval.

The BGP Session stage shows all BGP sessions for devices.

BGP Session Down

BGP Session Down is included only in Freeform blueprints. The processor includes the parameters as shown in the screenshot below:

BGP session monitoring interface showing stages: BGP Session, BGP Session Down, BGP Session Flapping, Sustained BGP Session Flapping. Anomalous states include down, missing, unknown. Retention duration is 1 day.

The BGP Session Down stage determines if the BGP session is not "up" and raises an anomaly accordingly.

BGP Session Flapping

The BGP Session Flapping processor includes the parameters as shown in the screenshot below:

BGP session monitoring tool showing stages: BGP Session, BGP Session Down, BGP Session Flapping, Sustained BGP Session Flapping. Processor details: input name 'in', stage 'BGP Session', column 'flap_count_inc', anomalous range '>= 1', raise anomaly 'False'.

The BGP Session Flapping stage checks if the BGP session has new flaps for the last service interval period. (2 minutes by default).

Sustained BGP Session Flapping

The Sustained BGP Session Flapping processor includes the parameters as shown in the screenshot below:

Screenshot of a network tool showing BGP session stages: Session Down, Session Flapping, and Sustained Flapping. Processor details include time window of 5 minutes and anomaly detection for sustained flapping over 2 minutes.

The Sustained BGP Session Flapping stage checks if the BGP session has new flaps for the specified period of time. For example, assume there are BGP flaps between leaf1 and spine1 nodes. The fabric BGP session between these nodes generates new BGP flaps when the interface status is changed on spine1 that's connected to leaf1. When shutdown and up interface is performed seven times on spine 1, it creates seven flaps for fabric BGP sessions between leaf1 and spine1. The seven new flaps are added and two anomalies are raised.

For more information about this probe, from the blueprint, navigate to Analytics > Probes, click Create Probe, then select Instantiate Predefined Probe from the drop-down list. Select the probe from the Predefined Probe drop-down list to see more details specific to the probe.