GigaSMART Rotational Sampling

Refer to Supported GigaSMART Operations Supported GigaSMART Operationsfor more details on the devices that support GigaSMART operations.

Rotational Sampling samples sessions by International Mobile Subscriber ID (IMSI), using a rotating or sliding IMSI range, that rotates automatically on a configurable interval, without disrupting the treatment of existing sessions. It rotates through the entire pool of subscribers over time, such that all subscribers can be sampled in.

The IMSI range size is configurable, the length of time for each period or window is configurable, and the amount it shifts or slides every period is also configurable.

This capability is used in network security and network performance, where sampling is desired, and sampling needs to be deterministic so that it is always known whether a subscriber is sampled in or out.

In classic Deterministic Sampling, the pool of IMSIs remains constant, but in Rotational Sampling, the pool of IMSIs is updated at regular intervals, such that all subscribers get an opportunity to participate in the sampling.

The rotations do not disrupt treatment of existing sessions. Entire sessions are sampled in or out based upon the occurrence of the "Create Session Requests” or "Session Establishment Requests". Once a session is sampled in, it will remain sampled in for the life of the session, even if the session's IMSI later rotates out of the sampling range. If the subscriber does not have any create session activity during their rotation window, then nothing will be forwarded for that subscriber in that round.

The following diagram illustrates an example of Rotational Sampling:

Supported Platforms Compatibility

This feature is supported in Non-CUPS LTE ( Non-CUPS GTP application) and UPN (Non-Overlap and Overlap). The table below outlines the supported compatibility.

Platforms	Non-CUPS		UPN
Platforms	Non - Overlap	Overlap	Non - Overlap	Overlap
GigaVUE‑HC3 Gen 3	ü	ü	ü	ü
GigaVUE‑HC3 Gen 2	ü	û	û	û
GigaVUE‑HC1-Plus Front	ü	ü	û	û
GigaVUE‑HC1-Plus Rear	ü	ü	û	û

Configuring Rotational Sampling in GigaVUE‑FM

GigaVUE-FM allows you to configure Rotational Sampling in the second level map of GTP Flow Sample and GTP Flow Overlap.

Note: The same configuration applies to UPN, with 3GPP node role for the GigaSMART group as user and mode as standalone.

To configure Rotational Sampling in second level maps, do the following:

On the left navigation pane, click on

Go to Physical > Nodes > Cluster ID.

Go to Traffic > Maps.

Click New.

Enter the Map information:

Enter an alias for the map.

Enter a description about the map.

Select the Type as Second level.

Select the Subtype as any one of the following to configure Rotational Sampling:

•

Flow Sample GTP

•

Flow Sample Overlap

Enable the Rotational Flow Sampling check-box.

Note: In GigaVUE‑FM, enabling Rotational flow Sampling means it selects the flow sampling type (fstype) as "rotational." Disabling the check-box means the flow sampling type is "default." The "fstype" is only applicable for 'secondLevel/flowSample' and 'secondLevel/flowSampleOverlap' map types.

Enter the percentage of sessions to be sampled in the given interval in the Offset range.

Enter the Timer range in minutes. The value ranges from 15 to 45000 minutes.

Follow the steps from 5 to 9 in the section Create a new mapto complete the configuration of rotational sampling.

You can also configure Rotational Sampling through Ansible. Refer to Installation and Configuration of Subscriber Intelligence Solution using Ansible to know more.

You can also configure rotational sampling through GigaVUE-OS CLI. Refer to the map and show map fs-stats all commands in the GigaVUE-OS CLI Reference Guide to know more.

Viewing the Configuration of Rotational Sampling for non-CUPS LTE and UPN

After configuring rotational sampling, GigaVUE-FM allows you to view the configuration for non-CUPS LTE and UPN. To view the configuration in GigaVUE-FM, follow these steps:

From the left navigation pane, go to Inventory > Physical > Nodes.

In the Map Statistics page you can view the column Rotational Sampling which can be either Enabled or Disabled. If the Rotational Sampling is Enabled, it would provide a quick link view.

The quick view contains the following columns:

Current Offset Amount
Remaining Sampling Time
Current Interval Start
Next Interval Start

The Rotational Flow Sampling is also supported in the legacy maps pages in GigaVUE‑FM. You can create and edit the "fstype" properties from the legacy Maps pages in GigaVUE‑FM GUI.

View a Rotational Sampling configuration in Mobility Solution

If you have configured Rotational Sampling through Ansible, then to view the configuration in GigaVUE-FM, do the following:

On the left navigation pane, click on

select Physical> Orchestrated Flows > Mobility, and then select the required cluster or node ID.

Select the required site from the Site drop-down list box.

From the Rules to Destination Tools block, select the drop-down, and click on the ellipses named as Details.

A Details-Rules to Geoprobe page appear. In the left-navigation page, click on the Second Level Maps.

Click on the Show Details for the required Fabric Map Name.

A page with details of Flow Sampling appears. In this page, you can view the details of rotational sampling such as Offset, Timer, CurrentOffset Amount, RemainingSampling.

Note: When configuring rotational sampling in UPN, the 3GPP node role for the GigaSMART group is user and mode is standalone.