Metered Licensing Management

1 Introduction

Metered Enterprise License Agreement (MELA) is a Virtual LoadMaster (VLM) licensing model based on usage rather than number of instances. KEMP 360 Central monitors the usage of VLMs licensed using the Activation Server Local (ASL) functionality. Reports are provided to KEMP Technologies to facilitate billing.

Non-ASL LoadMaster can also be added to MELA KEMP 360 Central instances – but they will not count towards MELA usage.

The example scenario below shows the usage for three VLMs during a one-month period.


In the example scenario shown, KEMP calculates the monthly throughput as 1.5 + 2.7 + 5.3 = 9.5 (Gbps). KEMP charges monthly, in arrears, based on the MELA usage tiers.

1.1 Document Purpose

This document provides information on Metered Licensing Management in KEMP 360 Central.

1.2 Intended Audience

Anyone who is interested in finding out further information regarding Metered Licensing Management in KEMP 360 Central.

2 MELA Overview

Both enterprises and service providers find MELA useful, due to the following reasons:


- MELA provides flexibility with fixed pricing

- You can deploy, kill and redeploy Application Delivery Controller (ADC) resources on demand. This can be useful in certain environments, such as:

- Development and Test or DevOps environments

- Hybrid cloud environments

Service providers:

- MELA makes it possible to cost effectively reach customers of any size with micro-ADC instances

- It is possible to oversubscribe for maximum return on investment

- There is no hardware, meaning existing infrastructure can be leveraged

2.1 Features of MELA

Some MELA features are below:

There is no practical limit to the number or type of VLM instances.

KEMP 360 Central licenses and meters each instance.

For further information on KEMP 360 Central, refer to the KEMP 360 Central, Product Overview.

KEMP 360 Central licenses the VLMs.

For further information on this, refer to the KEMP 360 Central Activation Server, Feature Description.

MELA never enforces limits on the LoadMaster – the VLM throughput is limited by the size of the deployed VLM.

2.2 How MELA Works

How MELA Works.png

The above diagram depicts how MELA works:

Usage (network throughput and SSL transactions) is sampled every five minutes

Daily usage reports are provided to KEMP using KEMP 360 Central

Customers can view and download usage reports

The monthly usage reports determine what tier the subscription is on

Bills are provided monthly, in arrears – that is, you are billed for the previous month

KEMP 360 Central sends usage reports to KEMP so that KEMP can charge the customer appropriately:

There is a grace period of 90 days during which the KEMP 360 Central instance continues to work as normal even if KEMP 360 Central does not provide any usage reports.

When KEMP 360 Central sends a usage report, the grace period reverts to 90 days.

If KEMP 360 Central does not send any usage reports during the 90-day grace period, KEMP 360 Central stops working and all ASL LoadMasters are removed. These ASL LoadMasters must be re-added and be re-licensed to use them again.

How MELA Works_1.png

During the grace period, KEMP 360 Central displays how many days remain until the license expires.

To find out how to provide reports to KEMP, refer to Section Automatic Reporting.

3 License a MELA KEMP 360 Central Instance

After installing the KEMP 360 Central instance, please license it.

For installation instructions, please refer to the relevant Installation Guide on the KEMP Documentation page:

When using a Metered Enterprise License Agreement (MELA):

A Contract ID is required. KEMP provides a Contract ID when you purchase a MELA license.

A MELA KEMP ID and password are required. If you do not already have a KEMP ID, register one here: Contact your KEMP representative to get the KEMP ID changed to a MELA KEMP ID before licensing.

SPLA builds are to be used where the LoadMaster is being deployed under a Service Provider Licensing Agreement (SPLA) or a Metered Licensing Agreement (MELA). SPLA builds will only license successfully against a KEMP ID that has been explicitly enabled by KEMP for SPLA or MELA.

For further information on licensing the KEMP 360 Central machine, please refer to the KEMP 360 Central Licensing, Feature Description, but remember that a Contract ID is needed instead of an Order ID.

4 Usage Reports

Reports are available in KEMP 360 Central that help to keep track of the LoadMaster instances. To view these reports, follow the steps below:

Usage Reports.png

1. In the bottom-left corner of the KEMP 360 Central User Interface (UI), click the cog icon.

2. Click Metered Licensing Management.

This screen displays information and metrics data on LoadMasters licensed using the ASL functionality. There are three tabs in the Metered Licensing Management section: Activations, MELA Report, and Licenses. To view reports, click the MELA Report tab. For more information, refer to the MELA Report section of the KEMP 360 Central Feature Description.

For further information on ASL, refer to the KEMP 360 Central Activation Server, Feature Description.

4.1 Instances

Report Data_7.png

KEMP 360 Central records and stores the following for each ASL instance:

MAC Address: Each device has a unique media access control (MAC) address to identify it for communications purposes.

LoadMaster Version: Firmware version installed on the LoadMaster.

Status: There are two possible statuses; Active and Disabled.

Activation Date: The initial activation date of the particular ASL instance.

Boot Date: The initial boot date of the particular ASL instance.

Last Kill Date: The date the particular ASL instance was last killed.

License Type: The type of license assigned.

VLM Name: The name of the hypervisor platform on which the unit is runningthe VLM.

4.2 Report Data

In this section, users can view a report displaying the number of active ASL instances. Select a date range to filter the report.

Report Data.png

Download the reports in zip format by clicking the Download button. The downloaded zip file contains three CSV files. Descriptions of each report are in the sections below. To view a graphical representation of the data, click View MELA Report.

Event Report

The Event Report displays events and the number of active ASL instances at the time of the event. The events recorded are as follows:

Activation: An ASL LoadMaster has been activated using this KEMP 360 Central instance

Deactivation: An ASL LoadMaster on this KEMP 360 Central instance has been deactivated

Sync (Discrepancy): KEMP 360 Central has detected a discrepancy between the previously recorded instance count and the actual instance count, and has corrected the error

Sync (No Discrepancy): KEMP 360 Central has not detected any discrepancies. In the absence of other ASL events, this serves as the instance count for any given day.

KEMP 360 Central performs the sync task in the following circumstances:

If KEMP 360 Central is upgraded to v1.6 or later

Daily at 12pm

If there is an upgrade, KEMP 360 Central records the number of active ASL LoadMasters (if any) at the time of the upgrade. KEMP 360 Central records this in the audit log reports (at an INFO level). KEMP 360 Central does not record this if no ASL LoadMasters are present.

For the daily task, if the last known number of ASL instances does not match the current number of ASL instances, KEMP 360 Central records the discrepancy and the audit log reports (at an ERROR level) the discrepancy and the previous/current number of active instances.

SSL TPS Report

An SSL Transactions Per Second (TPS) report showing the peak number of SSL TPS per LoadMaster, per day.

Virtual Service Bytes Report

A report displaying the peak number of bytes transmitted by the Virtual Services per LoadMaster, per day.

These reports include daily peaks from the start date selected up to the time of running the report. To get a full report, leave the Summary check box unchecked. To get a summarized report, select the Summary check box.

MELA Report

To view a MELA Report for a specific date range, select the date range then click View MELA Report.


This report provides you with a graphical representation of the information such as the maximum number of ASL instances that occurred during the report period, the maximum number of SSL transactions and the maximum throughput for each individual day. This enables you to monitor usage and determine how much you will be charged.


There is also a table under the graph that displays the information in tabular format.

Report Data_3.png

You can also view detailed individual graphs on the maximum number of SSL transactions per device. The graph and following table below shows results for two devices over 15 days.


In addition, you can view the peak throughput per device and see the aggregate used over the time period.

You can print the file in pdf format if required.

4.3 Automatic Reporting

KEMP 360 Central compiles monthly reports on data usage and KEMP use this data to bill customers. KEMP 360 Central currently reports on traffic, SSL TPS and Virtual Service bytes transferred for all ASL LoadMasters.

There are two ways to provide usage reports to KEMP:

Select the Upload usage report to KEMP check box and click the Upload button.

Select the Send monthly usage report via email check box. To send a copy of the report, enter the receiving email address in the Send bcc to text box.

You must configure the SMTP settings to send emails. For further information, please refer to the KEMP 360 Central, Feature Description.



Unless otherwise specified, refer to the following documents at

KEMP 360 Central Activation Server, Feature Description

KEMP 360 Central, Feature Description

KEMP 360 Central, Product Overview

KEMP 360 Central Licensing, Feature Description

Last Updated Date

This document was last updated on 03 October 2017.

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