Metered Licensing Management

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Table of Contents

1.1Document Purpose

1.2Intended Audience

2.1Features of MELA

2.2How MELA Works


4.2Report Data

4.3Automatic Reporting



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 metering and 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.

Figure 1‑1: Example scenario for one month with three VLMs

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

1.1Document Purpose

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

1.2Intended Audience

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

2MELA Overview

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

  • Enterprises:

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

2.1Features 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.

2.2How MELA Works

Figure 2‑1: How MELA Works

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 – i.e. you are billed for the previous month

KEMP 360 Central sends usage reports to KEMP in order to keep the LoadMasters licensed:

  • There is a grace period of 90 days, during which the KEMP 360 Central instance will continue 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 will stop working and all ASL LoadMasters will be removed. These ASL LoadMasters need to be re-added and be re-licensed in order to use them again.

C:\Users\kgaffney\Dropbox (Kemp Technologies)\documentation updates\KEMP360 Central\Screenshots\grace_period.png

Figure 2‑2: Grace Period

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 4.3.

3License 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.

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.

4Usage 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:

Figure 4‑1: Settings and Configuration Cog

  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.

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


Figure 4‑2: ASL Instances (partial screenshot)

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.

4.2Report Data

Figure 4‑3: Report Data

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

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.

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
  • On a daily basis 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.

4.3Automatic Reporting

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

Figure 4‑4: Automatic Reporting

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 in order 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

Document History



Reason for Change



June 2016

Initial draft

First draft of document



July 2016

Release updates

Updates for V1.7



Sep 2016

Release updates

Updates for V1.9



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