Entuity Service Level Management: IP SLA Service Model

TT 2Our first Tech Tip on Entuity Service Level Management provided an overview of its importance and effectiveness for monitoring the network from a business perspective. This week we’ll discuss IP SLA Service Modeling.

Tech Tip 2

Did you know that Entuity Service Level Management provides an IP SLA Service Model that lets you use synthetic IP SLA operations to test application performance over a WAN connection? This is extremely useful, for example, for testing the quality of critical business applications across a service provider’s environment. For example, to check the quality of a VoIP application, you can define a service comprising jitter probes or VoIP-based probes that have been set up to collect MOS (mean quality score) ratings. This allows you to regularly check that service quality is meeting the terms of the SLA.

You can also bind an IP SLA operation in a service definition along with interfaces or a core router at the far end to check for device or circuit availability or to see whether or not the performance of critical applications is ok.


In this report, an IP-SLA test has been configured to test access to a web site. The graph provides detail on the overall performance of the http request. It measures the time taken to look up the site (DNS translation time), the time for the page to be processed by the web server (HTTP download time), the time for the packets to be transmitted (TCP time) and the time for the entire operation to complete (total operation time). If there is a threshold configured for the test, then this is also displayed on the graph as a red horizontal line.


Above is a custom web chart that displays the following VoIP metrics: Round-trip latency, Jitter DS (Destination to Source), Jitter SD (Source to Destination) and MOS. The first three metrics (latency, jitter DS and jitter SD) affect the overall quality of the voice. Voice quality is measured using MOS (Mean Opinion Score). MOS is measured on a scale of 0 to 5 with 0 being the worst quality and 5 being the best. Usually, any measurement below 3 indicates a problem that would need to be investigated.

Not Familiar with Entuity Services?

One of the ways Entuity brings business focus to network management is through its service level management feature, “Entuity Services.” This feature lets you model network resources that you manage through Entuity into the business services that they deliver. For example, you could create an Entuity service for an important business application by grouping a collection of components that service depends on such as devices, ports, interfaces, WAN links, and more. This elevates monitoring from an individual component basis, to a higher-level business perspective. Operational anomalies, alerts or outages of any underlying components are visualized against the services, for insight into business impact. To learn more about Entuity Services, see the following videos:

Go to Tech Tip 3.

Share This