White Seagull
IP Service Level Agreements (SLAs) - Real-Time Performance Monitor (RPM)

 

Cisco IOS IP Service Level Agreements (SLAs) or Juniper ' s Real-Time Performance Monitor (RPM) Technology enables customers to assure new business-critical IP applications, as well as IP services that utilize data, voice, and video, in an IP network. Cisco has augmented traditional service level monitoring and advanced the IP infrastructure to become IP application-aware by measuring both end-to-end and at the IP layer.

 


 

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With IP SLAs, users can verify service guarantees, increase network reliability by validating network performance, proactively identify network issues, and increase Return on Investment (ROI) by easing the deployment of new IP services. IP SLAs uses active monitoring to generate traffic in a continuous, reliable, and predictable manner, thus enabling the measurement of network performance and health.
 
Service Level Agreement is the ultimate and most appropriate service to use to monitor correctly and with credibility and accuracy your Network and data communications infrastructure is either Cisco ' s IP SLA or Juniper ' s Real-Time Performance Monitor Agents running already on you enterprise Cisco and Juniper Devices.
 
 
We can deploy it for the MENA markets to monitor network performance for ISPs and Enterprises.
 
IPSLA/RPM is also a diagnostic tool that uses active monitoring, which includes the generation of traffic in a continuous, reliable, and predictable manner and then be used to answer the following question:
 
  • How congested is your Wireless Broadband 3g network?
  • How stable are your routes? Are there too many Route Changes that degrades Data and Voice Quality on your 3g network in particular
  • What is your current 3g network latency and how does that latency behaves over time?
  • Where are the Bottlenecks and are there any patterns to them? 
  • What is your network ' s Planning Impairment Factor (ICPIF) loss/delay busyout threshold as an ITU-T G.113 standard to measure quality of service?
  • What is your network ' s Mean Opinion Score (MOS) as the numerical indicator of the perceived quality of received media after compression and/or transmission
 
 
The Need for IPSLA/RPM:
 
 
Enterprises are under increasing pressure to offer SLA’s to their internal customers or other departments or verify and measure outsourced SLAs. Service providers have an incentive to offer service level agreements, improve customer satisfaction, and guarantee their customers certain service levels.
   
Management requires contractual assurance that the network will meet business objectives, while end users want some assurance that their critical network applications and services will be available as needed. 
   
An SLAs or service level verification is often required before a company will deploy a new technology, business critical applications, or IP service, such as voice over IP (VoIP). 
 
Based on all of the above; the key services we can provide is to allow your organization to introduce new and interesting value added services that will surely establish then increase your customer satisfaction and loyalty while introducing new profit generating services with little initial investment. 
 
Below are the metrics that we can readily setup for many of our customer ' s core, edge, or Wireless Broadband networks to help assess and understand network voice and link quality:
 
  
Jitter
 
Expressed as a variation in the time between packets arriving, typically caused by network congestion or route changes. This means that the presence of jitter on a network is an issue. For example, data sent 5 ms apart should arrive at the destination 5 ms apart. If there are network problems, the data may arrive, say, 10 ms apart, leading to a jitter of 5 ms. It’s quite clear then, that in an ideal world, jitter should be 0. When monitoring jitter on your link, we have also included: source-to-destination jitter vs destination-to-source, average, and later we could add minimum and maximum jitter. Keeping jitter at all levels as close to zero will ensure your network is operating smoothly and your end-users aren’t complaining.
 
 
Latency 
 
Latency, or simply, the delay (time) between a packet sent against it being received, is an important indicator of quality of the network. Lower the latency, better your functionality.
 
 
MOS
 
The mean opinion score (MOS) is a numerical indication of the perceived quality of received media after compression and/or transmission. This is expressed as a single number from 1 (lowest perceived audio quality) to 5 (highest). (Multiplied X 100)
 
MOS Score Table
MOS Quality !Impairment 
5 Excellent Imperceptible 
4 Good Perceptible but not annoying 
3 Fair Slightly annoying 
2 Poor Annoying 
1 Bad Very annoying
 
 
ICPIF
 
The ICPIF, or Calculated Planning Impairment Factor loss/delay busyout threshold is an ITU-T G.113 standard to measure quality of service, or QoS. ICPIF represents predefined combinations of loss and delay on a VoIP call. ICPIF values for each call are generated by the gateways. 
 
To summarize, the statistics we collected are: 
  • Jitter: Destination to Source and Source to Destination, RTT Jitter, and Average Jitter 
  • Latency (one way, minimum, max)  –Can be added later on-- Out of Sequence , MIA ' s, Packet Loss S-D, Packet Loss D-S, Late Arrivals. 
  • MOS 
  • ICPIF

 

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