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344 Avaya Application Solutions IP Telephony Deployment Guide
The Converged Network Analyzer
The Converged Network Analyzer (CNA) is an offer from the Avaya Application Assurance
Networking (AAN) line of products. It provides two principal value propositions:
● visibility
● path optimization.
Visibility is achieved through the use of real time measurements of the network infrastructure.
These measurements feed extensive reports and diagnostics tool, which give the user powerful
capabilities. On one end of the spectrum, CNA enables the user to monitor the general health of
their network and its ability to support demanding applications such as voice, video, and real
time TCP applications. On the other end of the spectrum, CNA enables the user to troubleshoot
the cause of a specific network problem.
Path optimization functions as follows: when two paths or more are available between two
measured end points, CNA can measure all of the available paths simultaneously. If any
problem is detected on one of the paths, CNA can intervene in real time and send route updates
to the edge routers, moving the traffic to a non-impaired path. The result is unaffected user
experience in the face of network outages.
CNA features a range of application models that assess network conditions. The models focus
on the specific characteristics and requirements of different applications:
● Voice
● Video Conferencing
● Video Streaming
● Web applications
● Enterprise TCP applications
Using these application models, CNA translates the performance characteristics of the network
path (e.g., latency, jitter, and loss) into Application Performance Ratings (APR). The APRs
provide a relative measure of performance if the application were run over this network fabric.
In addition, CNA automatically discovers applications running over the network and can
optionally measure load over various links in the network. A sophisticated policy language
allows the user to specify precise policies in terms of:
● What applications to optimize
● The performance level to maintain for these applications
● The preferred paths through which to send traffic for these applications
● Load thresholds not to exceed on specific paths.
The CNA package comprises servers that perform most of the analysis, provide the path
optimization functionality, and store the reports. CNA also comprises optional no cost test
agents that are embedded in an array of avaya phones, gateways, and Avaya partner products