You should select a probe that is capable of collecting data at a level of detail that will indicate the true overall performance of the link or segment of the network being monitored and that has enough memory to store data for accurate historical analysis. Also make sure a probe is capable of collecting data even at the network's near-saturation point, when visibility is most crucial. Some probes claim to work with several types of network media. These probes generally do not provide enough data specific to the media being monitored. If you are measuring ATM links, choose a probe that was designed specifically for ATM that tracks and reports on areas such as permanent virtual circuits, connection usage, switched virtual circuits, and physical layer and ATM Adaptation Layer-5 usage and errors.
Placement is the most important factor in gaining maximum value from probes.
With these links, it is imperative you place the probe at the first physical point where the circuit enters your network. IT managers will need greater visibility into their enterprise networks to pinpoint potential problems before they effect performance and hamper e-business. Probes provide that necessary visibility. Related links Cooper is a regional engineer at Agilent Technologies NetMetrix Division in Palo Alto. Feedback Tell us your thoughts on this article or the issues raised in it.