AT&T performs synthetic or active measurements across its IP backbone continuously to monitor “path-level” performance metrics such as round-trip delay, loss, jitter and out-of-sequence events. This monitoring helps AT&T understand the IP Backbone’s performance, including impact on time-sensitive applications. Active monitoring provides information for network design and maintenance to better support stringent performance expectations. This experience is the basis for our contributions to the IETF IPPM Working Group, where the goal is to standardize useful, practical active measurements.
This talk will discuss the methodology and use of active measurements on the AT&T IP Backbone. Examples that reveal the use of these measurements in the troubleshooting process given traditional Fault and Passive measurements will be shown. Examples of selected ‘interesting’ events will also be presented.
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