Measurement and analysis of single-hop delay on an IP backbone network

We measure and analyze the single-hop packet delay through operational routers in the Sprint IP backbone network. After presenting our delay measurements through a single router for OC-3 and OC-12 link speeds, we propose a methodology to identify the factors contributing to single-hop delay. In addition to packet processing, transmission, and queuing delay at the output link, we observe the presence of very large delays that cannot be explained within the context of a FIFO output queue model. We isolate and analyze these outliers. Results indicate that there is very little queuing taking place in Sprint’s backbone. As link speeds increase, transmission delay decreases and the dominant part of single-hop delay is packet processing time. We show that if a packet is received and transmitted on the same linecard, it experiences less than 20 s of delay. If the packet is transmitted across the switch fabric, its delay doubles in magnitude. We observe that processing due to IP options results in single-hop delays in the order of milliseconds. Milliseconds of delay may also be experienced by packets that do not carry IP options. We attribute those delays to router idiosyncratic behavior that affects less than 1% of the packets. Lastly, we show that the queuing delay distribution is long-tailed and can be approximated with a Weibull distribution with the scale parameter, , and the shape parameter, to .