AuthorsP. Eardley, N. Others and B. Briscoe
EditorsP. Eardley
TitleMetering and Marking Behaviour of PCN-Nodes
AfilliationCommunication Systems, Communication Systems
Publication TypeTechnical reports
Year of Publication2009
Date Published11/2009
PublisherRFC Editor
Other NumbersISSN 2070-1721
KeywordsAdmission Control, Algorithm, AQM, congestion control, Data Communication, Differentiated Services, Internet, networks, Notification, Pre-Emption, Protocol, QoS, Quality of Service, Signalling, Termination

The objective of Pre-Congestion Notification (PCN) is to protect the quality of service (QoS) of inelastic flows within a Diffserv domain in a simple, scalable, and robust fashion. This document defines the two metering and marking behaviours of PCN-nodes. Threshold-metering and -marking marks all PCN-packets if the rate of PCN-traffic is greater than a configured rate ("PCN-threshold-rate"). Excess-traffic-metering and -marking marks a proportion of PCN-packets, such that the amount marked equals the rate of PCN-traffic in excess of aconfigured rate ("PCN-excess-rate"). The level of marking allows PCN-boundary-nodes to make decisions about whether to admit or terminate PCN-flows.

Citation KeyEardley09:PCN-mark