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Major Points Motivation Simple network traffic condition notification Control at application Would like to extend the usage of ECN for real-time UDP flows Voice (IP telephony), video conferencing and video/multimedia streaming flows No impact to ECN for TCP (RFC 3168) Building on concepts in RFC 3168 New or modified ECN semantics are needed Some applications need to support two levels of traffic load indication ECN bits are used to convey on-path traffic levels detected in the network to the end-system / application As in RFC 3168, the end-system / application must react to ECN bit markings accordingly This draft does not document behavior of the application DiffServ and different service classes are used to separate real-time from other flows |