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Congestion notification, proposed solutions DSCP remarking of data packets, proportional marking Advantages: Fast response (~100 ms) Terminates or pre-empts the required number of flows (estimation of the per flow congestion percentage) Standard Diffserv procedures used Can be used both for elastic and inelastic traffic Can be used together with end-to-end ECN marking Disadvantage: requires 2 DSCPs per PHB QoS-NSLP refresh messages Advantages: Standard QoS-NSLP procedure is used Terminating/pre-empting the required number of flows (congestion %) DSCP marking is not required Can be used together with end-to-end ECN marking Disadvantage: slower response than in case of data marking (depending on the frequency of refresh messages) |