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Pre-Congestion Notification (PCN) is currently being developed by the IETF to provide admission control in DiffServ networks for non-elastic flows. Various marking schemes are being proposed as part of this effort. The authors evaluate a new marking behaviour that could be used to signal three different states by means of a single bit. This scheme is of interest to networks operating with MPLS as the Label QoS coding space is limited to three EXP bits. Similar to the ECN standard for MPLS, this research assumes that just two code-points will be available to indicate different congestion states. Of these two code-points, one would be used to differentiate between PCN and non-PCN traffic and the other would be used for PCN marking.
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