A network system (10). The system comprises a first network node (MN.sub.x), and that node comprises an input (30.sub.IN) for receiving a packet, and the node also comprises a buffer (30.sub.LC), coupled to the input and for storing the packet. The first network node also comprises circuitry (50) for detecting when a number of packets stored in the buffer exceeds a buffer storage threshold and circuitry, responsive to a detection by the circuitry for detecting that the number of packets stored in the buffer exceeds the buffer storage threshold, for issuing a pause message (60) along an output to at least a second network node. The pause message indicates a message ingress address (60.sub.2) and a message egress address (60.sub.2), where that message ingress address and the message egress address correspond to a network ingress address and a network egress address in a congestion-causing packet received by the first network node. The pause message commands the second network node to discontinue, for a period of time, transmitting to the first network node any packets that have the message ingress address and the message egress address.

 
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> Atomic lookup rule set transition

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