Method for congestion management of a network, a switch, and a network

A switch, comprising:

• a plurality of ingress ports and a plurality of egress ports, the switch being for connection in a network of other like switches;
• memory for storing data packets;
• a control system arranged to operate in accordance with Regional Explicit Congestion Notification, the control system being arranged in use to control the switch to, upon receipt at one of the ingress or egress ports of notification of congestion at a first downstream congested port, either store at said ingress port or egress port data packets received for said congested port or to communicate with an upstream port for storage at said upstream port of data packets destined for the congested port, and in dependence on the amount of stored data, to send a message to a further upstream port informing the further upstream port of the congestion at the first downstream congested port;
• wherein the memory for storing data packets is provided only at the ingress ports or only at the egress ports of the switch.