A method, apparatus, and signal-bearing medium for indicating and
responding to congestion in a network. When a buffer at a receiver is
nearly full, the receiver may send a congestion indication to the
sender(s) that is causing the congestion. When the receiver(s) receives
the congestion indication, it may implement a flow-control technique to
temporarily lower the rate that it is sending the frames to the receiver,
and then increase the rate.