Congestion Avoidance

• Congestion Avoidance is almost the same as Slow Start

• • Begins when cwnd=ssthresh
  • • cwnd increases much more slowly
  • Once cwnd=awnd, cwnd stops growing
  • Upon receiving a “new” ACK
  • • cwnd = cwnd+2*MSS/cwnd

• Otherwise Slow Start and Congestion Avoidance behave the same