Transport Layer 3-101 Case study: ATM ABR congestion control ABR: Available Bit Rate:  elastic service  if sender's path underloaded :  sender should use available bandwidth  if sender's path congested:  sender throttled to minimum guaranteed rate RM (Resource Management) cells:  sent by sender, interspersed with data cells  bits in RM cell set by switches ( network-assisted )  NI bit: No Increase in rate (mild congestion)  CI bit: Congestion Indication  RM cells returned to sender by receiver, with bits intact
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