Reassembly percentage is the total number of IP segments received requiring reassembly, divided by the total number of IP segments received. Messages can become fragmented when transmitted across a network. Message fragments must be reassembled before delivery to an application. Excessive reassembly wastes network resources and degrades network performance. See the IBM z/OS Communications Server IP Diagnosis Guide for help in isolating the cause of the reassemblies and take corrective action.
By default, this situation starts automatically.