Expert Advice

N3T_IP_Input_Discard_Pct  
Situation Description
Suggested Actions
Input datagram discard percentage greater than or equal to three percent

 

Input Discard Percentage is the percentage of IP segments that this TCP/IP address space received from the network that were undeliverable and discarded during the most recent sampling interval. Input discards are datagrams that were discarded, including no route found errors, unknown or unsupported protocol errors, truncation errors, invalid address errors, and reassembly failures.

Excessive discards waste network resources. Analyze the errors reported in the IP Statistics, Interfaces, and OSA workspaces to further isolate the source of the problem.

A trace might be needed to determine the source of the discards. Discard reason codes (found in IBM z/OS Communications Server: IP and SNA Codes) may be used to filter the trace data to show only the packets pertaining to issues discovered in the IP statistics and interface investigation. When the offending interface or application or both have been identified, see the IBM z/OS Communications Server: IP Diagnosis Guide to take corrective action.

 

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