Using the REXMIT option on D EEDIAG

Find all Enterprise Extender connections whose retransmission rates meet or exceed 5%, display the output in summary format, and clear all diagnostic counters after command processing is complete:

D NET,EEDIAG,REXMIT=5,CLEAR,LIST=SUMMARY

See z/OS Communications Server: SNA Operation for the display output.

Tip: The DISPLAY EEDIAG command has various formats in which the connection information can be displayed. This sample command does not use any command filters. The DISPLAY EEDIAG command can be specified with the ID, HOSTNAME, or IPADDR filters to limit the scope of the search.

Message IST2067I displays the date and time the DISPLAY EEDIAG command was issued.
Message IST2069I displays the date and time when the REXMIT counters were last cleared. The date and time provided in the message combined with the date and time taken from message IST2067I, provides the time interval in which the retransmission metrics were collected.
Message IST2036I displays the total number of network layer packets (NLP) that have been sent across this EE connection for this specific priority. This value is maintained from the time and date specified in message IST2069I. Message IST2036I is associated with a specific port priority represented by a subgroup of messages; the subgroup begins with either message IST2030I, IST2031I, IST2032I, IST2033I, IST2034I, or IST2035I.
Message IST2038I displays the retransmission rate for this EE connection. The retransmission rate is valid from the time and date specified in message IST2069I. If the retransmission rate is excessive, this indicates problems within the IP transport network. Large numbers of retransmissions because of network congestions result in poor RTP performance. If excessive retransmissions occur, RTP path switching might occur. Message IST2038I is associated with a specific port priority represented by a subgroup of messages that begins with either message IST2030I, IST2031I, IST2032I, IST2033I, IST2034I, or IST2035I.

Rule: If you specify REXMIT=xx with the LIST=SUMMARY option, the display provides an overall retransmission rate for all port priorities. It is possible the retransmission rate displayed in message IST2068I, associated with all port priorities, is smaller than the specified REXMIT=xx rate. This means that at least one of the EE port priorities for this EE connection is experiencing a retransmission rate that meets or exceeds the specified rate. In this case, the LIST=SUMMARY option displays the message groups for the specific port priorities that meet or exceed the specified rate, along with the summary of all port priorities.

Messages IST2071I, IST2072I, and IST2073I all display the number of EE connections that had either the REXMIT counter, SRQRETRY counter, or both counters cleared as part of command processing. The number of EE connections cleared might be larger than the number of EE connections displayed in message IST2042I. For example, a local IPADDR that is used by 500 EE connections might be specified on the command. The CLEAR=REXMIT option will clear the REXMIT counters for all 500 EE connections. However, only one of these EE connections might be experiencing retransmission problems. In this case, message IST2042I lists only one connection displayed.