Expert Advice

N3T_TN3270_Avg_IP_Resp_Time  
Situation Description
Suggested Actions
Situation Description

The average IP response time measured over the last response time collection interval

 

Suggested Actions

Average IP response time measured over the last response time collection interval. Response time collection interval is specified on the AvgSampPeriod parameter of MONITORGROUP statement in the TCP/IP profile dataset. The probable cause of a high average IP response time is network congestion. Possible procedures to isolate and correct the problem include the following:

  1. Determine if other TCP/IP connections from or to the same subnet have high average IP response times. This might indicate a router congestion problem.
  2. Issue a trace route command to determine the most probable routing path.
  3. Determine if the routing path being used is a secondary or backup routing path. If the primary path is not being used, identify and fix the problem with the primary path.
  4. Query the routing interfaces on the routing path to determine the number of packets dropped.
  5. Identify the routers along the routing path with highest numbers of packets being dropped.
  6. Validate the router configuration parameters.
  7. Check the OSA adapter metrics to determine if adapter constraints (such as excessive processor utilization or discards at the receive side) exist.

This situation is triggered when the average total response time is greater than 1.0 seconds.

As provided, this situation is not started automatically.

Note: Applicable only when monitoring TN3270 servers running on z/OS v1.8 and higher.

 

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