gtpc1m7hTransmission Control Protocol/Internet Protocol

Starting the IP Trace Facility and Specifying Which Data to Trace

Use the ZTTCP TRACE command to start the IP trace facility and specify which resources to trace. The TPF system stores the data being traced in entries in the IP trace table.

You can use the IP trace facility to trace the following:

You can start more than one trace at the same time; for example, you can trace the data for IP router X and local IP address 1.1.1.1. Depending on how you define your traces, some traces may overlap other traces. For example, if you start tracing the data for IP router X and then start tracing the data for the local IP address later, the trace defined for the local IP address will overlap the trace defined for IP router X. In addition, if you have traces defined for specific resources and then start tracing all resources later, the trace defined for all resources will overlap the traces defined for specific resources.

At any time, you can display information about the status of the IP trace facility and the data being traced. See Displaying Information about the IP Trace Facility for more information.

To start the IP trace facility, do the following:

  1. Enter one or more ZTTCP TRACE commands with the START parameter specified to start the IP trace facility and specify which resources you want to trace.
  2. Enter the ZTTCP TRACE command with the SIZE parameter specified to specify how many bytes of user data in each IP packet to store in the IP trace table. See Defining How Much Data to Store in the IP Trace Table for more information.
  3. Enter ZTTCP TRACE START TAPE to start writing the IP trace table to a real-time tape. See Writing the IP Trace Table to a Real-Time Tape for more information.