Three levels of tracing for the SNA links are provided: node
tracing, intrinsic tracing, and link-level tracing. Node
tracing for SNA Transport is on a node basis and normally
is turned off. When turned on, it traces SNA Transport internal
events; so, it is a useful tool for troubleshooting SNA Transport. Intrinsic
tracing is on a session basis and normally is turned
off. When turned on, it traces the send/receive interface between
SNA Transport and the SNA services. Because it includes the SNA
headers as well as the data, SNA Transport intrinsic tracing is
a useful tool for troubleshooting the SNA services. Both types of
SNA Transport tracing are turned on and off by using MPE commands.
The SDLC link driver also has a trace facility that is useful for
troubleshooting SDLC link-level problems; since it drains resources,
it normally is turned off. Link-level tracing is turned
on and off by using MPE commands. Tracing is described in
Chapter 5 "SNA Link Troubleshooting" of this manual;
the commands are described in Chapter 6 "MPE Commands"
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