Siemens DataNET Hub (DNH) user manual Trace Command

Command Descriptions, Continued

“trace” Command

The trace command controls the hub’s frame tracing function. This fea- ture captures network messages sent and received by the hub-half in that hub-half’s event buffer. The trace command controls which mes- sages are captured in the event buffer.

Trace messages may be collected for the Ethernet port, the cross-link port, any of the 8 downstream ports or the single upstream port. Trace data may be filtered to collect only input frames, output frames, or data frames (excluding protocol-only frames such as poll/acknowledge). The hub will not capture any frames until the “trace on” command is given.

Before issuing “trace on,” the user can set up trace filtering as described below. By default, tracing is set up for all frames on the Ethernet port.

To set up tracing, the trace command is followed by a list of ports and a filter mode. The port list is a comma-separated list, which may include any of:

Numerals “1” through “9”	The “downstream” ports are num-
	bered 1 through 8, and the upstream
	port is numbered 9.
ethernet	Specifies the Ethernet port
cross	Specifies the cross-link
The filter specification may be one of:
data	Trace all data frames (i.e., exclude
	frames that do not carry encapsu-
	lated Ethernet data).
input	Trace only input data frames.
output	Trace only output data frames
all	Trace all frames, including “protocol-
	only” frames on DataNET links.

The port and filter options may be commanded separately or combined into a single command:

trace ethernet all

sets up tracing for all frames on the Ethernet link.

trace 2 input

82 • Command Summary 2000585-001