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82 •••• Command Summary 2000585-001
Command Descriptions,
Continued
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
“trace” Command