Hirschmann GREYHOUND GRS1020, Справочное руководство

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Operation diagnosis
13.6 Port event counter
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UM Config GRS
Release 8.0 09/2019
13.6 Port event counter
The port statistics table lets experienced network administrators identify possible detected
problems in the network.
This table displays the contents of various event counters. The packet counters add up the events
sent and the events received. In the Basic Settings > Restart dialog, you can reset the event counters.
Perform the following steps:
13.6.1 Detecting non-matching duplex modes
Problems occur when 2 ports directly connected to each other have mismatching duplex modes.
These problems are difficult to track down. The automatic detection and reporting of this situation
has the benefit of recognizing mismatching duplex modes before problems occur.
This situation arises from an incorrect configuration, for example, deactivatation of the automatic
configuration on the remote port.
A typical effect of this non-matching is that at a low data rate, the connection seems to be
functioning, but at a higher bi-directional traffic level the local device records a lot of CRC errors,
and the connection falls significantly below its nominal capacity.
The device lets you detect this situation and report it to the network management station. In the
process, the device evaluates the error counters of the port in the context of the port settings.
Possible causes of port error events
The following table lists the duplex operating modes for TX ports, with the possible fault events. The
meanings of terms used in the table are as follows:

Collisions
In half-duplex mode, collisions mean normal operation.

Duplex problem
Mismatching duplex modes.
Table 36: Examples indicating known weaknesses
Counter Indication of known possible weakness
Received fragments • Non-functioning controller of the connected device
• Electromagnetic interference in the transmission medium
CRC Error • Non-functioning controller of the connected device
• Electromagnetic interference in the transmission medium
• Inoperable component in the network
Collisions • Non-functioning controller of the connected device
• Network over extended/lines too long
• Collision or a detected fault with a data packet

To display the event counter, open the Basic Settings > Port dialog, Statistics tab.

To reset the counters, in the Basic Settings > Restart dialog, click the Clear port statistics
button.