Extreme Networks ExtremeWare Version 7.8, Troubleshooting Manual

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96 Advanced System Diagnostics and Troubleshooting Guide
Additional Diagnostics Tools
Network Impact of the Syslog Server Facility
Network impact depends on the volume of log messages sent to the syslog server. But even under
extreme conditions, the relative brevity of log messages means that even a very large message volume
should not adversely affect network throughput.
Cable Diagnostics
The cable diagnostics provided in ExtremeWare are to assist in detecting severe cable problems
including, but not limited to, the following:
• A cable not properly terminated at the link partner
• An open circuit and the distance to the point where the open circuit occurs
• A short circuit between the conductors in a single twisted-pair and the distance to the point where
the short circuit occurs
Cable Diagnostics for the High-Density Gigabit Ethernet I/O Modules
in “
i ” Series Switches
ExtremeWare provides a set of cable diagnostics, referred to as the Cable Diagnostics Module or CDM,
to test cables attached to the physical ports on the High-Density Gigabit Ethernet modules (also known
as “
3 ” series I/O modules) in the Alpine 3800 series and the BlackDiamond 6800 series chassis-based
systems.
The CDM tests can be run on any cable connected to a port on a High-Density Gigabit Ethernet module.
The cable can be open at the far end, or it can be plugged into a port on the far-end device acting as the
link partner.
Depending on the status of the cable and its connections, the CDM tests proceed this way:
•
When the Gigabit link cannot be established, the CDM tests use time domain reflectometry (TDR) to
diagnose cable faults. The results of the diagnostic test are then interpreted to determine the type of
cable fault and—when applicable—the approximate distance to the cable fault.
• When the Gigabit link can be established, the CDM tests report additional status information on pair
skew, pair swap, polarity swap, and approximate cable length.
Related Commands
run diagnostics cable port [<portlist> | all]
abort diagnostics cable
configure diagnostics cable time <time> {reset-port-on-failure [enable | disable]}
enable diagnostics cable port [<portlist> | all]
disable diagnostics cable port [<portlist> | all]
show diagnostics cable {ports {<portlist> | all}} {mode {auto | manual | both}}
{detail}
NOTE
These commands apply only to the High-Density Gigabit Ethernet modules (also known as “3” series
I/O modules) in the Alpine 3800 series and the BlackDiamond 6800 series chassis-based systems.