3, general troubleshooting steps for switch failure: such as
Fault switch diversity, different faults have different forms. Failure analysis to the various
phenomena of flexibility in the
use of elimination method (such as the exclusion of hair,comparative method, substitution method), locate the faults, and excluded in a timely manner.
(1) elimination
method:
When we
face failure phenomena and analyze problems, inadvertently will have learned to use exclusion method to determine the fault direction. This method refers to the fault phenomenonon the basis of the observed, as comprehensive as possible to enumerate all possible faults,and then analyzed, excluding. In the rule to
follow is simplicity to complexity, improve the efficiency of. Fault using this method can deal
with all kinds of maintenance
personnel, but needstrong logical thinking, have a comprehensive understanding to exchange knowledge.
(2) contrast
method:
The
so-called contrast method, is to use existing, the same model and to
the normal operation of the switch as a reference object, make the comparison between the switch and fault, so as tofind the point of failure. The method is simple and effective, especially the fault systemconfiguration, simply compare can identify
different point configuration, but sometimes to findmodels of the same configuration, the same switch is not an easy thing.
(3) the
replacement method:
This is the most commonly used method, method is used
frequently in the repair of computer.Replacement method refers to replace faulty components use may switch components of normal, to find the fault point. It is mainly used for hardware diagnostics, but need
to pay attention to is, replacement
parts must be the same brand, same type of similar switch caixing.
Of course, in order to make the pilot work of rule-based, we can in the fault analysis, in accordance with the following principles to analyze.
1, from
far to near
Because of
the general applause switch (such as: port fault) are discovered
by the connectionfrom the client computer, so often to check. We can
follow the client computer - > port module - > horizontal cable - > jumper - > switch such a route, inspect, first remove the remote fault may.
2, from
outside to inside
If the
switch faults exist, we can first light from the various external, then according to the fault indicator, then check whether the corresponding components of internal problems. For example,the POWER LED light indicates the power supply is normal, put out that no power supply; LINKLEDs yellow said it the connection in 10Mb/s, green is 100 Mb/s, extinguished said there was noconnection, flashes that port is closed manually administrator RDP LED
said; redundant power supply; MGMT LED
said the administrator module. Whether from the outside of the fault lies,must log switch to determine the specific problem, and troubleshooting measures.
3, from
soft to hard
Failure, who do not want to touch the screwdriver to open the switch again, so at
the time of the inspection, always
start with the system
configuration or system software to check. If the
software does not solve the
problem, and that is hardware problem. For example, a port
is notgood, we can check the user connection port is not in
the corresponding VLAN, or whether the port is to shut down the rest of the administrator, or configuration for other reasons. If theexclusion of various system and configuration may be, it can be suspected that the real problem-- a hardware failure.
4, from
easy to difficult
In the face
of failure analysis is more complex, must start from the simple operation or configuration to exclude. This can speed up the speed of troubleshooting, improve efficiency.
Summary:
As a result
of a variety of switch failure phenomenon of diversity, there is no fixed rule steps,and
some failures tend to have a clear direction, can identify. So can
only be based on theconcrete analysis of concrete conditions. So need to improve yourself, to complete the task of network management better.
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