Here are the examples to solve the fault of the Cisco swith, hope can help you!
Fault (1)
Failure phenomenon: the opening of a new station, some users in the cisco Switch outgoing calls, oftencall is not successful, statistical monitoring traffic, find out the call loss is too large, nearly 30%, and no branch.
Failure analysis: the fault phenomenon can not determine the fault is software or hardware failure, no comparable reference device, it is not possible to use comparison method andsubstitution method, can only use the law to exclude treatment.
Because of the failure and call related, has nothing to do with the user, the call will not affectother users, so users can exclude the factor of the circuit and switching system. But according to the call flow, can be analysed and outgoing call related hardware user circuit,inter office system relay circuit, receiving decoder and exchange, and outgoing call softwaresystem related user data, interoffice data and sending code field data. On the basis of this,from simple to complex principle, first bureau is a relay circuit testing, the results did not findany problems, then the receiving code for testing, found that nearly 25% of the receiving codeis not used, and are concentrated in the same module. But these cannot check the Bureaudata set according to the number of transceiver decoder, and did not find any problems, this can be sure, the fault belongs to hardware problems (are concentrated in the same module).Then the hardware module and the connected
The equipment was examined, and using the comparative method, there will be a normal work module and the receiving code cannot be used to send and receive decoder module is compared, it was found to be the control circuit board model is not correct. The control circuit board to be the replacement of the correct type, fault is excluded.
Fault (2)
Fault phenomenon: a bureau of a central processor module cannot run in dual state,returned by the manual input dual command information, the central processor modulestandby side does not work; diagnostic command on the reserve side for prompt diagnosis is, alternate side part of circuit board is not normal.
Fault analysis: the failure of the fault obviously belongs to the hardware. Then according to the fault information tips, first using the substitution method, circuit board will alternate side to replace. However, circuit board after the replacement, fault phenomenon did not disappear.That is to say, the fault point really not on the alternate side circuit board, causes the reserveside of the fault, there may be a frame, module, power supply and connecting equipmentetc.. Then with the exclusion of these equipment gradually investigation, especially thecentral processor module work instructions, carefully analyze the process from single todouble, and by artificial hair dual command, the main side receives the data first, then the main sides of the main control circuit board set to alternate side transmits, let be used sideself etc.. This process such as alternate side of the normal, will revert the main side, and to receive the master side information to prepare. Such as the main side received spare normalreply, will to the alternate side current data transmission, to achieve double operation.However, the question now is, the main side received no spare normal recovery information.What is the reason? Is the main side doesn't have to spare side issued instructions or anormal dual standby recovery information for use side not received? The transfer with theprimary side of the main control circuit board. Therefore, the restart, main and standbyequipment forced conversion of central processor module, and the replacement of theoriginal with the side of the main control circuit, fault phenomenon disappeared.
The type of this fault is the damage of circuit board fault.
Fault (3)
Fault phenomenon: a bureau of urban property set interoffice relay circuit facilities, butinstalled on the hardware facilities, errors in input data, namely appeared the Bureau data storage state error.
Fault analysis: the fault according to the fault type, apparently for software fault, is unable to use the replacement method. Therefore, according to the principle of from simple to complex, the first use of the comparative method, namely, print out the data relevantcompared with his bureau, good found suspicious point in a memory management table.Because the data memory management table is in accordance with the starting address,end address, storage space, the remaining space management. But numerical than storage space numerical the memory management table space remaining a lot, obviously is the datamanagement problem. Then use the machine code modification command, adjusted thedata memory management table, preclude the fault, the Bureau data to normal operation.
Conclusion
The fault phenomena are various, the fault reason is various, the same fault, fault phenomenon may have many different. The same fault phenomena, may also have many different reasons. For example, fault user circuit board, which can be showed as users without the buzz, murmur, wrong number, can also be expressed as a single pass, no ring.Moreover, the same is the user no buzz phenomenon, it may also be due to the frame of bad contact, the user module has a problem or exchange system problems. So, ask when infault analysis, must as far as possible the comprehensive, detailed understanding of faultphenomena and flexibly use the method of fault analysis. At the same time, to do a good jobof recording, analysis, every fault sort and record the whole process, so as to accumulate experience, and continuously Cisco Catalyst 2960 improve the level of fault handling.
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