Manual
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14.4 DDM Troubleshooting 
If problems occur when configuring DDM, please check whether the problem is caused by the 
following reasons: 
  Ensure that the transceiver of the fiber module has been inserted fast on the port, or 
else DDM configuration will not be shown. 
  Ensure that SNMP configuration is valid, or else the warning event cannot inform the 
network management system. 
  Because  only  some  boards  and  box  switches  support  SFP  with  DDM  or  XFP  with 
DDM, ensure the used board and switch support the corresponding function. 
  When using show transceiver command or show transceiver detail command, it cost 
much time due to the switch will check  all ports, so it is recommended to query the 
monitoring information of the transceiver on the specified port. 
  Ensure  the  threshold  defined  by  the  user  is  valid.  When  any  threshold  is  error,  the 
transceiver will give an alarm according to the default setting automatically. 










