Cisco VG30D, Руководство пользователя

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10-9
Cisco VG30D Voice Gateway User Guide
OL-19276-01
Chapter 10 Fault Determination
Diagnostic Procedures
Fatal Errors
Symptom
Unexpected restart; calls in progress may get lost, but the unit recovers within a couple of minutes. On
examination the unit appears to be functioning normally.
Cause
The software has detected an error that it cannot correct. The problem could be due to a catastrophic
hardware malfunction or a fault in the software.
Any permanent hardware failure gets discovered by the self-test function, and the unit will not be
returned to service. If the fault was transient, the unit reinitialises, clears any calls that may have been
left hanging, and resumes normal operation.
After they are properly installed, configured and operational, gateway units are extremely reliable.
Software-detected errors seldom occur. It is usually impossible to diagnose the causative factors. Unless
due to a persistent hardware problem, full recovery within a couple of minutes is automatic, although
calls in progress at the time of the failure will have been cleared.
Diagnostic action
The error gets recorded in the unit’s event log automatically. When the unit restarts, record the content
of the following logs:
•
System
•
Port
•
Major
•
Port Error
• Call Statistics
Event Reporting
Each Cisco VG30D Voice Gateway maintains an internal cyclic log of significant events and can report
the contents of this log to a terminal that is attached to the management port. During normal operation,
event reporting gets disabled, but when you are investigating problem conditions you can enable the
event reporting function to assist in fault diagnosis. Reports may get filtered by class and severity to
reduce the amount of information to be sifted.
If your supplier suggests that you do access the event log, they should tell you what classes of event to
filter. For most purposes, you only need to display Alarm conditions, but more detailed information also
gets maintained within the log in case of exceptional need. In practise, the most common faults are port
errors. These conditions normally get diagnosed from the status LEDs or the port alarm log without a
need to access the event log.
SNMP Traps
On a Cisco VG30D Voice Gateway that has been configured to use Ethernet, certain error conditions will
cause a Simple Network Management Protocol (SNMP) trap to be sent to a configured IP address. Up
to eight such addresses may be configured. These will contain basic information, but on receipt of the
trap, the user is intended to connect to the Cisco VG30D Voice Gateway unit by using the Gateway
management Interface for a more detailed summary. The following events will result in a trap being sent: