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Cisco MGX 8850 Multiservice Switch Installation and Configuration
Release 1.1.31, Part Number 78-11223-03 Rev. B0, May 2005
Chapter 6 Card and Service Configuration
Online Diagnostics Test
14. DDS-4 pattern
15. DDS-5 pattern
16. 2
9
pattern
17. 2
11
pattern
Loopback Test Options
The loopback tests do not monitor the integrity of the data but rather the integrity of the path. The type
of loopback indicates the direction of test data transmission. The choices are:
• far end—Service module transmits data to the CPE and receives the data back
• remote—Service module receives data from the CPE and loops back to the CPE
• metallic—Service module receives data from the network and loops it back to the network
Online Diagnostics Test
The Online Diagnostics are used to test components on the PXM1 and SRM modules of the MGX 8850
while the shelf is running. Connections, states, and tasks are not affected by the tests.
The diagnostic test is invoked from the active PXM1. If a standby PXM1 exists and is in standby state,
it will also be tested. When the test is run, each component is checked and the results are presented on
the screen. Results are also saved to a log file.
Automatic Switchover
The Online Diagnostic command (oldiags) includes an option to automatically switch operations from
the active PXM1 to the standby PXM1 if a major problem is detected. This behavior is possible only
when a standby PXM1 is installed and no errors are detected on that standby PXM1 during the test.
Alarms
If a failure is detected and an automatic switchover is not performed, a major alarm is set. This alarm is
displayed in the card Major Alarm Bit Map field when the command dspcd is entered. The alarm
message indicates the failed PXM1 by slot.
Note Note: Certain hardware failures prevent alarms from being set. Use the log files and screen display
to determine if a failure has occurred.
Log Files
Each time the diagnostics are run, the results are logged in a file on the PXM1 drive. If a standby PXM1
exists, a separate log file is written to that disk and must be viewed separately.
• The log files on the active PXM1 also indicate if a failure occurred on the standby PXM1.
• Only the three most recent log files are retained. If three files exist and a new test is run, the oldest
log file is overwritten by the new file.
• Log files are named onlinediag.MONTHDAY_hh:mm. The files are saved in C:DIAG.