Description of the problem

On a certain day, the customer feedback due to line reasons, one of the OSN 3500 equipment frequently occurs SNCP inversion, observe the history of alarm records, found that the inversion AU_AIS alarm inversion time and PS alarm time is not the same time, doubt OSN 3500 inversion time to meet the specifications of 50ms, feedback part of the alarm is as follows:

Important AU_AIS 07/13/2016 23:58:49 07/14/2016 00:05:12

Important AU_AIS 07/13/2016 23:58:49 07/14/2016 00:05:12

Important AU_AIS 07/13/2016 23:58:49 07/14/2016 00:05:12

Important AU_AIS 07/13/2016 23:58:49 07/14/2016 00:05:12

Important PS 07/13/2016 23:59:35 07/14/2016 00:15:49

Important PS 07/13/2016 23:59:35 07/14/2016 00:15:49

Important PS 07/13/2016 23:59:35 07/14/2016 00:15:49

Important PS 07/13/2016 23:59:35 07/14/2016 00:15:49

Looking at the alerts it looks like the PS alert time is reported about 1 minute later than the AU_AIS alert time.

Solution

1.PS for SNCP service protection reversal instruction alarm, when the service protection reversal occurs, the system will report the alarm, manual reversal and automatic reversal will report the alarm.

2. Does the point in time when the PS alarm is reported represent the point in time when SNCP is inverted?

After verifying that for OSN 3500 devices, the internal specification of the device is that the priority of SNCP switching action is higher and the priority of switching alarm reporting is lower, so the switching PS alarm will be set to delay reporting, that is to say, when SNCP switching occurs, the priority of the physical layer has been done for SNCP switching, and PS alarm has been done for 1 minute after the alarm timer is reported, so the difference between the above AU_AIS alarm and PS alarm is about 1 minute. alarm and PS alarm differ by about 1 minute.

3. How to check whether SNCP inversion has occurred?

You can view the relevant SNCP inversion events under the Network Management Fault - Browse Event Log menu, and every SNCP inversion made by the device will have the relevant inversion log records, as follows:

Important SNCP reversal CNBEJDEX7003M OptiX OSN 7500 07/29/2016 16:21:16

Important SNCP inversion CNBEJDEX7003M OptiX OSN 7500 07/29/2016 16:22:16

Important SNCP inversion CNBEJDEX7003M OptiX OSN 7500 07/29/2016 16:22:16

Important SNCP inversion CNBEJDEX7003M OptiX OSN 7500 07/29/2016 16:22:16

Important SNCP inversion CNBEJDEX7003M OptiX OSN 7500 07/29/2016 16:22:16

Important SNCP inversion CNSHHCJX7001M OptiX OSN 7500 07/29/2016 16:22:31

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