We have discovered ISP devices in our environment & then there is complete site topology starting with core-router.
We have given criticality "4" to ISP & criticality "3" to our core-router.
Whenever there is disconnection from ISP side, we are not getting alarm on ISP router but we are getting alert on our core-router. While seeing events log it shows
"The VNM is unable to contact device GBUPMZRED0002R of type GnSNMPDev because all of the devices that this one is connected to are unreachable. An alarm will be generated but will be suppressed from the Alarm view."
Under VNM - Unresolved fault alarm disposition is set to "Device In Fault Domain"
Can anybody help to understand why it is happening.
The Spectrum documentation located at Fault Isolation Settings - CA Spectrum - 10.2 to 10.2.3 - CA Technologies Documentation states the following"
"If information about the connectivity of your network model is incomplete, CA Spectrum may be unable to find the root cause of a network outage. In this case, the status of all devices affected by the outage is set to gray, and a red unresolved fault alarm is generated. This alarm indicates that CA Spectrum has lost contact with a group of devices, but was unable to pinpoint the cause.
All of the devices to which CA Spectrum has lost contact are listed in the impact scope of the alarm. The model name and other details of the lost devices also appear in the event that generated the alarm."
So the modeling is important. Has the VNM lost connectivity to all the neighbors of the GBUPMZRED0002R model? Was an unresolved fault alarm asserted on any of the models in the Fault Domain or on the Fault Isolation model?
If there are additional questions I recommend opening a case with CA Spectrum Support so this may be looked into more thoroughly.