How Checkpoint Interface check??

Critical Device "Interface Active Check" on ClusterXL Member reports its state as "problem"

• Output of the "cphaprob state" command shows the state of the member as "Down" or "Active Attention" (instead of "Active" / "Standby").
  
• Output of the "cphaprob list" / "cphaprob -l list" command shows that Critical Device "Interface Active Check" reports its state as "problem".
  
• Output of the "cphaprob -a if" command shows one of the interfaces as "Inbound: DOWN" or as "Outbound: DOWN".
  
• Output of "grep interface /var/log/messages*" command shows that "Interface Active Check" is present.
  
• In SmartView Tracker, go to the "Network & Endpoint" tab - right-click on the "Information" column title - click on "Edit Filter..." - select "Specific" - in the "Field:", select "Contains" - in the text enter/paste the cluster_info - click on OK. There displayed logs with events for "Interface Active Check".
  
  
  
  To answer this question ,  we need to know how the Checkpoint check the interfaces?
  
  
  

VoLTE workflow

IMS = IP Multimedia SubSystem
It integrates the voice, data and multimedia services together and communicates with the access Network

NarrowBand – Internet of Things (NB-IoT)

NarrowBand-Internet of Things (NB-IoT) is a standards-based low power wide area (LPWA) technology developed to enable a wide range of new IoT devices and services. NB-IoT significantly improves the power consumption of user devices, system capacity and spectrum efficiency, especially in deep coverage. Battery life of more than 10 years can be supported for a wide range of use cases.
New physical layer signals and channels are designed to meet the demanding requirement of extended coverage – rural and deep indoors – and ultra-low device complexity. Initial cost of the NB-IoT modules is expected to be comparable to GSM/GPRS. The underlying technology is however much simpler than today’s GSM/GPRS and its cost is expected to decrease rapidly as demand increases.
Supported by all major mobile equipment, chipset and module manufacturers, NB-IoT can co-exist with 2G, 3G, and 4G mobile networks. It also benefits from all the security and privacy features of mobile networks, such as support for user identity confidentiality, entity authentication, confidentiality, data integrity, and mobile equipment identification. The first NB-IoT commercial launches have been completed and global roll out is expected for 2017/18.

NB-IoT Logo

November 22, 2017
Toolkit
GSMA

“NB-IoT” stands for “Narrow Band-Internet of Things”. It is a low power wide area radio technology standard published by 3GPP in Release 13 that addresses the requirements of the Internet of Things (IoT). The technology provides improved indoor and outdoor coverage, supports massive numbers of low throughput IoT devices, low delay sensitivity, ultra-low device cost, low device power consumption and optimised network architecture.
The NB-IoT ™ logo is designed for network operators and device, module & chipset manufacturers to market and promote NB-IoT technology and product. The NB-IoT™    logo has been developed for the GSMA NB-IoT Forum to enable members and other technology users to demonstrate their support for a unified global technology and to clearly label products and services using NB-IoT