Corrected an issue in APM Resource Protection that resulted in NPM to APM heartbeat loss when the number of detected hosts exceeded 93.

Products

• XOS

Issue/Introduction

With APM-Resource-Protection configured and enabled and when more than 93 "detected hosts" are identified, there will be loss of dataplane heartbeats between the NPMs and APMs.

This issue is addressed in XOS 10.0.3 and XOS 11.0.0.

 

Cause

There is a software anomaly within the APM-Resource-Protection functionality of the Enhanced Resource Protection feature which writes past the end of a programmed buffer when there are more than 93 "detected hosts" resulting in the impact of heartbeat/health check mechanisms between the APM and NPM modules.

Resolution

Upgrade to a version of XOS containing the fix.  The fix was submitted to XOS 10.0.3 and XOS 11.0.0.    This software anomaly is not present in the XOS 9.7.x branch.

Workaround

Disable APM-Resource-Protection until the system is upgraded to a version containing the fix.