PTP monitoring in redundant network

Abstract

Redundant Ethernet topologies such as Rapid Spanning Tree Protocol (RSTP), High-availability Seamless Redundancy (HSR) and Parallel Redundancy Protocol (PRP) are used in automation systems. Commonly Precision Time Protocol (PTP) is used to synchronize nodes in such networks. The redundant topology can be utilized to monitor PTP functionality - such as to detect asymmetries, non-functional devices and to help during installation and operation.