@misc{rfc8256, series = {Request for Comments}, number = 8256, howpublished = {RFC 8256}, publisher = {RFC Editor}, doi = {10.17487/RFC8256}, url = {https://www.rfc-editor.org/info/rfc8256}, author = {Alessandro D'Alessandro and Loa Andersson and Satoshi Ueno and Kaoru Arai and Yoshinori Koike}, title = {{Requirements for Hitless MPLS Path Segment Monitoring}}, pagetotal = 16, year = 2017, month = oct, abstract = {One of the most important Operations, Administration, and Maintenance (OAM) capabilities for transport-network operation is fault localization. An in-service, on-demand path segment monitoring function of a transport path is indispensable, particularly when the service monitoring function is activated only between endpoints. However, the current segment monitoring approach defined for MPLS (including the MPLS Transport Profile (MPLS-TP)) in RFC 6371 "Operations, Administration, and Maintenance Framework for MPLS-Based Transport Networks" has drawbacks. This document provides an analysis of the existing MPLS-TP OAM mechanisms for the path segment monitoring and provides requirements to guide the development of new OAM tools to support Hitless Path Segment Monitoring (HPSM).}, }