Residence Time Measurement in MPLS Networks (RFC8169)
Original Publication Date: 2017-May-01
Included in the Prior Art Database: 2017-Jun-01
Internet Society Requests For Comment (RFCs)
G. Mirsky: AUTHOR [+6]
Time synchronization protocols, e.g., the Network Time Protocol version 4 (NTPv4) [RFC5905] and the Precision Time Protocol version 2 (PTPv2) [IEEE.1588], define timing messages that can be used to synchronize clocks across a network domain. Measurement of the cumulative time that one of these timing messages spends transiting the nodes on the path from ingress node to egress node is termed "residence time" and is used to improve the accuracy of clock synchronization. Residence time is the sum of the difference between the time of receipt at an ingress interface and the time of transmission from an egress interface for each node along the network path from an ingress node to an egress node. This document defines a new Generic Associated Channel (G-ACh) value and an associated Residence Time Measurement (RTM) message that can be used in a Multiprotocol Label Switching (MPLS) network to measure residence time over a Label Switched Path (LSP).
Internet Engineering Task Force (IETF) G. Mirsky Request for Comments: 8169 ZTE Corp. Category: Standards Track S. Ruffini ISSN: 2070-1721 E. Gray Ericsson J. Drake Juniper Networks S. Bryant Huawei A. Vainshtein ECI Telecom May 2017
Residence Time Measurement in MPLS Networks
This document specifies a new Generic Associated Channel (G-ACh) for Residence Time Measurement (RTM) and describes how it can be used by time synchronization protocols within an MPLS domain.
Residence time is the variable part of the propagation delay of timing and synchronization messages; knowing this delay for each message allows for a more accurate determination of the delay to be taken into account when applying the value included in a Precision Time Protocol event message.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc8169.
Mirsky, et al. Standards Track [Page 1]
RFC 8169 Residence Time Measurement May 2017
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