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ITU-T Y.1720 (09/2003)

Protection switching for MPLS networks

This Recommendation provides requirements and mechanisms for 1+1, 1:1, shared mesh, and packet 1+1 protection switching functionality for the user-plane in MPLS networks. The mechanism defined herein is designed to support end-to-end point-to-point LSPs. Protection switching functionality for multipoint-to-point and point-to-multipoint LSP are for further study. m:n protection switching is for further study. Hitless protection switching is outside the scope of this version of the Recommendation.

Citation:	https://handle.itu.int/11.1002/1000/6987
Series title:	Y series: Global information infrastructure, Internet protocol aspects, next-generation networks, Internet of Things and smart cities Y.1000-Y.1999: Internet protocol aspects Y.1700-Y.1799: Operation, administration and maintenance
Approval date:	2003-09-13
Approval process:	AAP
Status:	Superseded
Maintenance responsibility:	ITU-T Study Group 15
Further details:	Patent statement(s) Development history

Ed.	ITU-T Recommendation	Status	Summary	Table of Contents	Download
3.1	Y.1720 (2006) Amd. 1 (02/2008)	In force	here	-	here
3	Y.1720 (12/2006)	In force	here	here	here
2.2	Y.1720 (2003) Amd. 1 (08/2005)	Superseded	here	here	here
2.1	Y.1720 (2003) Cor. 1 (07/2005)	Superseded	here	-	here
2	Y.1720 (09/2003)	Superseded	here	here	here
2.0	Y.1720 (2003) Err. 1 (04/2004)	Superseded	-	-	here
1	Y.1720 (04/2003)	Superseded	here	here	here


ITU-T Supplement	Title	Status	Summary	Table of contents	Download
Y Suppl. 56 (12/2019)	ITU-T Y-series – Supplement on use cases of smart cities and communities	In force	here	here	here
Y Suppl. 68 (05/2021)	Framework for Internet of things ecosystem master plan	In force	here	here	here
Y Suppl. 69 (05/2021)	Web-based data model for Internet of things and smart city systems and services	In force	here	here	here
Y Suppl. 82 (07/2024)	Standardization gaps and roadmap for artificial intelligence and Internet of things in digital agriculture	In force	here	here	here
Y Suppl. 83 (07/2024)	Optimizing digital agriculture with best practices for integrating artificial intelligence and Internet of things	In force	here	here	here
Y Suppl. 96 (11/2025)	Machine learning standardization roadmap	In force	here	here	here
Y Suppl. 97 (11/2025)	Glossary of terms and definitions for machine learning	In force	here	-	here

Title	Approved on	Download
Multiple radio access technologies	2012	here

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ITU-T Recommendations

ITU-T Y.1720 (09/2003)