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A Simple Control Protocol for MPLS SFLs

Document Type Replaced Internet-Draft (mpls WG)
Expired & archived
Authors Stewart Bryant , George Swallow , Siva Sivabalan
Last updated 2020-12-07
Replaced by draft-ietf-mpls-sfl-control
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Additional resources Mailing list discussion
Stream WG state Candidate for WG Adoption
Document shepherd Loa Andersson
IESG IESG state Replaced by draft-ietf-mpls-sfl-control
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to Loa Andersson <>, <>

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


In draft-ietf-mpls-sfl-framework the concept of MPLS synonymous flow labels (SFL) was introduced. This document describes a simple control protocol that runs over an associated control header to request, withdraw, and extend the lifetime of such labels. It is not the only control protocol that moght be used to support SFL, but it has the benefit of being able to be used without modifying of the existing MPLS control prodocols. The existance of this design is not intended to restrict the ability to enhance an existing MPLS control protocol to add a similar capability. A Querier MUST wait a configured time (suggested wait of 60 seconds) before re-attempting a Withdraw request. No more than three Withdraw requests SHOULD be made. These restricctions are to prevent overloading the control plane of the actioning router.


Stewart Bryant
George Swallow
Siva Sivabalan

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)