Synonymous Flow Label Framework
RFC 8957
Document | Type | RFC - Proposed Standard (January 2021; No errata) | |
---|---|---|---|
Authors | Stewart Bryant , Mach Chen , George Swallow , Siva Sivabalan , Greg Mirsky | ||
Last updated | 2021-01-22 | ||
Replaces | draft-bryant-mpls-sfl-framework | ||
Stream | IETF | ||
Formats | plain text html xml pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Tarek Saad | ||
Shepherd write-up | Show (last changed 2020-09-16) | ||
IESG | IESG state | RFC 8957 (Proposed Standard) | |
Action Holders |
(None)
|
||
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Deborah Brungard | ||
Send notices to | Tarek Saad <tsaad.net@gmail.com> | ||
IANA | IANA review state | IANA OK - No Actions Needed | |
IANA action state | No IANA Actions |
Internet Engineering Task Force (IETF) S. Bryant Request for Comments: 8957 Futurewei Technologies Inc. Category: Standards Track M. Chen ISSN: 2070-1721 Huawei G. Swallow Southend Technical Center S. Sivabalan Ciena Corporation G. Mirsky ZTE Corp. January 2021 Synonymous Flow Label Framework Abstract RFC 8372 ("MPLS Flow Identification Considerations") describes the requirement for introducing flow identities within the MPLS architecture. This document describes a method of accomplishing this by using a technique called "Synonymous Flow Labels" in which labels that mimic the behavior of other labels provide the identification service. These identifiers can be used to trigger per-flow operations on the packet at the receiving label switching router. 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 https://www.rfc-editor.org/info/rfc8957. Copyright Notice Copyright (c) 2021 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction 2. Requirements Language 3. Synonymous Flow Labels 4. User Service Traffic in the Data Plane 4.1. Application Label Present 4.1.1. Setting TTL and the Traffic Class Bits 4.2. Single-Label Stack 4.2.1. Setting TTL and the Traffic Class Bits 4.3. Aggregation of SFL Actions 5. Equal-Cost Multipath Considerations 6. Privacy Considerations 7. Security Considerations 8. IANA Considerations 9. References 9.1. Normative References 9.2. Informative References Contributors Authors' Addresses 1. Introduction [RFC8372] ("MPLS Flow Identification Considerations") describes the requirement for introducing flow identities within the MPLS architecture. This document describes a method of providing the required identification by using a technique called "Synonymous Flow Labels (SFLs)" in which labels that mimic the behavior of other MPLS labels provide the identification service. These identifiers can be used to trigger per-flow operations on the packet at the receiving label switching router. 2. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. 3. Synonymous Flow Labels An SFL is defined to be a label that causes exactly the same behavior at the egress Label Edge Router (LER) as the label it replaces, except that it also causes one or more additional actions that have been previously agreed between the peer LERs to be executed on the packet. There are many possible additional actions, such as measuring the number of received packets in a flow, triggering an IP Flow Information Export (IPFIX) [RFC7011] capture, triggering other types of deep packet inspection, or identifying the packet source. For example, in a Performance Monitoring (PM) application, the agreed action could be recording the receipt of the packet by incrementing a packet counter. This is a natural action in many MPLS implementations, and where supported, this permits the implementation of high-quality packet loss measurement without any change to theShow full document text