Forwarding and Control Element Separation (ForCES) Inter-FE Logical Functional Block (LFB)
RFC 8013
| Document | Type |
RFC - Proposed Standard
(February 2017; Errata)
Was draft-ietf-forces-interfelfb (individual in rtg area)
|
|
|---|---|---|---|
| Last updated | 2020-01-21 | ||
| Replaces | draft-joachimpillai-forces-interfelfb | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized with errata bibtex | ||
| Reviews | |||
| Stream | WG state | WG Document | |
| Document shepherd | Evangelos Haleplidis | ||
| Shepherd write-up | Show (last changed 2016-06-22) | ||
| IESG | IESG state | RFC 8013 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Alia Atlas | ||
| IESG note | Draft to finish after forces WG has closed. | ||
| Send notices to | (None) | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) D. Joachimpillai
Request for Comments: 8013 Verizon
Category: Standards Track J. Hadi Salim
ISSN: 2070-1721 Mojatatu Networks
February 2017
Forwarding and Control Element Separation (ForCES)
Inter-FE Logical Functional Block (LFB)
Abstract
This document describes how to extend the Forwarding and Control
Element Separation (ForCES) Logical Functional Block (LFB) topology
across Forwarding Elements (FEs) by defining the inter-FE LFB class.
The inter-FE LFB class provides the ability to pass data and metadata
across FEs without needing any changes to the ForCES specification.
The document focuses on Ethernet transport.
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/rfc8013.
Copyright Notice
Copyright (c) 2017 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
(http://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.
Joachimpillai & Hadi Salim Standards Track [Page 1]
RFC 8013 ForCES Inter-FE LFB February 2017
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology and Conventions . . . . . . . . . . . . . . . . . 3
2.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2.2. Definitions . . . . . . . . . . . . . . . . . . . . . . . 3
3. Problem Scope and Use Cases . . . . . . . . . . . . . . . . . 4
3.1. Assumptions . . . . . . . . . . . . . . . . . . . . . . . 4
3.2. Sample Use Cases . . . . . . . . . . . . . . . . . . . . 4
3.2.1. Basic IPv4 Router . . . . . . . . . . . . . . . . . . 4
3.2.1.1. Distributing the Basic IPv4 Router . . . . . . . 6
3.2.2. Arbitrary Network Function . . . . . . . . . . . . . 7
3.2.2.1. Distributing the Arbitrary Network Function . . . 8
4. Inter-FE LFB Overview . . . . . . . . . . . . . . . . . . . . 8
4.1. Inserting the Inter-FE LFB . . . . . . . . . . . . . . . 8
5. Inter-FE Ethernet Connectivity . . . . . . . . . . . . . . . 10
5.1. Inter-FE Ethernet Connectivity Issues . . . . . . . . . . 10
5.1.1. MTU Consideration . . . . . . . . . . . . . . . . . . 10
5.1.2. Quality-of-Service Considerations . . . . . . . . . . 11
5.1.3. Congestion Considerations . . . . . . . . . . . . . . 11
5.2. Inter-FE Ethernet Encapsulation . . . . . . . . . . . . . 12
6. Detailed Description of the Ethernet Inter-FE LFB . . . . . . 13
6.1. Data Handling . . . . . . . . . . . . . . . . . . . . . . 13
6.1.1. Egress Processing . . . . . . . . . . . . . . . . . . 14
6.1.2. Ingress Processing . . . . . . . . . . . . . . . . . 15
6.2. Components . . . . . . . . . . . . . . . . . . . . . . . 16
6.3. Inter-FE LFB XML Model . . . . . . . . . . . . . . . . . 17
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 21
8. IEEE Assignment Considerations . . . . . . . . . . . . . . . 21
9. Security Considerations . . . . . . . . . . . . . . . . . . . 22
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 23
10.1. Normative References . . . . . . . . . . . . . . . . . . 23
10.2. Informative References . . . . . . . . . . . . . . . . . 24
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 25
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 25
1. Introduction
In the ForCES architecture, a packet service can be modeled by
composing a graph of one or more LFB instances. The reader is
referred to the details in the ForCES model [RFC5812].
The ForCES model describes the processing within a single Forwarding
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