Controlled Return Path for Service Function Chain (SFC) OAM
draft-ao-sfc-oam-return-path-specified-03
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SFC WG T. Ao
Internet-Draft ZTE Corporation
Intended status: Standards Track G. Mirsky
Expires: September 11, 2019 ZTE Corp.
Z. Chen
China Telecom
March 10, 2019
Controlled Return Path for Service Function Chain (SFC) OAM
draft-ao-sfc-oam-return-path-specified-03
Abstract
This document defines extensions to the Service Function Chain (SFC)
Operation, Administration and Maintenance (OAM) that enable control
of the Echo Reply return path by specifying it as Reverse Service
Function Path. Enforcing the specific return path can be used to
verify bidirectional connectivity of SFC and increase the robustness
of SFC OAM.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 11, 2019.
Copyright Notice
Copyright (c) 2019 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
Ao, et al. Expires September 11, 2019 [Page 1]
Internet-Draft Controlled Return Path for SFC OAM March 2019
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
2. Conventions used in this document . . . . . . . . . . . . . . 3
2.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2.2. Requirements Language . . . . . . . . . . . . . . . . . . 3
3. Extension . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. SFC Reply Path TLV . . . . . . . . . . . . . . . . . . . . . 4
5. Theory of Operation . . . . . . . . . . . . . . . . . . . . . 5
5.1. Bi-directional SFC Case . . . . . . . . . . . . . . . . . 5
6. Security Considerations . . . . . . . . . . . . . . . . . . . 5
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
7.1. SFC Return Path Type . . . . . . . . . . . . . . . . . . 6
7.2. New Return Codes . . . . . . . . . . . . . . . . . . . . 6
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.1. Normative References . . . . . . . . . . . . . . . . . . 6
8.2. Informative References . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
1. Introduction
While Service Function Chain (SFC) Echo Request, defined in
[I-D.ietf-sfc-multi-layer-oam], always traverses the SFC it directed
to, the corresponding Echo Reply is sent over IP network
[I-D.ietf-sfc-multi-layer-oam]. There are scenarios when it is
beneficial to direct the responder to use a path other than the IP
network. This document defines extensions to the Service Function
Chain (SFC) Operation, Administration and Maintenance (OAM) that
enable control of the Echo Reply return path by specifying it as
Reply Service Function Path. This document defines a new Type-
Length-Value (TLV), Reply Service Function Path TLV, for Reply via
Specified Path mode of SFC Echo Reply (Section 4).
The Reply Service Function Path TLV can provide an efficient
mechanism to test SFCs,such as bidirectional and hybrid SFC, as these
were defined in Section 2.2 [RFC7665]. For example, it allows an
operator to test both directions of the bidirectional or hybrid SFP
with a single SFC Echo Request/Echo Reply operation.
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