Use of The IPv4 Reserved-flag for OAM
draft-aghule-intarea-oam-01
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INTAREA Working Group A. Ghule
Internet-Draft R. Bonica
Intended status: Experimental Juniper Networks
Expires: February 8, 2020 August 7, 2019
Use of The IPv4 Reserved-flag for OAM
draft-aghule-intarea-oam-01
Abstract
This document defines new IPv4 Operations and Management (OAM)
capabilities. In order to support these capabilities, this document
defines a new interpretation of the IPv4 Reserved-flag.
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 February 8, 2020.
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
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.
Ghule & Bonica Expires February 8, 2020 [Page 1]
Internet-Draft IPv4 OAM August 2019
Table of Contents
1. Problem Statement . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 2
3. Redefining the IPv4 Reserved-Bit . . . . . . . . . . . . . . 2
4. OAM Flag Processing . . . . . . . . . . . . . . . . . . . . . 3
4.1. At Network Ingress Nodes . . . . . . . . . . . . . . . . 3
4.2. At Network Interior Nodes . . . . . . . . . . . . . . . . 3
4.3. At Network Egress Nodes . . . . . . . . . . . . . . . . . 4
5. The ICMP OAM Message . . . . . . . . . . . . . . . . . . . . 4
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
7. Security Considerations . . . . . . . . . . . . . . . . . . . 6
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 6
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
9.1. Normative References . . . . . . . . . . . . . . . . . . 6
9.2. Informative References . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
1. Problem Statement
This document defines new IPv4 [RFC0791] Operations and Management
(OAM) capabilities. In order to support these capabilities, this
document defines a new interpretation of the IPv4 Reserved-flag.
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. Redefining the IPv4 Reserved-Bit
0 1 2
+---+---+---+
| | D | M |
| 0 | F | F |
+---+---+---+
Figure 1: Current Defintion Of The IPv4 Flags Field
Figure 1 depicts the IPv4 Flags field, as defined in [RFC0791]. It
contains the following fields:
o Bit 0: reserved, must be zero
o Bit 1: (DF) 0 = May Fragment, 1 = Don't Fragment.
Ghule & Bonica Expires February 8, 2020 [Page 2]
Internet-Draft IPv4 OAM August 2019
o Bit 2: (MF) 0 = Last Fragment, 1 = More Fragments.
0 1 2
+---+---+---+
| O | D | M |
| A | F | F |
| M | | |
+---+---+---+
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