Internet Engineering Task Force (IETF) A. Farrel
Request for Comments: 7054 Juniper Networks
Category: Informational H. Endo
ISSN: 2070-1721 Hitachi, Ltd.
R. Winter
NEC
Y. Koike
NTT
M. Paul
Deutsche Telekom
November 2013
Addressing Requirements and Design Considerations for
Per-Interface Maintenance Entity Group Intermediate Points (MIPs)
Abstract
The framework for Operations, Administration and Maintenance (OAM)
within the MPLS Transport Profile (MPLS-TP) describes how the
Maintenance Entity Group Intermediate Points (MIPs) may be situated
within network nodes at incoming and outgoing interfaces.
This document elaborates on important considerations for internal MIP
addressing. More precisely, it describes important restrictions for
any mechanism that specifies a way of forming OAM messages so that
they can be targeted at MIPs on either incoming or outgoing
interfaces and forwarded correctly through the forwarding engine.
Furthermore, the document includes considerations for node
implementations where there is no distinction between the incoming
and outgoing MIP.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
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). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
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/rfc7054.
Farrel, et al. Informational [Page 1]RFC 7054 Internal MIP Considerations November 2013Copyright Notice
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Table of Contents
1. Introduction ....................................................2
2. Terminology .....................................................3
3. Summary of the Problem Statement ................................3
4. Requirements and Design Considerations for Internal-MIP
Addressing ......................................................6
5. Security Considerations ........................................10
6. Acknowledgments ................................................10
7. References .....................................................10
7.1. Normative References ......................................10
7.2. Informative References ....................................11
1. Introduction
The framework for Operations, Administration and Maintenance (OAM)
within the MPLS Transport Profile (MPLS-TP)(the MPLS-TP OAM
Framework, [RFC6371]) distinguishes two configurations for the
Maintenance Entity Group Intermediate Points (MIPs) on a node. It
defines per-node MIPs and per-interface MIPs, where a per-node MIP is
a single MIP per node in an unspecified location within the node and
per-interface MIPs are two (or more) MIPs per node on each side of
the forwarding engine.
In-band OAM messages are sent using the Generic Associated Channel
(G-ACh) [RFC5586]. OAM messages for the transit points of
pseudowires (PWs) or Label Switched Paths (LSPs) are delivered using
the expiration of the MPLS shim header Time-to-Live (TTL) field. OAM
messages for the end points of PWs and LSPs are simply delivered as
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