IANA Registry for P-Multicast Service Interface (PMSI) Tunnel Type Code Points
Register and allocate code points for BGP multicast tunnel types
Andersson, L. and G. Swallow, "IANA Registry for P-Multicast Service Interface (PMSI) Tunnel Type Code Points", RFC 7385, DOI 10.17487/RFC7385, October 2014, <https://www.rfc-editor.org/info/rfc7385>.
@misc{rfc7385,
series = {Request for Comments},
number = 7385,
howpublished = {RFC 7385},
publisher = {RFC Editor},
doi = {10.17487/RFC7385},
url = {https://www.rfc-editor.org/info/rfc7385},
author = {L. Andersson and G. Swallow},
title = {{IANA Registry for P-Multicast Service Interface (PMSI) Tunnel Type Code Points}},
pagetotal = 4,
year = 2014,
month = oct,
} RFC text
Contents
Internet Engineering Task Force (IETF) L. Andersson
Request for Comments: 7385 Huawei Technologies
Updates: 6514 G. Swallow
Category: Standards Track Cisco Systems
ISSN: 2070-1721 October 2014
IANA Registry for P-Multicast Service Interface (PMSI)
Tunnel Type Code Points
Abstract
RFC 6514 created a space of Tunnel Type code points for a new BGP
attribute called the "P-Multicast Service Interface Tunnel (PMSI
Tunnel) attribute". However, the RFC did not create a corresponding
IANA registry.
There now is need to make further code point allocations from this
name space. This document serves to update RFC 6514 in that it
creates an IANA registry for that purpose.
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 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/rfc7385.
Copyright Notice
Copyright (c) 2014 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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Security Considerations . . . . . . . . . . . . . . . . . . . 3
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
4. References . . . . . . . . . . . . . . . . . . . . . . . . . 3
4.1. Normative References . . . . . . . . . . . . . . . . . . 3
4.2. Informative References . . . . . . . . . . . . . . . . . 4
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4
1. Introduction
In 'BGP Encodings and Procedures for Multicast in MPLS/BGP IP VPNs'
[RFC6514], an optional transitive BGP attribute called the
"P-Multicast Service Interface Tunnel (PMSI Tunnel) attribute" is
specified. This BGP attribute uses an octet field to specify the
PMSI tunnel type. RFC 6514 allocates the values 0-7.
There is now a need to make further code point allocations from this
name space. In particular, "Inter-Area P2MP Segmented LSPs"
[SEAMLESS-MCAST] needs to make such an allocation. However, the RFC
did not create an IANA registry for these code points.
This document creates a new IANA registry called "P-Multicast Service
Interface Tunnel (PMSI Tunnel) Tunnel Types" for these code points.
The registry is created in the "Border Gateway Protocol (BGP)
Parameters" registry.
Creating this registry is an update of RFC 6514 [RFC6514].
2. Security Considerations
This document simply creates an IANA registry from a table in RFC
6514. Thus, there are no security concerns.
3. IANA Considerations
IANA has created a new registry called "P-Multicast Service Interface
Tunnel (PMSI Tunnel) Tunnel Types" in the "Border Gateway Protocol
(BGP) Parameters" registry.
The allocation policy for values 0x00 to 0xFA is IETF Review
[RFC5226]. Values 0xFB to 0xFE are experimental and are not to be
assigned. 0xFF is reserved, the status of 0xFF may only be changed
through Standards Action [RFC5226].
The initial registry should appear as:
Value Meaning Reference
0x00 no tunnel information present [RFC6514]
0x01 RSVP-TE P2MP LSP [RFC6514]
0x02 mLDP P2MP LSP [RFC6514]
0x03 PIM-SSM Tree [RFC6514]
0x04 PIM-SM Tree [RFC6514]
0x05 BIDIR-PIM Tree [RFC6514]
0x06 Ingress Replication [RFC6514]
0x07 mLDP MP2MP LSP [RFC6514]
0x08 - 0xFA Unassigned
0xFB - 0xFE Experimental [RFC7385]
0xFF Reserved [RFC7385]
Figure 1
4. References
4.1. Normative References
[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226,
May 2008, <http://www.rfc-editor.org/info/rfc5226>.
[RFC6514] Aggarwal, R., Rosen, E., Morin, T., and Y. Rekhter, "BGP
Encodings and Procedures for Multicast in MPLS/BGP IP
VPNs", RFC 6514, February 2012,
<http://www.rfc-editor.org/info/rfc6514>.
4.2. Informative References
[SEAMLESS-MCAST]
Rekhter, Y. and R. Aggarwal, "Inter-Area P2MP Segmented
LSPs", Work in Progress, draft-ietf-mpls-seamless-
mcast-14, July 2014.
Acknowledgements
The authors want to thank Adrian Farrel for unwavering support and
our L3VPN, MPLS, and IDR co-chairs for swift processing of this
document.
Authors' Addresses
Loa Andersson
Huawei Technologies
EMail: loa@mail01.huawei.com
George Swallow
Cisco Systems
EMail: swallow@cisco.com
AI ELI5
On this page
§1The Missing Registry
RFC 6514 introduced the BGP P-Multicast Service Interface Tunnel (PMSI Tunnel) attribute, which uses an 8-bit Tunnel Type field to specify the type of multicast tunnel (RSVP-TE P2MP, mLDP P2MP, PIM-SSM, and others). RFC 6514 assigned the values 0-7 but did not create an IANA registry.
As new tunnel types were needed—particularly for Inter-Area P2MP Segmented LSPs—there was no official way to allocate code points or document them.
The old document gave out the first few numbers but never set up an official place to record new ones.
§2The Registry
A new IANA registry is created in the Border Gateway Protocol (BGP) Parameters registry, named "P-Multicast Service Interface Tunnel (PMSI Tunnel) Tunnel Types". The initial values (0x00-0x07) from RFC 6514 are included.
Allocation policy: values 0x00 to 0xFA use IETF Review (allocation by standards action), values 0xFB to 0xFE are experimental and not assigned, and 0xFF is reserved. Only 0xFF can change its status through Standards Action.
The official list starts with the types from the old document. New ones follow a clear process. Some numbers are saved for experiments.
§3Tunnel Types
The initial registry includes: no tunnel information present, RSVP-TE P2MP LSP, mLDP P2MP LSP, PIM-SSM Tree, PIM-SM Tree, BIDIR-PIM Tree, Ingress Replication, and mLDP MP2MP LSP (from RFC 6514). Values 0x08 to 0xFA are unassigned and available for allocation.
The list covers the main tunnel types already defined and leaves room for future ones.
§4Status
RFC 7385 creates the registry that was missing from RFC 6514. The registry enables standardized allocation of new tunnel type code points. It was updated by RFC 8317 and RFC 8338.
Now there is an official place to record new tunnel types as they are needed.