Network Working Group M. Chen
Internet-Draft L. Zheng
Intended status: Standards Track Huawei Technologies Co., Ltd
Expires: November 13, 2011 May 12, 2011
ITU Carrier Code (ICC) Attachment Individual Identifier (AII)
draft-chen-pwe3-mpls-tp-aii-icc-00.txt
Abstract
This document defines a new Attachment Individual Identifier (AII)
type which could be used when ITU Carrier Code (ICC) is used as the
provider's globally unique identifier (Opr_ID). The new AII (ICC
AII) consists a ICC, a prefix and a AC ID field.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on November 13, 2011.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. ICC AII . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Procedures . . . . . . . . . . . . . . . . . . . . . . . . 4
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
4. Security Considerations . . . . . . . . . . . . . . . . . . . . 4
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 4
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.1. Normative References . . . . . . . . . . . . . . . . . . . 4
6.2. Informative References . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 5
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1. Introduction
[I-D.ietf-mpls-tp-identifiers] specifies two formats of Operator
Identifier (Opr_ID), uniquely identifying an operator in Multi-
Protocol Label Switching Transport Profile (MPLS-TP) networks. One
format is compatible with IP operational practice called a Global_ID
and anothor format compatible with ITU practice, the ITU Carrier Code
(ICC). The Opr_ID MAY use either the Global_ID or ICC format.
[RFC4447] defines the signaling mechanisms for establishing point-to-
point pseudowires (PWs) between two provider edge (PE) nodes. It
defines the format of the Generalized PWid FEC (FEC 129) and the use
and semantics of the Attachment Group Identifier (AGI) and Attachment
Individual Identifier (AII). Two types of AII have been defined.
AII Type 1 defined in [RFC6074] has a fixed-length 32-bit value that
is unique within the scope of the local Provider Edge (PE). AII Type
2 defined in [RFC5003] consists a 4-octct length Global ID, a 32-bit
prefix field and a 4-octet attachment circuit identifier (AC ID)
field. Existing AIIs do not support ICC based identifier.
This document defines a new AII type (ICC AII). It use a combination
of a 6-octet length ICC, a 4-octet length prefix and a 4-octet length
AC ID to create globally unique AII values.
2. ICC AII
ICC AII has the consistent structure with AII Type 2, which permits
varying levels of AII summarization to take place, thus reducing the
scaling burden on the AII distribution mechanisms and PE memory as
decribed in RFC5003 [RFC5003]. The encoding of ICC AII is as
follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| AII Type=03 | Length | ICC |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ICC (contd.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Prefix |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| AC ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1. ICC AII
AII Type: To be allocated by IANA (0x03 is recommended).
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Length: 1 octet in length, specifies the length of the value field in
octets. The length is set to 14.
ICC: 6 octets in length. As defined in M.1400, ICC is a string of
one to six characters. When the length of a ICC string is less than
6, the higher-order unused octets of the ICC field MUST be set to
zero.
Prefix: Same as [RFC5003].
AC ID field: Same as [RFC5003].
2.1. Procedures
Since the Opr_ID MAY use either the Global_ID or ICC format, the two
ends of a PW may use the diffrent AII type. During the Lable Mapping
procedure, one end may not map the Target Attachment Identifier (TAI
) to one of its Forwarders. In this case, it MUST send a Label
Release message to the other end, with a Status Code of "Unassigned/
Unrecognized TAI", and the processing of the Label Mapping message is
complete. In addition, for a specific PW, relevant PEs MUST use the
same type of identifiers.
3. IANA Considerations
IANA maintains a registry of "Attachment Individual Identifier (AII)
Type". This document request IANA to assign a new AII Type as
follows:
ICC AII: 0x03(TBD)
4. Security Considerations
This draft does not intrduce any new security issues, the security
mechanisms defined in [RFC5003] apply here.
5. Acknowledgements
6. References
6.1. Normative References
[I-D.ietf-mpls-tp-identifiers]
Bocci, M., Swallow, G., and E. Gray, "MPLS-TP
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Identifiers", draft-ietf-mpls-tp-identifiers-04 (work in
progress), March 2011.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC5003] Metz, C., Martini, L., Balus, F., and J. Sugimoto,
"Attachment Individual Identifier (AII) Types for
Aggregation", RFC 5003, September 2007.
6.2. Informative References
[RFC4447] Martini, L., Rosen, E., El-Aawar, N., Smith, T., and G.
Heron, "Pseudowire Setup and Maintenance Using the Label
Distribution Protocol (LDP)", RFC 4447, April 2006.
[RFC6074] Rosen, E., Davie, B., Radoaca, V., and W. Luo,
"Provisioning, Auto-Discovery, and Signaling in Layer 2
Virtual Private Networks (L2VPNs)", RFC 6074,
January 2011.
Authors' Addresses
Mach(Guoyi) Chen
Huawei Technologies Co., Ltd
No. 3 Xinxi Road, Shang-di, Hai-dian District
Beijing 100085
China
Email: mach@huawei.com
Lianshu Zheng
Huawei Technologies Co., Ltd
No. 3 Xinxi Road, Shang-di, Hai-dian District
Beijing 100085
China
Email: verozheng@huawei.com
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