Internet Draft Lou Berger (LabN) Updates: 3471, 3473, 3945, 4202, 4203, 5307 Don Fedyk (Alcatel-Lucent) Category: Standards Track Expiration Date: July 19, 2010 January 19, 2010 Generalized MPLS (GMPLS) Data Channel Switching Capable (DCSC) and Channel Set Label Extensions draft-ietf-ccamp-gmpls-dcsc-channel-ext-03.txt 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), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. 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." The list of current Internet-Drafts can be accessed at http://www.ietf.org/1id-abstracts.html The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html This Internet-Draft will expire on July 19, 2010. Copyright and License Notice Copyright (c) 2010 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 Berger & Fedyk Standards Track [Page 1]
Internet-Draft draft-ietf-ccamp-gmpls-dcsc-channel-ext-03.txt January 19, 2010 described in the Simplified BSD License. Abstract This document describes two technology-independent extensions to Generalized Multi-Protocol Label Switching. The first extension defines the new switching type Data Channel Switching Capable. Data Channel Switching Capable interfaces are able to support switching of the whole digital channel presented on single channel interfaces. The second extension defines a new type of generalized label and updates related objects. The new label is called the Generalized Channel_Set Label and allows more than one data plane label to be controlled as part of an LSP. Table of Contents 1 Introduction ........................................... 3 1.1 Conventions used in this document ...................... 3 2 Data Channel Switching ................................. 3 2.1 Compatibility .......................................... 4 3 Generalized Channel_Set Label Related Formats .......... 4 3.1 Generalized Channel_Set LABEL_REQUEST Object ........... 5 3.2 Generalized Channel_Set LABEL Object ................... 5 3.3 Other Label related Objects ............................ 7 3.4 Compatibility .......................................... 8 4 IANA Considerations .................................... 8 4.1 Data Channel Switching Type ............................ 8 4.2 Generalized Channel_Set LABEL_REQUEST Object ........... 8 4.3 Generalized Channel_Set LABEL Object ................... 9 5 Security Considerations ................................ 9 6 References ............................................. 9 6.1 Normative References ................................... 9 6.2 Informative References ................................. 10 7 Acknowledgments ........................................ 11 8 Author's Addresses ..................................... 11 Berger & Fedyk Standards Track [Page 2]
Internet-Draft draft-ietf-ccamp-gmpls-dcsc-channel-ext-03.txt January 19, 2010 1. Introduction This document describes two technology independent extensions to Generalized Multi-Protocol Label Switching (GMPLS). Both of these extensions were initially defined in the context of Ethernet services, see [GMPLS-ESVCS] and [GMPLS-MEF-UNI], but are generic in nature and may be useful to any switching technology controlled via GMPLS. The first extension defines a new switching type, which is called Data Channel Switching Capable (DCSC). DCSC interfaces are able to support switching of the whole digital channel presented on single channel interfaces. The second extension defines a new type of generalized label and updates related objects. The new label is called the Generalized Channel_Set Label and allows more than one data plane label to be controlled as part of a GMPLS label-switched path (LSP). 1.1. Conventions used in this document 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 [RFC2119]. 2. Data Channel Switching Current GMPLS switching types are defined in [RFC3945] and [RFC3471] and support switching at the packet (PSC), frame (L2SC), time-slot (TDM), frequency (LSC) and fiber (FSC) granularities. Parallel definitions for these switching types are also made in [RFC4202], [RFC4203] and [RFC5307]. One type of switching that is not well represented in this current set is switching that occurs when all data received on an ingress port is switched through a network to an egress port. While there are similarities between this level of switching and the "opaque single wavelength" case described in Section 3.5 of [RFC4202], such port-to-port switching is not limited to the optical switching technology implied by the LSC type. FSC is also similar, but it is restricted to fiber ports and also supports multiple data channels within a fiber port. This document defines a new switching type called Data Channel Switching Capable (DCSC). Port switching seems a more intuitive name, but this naming collides with PSC so is not used. DCSC interfaces are able to support switching of the whole digital channel presented on single channel interfaces. Interfaces that inherently support multiple channels, e.g., WDM and channelized TDM interfaces, are specifically excluded from this type. Any interface that can be Berger & Fedyk Standards Track [Page 3]
Internet-Draft draft-ietf-ccamp-gmpls-dcsc-channel-ext-03.txt January 19, 2010 represented as a single digital channel are included. Examples include concatenated TDM and line encoded interfaces. Framed interfaces may also be included when they support switching on an interface granularity. DCSC is represented in GMPLS, see [RFC3471] and [RFC4202], using the value TBA (by IANA). The DCSC value is carried in routing protocols in the Interface Switching Capability Descriptor defined in [RFC4202], and used in OSPF [RFC4203] and IS-IS [RFC5307]. These documents are not otherwise modified by this document. The DCSC Switching Type may be used with the Generalized Label Request object, [RFC3473], or the Generalized Channel_Set LABEL_REQUEST Object defined below. Port labels, as defined in [RFC3471], SHOULD be used for LSPs signaled using the DCSC Switching Type. 2.1. Compatibility Transit and egress nodes that do not support the DCSC Switching Type when receiving a Path message with a Label Request containing the DCSC Switching Type will behave in the same way nodes generally handle the case of an unsupported Switching Type. Specifically, per [RFC3473], such nodes are required to generate a PathErr message, with a "Routing problem/Unsupported Encoding" indication. Ingress nodes initiating a Path message containing a Label Request containing the DCSC Switching Type, receiving such a PathErr messages, then notify the requesting application user as appropriate. 3. Generalized Channel_Set Label Related Formats This section defines a new type of generalized label and updates related objects. This section updates the label related definitions of [RFC3473]. The ability to communicate more than one label as part of the same LSP was motivated by the support for the communication of one or more VLAN IDs. Simple concatenation of labels as is done in [RFC4606] was deemed impractical given the large number of VLAN IDs (up to 4096) that may need to be communicated. The formats defined in this section are not technology specific and may be useful for other switching technologies. The LABEL_SET object defined in [RFC3473] serves as the foundation for the defined formats. Berger & Fedyk Standards Track [Page 4]
Internet-Draft draft-ietf-ccamp-gmpls-dcsc-channel-ext-03.txt January 19, 2010 3.1. Generalized Channel_Set LABEL_REQUEST Object The Generalized Channel_Set LABEL_REQUEST object is used to indicate that the Generalized Channel_Set LABEL Object is to be used with the associated LSP. The format of the Generalized Channel_Set LABEL_REQUEST object is the same as the Generalized LABEL_REQUEST object and uses a C-Type of TBA. 3.2. Generalized Channel_Set LABEL Object The Generalized Channel_Set LABEL Object communicates one or more labels, all of which can be used equivalently in the data path associated with a single LSP. The format of the Generalized Channel_Set LABEL Object is based on the LABEL_SET object defined in [RFC3473]. It differs from the the LABEL_SET object in that the full set may be represented in a single object rather than the multiple objects required by the [RFC3473] LABEL_SET object. The object MUST be used on LSPs that use the Generalized Channel_Set LABEL_REQUEST object. The object MUST be processed per [RFC3473]. Make-before- break procedures, see [RFC3209], SHOULD be used when modifying the Channel_Set LABEL object. The format of the Generalized Channel_Set LABEL object is: o Generalized Channel_Set LABEL object: Class = 16, C-Type = TBA (By IANA) 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Channel_Set Sub-Object 1 | | ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : : : : : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Channel_Set Sub-Object N | | ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Berger & Fedyk Standards Track [Page 5]
Internet-Draft draft-ietf-ccamp-gmpls-dcsc-channel-ext-03.txt January 19, 2010 The Channel_Set Sub-Object size is measured in bytes and MUST always be a multiple of 4, and at least 4, and has the following format: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action | Num Subchannels | Label Type | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Subchannel 1 | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ... | : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : : : : : : : : : : : : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Subchannel N | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ... | Padding | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Action: 8 bits See [RFC3471] for definition of actions. Range actions SHOULD be used when possible to minimize the size of the Channel_Set LABEL Object. Number of Subchannels: 10 bits Indicates the number of subchannels carried in the sub-object. When the number of subchannels required exceeds the limit of the field, i.e., 1024, multiple Channel_Set Sub-Objects MUST be used. Note that the size of the sub-object may result in a Path message being larger than a single unfragmented IP packet. See section 4.4 for an example of how this case may be handled. A value of zero (0) has special meaning and MAY be used in either the LABEL or UPSTREAM_LABEL object. A value of zero (0) is used in a LABEL or UPSTREAM_LABEL object to indicate that the subchannel(s) used in the corresponding (downstream or upstream) direction MUST match the subchannel(s) carried in the reverse directions label object. When value of zero (0) is used, no Subchannels are included in the Channel_Set Sub-Object and only one Channel_Set Sub-Object may be present. The zero (0) value MUST NOT be used in both the LABEL and UPSTREAM_LABEL objects of the same LSP. Note that unacceptable label values continue to be handled according to [RFC3209] and [RFC3473], i.e., they result in PathErr or ResvErr messages with a "Routing problem/Unacceptable label value" indication. For example, in the case where a Resv message containing a zero (0) Berger & Fedyk Standards Track [Page 6]
Internet-Draft draft-ietf-ccamp-gmpls-dcsc-channel-ext-03.txt January 19, 2010 in both the LABEL and UPSTREAM_LABEL objects is received, the node would generate a ResvErr message. Label Type: 14 bits See [RFC3473] for a description of this field. Subchannel: Variable See [RFC3471] for a description of this field. Note that this field might not be 32 bit aligned. Padding: Variable Padding is used to ensure that the length of a Channel_Set Sub- Object meets the multiple of 4 byte size requirement stated above. The field is only required when the Subchannel field is not 32 bit aligned and the number of included Subchannel fields result in the Sub-Object not being 32 bit aligned. The Padding field MUST be included when the number of bits represented in all the Subchannel fields included in a Generalized Channel_Set Sub-Object result in the Sub-Object not being 32 bit aligned. When present, the Padding field MUST have a length that results in the Sub-Object being 32 bit aligned. When present, the Padding field MUST be set to a zero (0) value on transmission and MUST be ignored on receipt. These bits SHOULD be passed through unmodified by transit nodes. 3.3. Other Label related Objects The previous section introduced a new LABEL object. As such the formats of the other label related objects are also impacted. Processing of these objects is not modified and remains per their respective specifications. The other label related objects are defined in [RFC3473] and include: - SUGGESTED_LABEL object - LABEL_SET object - ACCEPTABLE_LABEL_SET object - UPSTREAM_LABEL object - RECOVERY_LABEL object Berger & Fedyk Standards Track [Page 7]
Internet-Draft draft-ietf-ccamp-gmpls-dcsc-channel-ext-03.txt January 19, 2010 3.4. Compatibility Transit and egress nodes that do not support the Generalized Channel_Set Label related formats will first receive a Path message containing Generalized Channel_Set LABEL_REQUEST object. When such a node receives the Path message, per [RFC3209], it will send a PathErr with the error code "Unknown object C_Type". Ingress nodes initiating a Path message containing a Generalized Channel_Set LABEL_REQUEST object on receiving such a PathErr messages, then notify the requesting application user as appropriate. 4. IANA Considerations IANA is requested to administer assignment of new values for namespaces defined in this document and summarized in this section. 4.1. Data Channel Switching Type Upon approval of this document, IANA will make the assignment in the "Switching Types" section of the "GMPLS Signaling Parameters" registry located at http://www.iana.org/assignments/gmpls-sig- parameters: Value Type Reference ----- --------------------------- --------- 125* Data Channel Switching Capable (DCSC) [This document] (*) Suggested value. It should be noted that the assigned value should be reflected in IANAGmplsSwitchingTypeTC at http://www.iana.org/assignments/ianagmplstc-mib. 4.2. Generalized Channel_Set LABEL_REQUEST Object Upon approval of this document, IANA will make the assignment in the "Class Names, Class Numbers, and Class Types" section of the "RSVP PARAMETERS" registry located at http://www.iana.org/assignments/rsvp- parameters. Berger & Fedyk Standards Track [Page 8]
Internet-Draft draft-ietf-ccamp-gmpls-dcsc-channel-ext-03.txt January 19, 2010 A new class type for the existing LABEL_REQUEST Object class number (19) with the following definition: Class Types or C-Types: 5* Generalized Channel_Set [This document] (*) Suggested value. 4.3. Generalized Channel_Set LABEL Object Upon approval of this document, IANA will make the assignment in the "Class Names, Class Numbers, and Class Types" section of the "RSVP PARAMETERS" registry located at http://www.iana.org/assignments/rsvp- parameters. A new class type for the existing RSVP_LABEL Object class number (16) with the following definition: Class Types or C-Types: 4* Generalized Channel_Set [This document] (*) Suggested value. 5. Security Considerations This document introduces new message object formats for use in GMPLS signaling [RFC3473]. It does not introduce any new signaling messages, nor change the relationship between LSRs that are adjacent in the control plane. As such, this document introduces no additional security considerations. See [RFC3473] for relevant security considerations. Additionally, the existing framework for MPLS and GMPLS security is documented in [MPLS-SEC]. 6. References 6.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels," RFC 2119. [RFC3209] Awduche, D., Berger, L., Gan, D., Li, T., Srinivasan, V. and G. Swallow, "RSVP-TE: Extensions to RSVP for LSP Tunnels", RFC 3209, December 2001. Berger & Fedyk Standards Track [Page 9]
Internet-Draft draft-ietf-ccamp-gmpls-dcsc-channel-ext-03.txt January 19, 2010 [RFC3471] Berger, L., Editor, "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Functional Description", RFC 3471, January 2003. [RFC3473] Berger, L., Editor, "Generalized Multi-Protocol Label Switching (GMPLS) Signaling - Resource ReserVation Protocol-Traffic Engineering (RSVP-TE) Extensions", RFC 3473, January 2003. [RFC3945] Mannie, E., Editor, "Generalized Multi-Protocol Label Switching (GMPLS) Architecture", RFC 3945, October 2004. [RFC4202] Kompella, K., Ed., and Y. Rekhter, Ed., "Routing Extensions in Support of Generalized Multi-Protocol Label Switching (GMPLS)", RFC 4202, October 2005. [RFC4203] Kompella, K. and Y. Rekhter, "OSPF Extensions in Support of Generalized Multi-Protocol Label Switching (GMPLS)", RFC 4203, October 2005. [RFC5307] Kompella, K. and Rekhter, Y., "IS-IS Extensions in Support of Generalized Multi-Protocol Label Switching (GMPLS)", RFC 5307, October 2008. 6.2. Informative References [GMPLS-ESVCS] Berger, L., Fedyk, D., "Generalized MPLS (GMPLS) Support For Metro Ethernet Forum and G.8011 Ethernet Service Switching", Work in Progress, draft-ietf-ccamp-gmpls-ether-svcs. [GMPLS-MEF-UNI] Berger, L., Fedyk, D., "Generalized MPLS (GMPLS) Support For Metro Ethernet Forum and G.8011 User-Network Interface (UNI)", Work in Progress, draft-ietf-ccamp-gmpls-mef-uni. [MPLS-SEC] Fang, L., et al, "Security Framework for MPLS and GMPLS Networks", Work in Progress, draft-ietf-mpls-mpls-and-gmpls-security-framework. [RFC4606] Mannie, E., et al "Generalized Multi-Protocol Label Switching (GMPLS) Extensions for Synchronous Optical Network (SONET) and Synchronous Digital Hierarchy (SDH) Control", RFC 4606, August 2006. Berger & Fedyk Standards Track [Page 10]
Internet-Draft draft-ietf-ccamp-gmpls-dcsc-channel-ext-03.txt January 19, 2010 7. Acknowledgments Dimitri Papadimitriou provided substantial textual contributions to this document and coauthored earlier versions of this document. The authors would like to thank Evelyne Roch, Stephen Shew, and Adrian Farrel for their valuable comments. 8. Author's Addresses Lou Berger LabN Consulting, L.L.C. Phone: +1-301-468-9228 Email: lberger@labn.net Don Fedyk Alcatel-Lucent Groton, MA, 01450 Phone: +1-978-467-5645 Email: donald.fedyk@alcatel-lucent.com Berger & Fedyk Standards Track [Page 11]
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