RFC6003
Internet Engineering Task Force (IETF) D. Papadimitriou Request for Comments: 6003 Alcatel-Lucent Updates: 3471, 3473 October 2010 Category: Standards Track ISSN: 2070-1721
Ethernet Traffic Parameters
Abstract
This document describes the support of Metro Ethernet Forum (MEF) Ethernet traffic parameters as described in MEF10.1 when using Generalized Multi-Protocol Label Switching (GMPLS) Resource ReSerVation Protocol - Traffic Engineering (RSVP-TE) signaling.
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/rfc6003.
Copyright Notice
Copyright (c) 2010 IETF Trust and the persons identified as the document authors. All rights reserved.
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Contents
Introduction
Per RFC3471, Generalized Multi-Protocol Label Switching (GMPLS) allows the inclusion of technology-specific parameters in signaling. This document introduces Ethernet SENDER_TSPEC and FLOWSPEC-specific objects in support of Metro Ethernet Forum (MEF) Ethernet traffic parameters as specified in [MEF10.1] and ITU-T Ethernet Service Switching as discussed in RFC6004. For example:
o For Ethernet Private Line (EPL) services [MEF6], these traffic
parameters are applicable to each Ethernet Virtual Connection (EVC) crossing a given port.
o For Ethernet Virtual Private Line (EVPL) services [MEF6], these
traffic parameters are applicable per Ethernet Virtual Connection (EVC) with a single or multiple Class of Service (CoS), independent of its associated Virtual LAN ID (VID) or set of VIDs.
Association between EVC and VIDs is detailed in [MEF10.1]. The format and encoding of the VID (or set of VIDs) is documented in a companion document RFC6004.
This does not preclude broader usage of the Ethernet SENDER_TSPEC and FLOWSPEC-specific objects specified this document. For instance, they may also be used for signaling Ethernet Label Switched Paths (LSPs), in the Generalized Label Request (see RFC3471), the Switching Type field is set to Layer 2 Switching Capability (L2SC) and the LSP Encoding Type field to Ethernet.
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 RFC 2119 RFC2119.
Moreover, the reader is assumed to be familiar with the terminology in [MEF10.1] as well as in RFC3471 and RFC3473.
Overview
In GMPLS RSVP-TE RFC3473, the SENDER_TSPEC object is used on a Path message to indicate the bandwidth that is requested for the LSP being established, and the FLOWSPEC object is used on a Resv message to indicate the bandwidth actually reserved for the LSP. The Ethernet SENDER_TSPEC/FLOWSPEC object includes the Ethernet link type (switching granularity) of the requested LSP and the MTU value for
the LSP. Other information about the requested bandwidth characteristics of the LSP are carried in the Bandwidth Profile as a TLV within the Ethernet SENDER_TSPEC/FLOWSPEC object.
The Ethernet SENDER_TSPEC/FLOWSPEC object includes the Ethernet link type (switching granularity) of the requested LSP and the MTU value for the LSP.
The Bandwidth Profile defines the set of traffic parameters applicable to a sequence of Service Frames, referred to as bandwidth profile parameters (as specified in [MEF10.1]):
o Committed Rate: indicates the rate at which traffic commits to be
sent to the Ethernet LSP. The committed rate is described in terms of the CIR (Committed Information Rate) and CBS (Committed Burst Size) traffic parameters.
o CIR is defined as the average rate (in bytes per unit of time)
up to which the network is committed to transfer frames and
meets its performance objectives.
o CBS defines a limit on the maximum number of information units
(e.g., bytes) available for a burst of frames sent at the
interface speed to remain CIR-conformant.
o Excess Rate: indicates the extent by which the traffic sent on an
Ethernet LSP exceeds the committed rate. The Excess Rate is described in terms of the EIR (Excess Information Rate) and EBS (Excess Burst Size) traffic parameters.
o EIR is defined as the average rate (in bytes per unit of time),
in excess of the CIR, up to which the network may transfer
frames without any performance objectives.
o EBS defines a limit on the maximum number of information units
(e.g., bytes) available for a burst of frames sent at the
interface speed to remain EIR-conformant.
o Color mode (CM): indicates whether the "color-aware" or "color-
blind" property is employed by the bandwidth profile.
o Coupling flag (CF): allows the choice between two modes of
operation of the rate enforcement algorithm.
Ethernet SENDER_TSPEC Object
The Ethernet SENDER_TSPEC object (Class-Num = 12, Class-Type = 6) 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Length | Class-Num (12)| C-Type (6) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Switching Granularity | MTU | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ TLVs ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Switching Granularity (SG): 16 bits
This field indicates the type of link that comprises the requested Ethernet LSP.
The permitted Ethernet Link Type values are:
Value Switching Granularity
----- ---------------------
0 Provided in signaling. See RFC6004.
1 Ethernet Port (for port-based service)
2 Ethernet Frame (for EVC-based service)
255 Reserved
Values 0 to 2 are specified by the present document. Values 3 through 239 are to be assigned by IANA via Standards Action RFC5226. Value 255 is reserved by the present document (its Length is to be determined by the RFC that will specify it).
Values 240 through 254 are reserved for vendor-specific use.
Values 256 through 65535 are not assigned at this time.
MTU: 16 bits
This is a two-octet value indicating the MTU in octets.
The MTU field MUST NOT take a value smaller than 46 bytes for Ethernet v2 [ETHv2] and 38 bytes for IEEE 802.3 [IEEE802.3].
TLV (Type-Length-Value):
The Ethernet SENDER_TSPEC object MUST include at least one TLV and MAY include more than one TLV.
Each TLV MUST have 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ Value ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type: 16 bits
Defined values are:
Type Length Format Description
------------------------------------------------------
0 - Reserved Reserved value
1 - Reserved Reserved value
2 24 see Section 3.1 Ethernet Bandwidth
Profile [MEF10.1]
3 8 RFC6004 Layer 2 Control
Protocol (L2CP)
255 - Reserved Reserved value
Values 0, 1, and 255 are reserved by the present document. Values 2 and 3 are specified by the present document.
Values 4 through 239 are to be assigned by IANA via Standards Action RFC5226.
Values 240 through 254 are reserved for vendor-specific use.
Values 256 through 65535 are not assigned at this time.
Length: 16 bits
Indicates the length in bytes of the whole TLV including the Type and Length fields. A value field whose length is not a multiple of four MUST be zero-padded (with trailing zeros) so that the TLV is four-octet aligned.
Ethernet Bandwidth Profile TLV
The Type 2 TLV specifies the Ethernet Bandwidth Profile (BW profile). It defines an upper bound on the volume of the expected service frames belonging to a particular Ethernet service instance. The Ethernet SENDER_TSPEC object MAY include more than one Ethernet Bandwidth Profile TLV.
The Type 2 TLV 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Profile | Index | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | CIR | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | CBS | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | EIR | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | EBS | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Profile: 8 bits
This field is defined as a bit vector of binary flags. The following flags are defined:
Flag 1 (bit 0): Coupling Flag (CF)
Flag 2 (bit 1): Color Mode (CM)
Where bit 0 is the low order bit. Other flags are reserved, they SHOULD be set to zero when sent, and SHOULD be ignored when received.
A flag is set to value 1 to indicate that the corresponding metering profile is requested.
The Flag 1 (CF) allows the choice between two modes of operation of the rate enforcement algorithm.
The Flag 2 (CM) indicates whether the color-aware or color-blind property [MEF10.2] is employed by the bandwidth profile. When Flag 2 is set to value 0 (1), the bandwidth profile algorithm is said to be in color-blind (color-aware) mode.
Index: 8 bits
The Index field is used to reference bandwidth allocated for a given traffic class in case a multiple-class LSP is being requested. The Index field value MUST correspond to at least one of the Class-Type values included either in the CLASSTYPE object RFC4124 or in the EXTENDED_CLASSTYPE object [MCOS].
A given index value j can be associated to at most N Class-Type values CTi (i =< N) of the EXTENDED_CLASSTYPE object. This association applies when a set of one or more CTIs maps to a single (shared) BW profile. An example of value setting consists in assigning an arbitrary value comprised within the range [0x08,0xF8] associated to a set of CTi, the values in the range [0xF8,0xFF] being selected for reserved sets. This allows mapping to one of 248 predefined CTi sets.
A given index value j can be associated to a single CTi (1:1 correspondence). In this case, the index value setting consists in assigning the 3 least significant bits of the Index field itself to the CTi value itself (comprised in the range [0x00,0x07]). This applies in case a single CTi maps a single (dedicated) BW profile or multiple (dedicated) BW profiles. In the former case, the Ethernet SENDER_TSPEC object includes a single Ethernet Bandwidth Profile TLV. In the latter case, the Ethernet SENDER_TSPEC includes a set of more than one Ethernet Bandwidth Profile TLVs (whose respective index value is associated to a single CTi value).
Note that the current specification allows for combining shared and dedicated BW profiles to the same LSP. That is, an Ethernet SENDER_TSPEC object MAY include multiple Ethernet Bandwidth Profile TLVs whose respective index can be associated on a 1:1 basis to a single CTi or to a set of multiple CTis.
For each subobject of the EXTENDED_CLASSTYPE object [MCOS]:
o Each CTi value SHOULD correspond 1:1 to the MEF Customer
Edge VLAN CoS (CE-VLAN CoS).
o The BW requested per CTi field MAY be used for bandwidth
accounting purposes.
By default, the value of the Index field MUST be set to 0.
Reserved: 16 bits
These bits SHOULD be set to zero when sent and MUST be ignored when received.
CIR (Committed Information Rate): 32 bits
The value of the CIR is in units of bytes per second. The CIR is encoded as a 32-bit IEEE single-precision floating-point number (see RFC4506).
The CIR value MUST be greater than or equal to 0.
CBS (Committed Burst Size): 32 bits
The value of the CBS is in units of bytes. The CBS is encoded as a 32-bit IEEE single-precision floating-point number (see RFC4506).
When CIR is strictly greater than 0 (CIR > 0), the CBS MUST be greater than or equal to the maximum frame size.
EIR (Excess Information Rate): 32 bits
The value of the EIR is in units of bytes per second. The EIR is encoded as a 32-bit IEEE single-precision floating-point number (see RFC4506).
The EIR value MUST be greater than or equal to 0.
EBS (Excess Burst Size): 32 bits
The value of the EBS is in units of bytes. The EBS is encoded as a 32-bit IEEE single-precision floating-point number (see RFC4506).
When EIR is strictly greater than 0 (EIR > 0), the EBS MUST be greater than or equal to the maximum frame size.
Ethernet FLOWSPEC Object
The Ethernet FLOWSPEC object (Class-Num = 9, Class-Type = 6) has the same format as the Ethernet SENDER_TSPEC object.
Ethernet ADSPEC Object
There is no ADSPEC object associated with the Ethernet SENDER_TSPEC object.
Either the ADSPEC object is omitted or an IntServ ADSPEC with the Default General Characterization Parameters and Guaranteed Service fragment is used, see RFC2210.
Processing
The Ethernet SENDER_TSPEC and FLOWSPEC objects specified in this document MAY be used for signaling Ethernet LSP. For signaling such an LSP, in the Generalized LABEL_REQUEST object (see RFC3471), the Switching Type field MUST be set to the value 51 (L2SC) and the LSP Encoding Type field MUST be set to the value 2 (Ethernet).
The Ethernet SENDER_TSPEC object carries the traffic specification generated by the RSVP session sender. The Ethernet SENDER_TSPEC object SHOULD be forwarded and delivered unchanged to both intermediate and egress nodes.
The Ethernet FLOWSPEC object carries reservation request information generated by receivers. As with any FLOWSPEC object, the Ethernet FLOWSPEC object flows upstream toward the ingress node.
Intermediate and egress nodes MUST verify that the node itself and the interfaces on which the LSP will be established can support the requested Switching Granularity, MTU and values included in subobject TLVs. These nodes MUST be configured with the same predefined CT sets as the index value signaled as part of the Index field of the Ethernet Bandwidth Profile TLV (see Section 4.1). If the requested value(s) cannot be supported, the receiver node MUST generate a PathErr message with the error code "Traffic Control Error" and the error value "Service unsupported" (see RFC2205).
In addition, if the MTU field is received with a value smaller than the minimum transfer unit size of the Ethernet frame (e.g., 46 bytes for Ethernet v2, 38 bytes for IEEE 802.3), the node MUST generate a PathErr message with the error code "Traffic Control Error" and the error value "Bad Tspec value" (see RFC2205).
Error processing of the CLASSTYPE object follows rules defined in RFC4124. Error processing of the EXTENDED_CLASSTYPE object follows rules defined in [MCOS]. Moreover, a Label Switching Router (LSR) receiving a Path message with the EXTENDED_CLASSTYPE object, which recognizes the object and the particular Class-Type but does detect a mismatch in the index values, MUST send a PathErr message towards the sender with the error code "Extended Class-Type Error" and the error value "Class-Type mismatch" (see RFC2205).
Security Considerations
This document introduces no new security considerations to RFC3473.
GMPLS security is described in Section 11 of RFC3471 and refers to RFC3209 for RSVP-TE. Further details of MPLS-TE and GMPLS security can be found in RFC5920.
IANA Considerations
IANA maintains registries and sub-registries for RSVP-TE as used by GMPLS. IANA has made allocations from these registries as set out in the following sections.
RSVP Objects Class Types
This document introduces two new Class Types for existing RSVP objects. IANA has made allocations from the "Resource ReSerVation Protocol (RSVP) Parameters" registry using the "Class Names, Class Numbers, and Class Types" sub-registry.
Class Number Class Name Reference
----------------------- ---------
9 FLOWSPEC RFC2205
Class Type (C-Type):
6 Ethernet SENDER_TSPEC RFC6003
Class Number Class Name Reference
----------------------- ---------
12 SENDER_TSPEC RFC2205
Class Type (C-Type):
6 Ethernet SENDER_TSPEC RFC6003
Ethernet Switching Granularities
IANA maintains a registry of GMPLS parameters called "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Parameters".
IANA has created a new sub-registry called "Ethernet Switching Granularities" to contain the values that may be carried in the Switching Granularity field of the Ethernet SENDER_TSPEC object.
Values are as follows:
0-2 See below. 3-239 Unassigned 240-254 Reserved for Vendor-Specific Use 255 Reserved 256-65535 Not assigned at this time
The registration procedure is Standards Action.
Initial entries in this sub-registry are as follows:
Value Switching Granularity Reference
-------------------------------------- ------------------
0 Provided in signaling. RFC6003RFC6004 1 Ethernet Port (for port-based service) RFC6003 2 Ethernet Frame (for EVC-based service) RFC6003
255 Reserved RFC6003
Ethernet Sender TSpec TLVs
IANA maintains a registry of GMPLS parameters called "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Parameters".
IANA has created a new sub-registry called "Ethernet Sender TSpec TLVs / Ethernet Flowspec TLVs" to contain the TLV type values for TLVs carried in the Ethernet SENDER_TSPEC object.
Values are as follows:
0-3 See below. 4-239 Unassigned 240-254 Reserved for Vendor-Specific Use 255 Reserved 256-65535 Not assigned at this time
The registration procedure is Standards Action.
Initial entries in this sub-registry are as follows:
Type Description Reference
-------------------------------- ---------
0 Reserved RFC6003 1 Reserved RFC6003 2 Ethernet Bandwidth Profile RFC6003 3 Layer 2 Control Protocol (L2CP) RFC6003
255 Reserved RFC6003
Ethernet Bandwidth Profiles
IANA maintains a registry of GMPLS parameters called "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Parameters".
IANA has created a new sub-registry called "Ethernet Bandwidth Profiles" to contain bit flags carried in the Ethernet Bandwidth Profile TLV of the Ethernet SENDER_TSPEC object.
Bits are to be allocated by IETF Standards Action. Bits are numbered from bit 0 as the low order bit. Initial entries are as follows:
Bit Hex Description Reference --- ---- -------------------------- -------------
0 0x01 Coupling Flag (CF) RFC6003 1 0x02 Color Mode (CM) RFC6003
10. Acknowledgments
Many thanks to Adrian Farrel for his comments. Lou Berger provided the input on control traffic processing.
11. References
11.1. Normative References
[MEF10.1] The MEF Technical Specification, "Ethernet Services
Attributes Phase 2", MEF 10.1, November 2006.
RFC2205 Braden, R., Ed., Zhang, L., Berson, S., Herzog, S., and S.
Jamin, "Resource ReSerVation Protocol (RSVP) -- Version 1
Functional Specification", RFC 2205, September 1997.
RFC2210 Wroclawski, J., "The Use of RSVP with IETF Integrated
Services", RFC 2210, September 1997.
RFC2119 Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
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.
RFC3471 Berger, L., Ed., "Generalized Multi-Protocol Label
Switching (GMPLS) Signaling Functional Description", RFC
3471, January 2003.
RFC3473 Berger, L., Ed., "Generalized Multi-Protocol Label
Switching (GMPLS) Signaling Resource ReserVation Protocol-
Traffic Engineering (RSVP-TE) Extensions", RFC 3473,
January 2003.
RFC4124 Le Faucheur, F., Ed., "Protocol Extensions for Support of
Diffserv-aware MPLS Traffic Engineering", RFC 4124, June 2005.
RFC4506 Eisler, M., Ed., "XDR: External Data Representation
Standard", STD 67, RFC 4506, May 2006.
RFC5226 Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226, May 2008.
RFC6004 Berger, L. and D. Fedyk, "Generalized MPLS (GMPLS) Support
for Metro Ethernet Forum and G.8011 Ethernet Services",
RFC 6004, October 2010.
11.2. Informative References
[ETHv2] Digital, Intel, and Xerox, "The Ethernet -- A Local Area
Network: Data Link Layer and Physical Layer
Specifications", Version 2.0, November 1982.
[IEEE802.3]
IEEE 802.3 LAN/MAN CSMA/CD (Ethernet) Access Method, IEEE
Standard for Information technology- Specific requirements
- Part 3: Carrier Sense Multiple Access with Collision
Detection (CMSA/CD) Access Method and Physical Layer
Specifications, IEEE 802.3-2008.
[MCOS] Minei, I., Gan, D., Kompella, K., and X. Li, "Extensions
for Differentiated Services-aware Traffic Engineered
LSPs", Work in Progress, June 2006.
[MEF6] The Metro Ethernet Forum, "Ethernet Services Definitions -
Phase I", MEF 6, June 2004.
[MEF10.2] The MEF Technical Specification, "Ethernet Services
Attributes Phase 2", MEF 10.2, October 2009.
RFC5920 Fang, L., Ed., "Security Framework for MPLS and GMPLS
Networks", RFC 5920, July 2010.
Author's Address
Dimitri Papadimitriou Alcatel-Lucent Bell Copernicuslaan 50 B-2018 Antwerpen, Belgium Phone: +32 3 2408491 EMail: [email protected]
