Network Working Group Dimitri Papadimitriou Internet Draft Category: Informational
Expires: April 2007 October 2006MEF Ethernet Traffic Parameters draft-ietf-ccamp-ethernet-traffic-parameters-01.txtdraft-ietf-ccamp-ethernet-traffic-parameters-02.txt Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of 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/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. For potential updates to the above required-text see: http://www.ietf.org/ietf/1id-guidelines.txt This Internet-Draft will expire on November 2007. Copyright Notice Copyright (C) The IETF Trust (2007). Abstract This document described the Metro Ethernet Forum (MEF) - specific Ethernet Traffic Parameters as described in MEF.10 when using Generalized Multi-Protocol Label Switching (GMPLS) Resource ReSerVation Protocol - Traffic Engineering (RSVP-TE) signaling. MEF Ethernet Traffic Parameters October 2006Conventions 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 . Moreover, the reader is assumed to be familiar with the terminology MEF.10 as well as [RFC3471] and [RFC3473]. 1. Introduction Per [RFC3471], GMPLS allows the inclusion of technology specific parameters in signaling. Ethernet SENDER_TSPEC and FLOWSPEC specific objects are introduced in this document that describes Metro Ethernet Forum (MEF) Ethernet traffic parameters as specified in [MEF.10]. These traffic parameters MUST be used when L2SC is specified in the LSP Switching Type field of a Generalized Label Request (see [RFC3471]) and the LSP encoding type is Ethernet. For Ethernet Private Line (EPL) services [MEF.6], these traffic parameters are applicable non-discriminately to all EVCs crossing a given port. For Ethernet Virtual Private Line (EVPL) services [MEF.6], these traffic parameters are applicable per Ethernet Virtual Connection (EVC) with single of multiple Class of Service (CoS), independently of its associated (set of) VLAN ID (VID). Association between EVC and VIDs is detailed in [MEF.10]. The format and encoding of the (set of) VIDs are documented in a companion document [MEF-SRV]. 2. Overview The Ethernet SENDER_TSPEC/FLOWSPEC object includes the Ethernet link type (switching granularity) of the requested LSP, and the MTU value for the LSP. As the Bandwidth Profile defines the set of traffic parameters applicable to a sequence of Service Frames, these objects MAY also include several bandwidth profile parameters such as: - Committed Rate: defines 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. 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 performance objectives. 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. - Excess Rate: defines the extent by which the traffic sent on a 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. EIR is defined as the average rate (in bytes per unit of time), MEF Ethernet Traffic Parameters October 2006in excess of the CIR, up to which the network may transfer frames without any performance objectives. 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. - The color mode (CM) parameter indicates whether the "color- aware" or "color-blind" property is employed by the bandwidth profile. - The coupling flag (CF) parameter allows the choice between two modes of operations of the rate enforcement algorithm. 3. Ethernet SENDER_TSPEC object The Ethernet SENDER_TSPEC object (Class-Num = 12, Class-Type = TBA by IANA) 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: Value Switching Granularity ----- --------------------- 1 Ethernet Port (for port-based service) 2 Ethernet Frame (for EVC-based service) Value 0 is reserved. Values 1 through 127 are assigned by IANA via IETF Standards Track RFC action. Values 128 through 255 are reserved for vendor specific usage. MEF Ethernet Traffic Parameters October 2006MTU: 16 bits This is a two-octet value indicating the MTU in octets. The MTU MUST NOT take a value smaller than 46 bytes for Ethernet v2 and 38 bytes for IEEE 802.3. TLV: The Ethernet SENDER_TSPEC object MUST include at least one TLV and MAY include one or more than one TLV. Each 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ Value ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Length: 16 bits Indicates the total length of the TLV, i.e., 4 + the length of the value field in octets. 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. Type: 16 bits Defined values are: Type Length Format Description -------------------------------------------------- 128 20TBD Reserved Reserved 129 24 see below Ethernet Bandwidth Profile [MEF10] Value 0 is reserved. Values 1 through 127 are assigned by IANA via IETF Standards Track RFC Action. Values 128 through 255 are reserved for vendor specific usage. MEF Ethernet Traffic Parameters October 20063.1 Ethernet Bandwidth Profile TLV Type 129 TLV indicates the Ethernet Bandwidth 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 129 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 to be registered by IANA) This field is defined as a vector of binary flags. The following flags are defined: Flag 1 (bit 1):0): coupling flag (CF) Flag 2 (bit 2):1): color mode (CM) Where bit 10 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 one to indicate that the corresponding metering is requested. The Flag 1 allows the choice between two modes of operations of the rate enforcement algorithm. The Flag 2 indicates whether the color-aware or color-blind property is employed by the bandwidth profile. When Flag 2 is set to 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 class of service (CoS) in case a multiple CoS LSP is being MEF Ethernet Traffic Parameters October 2006requested. The index field value MUST correspond to at least one of the index value included in the extended ClassType object ([DS- TE], [MCOS]). A dedicated index MAY correspond 1:1 for each ClassType included in the extended ClassType object. Agiven index value j can be associated to at most N ClassType values CTi (i =< N).N) of the extended ClassType object. This applies in case a set of one or more CTi maps a single BW profile (shared). An example of value setting consists then in assigning an arbitrary value (between 0x10 and 0x77) associated to set of CTi. As a particular case, a given index value j can be associated to a single CTi (1:1 correspondence). An example of index value setting consists then in allocating the CTi value to the index field.field itself (i.e. 0x00,...,0x07). This applies in case a single CTi maps a single BW profile or multiple BW profiles (dedicated). In the former case (single BW profile), the Ethernet SENDER_TSPEC object includes a single Ethernet Bandwidth Profile TLV. In the second 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 allow for combining shared and dedicated BW profiles to the same LSP. That is, an Ethernet SENDER_TSPEC 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 CTi. In the extended classtype object [MCOS], in each of its subobject, the CTi values SHOULD correspond 1:1 to MEF CE VLAN-CoS. In each of its subobject, 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 [RFC1832]). 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 [RFC1832]). 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 [RFC1832]). 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 [RFC1832]). When EIR is strictly greater than 0 (EIR > 0), the EBS MUST be greater than or equal to the maximum frame size. MEF Ethernet Traffic Parameters October 20064. Ethernet FLOWSPEC format The Ethernet FLOWSPEC object (Class-Num = 12, Class-Type = TBA by IANA) has the same format as the Ethernet SENDER_TSPEC object. 5. ADSPEC considerations There is no ADSPEC associated with the Ethernet SENDER_TSPEC object. Either the ADSPEC is omitted or an Int-serv ADSPEC with the Default General Characterization Parameters and Guaranteed Service fragment is used, see [RFC2210]. 6. Processing 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 information content of 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 sub- object TLVs. If the requested value(s) can not be supported, the receiver node MUST generate a PathErr message with a "Traffic Control Error/Service unsupported" indication (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 a "Traffic Control Error/ Bad Tspec value" indication (see [RFC2205]). Error processing of the Extended ClassType object follows rules defined in [MCOS]. Moreover, an 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 towards the sender with the error code 'extended- classtype Error' and an error value of 'Class-Type mismatch'. 7. Security Considerations MEF Ethernet Traffic Parameters October 2006This document introduces no new security considerations to either [RFC3473]. GMPLS security is described in section 11 of [RFC3471] and refers to [RFC3209] for RSVP-TE. 8. IANA Considerations Two values have been defined by IANA for this document: Two RSVP C-Types in registry: http://www.iana.org/assignments/rsvp-parameters - An Ethernet SENDER_TSPEC object: Class = 12, C-Type = TBA (see Section 3). - An Ethernet FLOWSPEC object: Class = 9, C-Type = TBA (see Section 4). 9. References 9.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2205] Braden, R., 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. [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., "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Functional Description", RFC 3471, January 2003. [RFC3473] Berger, L., "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Resource ReserVation Protocol-Traffic Engineering (RSVP-TE) Extensions", RFC 3473, January 2003. MEF Ethernet Traffic Parameters October 20069.2. Informative References [MEF.10] MEF Technical Specification, "Ethernet Services Attributes Phase 1", MEF 10, November 2004. [MCOS] I.Minei et al., "Extensions for Differentiated Services-aware Traffic Engineered LSPs", draft-minei- diffserv-te-multi-class, Work in progress, June 2006. 10. Acknowledgments Many thanks to Adrian Farrel for his comments. 11. Author's Addresses Dimitri Papadimitriou Alcatel Francis Wellesplein 1,Copernicuslaan 50 B-2018 Antwerpen, Belgium Phone: +32 3 2408491 EMail: firstname.lastname@example.org MEF Ethernet Traffic Parameters October 2006Full Copyright Statement Copyright (C) The Internet Society (2006).IETF Trust (2007). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETYSOCIETY, THE IETF TRUST AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. 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