Network Working Group A. Takacs Internet-Draft B. Gero Intended status: Standards Track Ericsson Expires: April 29, 2010 D. Fedyk Alcatel-Lucent D. Mohan Nortel H. Long Huawei October 26, 2009 GMPLS RSVP-TE Extensions for Ethernet OAM Configuration draft-ietf-ccamp-rsvp-te-eth-oam-ext-02 Status of this Memo This Internet-Draft is submitted to IETF 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/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on April 29, 2010. Copyright Notice Copyright (c) 2009 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 in effect on the date of publication of this document (http://trustee.ietf.org/license-info). Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Takacs, et al. Expires April 29, 2010 [Page 1] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 Abstract The GMPLS controlled Ethernet Label Switching (GELS) work is extending GMPLS RSVP-TE to support the establishment of Ethernet LSPs. IEEE Ethernet Connectivity Fault Management (CFM) specifies an adjunct OAM flow to check connectivity in Ethernet networks. CFM can be also used with Ethernet LSPs for fault detection and triggering recovery mechanisms. The ITU-T Y.1731 specification builds on CFM and specifies additional OAM mechanisms, including Performance Monitoring, for Ethernet networks. This document specifies extensions of GMPLS RSVP-TE to support the setup of the associated Ethernet OAM (CFM and Y.1731) entities adding a technology specific TLV to [OAM-CONF-FWK]. Takacs, et al. Expires April 29, 2010 [Page 2] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 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 Table of Contents 1. Background . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Overview of Ethernet OAM operation . . . . . . . . . . . . . . 5 3. GMPLS RSVP-TE Extensions . . . . . . . . . . . . . . . . . . . 7 3.1. Operation overview . . . . . . . . . . . . . . . . . . . . 7 3.2. OAM Configuration TLV . . . . . . . . . . . . . . . . . . 9 3.3. Ethernet OAM Configuration TLV . . . . . . . . . . . . . . 9 3.3.1. MD Name Sub-TLV . . . . . . . . . . . . . . . . . . . 10 3.3.2. Short MA Name Sub-TLV . . . . . . . . . . . . . . . . 11 3.3.3. MEP ID Sub-TLV . . . . . . . . . . . . . . . . . . . . 12 3.3.4. Continuity Check (CC) Sub-TLV . . . . . . . . . . . . 12 3.4. Pro-active Performance Monitoring . . . . . . . . . . . . 13 3.5. Ethernet OAM configuration errors . . . . . . . . . . . . 13 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15 5. Security Considerations . . . . . . . . . . . . . . . . . . . 16 6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 17 7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 19 Takacs, et al. Expires April 29, 2010 [Page 3] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 1. Background Provider Backbone Bridging - Traffic Engineering (PBB-TE) [IEEE-PBBTE] decouples the Ethernet data and control planes by explicitly supporting external control/management mechanisms to configure static filtering entries in bridges and create explicitly routed Ethernet connections. In addition PBB-TE defines mechanisms for 1:1 protection switching of bidirectional Ethernet connections. Ethernet Connectivity Fault Management (CFM) defines an adjunct connectivity monitoring OAM flow to check the liveliness of Ethernet networks [IEEE-CFM]. With PBB-TE Ethernet networks will support explicitly-routed Ethernet connections. CFM can be used to track the liveliness of PBB-TE and point-to-point VLAN connections and detect data plane failures. In IETF the GMPLS controlled Ethernet Label Switching (GELS) [GELS-Framework] work is extending the GMPLS control plane to support the establishment of PBB-TE and point-to-point VLAN data plane connections. We refer to GMPLS established Ethernet connections as Ethernet LSPs. GELS enables the application of MPLS-TE and GMPLS provisioning and recovery features in Ethernet networks. Takacs, et al. Expires April 29, 2010 [Page 4] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 2. Overview of Ethernet OAM operation For the purposes of this document, we only discuss Ethernet OAM [IEEE-CFM] aspects that are relevant for the connectivity monitoring of PBB-TE and point-to-point VLAN connections. PBB-TE [IEEE-PBBTE] defines point-to-point Ethernet Switched Paths (ESPs) as a provisioned traffic engineered unidirectional connectivity, identified by the 3-tuple [ESP-MAC DA, ESP-MAC SA, ESP- VID] where the ESP-MAC DA is the destination address of the ESP, the ESP-MAC SA is the source address of the ESP, and the ESP-VID is a VLAN identifier allocated for explicitly routed connections. To form a bidirectional PBB-TE connection two co-routed point-to-point ESPs are combined. The combined ESPs must have the same ESP-MAC addresses but may have different ESP-VIDs. Note that although it would be possible to use GMPLS to setup a single unidirectional ESP, the Ethernet OAM mechanisms are only full functional when bidirectional connections are established with co- routed ESPs. Hence, we focus on bidirectional point-to-point PBB-TE connections. At both ends of the bidirectional point-to-point PBB-TE connection one Maintenance Endpoint (MEP) is configured. The MEPs monitoring a PBB-TE connection must be configured with the same Maintenance Domain Level (MD Level) and Maintenance Association Identifier (MAID). Each MEP has a unique identifier, the MEP ID. Besides these identifiers a MEP monitoring a PBB-TE connection must be provisioned with the 3-tuples [ESP-MAC DA, ESP-MAC SA, ESP-VID] of the two ESPs. In the case of point-to-point VLAN connections, the connection is identified with a single VLAN forwarding traffic in both directions or with two VLANs each forwarding traffic in a single direction. Hence instead of the 3-tuples of the PBB-TE case MEPs must be provisioned with the proper VLAN information, otherwise the same MD Level, MAID, MEP ID configuration is required in this case as well. MEPs exchange Connectivity Check Messages (CCMs) periodically with fixed intervals. Eight distinct intervals are defined in [IEEE-CFM]: Takacs, et al. Expires April 29, 2010 [Page 5] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 +---+--------------------+----------------+ | # | CCM Interval (CCI) | 3 bit encoding | +---+--------------------+----------------+ | 0 | Reserved | 000 | | | | | | 1 | 3 1/3 ms | 001 | | | | | | 2 | 10 ms | 010 | | | | | | 3 | 100 ms | 011 | | | | | | 4 | 1 s | 100 | | | | | | 5 | 10 s | 101 | | | | | | 6 | 1 min | 110 | | | | | | 7 | 10 min | 111 | +---+--------------------+----------------+ Table 1: CCM Interval encoding If 3 consecutive CCM messages are not received by one of the MEPs it declares a connectivity failure and signals the failure in subsequent CCM messages, by setting the Remote Defect Indicator (RDI) bit, to the remote MEP. If a MEP receives a CCM message with RDI set it immediately declares failure. The detection of a failure may trigger protection switching mechanisms or may be signaled to a management system. However, what happens once a failure is detected is out of the scope of this document. At each transit node Maintenance Intermediate Points (MIPs) can be established to help failure localization by supporting link trace and loop back functions. MIPs need to be provisioned with a subset of MEP identification parameters described above. Takacs, et al. Expires April 29, 2010 [Page 6] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 3. GMPLS RSVP-TE Extensions 3.1. Operation overview To simplify the configuration of connectivity monitoring, when an Ethernet LSP is signaled the associated MEPs should be automatically established. To monitor an Ethernet LSP a set of parameters must be provided to setup a Maintenance Association and related MEPs. Optionally, MIPs may be created at the transit nodes of the Ethernet LSP. The LSP Attributes Flags: "OAM MEP entities desired" and "OAM MIP entities desired", described in [OAM-CONF-FWK] are used to signal that the respective OAM entities must be established. Subsequently, an OAM Configuration TLV is added to the LSP_ATTRIBUTES Object specifying that Ethernet OAM is to be setup for the LSP. The below detailed Ethernet OAM specific information is carried in a new sub- TLV. o A unique MAID must be allocated for the PBB-TE connection and both MEPs must be configured with the same information. The MAID consists of an optional Maintenance Domain Name (MD Name) and a mandatory Short Maintenance Association Name (Short MA Name). Various formatting rules for these names have been defined by [IEEE-CFM]. Since these information is also carried in all CCM messages, the combined length of the Names is limited to 44 bytes. How these parameters are determined is out of scope of this document. o Each MEP must be provisioned with a MEP ID. The MEP ID uniquely identifies a given MEP within a Maintenance Association. That is, the combination of MAID and MEP ID must uniquely identify a MEP. How the value of the MEP ID is determined is out of scope of this document. o The Maintenance Domain Level (MD Level) allows hierarchical separation of monitoring entities. [IEEE-CFM] allows differentiation of 8 levels. How the value of the MD Level is determined is out of scope of this document. Note that most probably for all Ethernet LSPs a single (default) MD Level will be used in a network domain. o The desired CCM Interval must be specified by the management system based on service requirements or operator policy. The same CCM Interval must be set in each of the MEPs monitoring a given Ethernet LSP. How the value of the CCM Interval is determined is out of scope of this document. o The desired CCM priority to be set by MEPs for the CCM frames can be specified. The same CCM priority must be set in each of the Takacs, et al. Expires April 29, 2010 [Page 7] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 MEPs monitoring a given Ethernet LSP. How CCM priority is determined is out of scope of this document. Note that the highest priority is used as the default CCM priority. o MEPs must be aware of their own and the reachability parameters of the remote MEP. In the case of bidirectional point-to-point PBB-TE connections this requires that the 3-tuples [ESP-MAC A, ESP-MAC B, ESP-VID1] and [ESP-MAC B, ESP-MAC A, ESP-VID2] are configured in each MEP, where the ESP-MAC A is the same as the local MEP's MAC and ESP-MAC B is the same as remote MEP's MAC. The GMPLS Ethernet Label for forwarding, as defined in [GELS-PBBTE], consists of the ESP-MAC DA and ESP-VID. Hence the necessary reachability parameters for the MEPs can be obtained from Ethernet Labels (i.e., carried in the "downstream" and upstream labels). In the case of point-to-point VLAN connections, MEPs need to be provisioned with the VLAN identifiers, which in this case are derived similarly from the Ethernet Label. Assuming the procedures described in [GELS-PBBTE] for bidirectional PBB-TE Ethernet LSP establishment the MEP configuration should be as follows. When the RSVP-TE signaling is initiated for the bidirectional Ethernet LSP the local node generates a Path message and: o Allocates an Upstream Label from its MAC address (ESP-MAC A) and locally selected VID (ESP-VID1), that it would like to use to receive traffic; o Inserts an Ethernet OAM Configuration TLV in the LSP_ATTRIBUTES object, specifying the CCM Interval and MD Level; o Adds an MD Name Sub-TLV (optional) and a Short MA Name Sub-TLV to the Ethernet OAM Configuration TLV, that will unambiguously identify a Maintenance Association for this specific PBB-TE connection. Note that values for these parameters may be derived from the GMPLS LSP identification parameters; o Adds a MEP ID Sub-TLV to the Ethernet OAM Configuration TLV. It selects two distinct integer values to identify the local and remote MEPs within the Maintenance Association created for monitoring of the point-to-point PBB-TE connection. Once the remote node receives the Path message it can use the UPSTREAM_LABEL to extract the reachability information of the initiator. Then it allocates a LABEL by selecting the MAC address (ESP-MAC B) and VID (ESP-VID2) it would like to use to receive traffic. These parameters determine the reachability information of the local MEP. That is, the 3-tuples [ESP-MAC A, ESP-MAC B, ESP- Takacs, et al. Expires April 29, 2010 [Page 8] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 VID1] and [ESP-MAC B, ESP-MAC A, ESP-VID2] are derived from the Ethernet Labels. In addition the information received in the Ethernet OAM Configuration TLV is used to configure the local MEP. Once the Resv message successfully arrives to the initiator it can extract the remote side's reachability information from the LABEL object whereby this node has also obtained all the information needed to establish its local MEP. Once the MEPs are established the monitoring of the LSP is operational. In certain situations, e.g., maintenance, re- optimization of LSPs, it is desirable to explicitly enable or disable the monitoring of LSPs (i.e., start/stop exchanging CC messages). To allow administrative control of LSP monitoring the "Monitoring Disabled" (M) bit in the ADMIN_STATUS Object is used [OAM-CONF-FWK]. 3.2. OAM Configuration TLV This TLV is specified in [OAM-CONF-FWK] and is used to select which OAM technology/method should be used for the LSP. In this document a new OAM Type: Ethernet OAM is defined. OAM Type Description ------------ ------------------ 0 Reserved 1 Ethernet OAM 2-256 Reserved The receiving node when the Ethernet OAM Type is requested should look for the corresponding technology specific Ethernet OAM configuration TLV. 3.3. Ethernet OAM Configuration TLV The Ethernet OAM Configuration TLV (depicted below) is defined for Ethernet OAM specific configuration parameters. The Ethernet OAM Configuration TLV is carried in the LSP_ATTRIBUTES object in Path messages. This new TLV accommodates generic Ethernet OAM information and carries sub-TLVs. Takacs, et al. Expires April 29, 2010 [Page 9] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 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 (3) (IANA) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Version |MD L.| Reserved (set to all 0s) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ sub TLVs ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: indicates a new type: the Ethernet OAM Configuration TLV (3) (IANA to define). Length: indicates the total length including sub-TLVs. Version: identifies the CFM protocol version according to [IEEE-CFM]. If a node does not support a specific CFM version an error must be generated: "OAM Problem/Unsupported OAM Version" MD L. (MD Level): indicates the desired MD Level. The values are according to [IEEE-CFM]. If a node does not support a specific MD Level an error must be generated: "OAM Problem/Unsupported OAM Level". 3.3.1. MD Name Sub-TLV The optional MD Name sub-TLV is depicted below. 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 (1) (IANA) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Format | Name Length | Reserved (set to all 0s) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ MD Name ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: 1, MD Name Sub-TLV (IANA). Length: indicates the total length of the TLV including padding. Format: according to [IEEE-CFM]. Takacs, et al. Expires April 29, 2010 [Page 10] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 Name Length: the length of the MD Name field in bytes. This is necessary to allow non 4 byte padded MD Name lengths. MD Name: variable length field, formatted according to the format specified in the Format field. If an undefined Format is specified an error must be generated: "OAM Problem/Unknown MD Name Format". Also the combined length of MD Name and Short MA Name must be less or equal to 44bytes, if this is violated an error must be generated: "OAM Problem/Name Length Problem". Note that it is allowed to have no MD Name, as such the MD Name sub-TLV is optional. In this case the MA Name must uniquely identify a Maintenance Association. 3.3.2. Short MA Name Sub-TLV The Short MA Name sub-TLV is depicted below. 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 (2) (IANA) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Format | Name Length | Reserved (set to all 0s) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ Short MA Name ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: 2, Short MA Name Sub-TLV (IANA) Length: indicates the total length of the TLV including padding. Format: according to [IEEE-CFM]. Name Length: the length of the MA Name field in bytes. This is necessary to allow non 4 byte padded MA Name lengths. Short MA Name: variable length field formatted according to the format specified in the Format field. If an undefined Format is specified an error must be generated: "OAM Problem/Unknown MA Name Format". Also the combined length of MD Name and Short MA Name must be less or equal to 44bytes, if this is violated an error must be generated: "OAM Problem/Name Length Problem". Note that it is allowed to have no MD Name, in this case the MA Name must uniquely identify a Maintenance Association. Takacs, et al. Expires April 29, 2010 [Page 11] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 3.3.3. MEP ID Sub-TLV The MEP ID Sub-TLV is depicted below. 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 (3) (IANA) | Length (4) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Local MEP ID |T|R| Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Remote MEP ID |T|R| Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: 3, MEP ID Sub-TLV (IANA) Length: indicates the total length of the TLV including padding. Local MEP ID: a 16 bit integer value in the range 1-8191 of the MEP ID on the initiator side. Remote MEP ID: a 16 bit integer value in the range 1-8191 of the MEP ID to be set for the MEP established at the receiving side. This value is determined by the initiator node. This is possible, since a new MAID is assigned to each PBB-TE connection, and MEP IDs must be only unique within the scope of the MAID. Two flags are defined Transmit (T) and Receive (R). When T is set the corresponding MEP must send OAM packets. When R is set the corresponding MEP must expect to receive OAM packets. These flags are used to configure the role of MEPs. 3.3.4. Continuity Check (CC) Sub-TLV The Continuity Check (CC) sub-TLV is depicted below. 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 (4) (IANA) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Prio | CCM I | Reserved (set to all 0s) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Prio: Indicates the priority to be set for CCM frames. In Ethernet 3 bits carried in VLAN TAGs identify priority information. Takacs, et al. Expires April 29, 2010 [Page 12] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 CCM I (CCM Interval): CCM Interval, according to the 3 bit encoding [IEEE-CFM] shown in Table 1. If a node does not support the requested CCM Interval an error must be generated: "OAM Problem/ Unsupported CC Interval". 3.4. Pro-active Performance Monitoring Ethernet OAM functions for Performance Monitoring (PM) allow measurements of different performance parameters including Frame Loss Ratio, Frame Delay and Frame Delay variation as defined in the ITU-T Y.1731 recommendation. Only a subset of PM functions are operated in a pro-active fashion to monitor the performance of the connection continuously. Pro-active PM supports Fault Management functions, by providing an indication of decreased service performance and as such may provide triggers to initiate recovery procedures. While on demand PM functions are always initiated by management commands, for pro-active PM it may be desirable to utilize the control plane for configuration and activation together with Fault Management functions such as Continuity Check. ITU-T Y.1731 defines dual-ended Loss Measurement as pro-active OAM for performance monitoring and as a PM function applicable to fault management. For dual-ended Loss Measurement each MEP piggy-backs transmitted and received frame counters on CC messages; to support and synchronize bidirectional Loss Measurements at the MEPs. Dual- ended Loss Measurement is invoked by setting the Performance Monitoring/Loss OAM Function flag in the OAM Configuration TLV [OAM-CONF-FWK]. Besides configuring the Continuity Check functionality, no additional configuration is required for this type of Loss Measurement. 3.5. Ethernet OAM configuration errors In addition to error values specified in [OAM-CONF-FWK] this document defines the following values for the "OAM Problem" Error Code. o If a node does not support a specific CFM version an error must be generated: "OAM Problem/Unsupported OAM Version". o If a node does not support a specific MD Level an error must be generated: "OAM Problem/Unsupported OAM Level". o If an undefined MD name format is specified an error must be generated: "OAM Problem/Unknown MD Name Format". o If an undefined MA name format is specified an error must be generated: "OAM Problem/Unknown MA Name Format". Takacs, et al. Expires April 29, 2010 [Page 13] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 o If the combined length of MD Name and Short MA Name must be less or equal to 44bytes, if this is violated an error must be generated: "OAM Problem/Name Length Problem". o If a node does not support the requested CCM Interval an error must be generated: "OAM Problem/Unsupported CC Interval". Takacs, et al. Expires April 29, 2010 [Page 14] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 4. IANA Considerations This document specifies a new Ethernet OAM Configuration TLV to be carried in the OAM Configuration TLV in LSP_ATTRIBUTES and LSP_REQUIRED_ATTRIBUTES objects in Path messages. The following values need to be assigned under the Error Code: "OAM Problem": "Unsupported OAM Version", "Unsupported OAM Level", "Unknown MD Name Format", "Unknown MA Name Format", "Name Length Problem", "Unsupported CC Interval". Takacs, et al. Expires April 29, 2010 [Page 15] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 5. Security Considerations The signaling of OAM related parameters and the automatic establishment of OAM entities introduces additional security considerations to those discussed in [RFC3473]. In particular, a network element could be overloaded, if an attacker would request liveliness monitoring, with frequent periodic messages, for a high number of LSPs, targeting a single network element. Security aspects will be covered in more detailed in subsequent versions of this document. Takacs, et al. Expires April 29, 2010 [Page 16] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 6. Acknowledgements The authors would like to thank Francesco Fondelli, Adrian Farrel, Loa Andersson, Eric Gray and Dimitri Papadimitriou for their useful comments. Takacs, et al. Expires April 29, 2010 [Page 17] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 7. References [GELS-Framework] "GMPLS Ethernet Label Switching Architecture and Framework", Internet Draft, work in progress. [GELS-PBBTE] "GMPLS control of Ethernet PBB-TE", Internet Draft, work in progress. [GMPLS-OAM] "OAM Requirements for Generalized Multi-Protocol Label Switching (GMPLS) Networks", Internet Draft, work in progress. [IEEE-CFM] "IEEE 802.1ag, Draft Standard for Connectivity Fault Management", work in progress. [IEEE-PBBTE] "IEEE 802.1Qay Draft Standard for Provider Backbone Bridging Traffic Engineering", work in progress. [OAM-CONF-FWK] "OAM Configuration Framework for GMPLS RSVP-TE", Internet Draft, work in progress. [RFC3469] "Framework for Multi-Protocol Label Switching (MPLS)-based Recovery", RFC 3469, February 2003. [RFC3471] "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Functional Description", RFC 3471, January 2003. [RFC3473] "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Resource ReserVation Protocol-Traffic Engineering (RSVP-TE) Extensions", RFC 3473, January 2003. [RFC4377] "Operations and Management (OAM) Requirements for Multi- Protocol Label Switched (MPLS) Networks", RFC 4377, February 2006. [RFC4420] "Encoding of Attributes for Multiprotocol Label Switching (MPLS) Label Switched Path (LSP) Establishment Using Resource ReserVation Protocol-Traffic Engineering (RSVP-TE)", RFC 4420, February 2006. Takacs, et al. Expires April 29, 2010 [Page 18] Internet-Draft GMPLS based Ethernet OAM Configuration October 2009 Authors' Addresses Attila Takacs Ericsson Laborc u. 1. Budapest, 1037 Hungary Email: attila.takacs@ericsson.com Balazs Gero Ericsson Laborc u. 1. Budapest, 1037 Hungary Email: balazs.gero@ericsson.com Don Fedyk Alcatel-Lucent Groton, MA 01450 USA Email: donald.fedyk@alcatel-lucent.com Dinesh Mohan Nortel 3500 Carling Ave Ottawa, ON, K2H8E9 Canada Email: mohand@nortel.com Hao Long Huawei Email: lonho@huawei.com Takacs, et al. Expires April 29, 2010 [Page 19]