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RFC 7369

GMPLS RSVP-TE Extensions for Ethernet Operations, Administration, and Maintenance (OAM) Configuration

Pages: 18
Proposed Standard

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Internet Engineering Task Force (IETF)                         A. Takacs
Request for Comments: 7369                                       B. Gero
Category: Standards Track                                       Ericsson
ISSN: 2070-1721                                                  H. Long
                                                                  Huawei
                                                            October 2014


                 GMPLS RSVP-TE Extensions for Ethernet
    Operations, Administration, and Maintenance (OAM) Configuration

Abstract

The work related to GMPLS Ethernet Label Switching (GELS) extended GMPLS RSVP-TE to support the establishment of Ethernet Label Switching Paths (LSPs). IEEE Ethernet Connectivity Fault Management (CFM) specifies an adjunct Operations, Administration, and Maintenance (OAM) flow to check connectivity in Ethernet networks. CFM can also be 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 the GMPLS RSVP-TE protocol to support the setup of the associated Ethernet OAM entities of Ethernet LSPs and defines the Ethernet technology-specific TLVs based on the GMPLS OAM Configuration Framework. This document supports, but does not modify, the IEEE and ITU-T OAM mechanisms. 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/rfc7369.
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Copyright Notice

   Copyright (c) 2014 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
   described in the Simplified BSD License.

Table of Contents

1. Background . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3 2. Overview of Ethernet OAM Operation . . . . . . . . . . . . . 3 3. GMPLS RSVP-TE Extensions . . . . . . . . . . . . . . . . . . 5 3.1. Operation Overview . . . . . . . . . . . . . . . . . . . 5 3.2. OAM Configuration TLV . . . . . . . . . . . . . . . . . . 7 3.3. Ethernet OAM Configuration Sub-TLV . . . . . . . . . . . 8 3.3.1. MD Name Sub-TLV . . . . . . . . . . . . . . . . . . . 9 3.3.2. Short MA Name Sub-TLV . . . . . . . . . . . . . . . . 10 3.3.3. MEP ID Sub-TLV . . . . . . . . . . . . . . . . . . . 11 3.3.4. Continuity Check (CC) Sub-TLV . . . . . . . . . . . . 12 3.4. Proactive Performance Monitoring . . . . . . . . . . . . 12 3.5. Summary of Ethernet OAM Configuration Errors . . . . . . 13 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14 4.1. RSVP-TE OAM Configuration Registry . . . . . . . . . . . 14 4.2. Ethernet Sub-TLVs Sub-Registry . . . . . . . . . . . . . 15 4.3. RSVP Error Code . . . . . . . . . . . . . . . . . . . . . 15 5. Security Considerations . . . . . . . . . . . . . . . . . . . 16 6. References . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.1. Normative References . . . . . . . . . . . . . . . . . . 16 6.2. Informative References . . . . . . . . . . . . . . . . . 17 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 17 Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 18
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1. Background

Provider Backbone Bridging - Traffic Engineering (PBB-TE) [IEEE.802.1Q-2011] decouples the Ethernet data and control planes and allows external control and management mechanisms to create explicitly routed Ethernet connections. In addition, PBB-TE defines mechanisms for 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.802.1Q-2011], including the monitoring of specific explicitly routed Ethernet connections. The ITU-T Recommendation Y.1731 [ITU-T.G.8013-2013] extended CFM and specified additional OAM functionality. In the IETF, the work related to GMPLS Ethernet Label Switching (GELS) extended the GMPLS control plane to support the establishment of explicitly routed Ethernet connections [RFC5828] [RFC6060]. 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. The use of GMPLS RSVP-TE to support the establishment and configuration of OAM entities with LSP signaling is defined in a technology-agnostic way in [RFC7260]. The purpose of this document is to specify the additional technology-specific OAM entities to support Ethernet connections.

1.1. 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 [RFC2119].

2. Overview of Ethernet OAM Operation

For the purposes of this document, we only discuss Ethernet OAM aspects that are relevant for proactive connectivity monitoring of Ethernet LSPs and assume that on-demand OAM functions will be supported by management-plane operations. PBB-TE 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
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   but may have different ESP-VIDs.  The formed co-routed bidirectional
   path is a path where the forward and backward directions follow the
   same route (links and nodes) across the network.

   Note that although it would be possible to use GMPLS to set up a
   single unidirectional ESP, the Ethernet OAM mechanisms are only fully
   functional when bidirectional connections are established with co-
   routed ESPs.  Therefore, the scope of this document only covers
   bidirectional point-to-point PBB-TE connections.

   At both ends of the bidirectional point-to-point PBB-TE connection,
   one Maintenance Entity Group End Point (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 may be
   identified with a single VLAN or with two VLANs, one for each
   direction.  Therefore, instead of the 3-tuples of the PBB-TE ESPs,
   MEPs must be provisioned with the proper VLAN identifiers.

   MEPs exchange Connectivity Check Messages (CCMs) periodically with
   fixed intervals.  Eight distinct intervals are defined in
   [IEEE.802.1Q-2011]:

                +---+--------------------+----------------+
                | # | 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
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   If three consecutive CCMs are lost, connectivity failure is declared.
   The MEP detecting the failure will signal the defect to the remote
   MEP in the subsequent CCMs it emits by setting the Remote Defect
   Indicator (RDI) bit in the CCM.  If a MEP receives a CCM with the RDI
   bit set, it immediately declares failure.  The detection of a failure
   may trigger protection switching mechanisms or may be signaled to a
   management system.

   At each transit node, Maintenance Entity Group Intermediate Points
   (MIPs) may be established to help failure localization, e.g., using
   link trace and loopback functions.  MIPs need to be provisioned with
   a subset of the MEP identification parameters described above.

3. GMPLS RSVP-TE Extensions

3.1. Operation Overview

To simplify the configuration of connectivity monitoring, the associated MEPs should be automatically established when an Ethernet LSP is signaled. To monitor an Ethernet LSP, a set of parameters must be provided to set up a Maintenance Association and related MEPs. Optionally, MIPs may be created at the transit nodes of the Ethernet LSP. The LSP Attribute Flags "OAM MEP entities desired" and "OAM MIP entities desired", as described in [RFC7260], are used to signal that the respective OAM entities must be established. An OAM Configuration TLV, as described in [RFC7260], is added to the LSP_ATTRIBUTES or LSP_REQUIRED_ATTRIBUTES objects specifying that Ethernet OAM is to be set up for the LSP. Information specific to Ethernet OAM, as described below, is carried in the new Ethernet OAM Configuration Sub-TLV (see Section 3.3) within the OAM Configuration 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 in [IEEE.802.1Q-2011]. Since this information is also carried in all CCMs, the combined length of the MD Name and Short MA Name is limited to 44 bytes (see [IEEE.802.1Q-2011] for the details of the message format). How these parameters are determined is out of the 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 the scope of this document.
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   o  The Maintenance Domain Level (MD Level) allows hierarchical
      separation of monitoring entities.  [IEEE.802.1Q-2011] allows
      differentiation of eight levels.  How the value of the MD Level is
      determined is out of the scope of this document.  Note that
      probably for all Ethernet LSPs, a single (default) MD Level will
      be used within 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 the scope of this document.

   o  The desired forwarding priority to be set by MEPs for the CCM
      frames may be specified.  The same CCM priority must be set in
      each of the MEPs monitoring a given Ethernet LSP.  How CCM
      priority is determined is out of the scope of this document.  Note
      that the highest priority should be used as the default CCM
      priority.

   o  MEPs must be aware of their own reachability parameters and those
      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 Media Access Control (MAC) address and ESP-MAC B is
      the same as the remote MEP's MAC address.  The GMPLS Ethernet
      Label format, as defined in [RFC6060], consists of the ESP-MAC DA
      and ESP-VID.  Hence, the necessary reachability parameters for the
      MEPs can be obtained from the 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 only, which can be derived similarly from the Ethernet
      Labels.

   Based on the procedures described in [RFC6060] for bidirectional PBB-
   TE Ethernet LSP establishment, the Ethernet OAM configuration
   procedures are 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 formed by combining its MAC address
      (ESP-MAC A) and locally selected VID (ESP-VID1), which will be
      used to receive traffic;
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   o  MUST include the OAM Configuration TLV with OAM Type set to
      Ethernet OAM in the LSP_ATTRIBUTES or LSP_REQUIRED_ATTRIBUTES
      objects;

   o  MUST include the OAM Function Flags Sub-TLV in the OAM
      Configuration TLV and set the OAM function flags as needed;

   o  MUST include an Ethernet OAM Configuration Sub-TLV in the OAM
      Configuration TLV that specifies the CCM Interval and MD Level;

   o  MAY add an MD Name Sub-TLV (optional) and MUST add a Short MA Name
      Sub-TLV (required) to the Ethernet OAM Configuration Sub-TLV,
      which 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; and

   o  MUST include a MEP ID Sub-TLV in the Ethernet OAM Configuration
      Sub-TLV and select 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 a local MAC
   address (ESP-MAC B) and VID (ESP-VID2) that will be used 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-
   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, this end
   can extract the remote side's reachability information from the Label
   object and therefore has all the information needed to properly
   configure its local MEP.

3.2. OAM Configuration TLV

This TLV is specified in [RFC7260] 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. IANA has allocated OAM Type 1 for Ethernet OAM in the "RSVP-TE OAM Configuration Registry".
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     RSVP-TE OAM Configuration Registry

       OAM Type           Description
     ------------      ------------------
         1               Ethernet OAM

   When the Ethernet OAM Type is requested, the receiving node should
   look for the corresponding technology-specific Ethernet OAM
   Configuration Sub-TLV.

3.3. Ethernet OAM Configuration Sub-TLV

The Ethernet OAM Configuration Sub-TLV (depicted below) is defined for configuration parameters specific to Ethernet OAM. The Ethernet OAM Configuration Sub-TLV, when used, MUST be carried in the OAM Configuration TLV. This new sub-TLV accommodates Ethernet OAM information and carries sub-TLVs. 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 32 | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Version |MD L.| Reserved (set to all 0s) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ Sub-TLVs ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: Indicates a new type, the Ethernet OAM Configuration Sub-TLV. IANA has assigned the value 32 from the "OAM Sub-TLVs" space in the "RSVP-TE OAM Configuration Registry". Length: Indicates the total length of the TLV including padding and including the Type and Length fields. Version: Identifies the CFM protocol version according to [IEEE.802.1Q-2011]. 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. Possible values are defined according to [IEEE.802.1Q-2011]. If a node does not support a specific MD Level, an error MUST be generated: "OAM Problem/Unsupported MD Level".
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3.3.1. MD Name Sub-TLV

The optional MD Name Sub-TLV is depicted below. It MAY be used for MD naming. 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) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Format | Name Length | Reserved (set to all 0s) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ MD Name ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: 1, MD Name Sub-TLV. IANA will maintain an Ethernet TLV Type space in the "RSVP-TE OAM Configuration Registry" for the sub-TLV types carried in the Ethernet OAM Configuration Sub-TLV. Length: Indicates the total length of the TLV, including padding and the Type and Length fields. Format: According to [IEEE.802.1Q-2011]. 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 than or equal to 44 bytes. If this is violated, an error MUST be generated: "OAM Problem/Name Length Problem". Note that it is allowed to have no MD Name; therefore, the MD Name Sub-TLV is optional. In this case, the MA Name must uniquely identify a Maintenance Association.
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3.3.2. Short MA Name Sub-TLV

The Short MA Name Sub-TLV is depicted below. This sub-TLV MUST be present in the Ethernet OAM Configuration Sub-TLV. 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) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Format | Name Length | Reserved (set to all 0s) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ Short MA Name ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: 2, Short MA Name Sub-TLV. IANA will maintain an Ethernet TLV Type space in the "RSVP-TE OAM Configuration Registry" for the sub- TLV types carried in the Ethernet OAM Configuration Sub-TLV. Length: Indicates the total length of the TLV, including padding and the Type and Length fields. Format: According to [IEEE.802.1Q-2011]. Name Length: The length of the Short 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 than or equal to 44 bytes. 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.
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3.3.3. MEP ID Sub-TLV

The MEP ID Sub-TLV is depicted below. This sub-TLV MUST be present in the Ethernet OAM Configuration Sub-TLV. 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) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Local MEP ID |T|R| Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Remote MEP ID |T|R| Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: 3, MEP ID Sub-TLV. IANA will maintain an Ethernet TLV Type space in the "RSVP-TE OAM Configuration Registry" for the sub-TLV types carried in the Ethernet OAM Configuration Sub-TLV. Length: Indicates the total length of the TLV, including padding and the Type and Length fields. 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.
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3.3.4. Continuity Check (CC) Sub-TLV

The Continuity Check (CC) Sub-TLV is depicted below. This sub-TLV MUST be present in the Ethernet OAM Configuration Sub-TLV. 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) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Prio | CCM I | Reserved (set to all 0s) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: 4, Continuity Check (CC) Sub-TLV. IANA will maintain an Ethernet TLV Type space in the "RSVP-TE OAM Configuration Registry" for the sub-TLV types carried in the Ethernet OAM Configuration Sub- TLV. Length: Indicates the total length of the TLV, including padding and the Type and Length fields. Prio: Indicates the priority to be set for CCM frames. In Ethernet, 3 bits carried in VLAN TAGs identify priority information. Setting the priority is optional. If the most significant bit is set to zero, the subsequent 3 priority bits will be ignored, and priority bits of the Ethernet CCM frame will be set based on default values specified in the Ethernet nodes. If the most significant bit is set to 1, the subsequent 3 bits will be used to set the priority bits of the Ethernet CCM frame. CCM I (CCM Interval): MUST be set according to the 3-bit encoding [IEEE.802.1Q-2011] shown in Table 1. As a consequence, the most significant bit will be set to 0. Four bits are allocated to support the configuration of CCM Intervals that may be specified in the future. If a node does not support the requested CCM Interval, an error MUST be generated: "OAM Problem/Unsupported CC Interval".

3.4. Proactive 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 [ITU-T.G.8013-2013]. Only a subset of PM functions are operated in a proactive fashion to monitor the performance of the connection continuously. Proactive PM supports Fault Management functions by providing an indication of decreased service performance and therefore may provide triggers to initiate recovery procedures.
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   While on-demand PM functions are, for the purposes of this document,
   always initiated by management commands, for proactive PM, it may be
   desirable to utilize the control plane for configuration and
   activation together with Fault Management functions such as the
   Continuity Check.

   [ITU-T.G.8013-2013] defines dual-ended Loss Measurement as proactive
   OAM for Performance Monitoring and as a PM function applicable to
   Fault Management.  For dual-ended Loss Measurement, each MEP
   piggybacks transmitted and received frame counters on CC messages to
   support and synchronize bidirectional Loss Measurements at the MEPs.
   Dual-ended Loss Measurement is supported by setting the Performance
   Monitoring/Loss OAM Function Flag and the Continuity Check Flag in
   the OAM Function Flags Sub-TLV [RFC7260] and configuring the
   Continuity Check functionality by including the Ethernet OAM
   Configuration Sub-TLV.  No additional configuration is required for
   this type of Loss Measurement.

3.5. Summary of Ethernet OAM Configuration Errors

In addition to the error values specified in [RFC7260], 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 MD 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". o The combined length of MD Name and Short MA Name must be less than or equal to 44 bytes. 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".
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4. IANA Considerations

4.1. RSVP-TE OAM Configuration Registry

IANA maintains the "RSVP-TE OAM Configuration Registry". IANA has assigned an "OAM Type" from this registry as follows: o "Ethernet OAM" has been allocated type 1 from the "OAM Types" sub- registry of the "RSVP-TE OAM Configuration Registry". o "Ethernet OAM Configuration Sub-TLV" has been allocated type 32 from the technology-specific range of the "OAM Sub-TLVs" sub- registry of the "RSVP-TE OAM Configuration Registry". RSVP-TE OAM Configuration Registry OAM Types OAM Type Number | Description | Reference ------------------------------------------- 1 | Ethernet OAM | [RFC7369] OAM Sub-TLVs Sub-TLV Type | Description | Ref. ----------------------------------------------------------- 32 |Ethernet OAM Configuration Sub-TLV| [RFC7369]
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4.2. Ethernet Sub-TLVs Sub-Registry

IANA will maintain an "Ethernet Sub-TLVs Sub-Registry" in the "RSVP- TE OAM Configuration Registry" for the sub-TLV types carried in the Ethernet OAM Configuration Sub-TLV. This document defines the following types. Ethernet Sub-TLVs Sub-Registry Range | Registration Procedures ------------+-------------------------- 0-65534 | IETF Review 65535 | Experimental Sub-TLV Type | Description | Ref. --------------------------------------------------------- 0 | Reserved | [RFC7369] 1 | MD Name Sub-TLV | [RFC7369] 2 | Short MA Name Sub-TLV | [RFC7369] 3 | MEP ID Sub-TLV | [RFC7369] 4 | Continuity Check Sub-TLV | [RFC7369] 5-65534 | Unassigned | [RFC7369] 65535 | Reserved for Experimental Use | [RFC7369]

4.3. RSVP Error Code

IANA maintains an Error Code, "OAM Problem", in the "Error Codes and Globally-Defined Error Value Sub-Codes" sub-registry of the "Resource Reservation Protocol (RSVP) Parameters" registry. [RFC7260] defines a set of Error Value sub-codes for the "OAM Problem" Error Code. This document defines additional Error Value sub-codes for the "OAM Problem" Error Code as summarized below. Value | Description | Reference -------+---------------------------+----------- 7 | Unsupported OAM Version | [RFC7369] 8 | Unsupported MD Level | [RFC7369] 9 | Unknown MD Name Format | [RFC7369] 10 | Unknown MA Name Format | [RFC7369] 11 | Name Length Problem | [RFC7369] 12 | Unsupported CC Interval | [RFC7369]
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5. Security Considerations

This document does not introduce any additional security issues to those discussed in [RFC7260] and [RFC6060]. The signaling of OAM-related parameters and the automatic establishment of OAM entities based on RSVP-TE messages add a new aspect to the security considerations discussed in [RFC3473]. In particular, a network element could be overloaded if a remote attacker targeted that element by sending frequent periodic messages requesting liveliness monitoring of a high number of LSPs. Such an attack can efficiently be prevented when mechanisms for message integrity and node authentication are deployed. Since the OAM configuration extensions rely on the hop-by-hop exchange of exiting RSVP-TE messages, procedures specified for RSVP message security in [RFC2747] can be used to mitigate possible attacks. For a more comprehensive discussion of GMPLS security and attack mitigation techniques, please see "Security Framework for MPLS and GMPLS Networks" [RFC5920].

6. References

6.1. Normative References

[IEEE.802.1Q-2011] IEEE, "IEEE Standard for Local and metropolitan area networks--Media Access Control (MAC) Bridges and Virtual Bridged Local Area Networks", IEEE Std 802.1Q, 2011. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997, <http://www.rfc-editor.org/info/rfc2119>. [RFC6060] Fedyk, D., Shah, H., Bitar, N., and A. Takacs, "Generalized Multiprotocol Label Switching (GMPLS) Control of Ethernet Provider Backbone Traffic Engineering (PBB- TE)", RFC 6060, March 2011, <http://www.rfc-editor.org/info/rfc6060>. [RFC7260] Takacs, A., Fedyk, D., and J. He, "GMPLS RSVP-TE Extensions for Operations, Administration, and Maintenance (OAM) Configuration", RFC 7260, June 2014, <http://www.rfc-editor.org/info/rfc7260>.
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6.2. Informative References

[ITU-T.G.8013-2013] International Telecommunications Union, "OAM functions and mechanisms for Ethernet based networks", ITU-T Recommendation G.8013/Y.1731, November 2011. [RFC2747] Baker, F., Lindell, B., and M. Talwar, "RSVP Cryptographic Authentication", RFC 2747, January 2000, <http://www.rfc-editor.org/info/rfc2747>. [RFC3473] Berger, L., "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Resource ReserVation Protocol-Traffic Engineering (RSVP-TE) Extensions", RFC 3473, January 2003, <http://www.rfc-editor.org/info/rfc3473>. [RFC5828] Fedyk, D., Berger, L., and L. Andersson, "Generalized Multiprotocol Label Switching (GMPLS) Ethernet Label Switching Architecture and Framework", RFC 5828, March 2010, <http://www.rfc-editor.org/info/rfc5828>. [RFC5920] Fang, L., "Security Framework for MPLS and GMPLS Networks", RFC 5920, July 2010, <http://www.rfc-editor.org/info/rfc5920>.

Acknowledgements

The authors would like to thank Francesco Fondelli, Adrian Farrel, Loa Andersson, Eric Gray, and Dimitri Papadimitriou for their useful comments.

Contributors

Don Fedyk EMail: don.fedyk@hp.com Dinesh Mohan EMail: dinmohan@hotmail.com
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Authors' Addresses

Attila Takacs Ericsson Konyves Kalman krt. 11. Budapest 1097 Hungary EMail: attila.takacs@ericsson.com Balazs Peter Gero Ericsson Konyves Kalman krt. 11. Budapest 1097 Hungary EMail: balazs.peter.gero@ericsson.com Hao Long Huawei China EMail: lonho@huawei.com