Network Working Group A.Farrel Internet-Draft D. King Intended status: Informational Old Dog Consulting Expires: April 7, 2011 M.Venkatesan Aricent J. Ryoo ETRI S. Mansfield Ericsson K. Koushik Cisco Systems, Inc. November 7, 2010 Multiprotocol Label Switching Transport Profile (MPLS-TP) MIB-based Management Overview draft-ietf-mpls-tp-mib-management-overview-00.txt Abstract A range of Management Information Base (MIB) modules has been developed to help model and manage the various aspects of Multiprotocol Label Switching (MPLS) networks. These MIB modules are defined in separate documents that focus on the specific areas of responsibility of the modules that they describe. The MPLS Transport Profile (MPLS-TP) is a profile of MPLS functionality specific to the construction of packet-switched transport networks. This document describes the MIB-based management architecture for MPLS-TP and indicates the interrelationships between the different MIB modules used for MPLS-TP network management. This document is a product of a joint Internet Engineering Task Force (IETF) / International Telecommunication Union Telecommunication Standardization Sector (ITU-T) effort to include an MPLS Transport Profile within the IETF MPLS and PWE3 architectures to support the capabilities and functionalities of a packet transport network as defined by the ITU-T. This Informational Internet-Draft is aimed at achieving IETF Consensus before publication as an RFC and will be subject to an IETF Last Call. [RFC Editor, please remove this note before publication as an RFC and insert the correct Streams Boilerplate to indicate that the published RFC has IETF Consensus.] Farrel & King, et al. [Page 1] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 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 March 21, 2011. Copyright Notice Copyright (c) 2010 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction.................................................3 2. Terminology..................................................4 3. The SNMP Management Framework................................4 4. Summary of MPLS-TP Management Function.......................4 5. Overview of Existing Work....................................4 5.1. MPLS Management Overview and Requirements...............5 5.2. An Introduction to the MPLS and Pseudowire MIB Modules..5 5.2.1. Structure of the MPLS MIB OID Tree...............5 5.2.2. Textual Convention Modules.......................6 Farrel & King, et al. [Page 2] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 5.2.3. Mapping Data to LSPs.............................7 5.2.4. Label Switching Router Modules...................8 5.2.5. Label Switched Path Modules......................8 5.2.6. Pseudowire Modules...............................8 5.2.7. Routing and Traffic Engineering..................10 5.2.8. Resiliency.......................................10 5.2.9. Fault Management and Performance Management......10 5.2.10. MIB Module Interdependencies....................11 5.2.11. Dependencies on External MIB Modules............12 6. Applicability of MPLS MIB modules to MPLS-TP.................13 6.1 Gap Analysis............................................13 6.1.1 MPLS-TP Tunnel....................................13 6.1.2 MPLS-TP Pseudowire................................13 6.1.3 MPLS-TP Sections..................................13 6.1.4 MPLS-TP OAM.......................................13 6.1.5 MPLS-TP Protection Switching......................14 6.1.6 MIB Module Interdependencies......................15 7. Interfaces...................................................17 7.1. MPLS Tunnels as Interfaces..............................17 7.2. Application of the Interfaces Group to TE Links.........17 7.3. References to Interface Objects from MPLS MIB Modules...17 8. Management Options...........................................18 9. Security Considerations......................................18 10. IANA Considerations.........................................18 11. Acknowledgements............................................18 12. Normative References........................................19 13. Informational References....................................19 14. Authors' Addresses..........................................20 1. Introduction The MPLS Transport Profile (MPLS-TP) is a packet transport technology based on a profile of the MPLS functionality specific to the construction of packet-switched transport networks. MPLS is described in [RFC3031] and requirements for MPLS-TP are specified in [RFC5654]. A range of Management Information Base (MIB) modules has been developed to help model and manage the various aspects of Multiprotocol Label Switching (MPLS) networks. These MIB modules are defined in separate documents that focus on the specific areas of responsibility of the modules that they describe. An MPLS-TP network can be operated via static provisioning of transport paths, or the elective use of a Generalized MPLS (GMPLS) control plane to support dynamic provisioning of transport paths. This document describes the MIB-based management architecture for MPLS-TP and indicates the interrelationships between the existing MIB modules used for MPLS-TP network management. The document also indentifies areas where additional MIB modules would be required to support an MPLS-TP network. Farrel & King, et al. [Page 3] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 This document is a product of a joint Internet Engineering Task Force (IETF) / International Telecommunication Union Telecommunication Standardization Sector (ITU-T) effort to include an MPLS Transport Profile within the IETF MPLS and PWE3 architectures to support the capabilities and functionalities of a packet transport network. 2. Terminology This document also uses terminology from the MPLS architecture document [RFC3031] and the following MPLS related MIB modules: MPLS TC MIB [RFC3811], MPLS LSR MIB [RFC3813], MPLS TE MIB [RFC3812], MPLS LDP MIB [RFC3815], MPLS FTN MIB [RFC3814] and TE LINK MIB [RFC4220]. 3. The SNMP Management Framework Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. MIB objects are generally accessed through the Simple Network Management Protocol (SNMP). Objects in the MIB are defined using the mechanisms defined in the Structure of Management Information (SMI). For a detailed overview of the documents that describe the current Internet-Standard Management Framework, please refer to section 7 of RFC 3410 [RFC3410]. This document discusses MIB modules that are compliant to the SMIv2, which is described in [RFC2578], [RFC2579] and [RFC2580]. 4. Summary of MPLS-TP Management Function The management of the MPLS-TP networks is separable from that of its client networks so that the same means of management can be used regardless of the client. The management functions of MPLS-TP includes fault management, configuration management, performance monitoring, and security management. 5. Overview of Existing Work This section describes the existing tools and techniques for managing and modeling MPLS networks, devices, and protocols. It does not focus on MPLS-TP, but is intended to provide a description of the tool kit that is already available. Farrel & King, et al. [Page 4] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 The following section (Section 6. Applicability of MPLS MIB modules to MPLS-TP) of this document describes the applicability of the MPLS and optional use of GMPLS MIB modules to MPLS-TP and examines the additional MIB modules and objects that would be required for managing an MPLS-TP network. 5.1. MPLS Management Overview and Requirements [RFC4378] outlines how data plane protocols can assist in providing the Operations and Management (OAM) requirements outlined in [RFC4377] and how it is applied to the management functions of fault, configuration, accounting, performance, and security (commonly known as FCAPS) for MPLS networks. [RFC4221] describes the management architecture for MPLS. In particular, it describes how the managed objects defined in various MPLS-related MIB modules model different aspects of MPLS, as well as the interactions and dependencies between each of these MIB modules. [RFC4377] describes the requirements for user and data plane OAM and applications for MPLS. [RFC5654] describes the requirements for the optional use of a control plane to support dynamic provisioning of MPLS-TP transport paths. The MPLS-TP LSP control plane is based on GMPLS and is described in [RFC3945]. 5.2. An Introduction to the MPLS and Pseudowire MIB Modules 5.2.1. Structure of the MPLS MIB OID Tree The MPLS MIB OID tree has the following structure compatible for MPLS-TP. Farrel & King, et al. [Page 5] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 mib-2 -- RFC 2578 [RFC2578] | +-transmission | | | +- mplsStdMIB | | | | | +- mplsTCStdMIB -- MPLS-TC-STD-MIB [RFC3811] | | | | | +- mplsLsrStdMIB -- MPLS-LSR-STD-MIB [RFC3813] | | | | | +- mplsTeStdMIB -- MPLS-TE-STD-MIB [RFC3812] | | | | | +- mplsLdpStdMIB -- MPLS-LDP-STD-MIB [RFC3815] | | | | | +- mplsLdpGenericStdMIB -- MPLS-LDP-GENERIC-STD-MIB | | | | | +- mplsFTNStdMIB -- MPLS-FTN-STD-MIB [RFC3814] | | | | | +- gmplsTCStdMIB -- GMPLS-TC-STD-MIB [RFC4801] | | | | | +- gmplsTeStdMIB -- GMPLS-TE-STD-MIB [RFC4802] | | | | | +- gmplsLsrStdMIB -- GMPLS-LSR-STD-MIB [RFC4803] | | | | | +- gmplsLabelStdMIB -- GMPLS-LABEL-STD-MIB [RFC4803] | | | +- teLinkStdMIB -- TE-LINK-STD-MIB [RFC4220] | | | +- pwStdMIB -- PW-STD-MIB [RFC5601] | +- ianaGmpls -- IANA-GMPLS-TC-MIB [RFC4802] | +- ianaPwe3MIB -- IANA-PWE3-MIB [RFC5601] | +- pwEnetStdMIB -- PW-ENET-STD-MIB [RFC5603] | +- pwMplsStdMIB -- PW-MPLS-STD-MIB [RFC5602] | +- pwTDMMIB -- PW-TDM-MIB [RFC5604] | +- pwTcStdMIB -- PW-TC-STD-MIB [RFC5542] Note: The OIDs for MIB modules are assigned and managed by IANA. They can be found in the referenced MIB documents. 5.2.2. Textual Convention Modules MPLS-TC-STD-MIB [RFC3811] contains the Textual Conventions for Multiprotocol Label Switching (MPLS) networks. These Textual Conventions should be imported by MIB modules which manage MPLS networks. Farrel & King, et al. [Page 6] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 5.2.3. Mapping Data to LSPs MPLS is a packet switching protocol that operates between the Network layer and the data link layer in the OSI model. There is a clean separation between the control and forwarding planes in the MPLS protocol. This helps in easy portability and extensibility to the forwarding functions. A router which supports MPLS is known as a "Label Switching Router", or LSR. An LSR implements the control and forwarding plane of MPLS. The LSR "control plane" provides information in terms of label bindings which are part of the information used to populate forwarding tables in an LSR. An LSR determines which label bindings to seek and retain based on configuration and other information. The LSR forwarding plane then uses an index which is the incoming interface and label (usually of 20-bit length) to forward the packet. Each entry in this forwarding table corresponds to a forwarding equivalence class (FEC). This can be loosely defined as the set of characteristics that are being shared by the packets which will be forwarded in a similar fashion and may share the same label. MPLS packets are encapsulated by one more more label entries referred to as the label stack. Each label stack entry consists of a label, the 3 TC-bits for classifying the Traffic Class, the bottom of stack bit, and TTL. The ingress and the egress devices of the MPLS network are called Label Edge routers. These routers "Push" an MPLS label into an incoming packet and "pop" off the MPLS label from an outgoing packet respectively. At the ingress when an unlabeled packet enters, one or more label stack entries are (each label stack with one or more labels) is prefixed to this packet based on its FEC as discussed above. In addition, the "MPLS-specific" L2 encapsulation (including, for instance, the MPLS PID) is also added at the ingress. Then the packet is sent to the next-hop router for further processing. The next-hop router examines the topmost label in the label stack and then does a swap, 'push' or 'pop' operations based on the contents. A label stack entry can be 'popped' or removed from the top of the label stack or a label stack entry is 'pushed' or inserted into the top of the stack based on the FEC information. Farrel & King, et al. [Page 7] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 When a 'swap' operation is executed, the topmost label stack entry is replaced with a different one and the depth of the label stack remains the same. After the swap the packet is forwarded based on the new entry. 5.2.4. Label Switching Router Modules MPLS-LSR-STD-MIB [RFC3813] describes the managed objects for modeling a Multiprotocol Label Switching (MPLS) [RFC3031] LSR. MPLS-TP is specific to the use of MPLS in transport networks. According to [RFC5654] multipoint-to-point LSPs do not form part of MPLS-TP, so multipoint-to-point cross connects are not configured in this MIB module for use in MPLS-TP. 5.2.5. Label Switched Path Modules The path taken through the MPLS domain by a packet is referred to as a label switched path (LSP). It is possible that this path may not be understood or completely stored in one LSR within the MPLS domain. This label switched path can be programmed using a variety of mechanisms. These include manual programming and using a signalling protocol. RSVP-TE (Resource reservation protocol for Traffic Engineering) is normally used for signalling LSPs used for Traffic Engineering. 5.2.6. Pseudowire Modules The PW (Pseudowire) MIB modules architecture provides a layered modular model into which any supported emulated service can be connected to any supported packet switched network (PSN) type. This specific MIB module provides the glue for mapping between the emulated service onto the native PSN service. As such, the defining of a PW emulated service requires the use of at least three types of MIB modules. Starting from the emulated service, the first type is a service- specific module, which is dependent on the emulated signal type. These modules are defined in other documents. The second type is this module, the PW-STD-MIB module, which configures general parameters of the PW that are common to all types of emulated services and PSN types. The third type of module is a PSN-specific module. There is a different module for each type of PSN. These modules associate the PW with one or more "tunnels" that carry the service over the PSN. These modules are defined in other documents. Farrel & King, et al. [Page 8] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 PW-STD-MIB [RFC5601] defines a MIB module that can be used to manage pseudowire (PW) services for transmission over a Packet Switched Network (PSN) [RFC3931] [RFC4447]. This MIB module provides generic management of PWs that is common to all types of PSN and PW services defined by the IETF PWE3 Working Group. PW-MPLS-STD-MIB [RFC5602] describes a model for managing pseudowire services for transmission over different flavors of MPLS tunnels. The general PW MIB module [RFC5601] defines the parameters global to the PW regardless of the underlying Packet Switched Network (PSN) and emulated service. This document is applicable for PWs that use MPLS PSN type in the PW-STD-MIB. This document describes the MIB objects that define pseudowire association to the MPLS PSN, in a way that is not specific to the carried service. Together, [RFC3811] and [RFC3812] describe the modeling of an MPLS tunnel, and a tunnel's underlying cross-connects. This MIB module supports MPLS-TE PSN, non-TE MPLS PSN (an outer tunnel created by the Label Distribution Protocol (LDP) or manually), and MPLS PW label only (no outer tunnel). PW-ENET-STD-MIB [RFC5603] describes a model for managing Ethernet pseudowire services for transmission over a PSN. This MIB module is generic and common to all types of PSNs supported in the Pseudowire Emulation Edge-to-Edge (PWE3) architecture [RFC3985], which describes the transport and encapsulation of L1 and L2 services over supported PSN types. In particular, the MIB module associates a port or specific VLANs on top of a physical Ethernet port or a virtual Ethernet interface (for Virtual Private LAN Service (VPLS)) to a point-to-point PW. It is complementary to the PW-STD-MIB [RFC5601], which manages the generic PW parameters common to all services, including all supported PSN types. PW-TDM-MIB [RFC5604] describes a model for managing TDM pseudowires, i.e., TDM data encapsulated for transmission over a Packet Switched Network (PSN). The term TDM in this document is limited to the scope of Plesiochronous Digital Hierarchy (PDH). It is currently specified to carry any TDM Signals in either Structure Agnostic Transport mode (E1, T1, E3, and T3) or in Structure Aware Transport mode (E1, T1, and NxDS0) as defined in the Pseudowire Emulation Edge-to-Edge (PWE3) TDM Requirements document [RFC4197]. The PW MIB modules architecture provides a layered modular model into which any supported emulated service can be connected to any supported PSN type. This specific MIB module provides the glue for mapping between the emulated service onto the native PSN service. As such, the defining of a PW emulated service requires the use of at least three types of MIB modules. Farrel & King, et al. [Page 9] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 5.2.7. Routing and Traffic Engineering In MPLS traffic engineering, its possible to specify explicit routes or choose routes based on QOS metrics in setting up a path such that some specific data can be routed around network hot spots. MPLS-TE-STD-MIB [RFC3812] describes managed objects for modeling a Multiprotocol Label Switching (MPLS) [RFC3031] based traffic engineering. This MIB module should be used in conjunction with the companion document [RFC3813] for MPLS based traffic engineering configuration and management. 5.2.8. Resiliency MPLS Fast Reroute is a local restoration network resiliency mechanism in MPLS TE for link and node protection. Two different modes of local protection are described in the [RFC4090] to protect LSP. o One-to-One Backup o Facility Backup Facility backup uses label stacking to reroute multiple protected TE LSPs using a single backup TE LSP. One-to-one backup does not use label stacking, and every protected TE LSP requires a dedicated backup TE LSP. MPLS-FRR-GENERAL-STD-MIB [draft-ietf-mpls-fastreroute-mib-14] contains objects that apply to any MPLS LSR implementing MPLS TE fast reroute functionality. MPLS-FRR-ONE2ONE-STD-MIB [draft-ietf-mpls-fastreroute-mib-14] contains objects that apply to one-to-one backup method. MPLS-FRR-FACILITY-STD-MIB [draft-ietf-mpls-fastreroute-mib-14] contains objects that apply to facility backup method. 5.2.9. Fault Management and Performance Management MPLS manages the LSP and Pseudowire faults through LSP ping [RFC4379], VCCV [RFC5085], BFD for LSPs [RFC5884] and BFD for VCCV [RFC5885] tools. There is no MIB management model currently available for the above fault management tools. There is no performance management tool currently available for MPLS. Farrel & King, et al. [Page 10] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 5.2.10. MIB Module Interdependencies This section provides an overview of the relationship between the MPLS MIB modules for managing MPLS networks. More details of these relationships are given below. The relationship "A --> B" means A depends on B and that MIB module A uses an object, object identifier, or textual convention defined in MIB module B, or that MIB module A contains a pointer (index or RowPointer) to an object in MIB module B. +-------> MPLS-TC-STD-MIB <-----------------------------------------+ | ^ | | | | | MPLS-LSR-STD-MIB <--------------------------------+ | | | | +<----------------------- MPLS-LDP-STD-MIB ---------------->+ | | ^ | | | | | | +<-- MPLS-LDP-GENERIC-STD-MIB ------>+ | | | | | +<------ MPLS-FTN-STD-MIB ---------+----------------------->+ | | ^ | | | | | | +<------------- MPLS-TE-STD-MIB ->+ | ^ | GMPLS-TC-STD-MIB ------------>+ | | ^ | | | | | | +---+ +<-- GMPLS-LABEL-STD-MIB -->+ | | ^ ^ ^ | | | | | | | +----> PW-TC-STD-MIB | | GMPLS-LSR-STD-MIB --------------->+ | | | ^ ^ | | | | | | | | IANA-PWE3-MIB | | | | IANA-GMPLS-TC-MIB | | ^ | | | | ^ | | | | | | | | | | | | +<--- GMPLS-TE-STD-MIB ------------->+ | | | ^ | +<--- PW-STD-MIB <------+ | | | | | | | | +<--- PW-ENET-STD-MIB ->+ | | | | ^ | | | | | | | | +<---------------- PW-MPLS-STD-MIB -------------------------------->+ Thus: - All the MPLS MIB modules depend on MPLS-TC-STD-MIB. Farrel & King, et al. [Page 11] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 - All the GMPLS MIB modules depend on GMPLS-TC-STD-MIB. - All the PW MIB modules depend on PW-TC-STD-MIB. - MPLS-LDP-STD-MIB, MPLS-TE-STD-MIB, MPLS-FTN-STD-MIB, GMPLS-LSR-STD-MIB, and PW-MPLS-STD-MIB contain references to objects in MPLS-LSR-STD-MIB. - MPLS-LDP-GENERIC-STD-MIB contains references to objects in MPLS-LDP-STD-MIB. - MPLS-FTN-STD-MIB, PW-MPLS-STD-MIB, and GMPLS-TE-STD-MIB contain references to objects in MPLS-TE-STD-MIB. - PW-MPLS-STD-MIB, and PW-ENET-STD-MIB contains references to objects in PW-STD-MIB. - PW-STD-MIB contains references to objects in IANA-PWE3-MIB. - GMPLS-TE-STD-MIB contains references to objects in IANA-GMPLS-TC-MIB. - GMPLS-LSR-STD-MIB contains references to objects in GMPLS-LABEL-STD-MIB. Note that there is a textual convention (MplsIndexType) defined in MPLS-LSR-STD-MIB that is imported by MPLS-LDP-STD-MIB. 5.2.11. Dependencies on External MIB Modules In addition to the MPLS management overview [RFC4221] section 4.12 (Dependencies on External MIB Modules), some of the existing MPLS MIBs, PW MIBs and GMPLS MIBs are re-used with extensions for achieving the MPLS-TP functionality. MPLS MIB modules have dependencies with the TE-LINK-STD-MIB for maintaining the traffic engineering information. MPLS MIB modules depend on the CSPF module to get the paths for MPLS tunnel to traverse to reach the end point of the tunnel and BFD module to verify the data-plane failures of LSPs and PWs. Finally, all of the MIB modules import standard textual conventions such as integers, strings, timestamps, etc., from the MIB modules in which they are defined. This is business as usual for a MIB module and is not discussed further in this document. Farrel & King, et al. [Page 12] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 6. Applicability of MPLS MIB modules to MPLS-TP [RFC5951] specifies the requirements for the management of equipment used in networks supporting an MPLS-TP. It also details the essential network management capabilities for operating networks consisting of MPLS-TP equipment. [RFC5950] provides the network management framework for MPLS-TP. The document explains how network elements and networks that support MPLS-TP can be managed using solutions that satisfy the requirements defined in [RFC5951]. The relationship between MPLS-TP management and OAM is described in the MPLS-TP framework [RFC5950] document. Fault management and performance management form key parts of Operations, Administration, and Maintenance (OAM) function. MPLS-TP OAM is described in [MPLS-TP-OAM-FWK]. This section also provides the information about the extensions of existing MPLS MIB modules for MPLS-TP and the new MPLS-TP MIB modules. 6.1 Gap Analysis 6.1.1 MPLS-TP Tunnel MPLS-TP tunnel table MPLSTP-STD-MIB is an extension of MPLS tunnel table [RFC3812] to support MPLS-TP requirements. Tunnel identifiers are defined based on [MPLS-TP-IDENTIFIERS]. 6.1.2 MPLS-TP Pseudowire MPLS-TP Pseudowire table MPLSTP-STD-MIB is an extension of Pseudowire table MPLS-PW-STD-MIB to support MPLS-TP requirements. Pseudowire identifiers are defined based on [MPLS-TP-IDENTIFIERS]. 6.1.3 MPLS-TP Sections This section needs to be updated with the section layer network managed objects based on the draft-ietf-mpls-tp-data-plane-04.txt (Section 3.2.) draft. 6.1.4 MPLS-TP OAM MPLS-LSP-PING-STD-MIB describes managed objects used to model and manage the MPLS LSP ping [RFC4379]. LSP ping is used for connectivity verification and fault isolation in an MPLS LSPs. PW-VCCV-STD-MIB describes managed objects used to model and manage the VCCV [RFC5085]. VCCV used for end-to-end fault detection and diagnostics for a Pseudowire. Farrel & King, et al. [Page 13] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 BFD-MPLS-STD-MIB describes the managed objects for modeling the BFD for MPLS LSPs [RFC5884]. BFD for LSPs used for detecting MPLS LSP data plane failures. BFD-PW-VCCV-STD-MIB describes the managed objects for modeling the BFD for Pseudowires [RFC5885]. BFD for Pseudowires used for detecting data plane failures. MPLS-LSP-PING-STD-MIB, PW-VCCV-STD-MIB, BFD-MPLS-STD-MIB and BFD-PW-VCCV-STD-MIB are newly defined for MPLS. The new MPLS-TP managed objects for LSP ping and BFD are based on draft-ietf-mpls-tp-lsp-ping-bfd-procedures-00. All MPLS-TP managed for OAM is defined in the MPLSTP-OAM-STD-MIB. MPLSTP-TC-STD-MIB describes the textual conventions used for MPLS-TP. MPLSTP-STD-MIB describes managed objects used to model and manage the new extensions for LSPs, section and Pseudowires for IP and non-IP packet based MPLS-TP transport networks. The following MPLS-TP OAM functionalities can be achieved using the MPLSTP-OAM-STD-MIB mib extensions: o Continuity Check and Connectivity Verification, o Alarm Reporting, Diagnostic, o Route Tracing, o Loopback tool, o Lock Instruct, o Lock Reporting Remote Defect Indication, o Client Failure Indication, o Packet Loss Measurement and o Packet Delay Measurement MPLS-TP OAM managed objects are defined based on the drafts: o draft-ietf-mpls-tp-oam-requirements-06, o draft-ietf-mpls-tp-oam-framework-06 and o draft-ietf-mpls-tp-identifiers-01 6.1.5 MPLS-TP Protection Switching An important aspect that MPLS-TP technology provides is protection switching. In general, the mechanism of protection switching can be described as the substitution of a protection or standby facility for a working or primary facility. An MPLS-TP protection switching can be managed with the following parameters: Farrel & King, et al. [Page 14] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 o Topology (linear, ring, mesh) o Protection architecture (1+1, 1:1, or others as defined in different topologies) o Switching type (unidirectional, bidirectional) o Operation mode (revertive, non-revertive) o Automatic protection channel o Protection state o Position of the switch o Timer values (hold-off, Wait-to-Restore) o Failure of protocol Among those parameters for protection switching, the topology on that a protection switching applies has the most significant influence on the other parameters. Besides, the mechanism of a particular protection switching heavily depends on its topology. Therefore, three MIB modules are to be defined to model and manage each of three different topologies protection switching. MPLSTP-LPS-STD-MIB describes managed objects used to model and manage the linear protection switching. MPLSTP-RPS-STD-MIB describes managed objects used to model and manage the ring protection switching. MPLSTP-MPS-STD-MIB describes managed objects used to model and manage the mesh protection switching. 6.1.6 MIB Module Interdependencies This section provides an overview of the relationship between the MPLS-TP MIB modules. More details of these relationships are given below. The arrows in the following diagram show a 'depends on' relationship. A relationship "MIB module A depends on MIB module B" means that MIB module A uses an object, object identifier, or textual convention defined in MIB module B, or that MIB module A contains a pointer (index or RowPointer) to an object in MIB module B. Farrel & King, et al. [Page 15] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 +-------------->MPLSTP-TC-STD-MIB <--------------------------+ | | | MPLS-TE-STD-MIB PW-STD-MIB | | ^ ^ | | | | | +<----------- MPLSTP-STD-MIB <-------------------------------+ | ^ | | | +---------> MPLS-LSP-PING-STD-MIB | | | ^ ^ ^ | | | | | | | | | | PW-VCCV-STD-MIB | | | | | ^ ^ | | | | | | | | | | | BFD-MPLS-STD-MIB | | | | | ^ +----------+ | | | | | ^ | | | | | | | | +<----------- MPLSTP-OAM-STD-MIB ------------->+ | ^ | | | +- MPLSTP-LPS-STD-MIB -------------------->+ | | +- MPLSTP-RPS-STD-MIB -------------------->+ | | +- MPLSTP-MPS-STD-MIB -------------------->+ Thus: - All the MPLS-TP MIB modules depend on MPLSTP-TC-STD-MIB. - MPLSTP-OAM-STD-MIB and MPLSTP-PS-STD-MIB contain references to objects in MPLSTP-STD-MIB. - MPLSTP-PS-STD-MIB contains references to objects in MPLSTP-OAM-STD-MIB. - MPLSTP-STD-MIB contains references to objects in MPLS-TE-STD-MIB and PW-STD-MIB. - MPLSTP-OAM-STD-MIB contains references to objects in MPLS-LSP-PING-STD-MIB, and PW-VCCV-STD-MIB and BFD-MPLS-STD-MIB. - BFD-MPLS-STD-MIB contains references to objects in MPLS-LSP-PING-STD-MIB and PW-VCCV-STD-MIB. - PW-VCCV-STD-MIB contains references to objects in MPLS-LSP-PING-STD-MIB. Farrel & King, et al. [Page 16] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 7. Interfaces MPLS-TP can be carried over the existing and evolving physical transport technologies such as SONET/SDH, OTN/WDM, and Ethernet. The Interfaces Group of IF-MIB [RFC2863] defines generic managed objects for managing interfaces. The MPLS-TP MIB modules make references to interfaces so that it can be clearly determined where the procedures managed by the MIB modules should be performed. Additionally, the MPLS-TP MIB modules (notably MPLS-TE-STD-MIB and TE-LINK-STD-MIB, PW-STD-MIB) utilize interface stacking within the Interface Group. Please refer to section 4. (Node and Interface Identifiers) in [MPLS-TP-IDENTIFIERS] for more information on MPLS-TP specific interfaces. 7.1. MPLS Tunnels as Interfaces mplstpTunnelTable is extended from mplsTunnelTable for achieving the MPLS-TP tunnel requirements. MPLS Tunnel logical interfaces can be stacked over PDH/SDH/OTH/Ethernet physical interfaces. For more information on Tunnel interfaces, refer section 11.1 (MPLS Tunnels as Interfaces) of RFC-4221. 7.2. Application of the Interfaces Group to TE Links TE links can be formed over PDH/SDH/OTH/Ethernet physical interfaces. For more information on TE links, Refer section 11.2. Application of the Interfaces Group to TE Links of RFC-4221. 7.3. References to Interface Objects from MPLS MIB Modules MPLSTP-STD-MIB includes the extensions of Tunnel table, PW table for MPLS-TP. More information on Tunnel interfaces can be found in the RFC-3812, section 8. (Application of the Interface Group to MPLS Tunnels) The PW in general is not an ifIndex on its own, for agent scalability reasons. The PW is typically associated via the PWE3 MIB modules to an ifIndex (physical entity) the PW is emulating. Some implementations may manage the PW as an ifIndex in the ifTable. A special ifType to represent a PW virtual interface (246) will be used in the ifTable in this case. More information on PW interfaces can be found in the RFC-5601, section 8 (PW relations to the IF-MIB). Farrel & King, et al. [Page 17] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 8. Management Options It is not the intention of this document to provide instructions or advice to implementers of management systems, management agents, or managed entities. It is, however, useful to make some observations about how the MIB modules described above might be used to manage MPLS systems. For MPLS specific management options, refer [RFC4221] Section 12 (Management Options). [Editors Note: MPLS-TP specific management gaps and options will be documented in this document and will be referenced here.] 9. Security Considerations This document describes the interrelationships amongst the different MIB modules relevant to MPLS-TP management and as such does not have any security implications in and of itself. Each IETF MIB document that specifies MIB objects for MPLS-TP must provide a proper security considerations section that explains the security aspects of those objects. The attention of readers is particularly drawn to the security implications of making MIB objects available for create or write access through an access protocol such as SNMP. SNMPv1 by itself is an insecure environment. Even if the network itself is made secure (for example, by using IPSec), there is no control over who on the secure network is allowed to access the objects in this MIB. It is recommended that the implementers consider the security features as provided by the SNMPv3 framework. Specifically, the use of the User-based Security Model STD 62, RFC3414 [RFC3414], and the View-based Access Control Model STD 62, RFC 3415 [RFC3415], is recommended. It is then a customer/user responsibility to ensure that the SNMP entity giving access to an instance of each MIB module is properly configured to give access to only those objects, and to those principals (users) that have legitimate rights to access them. 10. IANA Considerations This document makes no requests for IANA action. 11. Acknowledgements The authors would like to thank Eric Gray, Thomas Nadeau and Benjamin Niven-Jenkins for their valuable comments. Farrel & King, et al. [Page 18] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 12. References 12.1 Normative References [RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB using SMIv2", RFC 2863, June 2000. [RFC3811] Nadeau, T. and J. Cucchiara, "Definition of Textual Conventions and for Multiprotocol Label Switching (MPLS) Management", RFC 3811, June 2004. [RFC3812] Srinivasan, C., Viswanathan, A., and T. Nadeau, "Multiprotocol Label Switching (MPLS) Traffic Engineering (TE) Management Information Base (MIB)", RFC 3812, June 2004. [RFC3813] Srinivasan, C., Viswanathan, A., and T. Nadeau, "Multiprotocol Label Switching (MPLS) Label Switching (LSR) Router Management Information Base (MIB)", RFC 3813, June 2004. [RFC3814] Nadeau, T., Srinivasan, C., and A. Viswanathan, "Multiprotocol Label Switching (MPLS) FEC-To-NHLFE (FTN) Management Information Base", RFC3814, June 2004. [RFC3815] Cucchiara, J., Sjostrand, H., and Luciani, J., "Definitions of Managed Objects for the Multiprotocol Label Switching (MPLS), Label Distribution Protocol (LDP)", RFC 3815, June 2004. [RFC4220] Dubuc, M., Nadeau, T., and J. Lang, "Traffic Engineering Link Management Information Base", RFC 4220, November 2005. [RFC4221] Nadeau, T., Srinivasan, C., and A. Farrel, "Multiprotocol Label Switching (MPLS) Management Overview", RFC 4221, November 2005. [RFC4801] T. Nadeau and A. Farrel, Ed., "Definitions of Textual Conventions for Generalized Multiprotocol Label Switching (GMPLS) Management", RFC4801, Feb. 2007. [RFC4802] T. D. Nadeau and A. Farrel, "Generalized Multiprotocol Label Switching (GMPLS) Traffic Engineering Management Information Base", RFC4802, Feb., 2007. [RFC4803] T. D. Nadeau and A. Farrel, "Generalized Multiprotocol Label Switching (GMPLS) Label Switching Router (LSR) Management Information Base", RFC4803, Feb., 2007. Farrel & King, et al. [Page 19] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 [RFC5542] Nadeau, T., Ed., Zelig, D., Ed., and O. Nicklass, Ed., "Definitions of Textual Conventions for Pseudowire (PW) Management", RFC 5542, May 2009. [RFC5601] Nadeau, T., Ed. and D. Zelig, Ed. "Pseudowire (PW) Management Information Base (MIB)", RFC 5601, July 2009. [RFC5602] Zelig, D., Ed., and T. Nadeau, Ed., "Pseudowire (PW) over MPLS PSN Management Information Base (MIB)", RFC 5602, July 2009. [RFC5603] Zelig, D., Ed., and T. Nadeau, Ed., "Ethernet Pseudowire (PW) Management Information Base (MIB)", RFC 5603, July 2009. [RFC5604] Nicklass, O., "Managed Objects for Time Division Multiplexing (TDM) over Packet Switched Networks (PSNs)", RFC5604, July 2009. 12.2 Informative References [RFC2578] McCloghrie, K., Perkins, D., and J. Schoenwaelder, "Structure of Management Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999. [RFC2579] McCloghrie, K., Perkins, D., and J. Schoenwaelder, "Textual Conventions for SMIv2", STD 58, RFC 2579, April 1999. [RFC2580] McCloghrie, K., Perkins, D., and J. Schoenwaelder, "Conformance Statements for SMIv2", STD 58, RFC 2580, April 1999. [RFC3031] Rosen, E., Viswanathan, A., and R. Callon, "Multiprotocol Label Switching Architecture", RFC 3031, January 2001. [RFC3410] Case, J., Mundy, R., Partain, D. and B. Stewart, "Introduction and Applicability Statements for Internet-Standard Management Framework", RFC 3410, December 2002. [RFC3414] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)", STD 62, RFC 3414, December 2002. [RFC3415] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)", STD 62, RFC 3415, December 2002. Farrel & King, et al. [Page 20] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 [RFC3931] Lau, J., Townsley, M., and I. Goyret, "Layer Two Tunneling Protocol - Version 3 (L2TPv3)", RFC 3931, March 2005. [RFC3945] Mannie, E. et.al., "Generalized Multi-Protocol Label Switching (GMPLS) Architecture", IETF RFC 3945, October 2004. [RFC3985] Bryant, S. and P. Pate, "Pseudo Wire Emulation Edge-to- Edge (PWE3) Architecture", RFC 3985, March 2005. [RFC4090] Pan, P., Ed., Swallow, G., Ed., and A. Atlas, Ed., "Fast Reroute Extensions to RSVP-TE for LSP Tunnels", RFC 4090, May 2005. [RFC4197] Riegel, M., "Requirements for Edge-to-Edge Emulation of Time Division Multiplexed (TDM) Circuits over Packet Switching Networks", RFC4197, October 2005. [RFC4377] Nadeau, T., Morrow, M., Swallow, G., Allan, D., and S. Matsushima, "Operations and Management (OAM) Requirements for Multi-Protocol Label Switched (MPLS) Networks", RFC 4377, February 2006. [RFC4378] Allan, D. and T. Nadeau, "A Framework for Multi-Protocol Label Switching (MPLS) Operations and Management (OAM)", RFC 4378, February 2006. [RFC4379] Kompella, K. and G. Swallow, "Detecting Multi-Protocol Label Switched (MPLS) Data Plane Failures", RFC 4379, February 2006. [RFC4447] Martini, L., Rosen, E., El-Aawar, N., Smith, T., and G. Heron, "Pseudowire Setup and Maintenance Using the Label Distribution Protocol (LDP)", RFC 4447, April 2006. [RFC5085] Nadeau, T. and C. Pignataro, "Pseudowire Virtual Circuit Connectivity Verification (VCCV): A Control Channel for Pseudowires", RFC 5085, December 2007. [RFC5654] Niven-Jenkins, B., et al, "MPLS-TP Requirements", RFC5654, September 2009. [RFC5884] Aggarwal, R., Kompella, K., Nadeau, T., and G. Swallow, "Bidirectional Forwarding Detection (BFD) For MPLS Label Switched Paths (LSPs)", RFC 5884, June 2010. Farrel & King, et al. [Page 21] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 [RFC5885] Nadeau, T. and C. Pignataro, "Bidirectional Forwarding Detection (BFD) for the Pseudowire Virtual Circuit Connectivity Verification (VCCV)", RFC5885, June 2010. [RFC5950] Gray, E., Mansfield, S., Lam, K., "MPLS-TP Network Management Framework", RFC 5950, September 2010. [RFC5951] Gray, E., Mansfield, S., Lam, K., "MPLS TP Network Management Requirements", RFC 5951, September 2010. [MPLS-TP-IDENTIFIERS] Bocci, M., Swallow, G., "MPLS-TP Identifiers" draft-ietf-mpls-tp-identifiers-03, October 2010. [MPLS-TP-OAM-FWK] Busi, I. and B. Niven-Jenkins, "MPLS-TP OAM Framework and Overview", 2009, . 14. Authors' Addresses Adrian Farrel Old Dog Consulting UK Email: adrian@olddog.co.uk Daniel King Old Dog Consulting UK Email: daniel@olddog.co.uk Venkatesan Mahalingam Aricent India Email: venkatesan.mahalingam@aricent.com Scott Mansfield Ericsson 300 Holger Way San Jose, CA 95134 US Phone: +1 724 931 9316 Email: scott.mansfield@ericsson.com Jeong-dong Ryoo ETRI 161 Gajeong, Yuseong, Daejeon, 305-700, South Korea Phone: +82 42 860 5384 Email: ryoo@etri.re.kr Farrel & King, et al. [Page 22] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010 A S Kiran Koushik Cisco Systems Inc. Email: kkoushik@cisco.com Farrel & King, et al. [Page 23] draft-ietf-mpls-tp-mib-management-overview-00.txt November 2010