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RFC 7453

MPLS Transport Profile (MPLS-TP) Traffic Engineering (TE) Management Information Base (MIB)

Pages: 62
Proposed Standard
Part 1 of 3 – Pages 1 to 13
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Top   ToC   RFC7453 - Page 1
Internet Engineering Task Force (IETF)                     M. Venkatesan
Request for Comments: 7453                                     Dell Inc.
Category: Standards Track                                     K. Sampath
ISSN: 2070-1721                                                   Redeem
                                                               S. Aldrin
                                                     Huawei Technologies
                                                               T. Nadeau
                                                                 Brocade
                                                           February 2015


       MPLS Transport Profile (MPLS-TP) Traffic Engineering (TE)
                   Management Information Base (MIB)

Abstract

This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes additional managed objects and textual conventions for tunnels, identifiers, and Label Switching Routers to support Multiprotocol Label Switching (MPLS) MIB modules for transport networks. 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/rfc7453.
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Copyright Notice

   Copyright (c) 2015 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 ....................................................4 2. The Internet-Standard Management Framework ......................5 3. Overview ........................................................5 3.1. Conventions Used in This Document ..........................5 3.2. Terminology ................................................6 3.3. Acronyms ...................................................6 4. Motivations .....................................................6 5. Feature List ....................................................7 6. Outline .........................................................7 6.1. MIB Module Extensions ......................................8 6.1.1. Summary of MIB Module Changes .......................8 6.2. MPLS-TE-EXT-STD-MIB ........................................9 6.2.1. mplsTunnelExtNodeConfigTable ........................9 6.2.2. mplsTunnelExtNodeIpMapTable .........................9 6.2.3. mplsTunnelExtNodeIccMapTable .......................10 6.2.4. mplsTunnelExtTable .................................10 6.3. MPLS-TC-EXT-STD-MIB .......................................10 6.4. MPLS-ID-STD-MIB ...........................................10 6.5. MPLS-LSR-EXT-STD-MIB ......................................11 6.6. The Use of RowPointer .....................................11 7. MIB Modules' Interdependencies .................................11 8. Dependencies between MIB Module Tables .........................13 9. Example of MPLS-TP Tunnel Setup ................................13 9.1. Example of MPLS-TP Static Co-routed Bidirectional Tunnel Setup ..............................................15 9.1.1. mplsTunnelEntry ....................................15 9.1.2. mplsTunnelExtEntry .................................16 9.1.3. Forward-Direction mplsOutSegmentEntry ..............16 9.1.4. Reverse-Direction mplsInSegmentEntry ...............16 9.1.5. Forward-Direction mplsXCEntry ......................17 9.1.6. Reverse-Direction mplsXCEntry ......................17
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           9.1.7. Forward-Direction mplsXCExtEntry ...................18
           9.1.8. Reverse-Direction mplsXCExtEntry ...................18
      9.2. Example of MPLS-TP Static Associated Bidirectional
           Tunnel Setup ..............................................18
           9.2.1. Forward-Direction mplsTunnelEntry ..................18
           9.2.2. Forward-Direction mplsTunnelExtEntry ...............19
           9.2.3. Forward-Direction mplsOutSegmentTable ..............20
           9.2.4. Forward-Direction mplsXCEntry ......................20
           9.2.5. Forward-Direction mplsXCExtEntry ...................20
           9.2.6. Reverse-Direction mplsTunnelEntry ..................21
           9.2.7. Reverse-Direction mplsTunnelExtEntry ...............22
           9.2.8. Reverse-Direction mplsInSegmentEntry ...............22
           9.2.9. Reverse-Direction mplsXCEntry ......................22
           9.2.10. Reverse-Direction mplsXCExtEntry ..................23
      9.3. Example of MPLS-TP Signaled Co-routed
           Bidirectional Tunnel Setup ................................23
           9.3.1. mplsTunnelEntry ....................................23
           9.3.2. mplsTunnelExtEntry .................................24
           9.3.3. Forward-Direction mplsOutSegmentEntry ..............24
           9.3.4. Reverse-Direction mplsInSegmentEntry ...............25
           9.3.5. Forward-Direction mplsXCEntry ......................25
           9.3.6. Reverse-Direction mplsXCEntry ......................25
           9.3.7. Forward-Direction mplsXCExtEntry ...................25
           9.3.8. Reverse-Direction mplsXCExtEntry ...................25
   10. MPLS Textual Convention Extension MIB Definitions .............26
   11. MPLS Identifier MIB Definitions ...............................29
   12. MPLS LSR Extension MIB Definitions ............................34
   13. MPLS Tunnel Extension MIB Definitions .........................39
   14. Security Considerations .......................................57
   15. IANA Considerations ...........................................58
      15.1. IANA Considerations for MPLS-TC-EXT-STD-MIB ..............58
      15.2. IANA Considerations for MPLS-ID-STD-MIB ..................58
      15.3. IANA Considerations for MPLS-LSR-EXT-STD-MIB .............58
      15.4. IANA Considerations for MPLS-TE-EXT-STD-MIB ..............59
   16. References ....................................................59
      16.1. Normative References .....................................59
      16.2. Informative References ...................................60
   Acknowledgments ...................................................62
   Authors' Addresses ................................................62
Top   ToC   RFC7453 - Page 4

1. Introduction

This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes additional textual conventions and managed objects for tunnels, identifiers, and Label Switching Routers to support Multiprotocol Label Switching (MPLS) MIB modules for transport networks. MIB modules defined in this document extend the existing MPLS MIB objects in such a way that they support the MPLS Transport Profile (MPLS-TP) but also other MPLS networks. Hence, "MPLS-TP" is not included in the MIB module names. As described in the MPLS Traffic Engineering (TE) MIB definition [RFC3812], MPLS traffic engineering is concerned with the creation and management of MPLS tunnels. This term is a shorthand for a combination of one or more LSPs linking an ingress and an egress LSR. Several types of point-to-point MPLS tunnels may be constructed between a pair of LSRs A and B: - Unidirectional with a single LSP (say, from A to B). - Associated bidirectional consisting of two separately routed LSPs, one linking A to B and the other linking B to A. Together, the pair provides a single logical bidirectional transport path. - Co-routed bidirectional consisting of an associated bidirectional tunnel but with the second LSP from B to A following the reverse of the path of the LSP from A to B, in terms of both nodes and links. Tunnels may be either statically configured by management action or dynamically created using an LSP management protocol. The existing MPLS TE MIB [RFC3812] and the GMPLS TE MIB [RFC4802] address only a subset of the combinations of statically and dynamically configured tunnel types, catering to statically configured unidirectional tunnels together with dynamically configured unidirectional and co-routed bidirectional tunnels. They are also restricted to two endpoint LSRs identified by IP addresses. The MPLS-TP TE MIB defined in this document extends the MIB modules defined in [RFC3812] to cover all six combinations (that is, adding support for statically configured associated and co-routed bidirectional plus dynamically configured associated bidirectional tunnels). It also extends support to endpoints that have identifiers other than IP addresses.
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   This support is provided by a suite of four MIB modules that are to
   be used in conjunction with the MIB modules defined in [RFC3812] and
   the companion document [RFC3813] for MPLS-TP tunnel management.

   At the time of writing, SNMP SET is no longer recommended as a way to
   configure MPLS networks as described in [RFC3812].  However, since
   the MIB modules specified in this document extend and are intended to
   work in parallel with the MIB modules for MPLS specified in
   [RFC3812], certain objects defined here are specified with MAX-ACCESS
   of read-write or read-create so that specifications of the base
   tables in [RFC3812] and the extensions in this document are
   consistent.  Although the examples described in Section 9 specify
   means to configure MPLS-TP Tunnels in a similar way to the examples
   in [RFC3812], this should be seen as indicating how the MIB values
   would be returned if the specified circumstances were configured by
   alternative means.

2. The Internet-Standard Management Framework

For a detailed overview of the documents that describe the current Internet-Standard Management Framework, please refer to section 7 of RFC 3410 [RFC3410]. 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). This memo specifies a MIB module that is compliant to the SMIv2, which is described in STD 58, RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580 [RFC2580].

3. Overview

3.1. Conventions Used in This Document

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].
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3.2. Terminology

This document uses terminology from the "Multiprotocol Label Switching Architecture" [RFC3031], "Multiprotocol Label Switching (MPLS) Traffic Engineering (TE) Management Information Base (MIB)" [RFC3812], "Multiprotocol Label Switching (MPLS) Label Switching Router (LSR) Management Information Base (MIB)" [RFC3813], and"MPLS Transport Profile (MPLS-TP) Identifiers" [RFC6370].

3.3. Acronyms

CC: Country Code ICC: ITU Carrier Code LSP: Label Switched Path LSR: Label Switching Router MPLS-TP: MPLS Transport Profile TE: Traffic Engineering TP: Transport Profile

4. Motivations

"Multiprotocol Label Switching (MPLS) Traffic Engineering (TE) Management Information Base (MIB)" [RFC3812] provides support for Traffic Engineering tunnels. In MPLS, the actual transport of packets is provided by Label Switched Paths (LSPs). A transport service may be composed of multiple LSPs. In order to clearly identify the MPLS-TP service, as defined in [RFC6370], we use the term "MPLS-TP Tunnel" or simply "tunnel". However, with MPLS-TP, the characteristics of the tunnels were enhanced. For example, MPLS-TP Tunnels are bidirectional in nature and could be used with non-IP identifiers for the tunnel endpoints. As the existing MPLS-TE-STD-MIB and GMPLS-TE-STD-MIB were defined mainly to support unidirectional tunnels and signaled co-routed bidirectional tunnel definitions, respectively, these existing MIB modules are not sufficient to capture all the characteristics of the tunnels. Hence, enhancing the MIB modules to support MPLS-TP Tunnels is required. As most of the attributes of MPLS Traffic Engineering tunnels are also applicable to MPLS-TP Tunnels, it is optimal to reuse and extend the existing MIB module definition instead of defining a new MIB module. This document defines four additional MIB modules, namely, MPLS-TE-EXT-STD-MIB, MPLS-TC-EXT-STD-MIB, MPLS-ID-STD-MIB, and MPLS-LSR-EXT-STD-MIB. As these additional MIB modules are required for MPLS-TP functionality, these are all defined in this document, instead of being documented separately.
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5. Feature List

The MIBs in this document satisfy the following requirements and constraints: The MIB modules, taken together, support statically configured and dynamically signaled point-to-point, co-routed bidirectional and associated bidirectional tunnels. - The MPLS tunnels need not be interfaces, but it is possible to configure an MPLS-TP Tunnel as an interface. The same ifType 150, as defined in Section 8 of [RFC3812], will be used for MPLS-TP Tunnels as well. - The mplsTunnelTable [RFC3812] is also to be used for MPLS-TP Tunnels. - New MPLS-TP-specific textual conventions and identifiers are required. - The mplsTunnelTable is sparsely extended to support objects specific to MPLS-TP Tunnels. - A node configuration table (mplsTunnelExtNodeConfigTable), as detailed in Section 6.2.1, below, is used to translate the Global_ID::Node_ID or ICC_Operator_ID::Node_ID to the local identifier in order to index the mplsTunnelTable. - The mplsXCTable is sparsely extended to support objects specific to MPLS-TP XC (Cross Connect). - The MIB module supports persistent, as well as non-persistent, tunnels.

6. Outline

Traffic Engineering support for the MPLS-TP Tunnels requires the setup of the co-routed or associated bidirectional tunnel. The tables and MIB modules that are mentioned in the below subsections support the functionality described in [RFC5654] and [RFC6370]. These tables support both IP-compatible and ICC-based tunnel configurations. Figure 1, below, depicts how the table references are followed in this MIB.
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            Tunnel1-->XC1<--------------
             ^ ^      | |               |
             | |      | |-->InSeg1      |
             | |      | |-->OutSeg1     |
             | |      v                 |
             |  ------XCext1            |
             |         |                |
             V         v                |
            Tunnel2-->XC1               |
               ^      | |               |
               |      | |-->InSeg2      |
               |      | |-->OutSeg2     |
               |      v                 |
                ------XCext2------------

                 Figure 1: Table References of MIB Modules

6.1. MIB Module Extensions

Four MIB modules are extended to support MPLS-TP Tunnels, namely, MPLS-TE-EXT-STD-MIB, MPLS-TC-EXT-STD-MIB, MPLS-ID-STD-MIB, and MPLS-LSR-EXT-STD-MIB. The following section provides the summary of changes.

6.1.1. Summary of MIB Module Changes

- Node configuration table (mplsTunnelExtNodeConfigTable) for setting the local identifier for Tunnel Ingress and Egress identifiers. - Node IP map table (mplsTunnelExtNodeIpMapTable) for querying the local identifier for a given Global_ID and Node_ID. - Node ICC map table (mplsTunnelExtNodeIccMapTable) for querying the local identifier for a given ICC_Operator_ID and Node_ID. - Tunnel extension table (mplsTunnelExtTable) for setting up MPLS-TP Tunnels with sparse extension of mplsTunnelTable. - Textual conventions and object definitions for MPLS-TP Tunnels. - Cross-connect extension table (mplsXCExtTable) for setting up the MPLS-TP LSPs. These tables are described in the subsequent sections.
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6.2. MPLS-TE-EXT-STD-MIB

The TE MIB module extensions and details of the tables are described in the following sections.

6.2.1. mplsTunnelExtNodeConfigTable

The mplsTunnelExtNodeConfigTable is used to assign a local identifier for a given ICC_Operator_ID::Node_ID or Global_ID::Node_ID combination as defined in [RFC6923] and [RFC6370], respectively. The CC is a string of two characters, each being an uppercase Basic Latin alphabetic (i.e., A-Z). The ICC is a string of one to six characters, each an uppercase Basic Latin alphabetic (i.e., A-Z) or numeric (i.e., 0-9). All of the characters are encoded using [T.50] as described in [RFC6370]. In the IP-compatible mode, Global_ID::Node_ID, is used to uniquely identify a node. For each ICC_Operator_ID::Node_ID or Global_ID::Node_ID, there is a unique entry in the table representing a node. As the regular TE tunnels use the IP address as the LSR ID, the local identifier should be below the first valid IP address, which is 16777216[1.0.0.0]. Every node is assigned a local identifier within a range of 0 to 16777215. This local identifier is used for indexing into mplsTunnelTable as mplsTunnelIngressLSRId and mplsTunnelEgressLSRId. For IP-compatible environments, an MPLS-TP Tunnel is indexed by Tunnel Index, Tunnel Instance, Source Global_ID, Source Node_ID, Destination Global_ID, and Destination Node_ID. For ICC-based environments, an MPLS-TP Tunnel is indexed by Tunnel Index, Tunnel Instance, Source CC, Source ICC, Source Node_ID, Destination CC, Destination ICC, and Destination Node_ID. As mplsTunnelTable is indexed by mplsTunnelIndex, mplsTunnelInstance, mplsTunnelIngressLSRId, and mplsTunnelEgressLSRId, the MPLS-TP tunnel identifiers cannot be used directly. The mplsTunnelExtNodeConfigTable will be used to store an entry for ICC_Operator_ID::Node_ID or Global_ID::Node_ID with a local identifier to be used as the LSR ID in mplsTunnelTable.

6.2.2. mplsTunnelExtNodeIpMapTable

The read-only mplsTunnelExtNodeIpMapTable is used to query the local identifier assigned and stored in mplsTunnelExtNodeConfigTable for a given Global_ID::Node_ID. In order to query the local identifier, in
Top   ToC   RFC7453 - Page 10
   the IP-compatible mode, this table is indexed with
   Global_ID::Node_ID.  In the IP-compatible mode for a TP tunnel,
   Global_ID::Node_ID is used.

   A separate query is made to get the local identifier of both Ingress
   and Egress Global_ID::Node_ID identifiers.  These local identifiers
   are used as mplsTunnelIngressLSRId and mplsTunnelEgressLSRId when
   indexing mplsTunnelTable.

6.2.3. mplsTunnelExtNodeIccMapTable

The read-only mplsTunnelExtNodeIccMapTable is used to query the local identifier assigned and stored in the mplsTunnelExtNodeConfigTable for a given ICC_Operator_ID::Node_ID. A separate query is made to get the local identifier of both Ingress and Egress ICC_Operator_ID::Node_ID. These local identifiers are used as mplsTunnelIngressLSRId and mplsTunnelEgressLSRId when indexing mplsTunnelTable.

6.2.4. mplsTunnelExtTable

This table sparsely extends the mplsTunnelTable in order to support MPLS-TP Tunnels with additional objects. All the additional attributes specific to supporting a TP tunnel are contained in this extended table and could be accessed with the mplsTunnelTable indices. The gmplsTunnelReversePerfTable [RFC4802] should be used to provide per-tunnel packet performance information for the reverse direction of a bidirectional tunnel. It can be seen as supplementing the mplsTunnelPerfTable, which augments the mplsTunnelTable.

6.3. MPLS-TC-EXT-STD-MIB

This MIB module contains textual conventions for LSPs of MPLS-based transport networks.

6.4. MPLS-ID-STD-MIB

This MIB module contains identifier object definitions for MPLS Traffic Engineering in transport networks.
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6.5. MPLS-LSR-EXT-STD-MIB

This MIB module contains generic object definitions (including the mplsXCExtTable -- cross-connect extension table -- for setting up the MPLS-TP LSPs with sparse extension of mplsXCTable) for MPLS LSRs in transport networks.

6.6. The Use of RowPointer

This document follows the RowPointer usage as described in Section 10 of [RFC3812]. A new RowPointer object, mplsTunnelExtOppositeDirPtr, is added to mplsTunnelExtTable of MPLS-TE-EXT-STD-MIB module. This RowPointer object points to the tunnel entry in the opposite direction. Two additional RowPointers objects, mplsXCExtTunnelPointer and mplsXCExtOppositeDirXCPtr, are added to the mplsXCExtTable of MPLS-LSR-EXT-STD-MIB. The RowPointer mplsXCExtTunnelPointer is a read-only object used to indicate the back pointer to the tunnel entry. The RowPointer mplsXCExtOppositeDirXCPtr object points to the opposite-direction XC entry. If either of these RowPointers return zeroDotZero, it implies that there is no entry associated with the RowPointer object.

7. MIB Modules' Interdependencies

This section provides an overview of the relationships between the MPLS-TP TE MIB module and other MPLS MIB modules. The arrows in the following diagram show a "depends on" relationship. A relationship of "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.
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       MPLS-TC-EXT-STD-MIB
          ^
          |
          |
          +<---- MPLS-ID-STD-MIB
                        ^
          |             |
          +<---- MPLS-TE-EXT-STD-MIB
          |             |
          |             V
          |      MPLS-TE-STD-MIB
          |             |
          |             |
          |             V
          |      MPLS-LSR-STD-MIB
          |             ^
          |             |
          |             |
          +------MPLS-LSR-EXT-STD-MIB

       Figure 2: MIB Modules' Interdependencies

       Thus:

      - All the new MPLS extension MIB modules depend on
        MPLS-TC-EXT-STD-MIB.

      - MPLS-ID-STD-MIB contains references to objects in
        MPLS-TE-STD-MIB [RFC3812].

      - MPLS-TE-EXT-STD-MIB contains references to objects in
        MPLS-TE-STD-MIB [RFC3812].

      - MPLS-LSR-EXT-STD-MIB contains references to objects in
        MPLS-LSR-STD-MIB [RFC3813].

   The mplsTunnelExtTable sparsely extends the mplsTunnelTable of
   MPLS-TE-STD-MIB [RFC3812].  This helps in associating the reverse-
   direction tunnel information.

   The mplsXCExtTable sparsely extends the mplsXCTable of
   MPLS-LSR-STD-MIB [RFC3813].  This helps in pointing back to the
   tunnel entry for easy tunnel access from the XC entry.

   Note that all of the MIB modules shown above in the figure also have
   a dependency on MPLS-TC-STD-MIB.
Top   ToC   RFC7453 - Page 13

8. Dependencies between MIB Module Tables

The tables in MPLS-TE-EXT-STD-MIB are related as shown on the diagram below. The arrows indicate a reference from one table to another. mplsTunnelExtNodeConfigTable ^ ^ ^ | | | | | | | | | | | +----------------------+ | | | | mplsTunnelExtNodeIpMapTable mplsTunnelExtNodeIccMapTable | | mplsXCExtTable | | ^ | +---------+ | | | | | | | | V V mplsTunnelTable ---->mplsXCTable ^ | | | mplsTunnelExtTable Figure 3: Dependencies between MIB Module Tables An existing mplsTunnelTable uses the mplsTunnelExtNodeConfigTable table to map the Global_ID::Node_ID and/or ICC_Operator_ID::Node_ID with the local number in order to accommodate in the existing tunnel table's ingress/egress LSR ID. The new mplsTunnelExtTable provides the reverse-direction LSP information for the existing tunnel table so that bidirectional LSPs can be created. The mplsXCExtTable sparsely extends the mplsLsrXCTable to provide backward reference to tunnel entry.


(page 13 continued on part 2)

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