Network Working Group
Request for Comments: 4368
Category: Standards Track

T. Nadeau
S. Hegde
Cisco Systems, Inc.
January 2006

Multiprotocol Label Switching (MPLS) Label-Controlled

Asynchronous Transfer Mode (ATM) and Frame-Relay

Management Interface Definition

Status of This Memo

This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Abstract

This memo defines two MIB modules and corresponding MIB Object Definitions that describe how label-switching-controlled Frame-Relay and Asynchronous Transfer Mode (ATM) interfaces can be managed given the interface stacking as defined in the MPLS-LSR-STD-MIB and MPLS-TE-STD-MIB.

   1. Introduction ....................................................2
   2. Terminology .....................................................2
   3. The SNMP Management Framework ...................................3
   4. Interface Stacking of LC-ATM ....................................3
   5. Structure of the MPLS-LC-ATM-STD-MIB Module .....................3
   6. Structure of the MPLS-LC-FR-STD-MIB Module ......................4
   7. MPLS Label-Controlled ATM MIB Definitions .......................5
   8. MPLS Label-Controlled Frame Relay MIB Definitions ..............12
   9. Acknowledgments ................................................18
   10. Security Considerations .......................................18
   11. IANA Considerations ...........................................19
      11.1. IANA Considerations for MPLS-LC-ATM-STD-MIB ..............19
      11.2. IANA Considerations for MPLS-LC-FR-STD-MIB ...............19
   12. References ....................................................20
      12.1. Normative References .....................................20
      12.2. Informative References ...................................21

1. Introduction

This memo defines how label-switching-controlled Frame-Relay [RFC3034] and ATM [RFC3035] interfaces can be realized given the interface stacking as defined in the MPLS-LSR-STD [RFC3813] and MPLS-TE-STD [RFC3812] MIBs. This document also contains a MIB module that sparsely extends the MPLS-LSR-STD MIB's mplsInterfaceConfTable in such a way as to identify which MPLS-type interfaces have LC-ATM or LC-FR capabilities. Comments should be made directly to the MPLS mailing list at mpls@uu.net.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED",  "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119, reference
   [RFC2119].

2. Terminology

This document uses terminology from the document describing the MPLS architecture [RFC3031], as well as from RFC 3035 and RFC 3034. Specifically, the following terms will be used in this document.

   C-FR  RFC 3034 defines a label-switching-controlled Frame Relay
   
         (LC-FR) interface.  Packets traversing such an interface carry
         labels in the DLCI field
   
   C-ATM RFC 3035 defines a label-switching-controlled ATM (LC-ATM)
         interface as an ATM interface controlled by the label switching
         control component.  When a packet traversing such an interface
         is received, it is treated as a labeled packet.  The packet's
         top label is inferred from either the contents of the Virtual
         Channel Identifier (VCI) field or the combined contents of the
         Virtual Path Identifier (VPI) and VCI fields.  Any two LDP
         peers that are connected via an LC-ATM interface will use LDP
         negotiations to determine which of these cases is applicable to
         that interface.  Static configuration of labels is also
         possible.

When LDP is used to distribute labels for use on label-controlled interfaces, label configuration information may be available in the MPLS-LDP-ATM-STD-MIB [RFC3815] when LC-ATM interfaces are used, or the MPLS-LDP-FRAME-RELAY-STD-MIB [RFC3815] when LC-FR interfaces are used.

3. The SNMP 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].

4. Interface Stacking of LC-ATM

Since LC-ATM interfaces [RFC2863] can carry labeled MPLS traffic, they too are considered MPLS subinterfaces with ifType = mpls(166). They differ slightly in their capability from a packet-oriented MPLS interface in that they may carry ATM- or Frame-Relay-encapsulated traffic. It is thus beneficial to identify them as such. To do this, two tables are defined that extend the MPLS-LSR-STD MIB's mplsInterfaceTable (see section 5 for LC-ATM or section 6 for LC-FR).

5. Structure of the MPLS-LC-ATM-STD-MIB Module

The MPLS-LC-ATM-STD-MIB module is structured simply as a table of entries that sparsely extend those found in the interfaces table. In particular, the entries in the mplsLcAtmStdInterfaceConfTable extend interfaces capable of supporting MPLS, as is defined in [RFC3813], to include entries that also support LC-ATM (and their unique attributes). Therefore, the module can be visualized as follows. Note that the ifTable comes from [RFC2863], the mplsInterfaceTable from [RFC3813], and the mplsLcAtmStdInterfaceConfTable from the MPLS-LC-ATM-STD-MIB module described below.

   ifTable mplsInterfaceTable mplsLcAtmStdInterfaceConfTable
   .1
   .2       .2
   .3
   .4       .4                .4
   .5

In the example shown above, five interfaces exist on the device in question. Of those interfaces, those with ifIndex = .2 and .4 are of ifType = mpls(166) indicating that they are capable of MPLS. Of those two, the entry with index .4 is capable of MPLS LC-ATM operations.

Note that the label partition model utilized by the authors of this document reflects widespread implementation and is seen by the MPLS working group as sufficiently flexible to meet the operational needs, even if it is more restrictive than [RFC3035] allows. To this end, we have limited the control and unlabeled VPI and VCI to single values. Note that mplsLcAtmStdUnlabTrafVci and mplsLcAtmStdCtrlVci MUST not be equal; nor should mplsLcAtmStdCtrlVpi or mplsLcAtmStdUnlabTrafVpi be equal.

6. Structure of the MPLS-LC-FR-STD-MIB Module

The MPLS-LC-FR-STD-MIB module is structured simply as a table of entries that sparsely extend those found in the interfaces table. In particular, the entries in the mplsLcFrStdInterfaceConfTable extend interfaces capable of supporting MPLS, as is defined in [RFC3813], to include entries that also support LC-Frame Relay (and their unique attributes). Therefore, the module can be visualized as follows. Note that the ifTable comes from [RFC2863], the mplsInterfaceTable from [RFC3813], and the mplsLcAtmStdInterfaceConfTable from the MPLS-LC-FR-STD-MIB module described below.

   ifTable mplsInterfaceTable mplsLcFrStdInterfaceConfTable
   .1
   .2      .2
   .3
   .4      .4                 .4
   .5

Note that even though the architecture as described in [RFC3034] calls for supporting mixed labeled and unlabeled traffic, this MIB does not support that, as this capability does not seem to be used operationally. Note that the DLCI ranges represented by mplsLcFrStdTrafficMinDlci to mplsLcFrStdTrafficMaxDlci and mplsLcFrStdCtrlMinDlci to mplsLcFrStdCtrlMaxDlci MUST not overlap.

7. MPLS Label-Controlled ATM MIB Definitions

   The following MIB module imports from [RFC2514], [RFC3811], and
   [RFC3813].
   
   MPLS-LC-ATM-STD-MIB DEFINITIONS ::= BEGIN
   IMPORTS
      MODULE-IDENTITY, OBJECT-TYPE
         FROM SNMPv2-SMI
      MODULE-COMPLIANCE, OBJECT-GROUP
         FROM SNMPv2-CONF
      RowStatus, StorageType, TruthValue
         FROM SNMPv2-TC
      AtmVpIdentifier
         FROM ATM-TC-MIB
      mplsStdMIB, MplsAtmVcIdentifier
         FROM MPLS-TC-STD-MIB
      mplsInterfaceIndex
         FROM MPLS-LSR-STD-MIB
      ;

mplsLcAtmStdMIB MODULE-IDENTITY

      LAST-UPDATED "200601120000Z"  -- 12 January 2006
      ORGANIZATION "Multiprotocol Label Switching (MPLS) Working Group"
      CONTACT-INFO
          "        Thomas D. Nadeau
           Postal: Cisco Systems, Inc.
                   250 Apollo Drive
                   Chelmsford, MA 01824
           Tel:    +1-978-244-3051
           Email:  tnadeau@cisco.com
      
                   Subrahmanya Hegde
           Postal: Cisco Systems, Inc.
                   225 East Tazman Drive
           Tel:    +1-408-525-6562
           Email:  subrah@cisco.com
           General comments should be sent to mpls@uu.net
          "
      DESCRIPTION
          "This MIB module contains managed object definitions for
           MPLS Label-Controlled ATM interfaces as defined in
           [RFC3035].

Copyright © The Internet Society (2006). This

version of this MIB module is part of RFC 4368; see

the RFC itself for full legal notices."

      -- Revision history.
      REVISION
           "200601120000Z"  -- 12 January 2006
      DESCRIPTION
          "Initial revision, published as part of RFC 4368."
      ::= { mplsStdMIB 9 }

-- Top level components of this MIB module.

   -- Tables, Scalars, Notifications, Conformance
   
   mplsLcAtmStdNotifications OBJECT IDENTIFIER ::= { mplsLcAtmStdMIB 0 }
   
   mplsLcAtmStdObjects       OBJECT IDENTIFIER ::= { mplsLcAtmStdMIB 1 }
   
   mplsLcAtmStdConformance   OBJECT IDENTIFIER ::= { mplsLcAtmStdMIB 2 }
   
   -- MPLS LC-ATM Interface Configuration Table.
   mplsLcAtmStdInterfaceConfTable  OBJECT-TYPE
      SYNTAX        SEQUENCE OF MplsLcAtmStdInterfaceConfEntry
      MAX-ACCESS    not-accessible
      STATUS        current
      DESCRIPTION
          "This table specifies per-interface MPLS LC-ATM
           capability and associated information.  In particular,
           this table sparsely extends the MPLS-LSR-STD-MIB's
           mplsInterfaceConfTable."
      ::= { mplsLcAtmStdObjects 1 }

mplsLcAtmStdInterfaceConfEntry OBJECT-TYPE

      SYNTAX        MplsLcAtmStdInterfaceConfEntry
      MAX-ACCESS    not-accessible
      STATUS        current
      DESCRIPTION
          "An entry in this table is created by an LSR for
           every interface capable of supporting MPLS LC-ATM.
           Each entry in this table will exist only if a
           corresponding entry in ifTable and mplsInterfaceConfTable
           exists.  If the associated entries in ifTable and
           mplsInterfaceConfTable are deleted, the corresponding
           entry in this table must also be deleted shortly
           thereafter."
      INDEX       { mplsInterfaceIndex }
         ::= { mplsLcAtmStdInterfaceConfTable 1 }

MplsLcAtmStdInterfaceConfEntry ::= SEQUENCE {

      mplsLcAtmStdCtrlVpi                 AtmVpIdentifier,
      mplsLcAtmStdCtrlVci                 MplsAtmVcIdentifier,
   
      mplsLcAtmStdUnlabTrafVpi            AtmVpIdentifier,
      mplsLcAtmStdUnlabTrafVci            MplsAtmVcIdentifier,
      mplsLcAtmStdVcMerge                 TruthValue,
      mplsLcAtmVcDirectlyConnected        TruthValue,
      mplsLcAtmLcAtmVPI                   AtmVpIdentifier,
      mplsLcAtmStdIfConfRowStatus         RowStatus,
      mplsLcAtmStdIfConfStorageType       StorageType
   }

mplsLcAtmStdCtrlVpi OBJECT-TYPE

      SYNTAX        AtmVpIdentifier
      MAX-ACCESS    read-create
      STATUS        current
      DESCRIPTION
          "This is the VPI value over which this
           LSR is willing to accept control traffic on
           this interface."
      ::= { mplsLcAtmStdInterfaceConfEntry 1 }

mplsLcAtmStdCtrlVci OBJECT-TYPE

      SYNTAX        MplsAtmVcIdentifier
      MAX-ACCESS    read-create
      STATUS        current
      DESCRIPTION
          "This is the VCI value over which this
           LSR is willing to accept control traffic
           on this interface."
      ::= { mplsLcAtmStdInterfaceConfEntry 2 }

mplsLcAtmStdUnlabTrafVpi OBJECT-TYPE

      SYNTAX        AtmVpIdentifier
      MAX-ACCESS    read-create
      STATUS        current
      DESCRIPTION
          "This is the VPI value over which this
           LSR is willing to accept unlabeled traffic
           on this interface."
      ::= { mplsLcAtmStdInterfaceConfEntry 3 }

mplsLcAtmStdUnlabTrafVci OBJECT-TYPE

      SYNTAX        MplsAtmVcIdentifier
      MAX-ACCESS    read-create
      STATUS        current
      DESCRIPTION
          "This is the VCI value over which this
           LSR is willing to accept unlabeled traffic
           on this interface."
      ::= { mplsLcAtmStdInterfaceConfEntry 4 }

mplsLcAtmStdVcMerge OBJECT-TYPE

      SYNTAX      TruthValue
      MAX-ACCESS  read-create
      STATUS      current
      DESCRIPTION
          "If set to true(1), indicates that this interface
           is capable of ATM VC merge; otherwise, it MUST
           be set to false(2)."
      DEFVAL     { false }
      ::= { mplsLcAtmStdInterfaceConfEntry 5 }

mplsLcAtmVcDirectlyConnected OBJECT-TYPE

      SYNTAX      TruthValue
      MAX-ACCESS  read-create
      STATUS      current
      DESCRIPTION
        "This value indicates whether an LC-ATM is directly
         or indirectly (by means of a VP) connected.  If set to
         true(1), indicates that this interface is directly
         connected LC-ATM; otherwise, it MUST be set to
         false(2).  Note that although it can be intimated
         from RFC 3057 that multiple VPs may be used,
         in practice only a single one is used, and therefore
         the authors of this MIB module have chosen to model
         it as such."
      DEFVAL     { true }
      ::= { mplsLcAtmStdInterfaceConfEntry 6 }

mplsLcAtmLcAtmVPI OBJECT-TYPE

      SYNTAX        AtmVpIdentifier
      MAX-ACCESS    read-create
      STATUS        current
      DESCRIPTION
        "This is the VPI value used for indirectly
         connected LC-ATM interfaces.  For these
         interfaces, the VPI field is not
         available to MPLS, and the label MUST be
         encoded entirely within the VCI field
         (see [RFC3035]).  If the interface is directly
         connected, this value MUST be set to zero."
      DEFVAL  { 0 }
      ::= { mplsLcAtmStdInterfaceConfEntry 7 }

mplsLcAtmStdIfConfRowStatus OBJECT-TYPE

      SYNTAX        RowStatus
      MAX-ACCESS    read-create
      STATUS        current
      DESCRIPTION
          "This object is used to create and
           delete entries in this table.  When configuring
           entries in this table, the corresponding
           ifEntry and mplsInterfaceConfEntry
           MUST exist beforehand.  If a manager attempts to
           create an entry for a corresponding
           mplsInterfaceConfEntry that does not support LC-ATM,
           the agent MUST return an inconsistentValue error.
           If this table is implemented read-only, then the
           agent must set this object to active(1) when this
           row is made active.  If this table is implemented
           writable, then an agent MUST not allow modification
           to its objects once this value is set to active(1),
           except to mplsLcAtmStdIfConfRowStatus and
           mplsLcAtmStdIfConfStorageType."
      ::= { mplsLcAtmStdInterfaceConfEntry 8 }

mplsLcAtmStdIfConfStorageType OBJECT-TYPE

      SYNTAX        StorageType
      MAX-ACCESS    read-create
      STATUS        current
      DESCRIPTION
          "The storage type for this conceptual row.
           Conceptual rows having the value 'permanent(4)'
           need not allow write-access to any columnar
           objects in the row."
      DEFVAL { nonVolatile }
      ::= { mplsLcAtmStdInterfaceConfEntry 9 }

-- End of mplsLcAtmStdInterfaceConfTable

-- Module compliance.

mplsLcAtmStdCompliances

      OBJECT IDENTIFIER ::= { mplsLcAtmStdConformance 1 }

mplsLcAtmStdGroups

      OBJECT IDENTIFIER ::= { mplsLcAtmStdConformance 2 }

-- Compliance requirement for full compliance

mplsLcAtmStdModuleFullCompliance MODULE-COMPLIANCE

STATUS current
DESCRIPTION

"Compliance statement for agents that provide

full support for MPLS-LC-ATM-STD-MIB. Such
devices can be monitored and also be configured using this MIB module."

MODULE -- this module

         MANDATORY-GROUPS {
            mplsLcAtmStdIfGroup
         }
         
         OBJECT       mplsLcAtmStdIfConfRowStatus
         SYNTAX       RowStatus { active(1), notInService(2) }
         WRITE-SYNTAX RowStatus { active(1), notInService(2),
                                  createAndGo(4), destroy(6)
                                }
         DESCRIPTION "Support for createAndWait and notReady is
                      not required."
      
      ::= { mplsLcAtmStdCompliances 1 }

-- Compliance requirement for read-only implementations.

mplsLcAtmStdModuleReadOnlyCompliance MODULE-COMPLIANCE

      STATUS current
      DESCRIPTION
          "Compliance requirement for implementations that only
           provide read-only support for MPLS-LC-ATM-STD-MIB.
           Such devices can be monitored but cannot be configured
           using this MIB module.
          "
      MODULE -- this module
         MANDATORY-GROUPS {
            mplsLcAtmStdIfGroup
         }
      
         -- mplsLcAtmStdInterfaceConfTable
      
         OBJECT      mplsLcAtmStdCtrlVpi
         MIN-ACCESS  read-only
         DESCRIPTION
             "Write access is not required."
      
         OBJECT      mplsLcAtmStdCtrlVci
         MIN-ACCESS  read-only
         DESCRIPTION
             "Write access is not required."
      
         OBJECT      mplsLcAtmStdUnlabTrafVpi
         MIN-ACCESS  read-only
         DESCRIPTION
             "Write access is not required."
      
         OBJECT      mplsLcAtmStdUnlabTrafVci
         MIN-ACCESS  read-only
         DESCRIPTION
             "Write access is not required."
      
         OBJECT      mplsLcAtmStdVcMerge
         MIN-ACCESS  read-only
         DESCRIPTION
             "Write access is not required."
      
         OBJECT      mplsLcAtmStdIfConfRowStatus
         SYNTAX       RowStatus { active(1) }
         MIN-ACCESS   read-only
         DESCRIPTION "Write access is not required."
      
         OBJECT      mplsLcAtmVcDirectlyConnected
         MIN-ACCESS  read-only
         DESCRIPTION
             "Write access is not required."
      
         OBJECT      mplsLcAtmLcAtmVPI
         MIN-ACCESS  read-only
         DESCRIPTION
             "Write access is not required."
      
         OBJECT      mplsLcAtmStdIfConfStorageType
         MIN-ACCESS  read-only
         DESCRIPTION
             "Write access is not required."
      ::= { mplsLcAtmStdCompliances 2 }

-- Units of conformance.

mplsLcAtmStdIfGroup OBJECT-GROUP

      OBJECTS {
                mplsLcAtmStdCtrlVpi,
                mplsLcAtmStdCtrlVci,
                mplsLcAtmStdUnlabTrafVpi,
                mplsLcAtmStdUnlabTrafVci,
                mplsLcAtmStdVcMerge,
                mplsLcAtmVcDirectlyConnected,
                mplsLcAtmLcAtmVPI,
                mplsLcAtmStdIfConfRowStatus,
                mplsLcAtmStdIfConfStorageType
       }
      STATUS  current
      DESCRIPTION
             "Collection of objects needed for MPLS LC-ATM
              interface configuration."
      ::= { mplsLcAtmStdGroups 1 }
   
   END

8. MPLS Label-Controlled Frame Relay MIB Definitions

   The following MIB module imports from [RFC2115], [RFC3811], and
   [RFC3813].
   
   MPLS-LC-FR-STD-MIB DEFINITIONS ::= BEGIN
   IMPORTS
      MODULE-IDENTITY, OBJECT-TYPE
         FROM SNMPv2-SMI
      MODULE-COMPLIANCE, OBJECT-GROUP
         FROM SNMPv2-CONF
      RowStatus, StorageType
         FROM SNMPv2-TC
      mplsInterfaceIndex
         FROM MPLS-LSR-STD-MIB
      DLCI
         FROM FRAME-RELAY-DTE-MIB
      mplsStdMIB
         FROM MPLS-TC-STD-MIB
      ;
   mplsLcFrStdMIB MODULE-IDENTITY
   
      LAST-UPDATED "200601120000Z"  -- 12 January 2006
      ORGANIZATION "Multiprotocol Label Switching (MPLS) Working Group"
      CONTACT-INFO
          "        Thomas D. Nadeau
                   Cisco Systems, Inc.
           Email:  tnadeau@cisco.com
   
                   Subrahmanya Hegde
           Email:  subrah@cisco.com
   
           General comments should be sent to mpls@uu.net
          "
      DESCRIPTION
          "This MIB module contains managed object definitions for
           MPLS Label-Controlled Frame-Relay interfaces as defined
           in (RFC3034).

Copyright © The Internet Society (2006). This

version of this MIB module is part of RFC 4368; see

the RFC itself for full legal notices."

      -- Revision history.
      REVISION
           "200601120000Z"  -- 12 January 2006
      DESCRIPTION
          "Initial revision, published as part of RFC 4368."
      ::= { mplsStdMIB 10 }
   
   -- Top level components of this MIB module.
   -- Tables, Scalars, Notifications, Conformance
   
   mplsLcFrStdNotifications OBJECT IDENTIFIER ::= { mplsLcFrStdMIB 0 }
   mplsLcFrStdObjects       OBJECT IDENTIFIER ::= { mplsLcFrStdMIB 1 }
   mplsLcFrStdConformance   OBJECT IDENTIFIER ::= { mplsLcFrStdMIB 2 }
   
   -- MPLS LC-FR Interface Configuration Table.
   mplsLcFrStdInterfaceConfTable  OBJECT-TYPE
      SYNTAX        SEQUENCE OF MplsLcFrStdInterfaceConfEntry
      MAX-ACCESS    not-accessible
      STATUS        current
      DESCRIPTION
          "This table specifies per-interface MPLS LC-FR
           capability and associated information.  In particular,
           this table sparsely extends the MPLS-LSR-STD-MIB's
           mplsInterfaceConfTable."
      ::= { mplsLcFrStdObjects 1 }

mplsLcFrStdInterfaceConfEntry OBJECT-TYPE

      SYNTAX        MplsLcFrStdInterfaceConfEntry
      MAX-ACCESS    not-accessible
      STATUS        current
      DESCRIPTION
          "An entry in this table is created by an LSR for
           every interface capable of supporting MPLS LC-FR.
           Each entry in this table will exist only if a
           corresponding entry in ifTable and mplsInterfaceConfTable
           exists.  If the associated entries in ifTable and
           mplsInterfaceConfTable are deleted, the corresponding
           entry in this table must also be deleted shortly
           thereafter."
      INDEX       { mplsInterfaceIndex }
         ::= { mplsLcFrStdInterfaceConfTable 1 }

MplsLcFrStdInterfaceConfEntry ::= SEQUENCE {

      mplsLcFrStdTrafficMinDlci           DLCI,
      mplsLcFrStdTrafficMaxDlci           DLCI,
      mplsLcFrStdCtrlMinDlci              DLCI,
      mplsLcFrStdCtrlMaxDlci              DLCI,
      mplsLcFrStdInterfaceConfRowStatus   RowStatus,
   
      mplsLcFrStdInterfaceConfStorageType StorageType
   }

mplsLcFrStdTrafficMinDlci OBJECT-TYPE

      SYNTAX        DLCI
      MAX-ACCESS    read-create
      STATUS        current
      DESCRIPTION
          "This is the minimum DLCI value over which this
           LSR is willing to accept traffic on this
           interface."
      ::= { mplsLcFrStdInterfaceConfEntry 1 }

mplsLcFrStdTrafficMaxDlci OBJECT-TYPE

      SYNTAX        DLCI
      MAX-ACCESS    read-create
      STATUS        current
      DESCRIPTION
          "This is the max DLCI value over which this
           LSR is willing to accept traffic on this
           interface."
      ::= { mplsLcFrStdInterfaceConfEntry 2 }

mplsLcFrStdCtrlMinDlci OBJECT-TYPE

      SYNTAX        DLCI
      MAX-ACCESS    read-create
      STATUS        current
      DESCRIPTION
          "This is the min DLCI value over which this
           LSR is willing to accept control traffic
           on this interface."
      ::= { mplsLcFrStdInterfaceConfEntry 3 }

mplsLcFrStdCtrlMaxDlci OBJECT-TYPE

      SYNTAX        DLCI
      MAX-ACCESS    read-create
      STATUS        current
      DESCRIPTION
          "This is the max DLCI value over which this
           LSR is willing to accept control traffic
           on this interface."
      ::= { mplsLcFrStdInterfaceConfEntry 4 }

mplsLcFrStdInterfaceConfRowStatus OBJECT-TYPE

      SYNTAX        RowStatus
      MAX-ACCESS    read-create
      STATUS        current
      DESCRIPTION
          "This object is used to create and
           delete entries in this table.  When configuring
           entries in this table, the corresponding ifEntry and
           mplsInterfaceConfEntry MUST exist beforehand.  If a manager
           attempts to create an entry for a corresponding
           mplsInterfaceConfEntry that does not support LC-FR,
           the agent MUST return an inconsistentValue error.
           If this table is implemented read-only, then the
           agent must set this object to active(1) when this
           row is made active.  If this table is implemented
           writable, then an agent MUST not allow modification
           to its objects once this value is set to active(1),
           except to mplsLcFrStdInterfaceConfRowStatus and
           mplsLcFrStdInterfaceConfStorageType."
      ::= { mplsLcFrStdInterfaceConfEntry 5 }

mplsLcFrStdInterfaceConfStorageType OBJECT-TYPE

      SYNTAX        StorageType
      MAX-ACCESS    read-create
      STATUS        current
      DESCRIPTION
          "The storage type for this conceptual row.
           Conceptual rows having the value 'permanent(4)'
           need not allow write-access to any columnar
           objects in the row."
      DEFVAL { nonVolatile }
      ::= { mplsLcFrStdInterfaceConfEntry 6 }

-- End of mplsLcFrStdInterfaceConfTable

-- Module compliance.

mplsLcFrStdCompliances

      OBJECT IDENTIFIER ::= { mplsLcFrStdConformance 1 }

mplsLcFrStdGroups

      OBJECT IDENTIFIER ::= { mplsLcFrStdConformance 2 }

-- Compliance requirement for full compliance

mplsLcFrStdModuleFullCompliance MODULE-COMPLIANCE

STATUS current
DESCRIPTION

"Compliance statement for agents that provide

full support for MPLS-LC-FR-STD-MIB. Such
devices can be monitored and also be configured using this MIB module."

MODULE -- this module

         MANDATORY-GROUPS {
            mplsLcFrStdIfGroup
         }
         
         OBJECT       mplsLcFrStdInterfaceConfRowStatus
         SYNTAX       RowStatus { active(1), notInService(2) }
         WRITE-SYNTAX RowStatus { active(1), notInService(2),
                                  createAndGo(4), destroy(6)
                                }
         DESCRIPTION "Support for createAndWait and notReady is
                      not required."
      
      ::= { mplsLcFrStdCompliances 1 }

-- Compliance requirement for read-only implementations.

mplsLcFrStdModuleReadOnlyCompliance MODULE-COMPLIANCE

STATUS current
DESCRIPTION

"Compliance requirement for implementations that only provide read-only support for MPLS-LC-FR-STD-MIB.
Such devices can be monitored but cannot be configured using this MIB module.
"

MODULE -- this module

         MANDATORY-GROUPS {
            mplsLcFrStdIfGroup
         }
         
         -- mplsLcFrStdInterfaceConfTable
         
         OBJECT     mplsLcFrStdTrafficMinDlci
         MIN-ACCESS  read-only
         DESCRIPTION
             "Write access is not required."
         
         OBJECT     mplsLcFrStdTrafficMaxDlci
         MIN-ACCESS  read-only
         DESCRIPTION
             "Write access is not required."
         
         OBJECT      mplsLcFrStdCtrlMinDlci
         MIN-ACCESS  read-only
         DESCRIPTION
             "Write access is not required."
         
         OBJECT      mplsLcFrStdCtrlMaxDlci
         MIN-ACCESS  read-only
         DESCRIPTION
             "Write access is not required."
         
         OBJECT       mplsLcFrStdInterfaceConfRowStatus
         SYNTAX       RowStatus { active(1) }
         MIN-ACCESS   read-only
         DESCRIPTION "Write access is not required."
      
         OBJECT      mplsLcFrStdInterfaceConfStorageType
         MIN-ACCESS  read-only
         DESCRIPTION
             "Write access is not required."
      ::= { mplsLcFrStdCompliances 2 }

-- Units of conformance.

mplsLcFrStdIfGroup OBJECT-GROUP

      OBJECTS {
           mplsLcFrStdTrafficMinDlci,
           mplsLcFrStdTrafficMaxDlci,
           mplsLcFrStdCtrlMinDlci,
           mplsLcFrStdCtrlMaxDlci,
           mplsLcFrStdInterfaceConfRowStatus,
           mplsLcFrStdInterfaceConfStorageType
       }
      STATUS  current
      
      DESCRIPTION
             "Collection of objects needed for MPLS LC-FR
              interface configuration."
      ::= { mplsLcFrStdGroups 1 }
   
   END

9. Acknowledgments

We wish to thank Joan Cucchiara and Carlos Pignataro for their comments on this document.

10. Security Considerations

It is clear that these MIB modules are potentially useful for monitoring MPLS LSRs supporting LC-ATM and/or LC-FR. These MIBs can also be used for configuration of certain objects, and anything that can be configured can be incorrectly configured, with potentially disastrous results.

There are a number of management objects defined in this MIB module with a MAX-ACCESS clause of read-write and/or read-create. Such objects may be considered sensitive or vulnerable in some network environments. The support for SET operations in a non-secure environment without proper protection can have a negative effect on network operations. These are the tables and objects and their sensitivity/vulnerability:

   o    the MplsLcAtmStdInterfaceConfTable and
        mplsLcFrStdInterfaceConfTable collectively contain objects that
        may be used to provision MPLS LC or FR-enabled interfaces.
        Unauthorized access to objects in these tables could result in
        disruption of traffic on the network.  This is especially true
        if traffic has been established over these interfaces.  The use
        of stronger mechanisms such as SNMPv3 security should be
        considered where possible.  Specifically, SNMPv3 VACM and USM
        MUST be used with any v3 agent that implements this MIB module.
        Administrators should consider whether read access to these
        objects should be allowed, since read access may be undesirable
        under certain circumstances.

Some of the readable objects in this MIB module (i.e., objects with a MAX-ACCESS other than not-accessible) may be considered sensitive or vulnerable in some network environments. It is thus important to control even GET and/or NOTIFY access to these objects and possibly to even encrypt the values of these objects when sending them over the network via SNMP. These are the tables and objects and their sensitivity/vulnerability:

   o    the MplsLcAtmStdInterfaceConfTable and
        mplsLcFrStdInterfaceConfTable collectively show the LC-ATM
        and/or LC-FR interfaces, their associated configurations, and
        their linkages to other MPLS-related configuration and/or
        performance statistics.  Administrators not wishing to reveal

this information should consider these objects sensitive/vulnerable and take precautions so they are not revealed.

SNMP versions prior to SNMPv3 did not include adequate security. Even if the network itself is secure (for example by using IPSec), even then, there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB module.

It is RECOMMENDED that implementers consider the security features as provided by the SNMPv3 framework (see [RFC3410], section 8), including full support for the SNMPv3 cryptographic mechanisms (for authentication and privacy).

Further, deployment of SNMP versions prior to SNMPv3 is NOT RECOMMENDED. Instead, it is RECOMMENDED to deploy SNMPv3 and to enable cryptographic security. It is then a customer/operator responsibility to ensure that the SNMP entity giving access to an instance of this MIB module, is properly configured to give access to the objects only to those principals (users) that have legitimate rights to indeed GET or SET (change/create/delete) them.

11. IANA Considerations

As described in and as requested in the MPLS-TC-STD-MIB [RFC3811], MPLS-related standards track MIB modules should be rooted under the mplsStdMIB subtree. There are 2 MPLS MIB modules contained in this document; each of the following "IANA Considerations" subsections requested from IANA a new assignment under the mplsStdMIB subtree. New assignments can only be made via a Standards Action as specified in [RFC2434].

11.1. IANA Considerations for MPLS-LC-ATM-STD-MIB

The IANA has assigned { mplsStdMIB 9 } to the MPLS-LC-ATM-STD-MIB module specified in this document.

11.2. IANA Considerations for MPLS-LC-FR-STD-MIB

The IANA has assigned { mplsStdMIB 10 } to the MPLS-LC-FR-STD-MIB module specified in this document.

12. References

12.1. Normative References

   [RFC3034]   Conta, A., Doolan, P., and A. Malis, "Use of Label
               Switching on Frame Relay Networks Specification", RFC
               3034, January 2001.
   
   [RFC3035]   Davie, B., Lawrence, J., McCloghrie, K., Rosen, E.,
               Swallow, G., Rekhter, Y., and P. Doolan, "MPLS using LDP
               and ATM VC Switching", RFC 3035, January 2001.
   
   [RFC2115]   Brown, C. and F. Baker, "Management Information Base for
               Frame Relay DTEs Using SMIv2", RFC 2115, September 1997.
   
   [RFC2514]   Noto, M., Spiegel, E., and K. Tesink, "Definitions of
               Textual Conventions and OBJECT-IDENTITIES for ATM
               Management", RFC 2514, February 1999.
   
   [RFC2863]   McCloghrie, K. and F. Kastenholz, "The Interfaces Group
               MIB", RFC 2863, June 2000.
   
   [RFC3031]   Rosen, E., Viswanathan, A., and R. Callon, "Multiprotocol
               Label Switching Architecture", RFC 3031, January 2001.
   
   [RFC3811]   Nadeau, T. and J. Cucchiara, "Definitions of Textual
               Conventions (TCs) 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
               Router (LSR) Management Information Base (MIB)", RFC
               3813, June 2004.
   
   [RFC2119]   Bradner, S., "Key words for use in RFCs to Indicate
               Requirement Levels", BCP 14, RFC 2119, March 1997.
   
   [RFC2578]   McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
               Rose, M., and S. Waldbusser, "Structure of Management
               Information Version 2 (SMIv2)", STD 58, RFC 2578, April
               1999.
   
   [RFC2579]   McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
               Rose, M., and S. Waldbusser, "Textual Conventions for
               SMIv2", STD 58, RFC 2579, April 1999.
   
   [RFC2580]   McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
               Rose, M., and S. Waldbusser, "Conformance Statements for
               SMIv2", STD 58, RFC 2580, April 1999.

12.2. Informative References

   [RFC2434]   Narten, T. and H. Alvestrand, "Guidelines for Writing an
               IANA Considerations Section in RFCs", BCP 26, RFC 2434,
               October 1998.
   
   [RFC3410]   Case, J., Mundy, R., Partain, D., and B. Stewart,
               "Introduction and Applicability Statements for Internet-
               Standard Management Framework", RFC 3410, December 2002.
   
   [RFC3815]   Cucchiara, J., Sjostrand, H., and J. Luciani,
               "Definitions of Managed Objects for the Multiprotocol
               Label Switching (MPLS), Label Distribution Protocol
               (LDP)", RFC 3815, June 2004.

Authors' Addresses

Thomas D. Nadeau
Cisco Systems, Inc.
300 Beaver Brook Road
Boxboro, MA 01719

   Phone: +1-978-936-1470
   EMail: tnadeau@cisco.com

Subrahmanya Hegde
Cisco Systems, Inc.
225 East Tazman Drive
San Jose, CA 95134

   Phone: +1-408-525-6562
   EMail: subrah@cisco.com

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Acknowledgement

Funding for the RFC Editor function is provided by the IETF Administrative Support Activity (IASA).

Multiprotocol Label Switching (MPLS) Label-Controlled

Asynchronous Transfer Mode (ATM) and Frame-Relay

Management Interface Definition

Status of This Memo

Copyright Notice

Abstract

Table of Contents

1. Introduction

2. Terminology

3. The SNMP Management Framework

4. Interface Stacking of LC-ATM

5. Structure of the MPLS-LC-ATM-STD-MIB Module

6. Structure of the MPLS-LC-FR-STD-MIB Module

7. MPLS Label-Controlled ATM MIB Definitions

Copyright © The Internet Society (2006). This

version of this MIB module is part of RFC 4368; see

the RFC itself for full legal notices."

8. MPLS Label-Controlled Frame Relay MIB Definitions

Copyright © The Internet Society (2006). This

version of this MIB module is part of RFC 4368; see

the RFC itself for full legal notices."

9. Acknowledgments

10. Security Considerations

11. IANA Considerations

11.1. IANA Considerations for MPLS-LC-ATM-STD-MIB

11.2. IANA Considerations for MPLS-LC-FR-STD-MIB

12. References

12.1. Normative References

12.2. Informative References

Authors' Addresses

Full Copyright Statement

Intellectual Property

Acknowledgement