Network Working Group
Request for Comments: 2955
Category: Standards Track
K. Rehbehn
Megisto Systems
O. Nicklass
RAD Data Communications, Ltd.
G. Mouradian
AT&T Labs
October 2000

Definitions of Managed Objects

for Monitoring and Controlling the

Frame Relay/ATM PVC Service Interworking Function

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

Copyright © The Internet Society (2000). All Rights Reserved.

Abstract

This memo defines a Management Information Base (MIB) to configure, monitor, and control a service interworking function (IWF) for Permanent Virtual Connections (PVC) between Frame Relay and Asynchronous Transfer Mode (ATM) technologies.

Table of Contents

   1. The SNMP Management Framework ...............................   2
   2. Conventions .................................................   3
   3. Overview ....................................................   3
   3.1 Frame Relay/ATM Service Interworking Background ............   4
   3.2 Structure of the MIB .......................................   4
   3.3 Relationship to Other MIBs .................................   5
   3.3.1 Frame Relay Service MIB ..................................   6
   3.3.2 Frame Relay DTE MIB ......................................   6
   3.3.3 ATM MIB ..................................................   6
   3.3.4 IF MIB ...................................................   7
   3.4 Point to Multipoint Considerations .........................   7
   3.5 Theory of Operation ........................................   7
   3.5.1 Creation Process .........................................   7
   3.5.2 Destruction Process ......................................  10
   
   3.5.3 Modification Process .....................................  11
   4. Object Definitions ..........................................  11
   4.1 The FR/ATM PVC Service IWF Connection Group ................  13
   4.2 The FR/ATM PVC Service IWF Connection Descriptor Group .....  21
   5. Augmentation of ATM MIB VCL Endpoint Entry (atmVclEntry) ....  27
   6. Frame Relay/ATM PVC Service Interworking NOTIFICATION .......  29
   7. Conformance Information .....................................  29
   7.1 Compliance Statement For Equipment .........................  29
   7.2 Compliance Statement For Service (CNM Interface) ...........  30
   7.3 Units of Conformance .......................................  32
   7.3.1 Basic FR/ATM IWF PVC Connection Group ....................  32
   7.3.2 FR/ATM IWF PVC Connection Descriptor Group ...............  32
   7.3.3 ATM MIB VCL Endpoint Table Augmentation ..................  33
   7.3.4 Notification Group .......................................  33
   8. Acknowledgments .............................................  34
   9. References ..................................................  34
   10. Security Considerations ....................................  36
   11. Authors' Addresses .........................................  37
   12. Intellectual Property Rights ...............................  38
   13. Full Copyright Statement ...................................  39

1. The SNMP Management Framework

The SNMP Management Framework presently consists of five major components:

  • An overall architecture, described in RFC 2571 [1].
  • Mechanisms for describing and naming objects and events for the purpose of management. The first version of this Structure of Management Information (SMI) is called SMIv1 and described in STD 16, RFC 1155 [2], STD 16, RFC 1212 [3] and RFC 1215 [4]. The second version, called SMIv2, is described in STD 58, RFC 2578 [5], STD 58, RFC 2579 [6] and STD 58, RFC 2580 [7].
  • Message protocols for transferring management information. The first version of the SNMP message protocol is called SNMPv1 and described in STD 15, RFC 1157 [8]. A second version of the SNMP message protocol, which is not an Internet standards track protocol, is called SNMPv2c and described in RFC 1901 [9] and RFC 1906 [10]. The third version of the message protocol is called SNMPv3 and described in RFC 1906 [10], RFC 2572 [11] and RFC 2574 [12].
  • Protocol operations for accessing management information. The first set of protocol operations and associated PDU formats is described in STD 15, RFC 1157 [8]. A second set of protocol operations and associated PDU formats is described in RFC 1905 [13].
  • A set of fundamental applications described in RFC 2573 [14] and the view-based access control mechanism described in RFC 2575 [15].

A more detailed introduction to the current SNMP Management Framework can be found in RFC 2570 [16].

Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. Objects in the MIB are defined using the mechanisms defined in the SMI.

This memo specifies a MIB module that is compliant to the SMIv2. A MIB conforming to the SMIv1 can be produced through the appropriate translations. The resulting translated MIB must be semantically equivalent, except where objects or events are omitted because no translation is possible (use of Counter64). Some machine readable information in SMIv2 will be converted into textual descriptions in SMIv1 during the translation process. However, this loss of machine readable information is not considered to change the semantics of the MIB.

2. Conventions

The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD, SHOULD NOT, RECOMMENDED, NOT RECOMMENDED, MAY, and OPTIONAL, when they appear in this document, are to be interpreted as described in RFC 2119 [23].

3. Overview

This document defines a Management Information Base (MIB) for monitoring and controlling a service interworking function (IWF) for Permanent Virtual Connections (PVC) between Frame Relay and Asynchronous Transfer Mode (ATM) technologies. The agreements on which this MIB is based were reached jointly by the Frame Relay Forum and the ATM Forum and are documented in the Frame Relay Forum Document FRF.8 [17].

3.1. Frame Relay/ATM Service Interworking Background

Frame relay to ATM interworking is a function that exchanges Protocol Data Units (PDU) between a frame relay service user and an ATM service user. Two types of interworking functions are specified for frame relay and ATM permanent virtual connection (PVC) service users: network interworking and service interworking.

Network interworking provides PDU forwarding between frame relay service users inter-connected by an ATM service. Both endpoints are frame relay PVCs. Frame Relay to ATM PVC Network Interworking is defined in [20].

Service interworking provides PDU forwarding so that the ATM service user performs no frame relaying service-specific functions and the frame relay service user performs no ATM service-specific functions. Optionally, the service IWF translates particular higher layer protocols to satisfy the requirements of end-systems. Frame Relay to ATM PVC Service Interworking is defined in [17].

This MIB describes management objects used to provision, monitor, and control a Frame Relay/ATM PVC Service IWF.

FRF.8 [17] does not address point-to-multipoint applications of the IWF. Implementations MAY provide support for point-to-multipoint capability using this MIB.

Consult FRF.8 [17] for more details on the operation of a Frame Relay/ATM PVC Service IWF.

3.2. Structure of the MIB

The Frame Relay/ATM PVC Service IWF managed objects are organized as follows:

(1) FR/ATM PVC Service IWF cross-connect table,

   (2) Connection description table, and
   
   (3) Notification object

The IWF cross-connect table contains one or more rows for each inter-worked connection. Each inter-worked connection is uniquely identified by the frAtmIwfConnIndex object. In the case of point-to- point, a single row is present. In the case of point-to-multipoint, one row exists for each multipoint destination. Index objects for the ATM port, VPI, VCI, frame relay port, and frame relay DLCI distinguish the constituent rows used in a point-to-multipoint case.

Each inter-worked connection has attributes governing behavior of the IWF. These attributes describe how the IWF should transform a PDU during the forwarding process and provide rules for:

(1) Mapping the ATM CLP bit to frame relay DE bit

(2) Mapping the ATM congestion notification bit to frame relay

       congestion bits

(3) Mapping higher protocol encapsulations between ATM and frame

       relay

(4) Performing fragmentation and reassembly

(5) Performing ARP translation between ATM and frame relay

Typically, most connections share the same attributes. The attributes are represented in this MIB by the connection description table. Each row of the connection description table contains the attribute settings common to one or more inter-worked connections. One example would be full mapping and translation. All cross-connect table entries that require full mapping and translation services set the frAtmIwfConnectionDescriptor object to the index value for the connection description table row that contains objects set to values that provide full mapping and translation services.

A notification object provides cross-connect status change alerts.

3.3. Relationship to Other MIBs

The Frame Relay/ATM PVC Service IWF MIB describes the cross- connections between frame relay and ATM service users. Each PVC endpoint is provisioned and managed with a technology-specific MIB as described below.

Each technology-specific MIB has a table of PVC endpoints (indexed by ifIndex and logical link address such as the DLCI or VPI/VCI). In the absence of interworking, two endpoints are cross-connected via a technology-specific cross connect table (e.g., the atmVcCrossConnectTable in the ATM MIB). However, a connection between a frame relay endpoint and an ATM endpoint requires a cross- connect in the ATM IWF MIB.

The following sections describe the relationship between the technology-specific MIBs and the FR/ATM PVC Service IWF MIB.

3.3.1. Frame Relay Service MIB

Frame relay PVC endpoints are provisioned as rows in the Frame Relay Services MIB [19] endpoint table.

Each frame relay PVC endpoint is described in the frPVCEndptTable. A connection between two frame relay endpoints is described by an entry in the frame relay PVC cross-connect table frPVCConnectTable. The frPVCEndptConnectIdentifier object of each endpoint points to the frPVCConnectTable cross-connect table row for the connection.

In the case of an inter-worked connection, the frPVCEndptConnectIdentifier object is set to zero. Instead, the frPVCEndptAtmIwfConnIndex object is set to the index of the FR/ATM IWF cross-connect table row.

The frame relay PVC cross-connect table (frPVCConnectTable) does not contain an entry for the FR/ATM inter-worked connection.

Note that the frPVCEndptConnectIdentifier and frPVCEndptAtmIwfConnIndex objects are set by the system as a side- effect of cross-connect establishment. Consequently, these objects are read-only.

3.3.2. Frame Relay DTE MIB

The Frame Relay DTE MIB described in [24] has no relevance to the FR/ATM PVC Service IWF MIB.

3.3.3. ATM MIB

ATM PVC endpoints are provisioned as rows in the ATM MIB [21] virtual connection link table.

Each ATM connection endpoint is described in the atmVclTable. A connection between two ATM endpoints is described by an entry in the ATM VCL cross-connect table atmVcCrossConnectTable. The atmVclCrossConnectIdentifier object of each endpoint points to the atmVcCrossConnectTable row for the connection.

In the case of an inter-worked connection, the atmVclCrossConnectIdentifier object is set to zero. Instead, the frAtmIwfVclCrossConnectIdentifier object in the frAtmIwfVclEntry is set to the index of the applicable FR/ATM IWF cross-connect table row.

Note that the frAtmIwfVclCrossConnectIdentifier object is defined not in the ATM MIB but in Section 5 of this MIB. Specifically, the object is defined as a column object in a table that AUGMENTs the ATM MIB VCL table.

The ATM VCL cross-connect table (atmVcCrossConnectTable) does not contain an entry for the inter-worked connection.

Note that the atmVclCrossConnectIdentifier and frAtmIwfVclCrossConnectIdentifier objects are set by the system as a side-effect of cross-connect establishment. Consequently, these objects are read-only.

3.3.4. IF MIB

The ifIndex defined in the IF MIB [22] identifies the specific frame relay and ATM endpoint interfaces. The values frAtmIwfConnAtmPort and frAtmIwfConnFrPort are used in this MIB as components in the index list for the frAtmIwfConnectionTable rows.

3.4. Point to Multipoint Considerations

This MIB supports IWF implementations providing point-to-multipoint functionality. All rows of the cross-connect table indexed by the same frAtmIwfConnIndex MUST utilize the same frAtmIwfConnectionDescriptor value.

A group of cross-connect table entries indexed by the same frAtmIwfConnIndex value MUST agree on which service the multipoint operation is offered. Two cases are possible:

(1) Many frame relay PVCs cross-connected to one ATM PVC, or

(2) One frame relay PVC cross-connected to many ATM PVCs

3.5. Theory of Operation

3.5.1. Creation Process

Multiple steps are required to create a frame relay to ATM cross- connection. First, rows must be created in the following tables:

(1) The Frame Relay Service MIB frPVCEndptTable

(2) The ATM MIB atmVclTable

(3) The FR/ATM Service IWF MIB frAtmIwfConnectionDescriptorTable

(4) The FR/ATM Service IWF MIB frAtmIwfConnectionTable

Second, the newly created rows are cross-linked.

Finally, the administrative and operational status objects are set to 'up(1)'.

A step-by-step example is provided to illustrate the creation process. In this example, the term "Manager" refers to a network management system that issues SNMP protocol actions to an "Agent". The agent is integrated with the system that implements the frame relay to ATM service IWF. In this example, the following cross- connection is created:

                  +-----------------------------------+
   +---------+    |       FR/ATM PVC Service IWF      |
   | Frame   |    |   ------------------------------  |    +-----------+
   | Relay   |  +--------> frAtmIwfConnIndex K <--------+  |   ATM     |
   |Endpoint |  | |               V                   | |  | Endpoint  |
   | ------- |  | |               |                   | |  | --------- |
   | DLCI X  |  | |  +------------+                   | |  |VPI.VCI Q.R|
   |  on     |<-+ |  |                                | +->|    on     |
   |ifIndex Y|    |  V                                |    | ifIndex S |
   +---------+    |frAtmIwfConnectionDescriptorIndex L|    +-----------+
                  +-----------------------------------+

Step 1 - Create the frame relay PVC endpoint

a) Manager requests creation of a new row in the frPVCEndptTable

b) Agent receives management request to create a row in

frPVCEndptTable for the frame relay side

c) A new row is created in frPVCEndptTable as follows:

  • frPVCEndptConnectIdentifier initialized to zero
  • frPVCEndptAtmIwfConnIndex initialized to zero
  • remaining row objects initialized as needed for DLCI X on ifIndex Y

Step 2 - Create the ATM PVC endpoint

a) Agent receives management request to create a row in atmVclTable

for the ATM side

b) A new row is created in atmVclTable and frAtmIwfVclTable (the

AUGMENT to the atmVclTable) as follows:

  • atmVclCrossConnectIdentifier initialized to zero
  • frAtmIwfVclCrossConnectIdentifier initialized to zero
      -  atmVclConnKind initialized to pvc(1)
  • remaining row objects initialized as needed for VPI.VCI Q.R on ifIndex S

Step 3 - Create the FR/ATM connection descriptor

a) If an existing connection descriptor is appropriate for the new

connection, go to Step 4 using the selected connection descriptor index value L

b) Manager requests a new connection descriptor index value by

reading frAtmIwfConnectionDescriptorIndexNext from the agent

c) Agent receives GET request for

frAtmIwfConnectionDescriptorIndexNext and responds with the next available value L

d) Manager requests a new connection descriptor row entry using the

value L as the index

e) Agent receives SET request to create the

frAtmIwfConnectionDescriptorTable row entry causes the system to create a row in the table.

   Step 4 - Create the FR/ATM cross-connect

a) Manager requests a new cross-connect index value by reading

frAtmIwfConnIndexNext from the agent

b) Agent receives GET request for frAtmIwfConnIndexNext and responds

with the next available value K

c) Manager requests a new cross-connect row entry using the value K

      as the index

d) Agent receives SET request to create the frAtmIwfConnectionTable

row entry (note: the frame relay and ATM PVC endpoints MUST exist and be specified as part of the index fields for the row 'K.S.Q.R.Y.X')

e) System creates a row in frAtmIwfConnectionTable for the following

indices:

  • frAtmIwfConnIndex of K
  • frAtmIwfConnAtmPort of S
  • frAtmIwfConnVpi of Q
  • frAtmIwfConnVci of R
  • frAtmIwfConnFrPort of Y
  • frAtmIwfConnDlci of X
  • frAtmIwfConnectionDescriptor of L

Step 5 - The system sets the frame relay PVC endpoint and ATM VCL endpoint to point to the FR/ATM cross-connect row (as a side-effect of Step 4).

a) System sets frPVCEndptAtmIwfConnIndex to K

b) System sets frAtmIwfVclCrossConnectIdentifier to K

Step 6 - Manager signals activation by issuing a SET for the frAtmIwfConnAdminStatus object using the value of 'up(1)'

Step 7 - Agent receives SET request for frAtmIwfConnAdminStatus and executes internal system mechanisms to activate each PVC segment and the IWF cross-connect. The successful activation permits the agent to respond with 'up(1)' when a GET request is received for the following fields:

  • frAtmIwfConnAtm2FrOperStatus
  • frAtmIwfConnFr2AtmOperStatus
  • atmVclOperStatus (Note: there is no comparable FRS MIB object)

3.5.2. Destruction Process

Destruction of the frame relay to ATM cross-connection is initiated by the network management system. The agent's processing of the request stimulates implementation-specific system clean-up actions. Following removal of the row in the cross-connection table, the frAtmIwfVclCrossConnectIdentifier in the frAtmIwfVclTable (AUGMENT of the ATM MIB endpoint table) and frPVCEndptAtmIwfConnIndex in the Frame Relay Service MIB endpoint table are both re-initialized to zero.

A step-by-step example is provided to illustrate the destruction process.

Step 1 - Manager requests destruction of an existing row in the frAtmIwfConnectionTable by setting frAtmIwfConnRowStatus to destroy(6)

Step 2 - Agent receives the SET request and performs implementation- specific system clean-up actions for the cross-connection row

Step 3 - System updates the relevant cross connect information for the frame relay PVC endpoint by setting frPVCEndptAtmIwfConnIndex to 0

Step 4 - System updates the relevant cross connect information for the ATM PVC endpoint as follows:

a) System sets frAtmIwfVclCrossConnectIdentifier to 0

b) System sets atmVclOperStatus to 'down(2)' (Note: there is no

comparable FRS MIB object)

Following the destruction of the FR/ATM cross-connection entry, the manager MAY set the frPVCConnectRowStatus and/or atmVclRowStatus to destroy(6) the associated endpoint entries.

3.5.3. Modification Process

At the discretion of the agent, a FR/ATM cross-connect may be reconfigured by adding and/or deleting leafs to/from the IWF topology as per the FR/ATM IWF cross-connect creation/destruction procedures. Reconfiguration of traffic/service category parameter values requires release of the FR/ATM IWF cross-connect before those parameter values may be changed for individual frame relay or ATM endpoint segments.

4. Object Definitions

FR-ATM-PVC-SERVICE-IWF-MIB DEFINITIONS ::= BEGIN

IMPORTS

              MODULE-IDENTITY, OBJECT-TYPE,
              NOTIFICATION-TYPE,
              mib-2, Integer32, Counter32             FROM SNMPv2-SMI
              RowStatus, TimeStamp                    FROM SNMPv2-TC
              
              MODULE-COMPLIANCE, OBJECT-GROUP,
              NOTIFICATION-GROUP                      FROM SNMPv2-CONF
              
              AtmVpIdentifier, AtmVcIdentifier        FROM ATM-TC-MIB
              
              atmVclEntry                             FROM ATM-MIB
              
              InterfaceIndex                          FROM IF-MIB;

frAtmIwfMIB MODULE-IDENTITY

             LAST-UPDATED "200009280000Z" -- September 28, 2000
             ORGANIZATION "IETF Frame Relay Service MIB Working Group"
             CONTACT-INFO
                 "WG Charter:
                    http://www.ietf.org/html.charters/frnetmib-charter
                  WG-email:
                    frnetmib@sunroof.eng.sun.com
                  Subscribe:
                    frnetmib-request@sunroof.eng.sun.com
                  Email Archive:
                    ftp://ftp.ietf.org/ietf-mail-archive/frnetmib
             
                  Chair:      Andy Malis
                              Vivace Networks, Inc.
                  Email:      Andy.Malis@vivacenetworks.com
             
                  WG editor:  Kenneth Rehbehn
                              Megisto Systems, Inc.
                  Email:      krehbehn@megisto.com
             
                  Co-author:  Orly Nicklass
                              RAD Data Communications Ltd.
                  EMail:      orly_n@rad.co.il
             
                  Co-author:  George Mouradian
                              AT&T Labs
                  EMail:      gvm@att.com"

DESCRIPTION

"The MIB module for monitoring and controlling the Frame Relay/ATM PVC Service Interworking Function."

             --
             -- Revision History
             --

REVISION "200009280000Z"
DESCRIPTION

"Published as RFC 2955"

         ::= { mib-2 86 }
         
         --
         -- Object Identifiers
         --
            frAtmIwfMIBObjects      OBJECT IDENTIFIER
                                         ::= { frAtmIwfMIB 1 }
         
            frAtmIwfTraps           OBJECT IDENTIFIER
                                         ::= { frAtmIwfMIB 2 }
            frAtmIwfTrapsPrefix     OBJECT IDENTIFIER
                                         ::= { frAtmIwfTraps 0 }
         
            frAtmIwfConformance     OBJECT IDENTIFIER
                                         ::= { frAtmIwfMIB 3 }
            frAtmIwfGroups          OBJECT IDENTIFIER
                                         ::= { frAtmIwfConformance 1 }
            frAtmIwfCompliances     OBJECT IDENTIFIER
                                         ::= { frAtmIwfConformance 2 }
         
         --
         --  The FR/ATM PVC Service IWF Group
         --
         --      The Frame Relay/ATM PVC Service Interworking Function
         --      Connection Table contains all connections utilizing
         --      the interworking function.
         --

frAtmIwfConnIndexNext OBJECT-TYPE

              SYNTAX         Integer32 (0..2147483647)
              MAX-ACCESS     read-only
              STATUS         current
              DESCRIPTION
                     "This object contains an appropriate value to be
                     used for frAtmIwfConnIndex  when creating entries
                     in the frAtmIwfConnectionTable. The value 0
                     indicates that no unassigned entries are
                     available. To obtain the frAtmIwfConnIndexNext
                     value for a new entry, the manager issues a
                     management protocol retrieval operation to obtain
                     the current value of this object.  After each
                     retrieval, the agent should modify the value to
                     the next unassigned index."
              ::= { frAtmIwfMIBObjects 1 }

frAtmIwfConnectionTable OBJECT-TYPE

             SYNTAX      SEQUENCE OF FrAtmIwfConnectionEntry
             MAX-ACCESS  not-accessible
             STATUS      current
             DESCRIPTION
                     "A table in which each row represents a Frame
                     Relay/ATM interworking connection."
             ::= { frAtmIwfMIBObjects 2 }

frAtmIwfConnectionEntry OBJECT-TYPE

             SYNTAX      FrAtmIwfConnectionEntry
             MAX-ACCESS  not-accessible
             STATUS      current
             DESCRIPTION
                     "The FrAtmIwfConnectionEntry provides an entry for
                     an interworking connection between a frame relay
                     PVC and one or more ATM PVCs, or an ATM PVC and
                     one or more frame relay PVCs.  A single frame
                     relay PVC connected to a single ATM PVC is
                     referred to as a `point-to-point' connection and
                     is represented by a single row in the FR/ATM IWF
                     Connection Table.  The case of a single frame
                     relay PVC connected to multiple ATM PVCs (or
                     single ATM PVC connected to multiple frame relay
                     PVCs) is referred to as a `point-to-multipoint'
                     connection and is represented by multiple rows in
                     the FR/ATM IWF Connection Table.

The object frAtmIwfConnIndex uniquely identifies each point-to-point or point-to-multipoint connection. The manager obtains the frAtmIwfConnIndex value by reading the frAtmIwfConnIndexNext object.

After a frAtmIwfConnIndex is assigned for the connection, the manager creates one or more rows in the Cross Connect Table; one for each cross- connection between the frame relay PVC and an ATM PVC. In the case of `point-to-multipoint' connections, all rows are indexed by the same frAtmIwfConnIndex value and MUST refer to the same frame relay PVC or ATM PVC respectively. An entry can be created only when at least one pair of frame relay and ATM PVCs exist.

A row can be established by one-step set-request with all required parameter values and frAtmIwfConnRowStatus set to createAndGo(4). The

                     Agent should perform all error checking as needed.
                     A pair of cross-connected PVCs, as identified by a
                     particular value of the indexes, is released by
                     setting frAtmIwfConnRowStatus to destroy(6). The
                     Agent may release all associated resources. The
                     manager may remove the related PVCs thereafter.
                     Indexes are persistent across reboots of the
                     system."
             INDEX   { frAtmIwfConnIndex,
                       frAtmIwfConnAtmPort,
                       frAtmIwfConnVpi,
                       frAtmIwfConnVci,
                       frAtmIwfConnFrPort,
                       frAtmIwfConnDlci
                     }
             ::= { frAtmIwfConnectionTable 1 }
         
         FrAtmIwfConnectionEntry ::=
             SEQUENCE {
                 frAtmIwfConnIndex                      Integer32,
                 frAtmIwfConnAtmPort                    InterfaceIndex,
                 frAtmIwfConnVpi                        AtmVpIdentifier,
                 frAtmIwfConnVci                        AtmVcIdentifier,
                 frAtmIwfConnFrPort                     InterfaceIndex,
                 frAtmIwfConnDlci                       Integer32,
                 frAtmIwfConnRowStatus                  RowStatus,
                 frAtmIwfConnAdminStatus                INTEGER,
                 frAtmIwfConnAtm2FrOperStatus           INTEGER,
                 frAtmIwfConnAtm2FrLastChange           TimeStamp,
                 frAtmIwfConnFr2AtmOperStatus           INTEGER,
                 frAtmIwfConnFr2AtmLastChange           TimeStamp,
                 frAtmIwfConnectionDescriptor           Integer32,
                 frAtmIwfConnFailedFrameTranslate       Counter32,
                 frAtmIwfConnOverSizedFrames            Counter32,
                 frAtmIwfConnFailedAal5PduTranslate     Counter32,
                 frAtmIwfConnOverSizedSDUs              Counter32,
                 frAtmIwfConnCrcErrors                  Counter32,
                 frAtmIwfConnSarTimeOuts                Counter32
         }
         
         frAtmIwfConnIndex  OBJECT-TYPE
             SYNTAX      Integer32  (1..2147483647)
             MAX-ACCESS  not-accessible
             STATUS      current
             DESCRIPTION
                     "A unique value for each point-to-point or point-
                     to-multipoint connection.  The manager obtains the
                     frAtmIwfConnIndex value by reading the
                     frAtmIwfConnIndexNext object.  A point-to-
                     multipoint connection will be represented in the
                     frAtmIwfConnectionTable with multiple entries that
                     share the same frAtmIwfConnIndex value."
             ::= { frAtmIwfConnectionEntry 1 }

frAtmIwfConnAtmPort OBJECT-TYPE

             SYNTAX      InterfaceIndex
             MAX-ACCESS  not-accessible
             STATUS      current
             DESCRIPTION
                     "The index in the ifTable that identifies the ATM
                     port for this interworking connection."
             ::= { frAtmIwfConnectionEntry 2 }

frAtmIwfConnVpi OBJECT-TYPE

             SYNTAX      AtmVpIdentifier
             MAX-ACCESS  not-accessible
             STATUS      current
             DESCRIPTION
                     "The VPI of the ATM PVC end point for this
                      interworking connection."
             ::= { frAtmIwfConnectionEntry 3 }

frAtmIwfConnVci OBJECT-TYPE

             SYNTAX      AtmVcIdentifier
             MAX-ACCESS  not-accessible
             STATUS      current
             DESCRIPTION
                     "The VCI of the ATM PVC end point for this
                     interworking
                      connection."
             ::= { frAtmIwfConnectionEntry 4 }

frAtmIwfConnFrPort OBJECT-TYPE

             SYNTAX      InterfaceIndex
             MAX-ACCESS  not-accessible
             STATUS      current
             DESCRIPTION
                     "The index in the ifTable that identifies the
                     frame relay port for this interworking
                     connection."
             ::= { frAtmIwfConnectionEntry 5 }

frAtmIwfConnDlci OBJECT-TYPE

             SYNTAX      Integer32 (16..4194303)
             MAX-ACCESS  not-accessible
             STATUS      current
             DESCRIPTION
                     "The DLCI that identifies the frame relay PVC end
                     point for this interworking connection."
             ::= { frAtmIwfConnectionEntry 6 }

frAtmIwfConnRowStatus OBJECT-TYPE

             SYNTAX      RowStatus
             MAX-ACCESS  read-create
             STATUS      current
             DESCRIPTION
                     "The table row may be created with
                     'createAndWait(5)' or 'createAndGo(4)'.
                     To activate a connection entry, a valid connection
                     descriptor MUST be established in the
                     frAtmIwfConnectionDescriptor object.
             
                     This object is set to 'destroy(6)' to delete the
                     table row.  Before the table row is destroyed, the
                     OperStatus/AdminStatus of the corresponding
                     endpoints MUST be 'down(2)'.  The deactivation of
                     the ATM endpoint MAY occur as a side-effect of
                     deleting the FR/ATM IWF cross-connection table
                     row.  Otherwise, 'destroy(6)' operation MUST fail
                     (error code 'inconsistentValue')."
             ::= { frAtmIwfConnectionEntry 7 }

frAtmIwfConnAdminStatus OBJECT-TYPE

             SYNTAX      INTEGER { up(1), down(2) }
             MAX-ACCESS  read-create
             STATUS      current
             DESCRIPTION
                     "The desired operational state for this FR/ATM
                     interworked connection.
             
                     up(1)       = Activate the connection. Before the
                                   activation can be completed, the
                                   OperStatus/AdminStatus of the
                                   corresponding endpoints MUST be
                                   'up(1)'.  The activation of the
                                   corresponding endpoints MAY occur as
                                   a side-effect of activating the
                                   FR/ATM IWF cross-connection.
             
                     down(2)     = Deactivate the connection. Before
                                   the deactivation can be completed,
                                   the atmVclAdminStatus of the
                                   corresponding ATM endpoint MUST be
                                   'down(2)'.  The deactivation of the
             
                                   ATM endpoint MAY occur as a
                                   side-effect of deactivating the
                                   FR/ATM IWF cross-connection."
             ::= { frAtmIwfConnectionEntry 8 }
         
         frAtmIwfConnAtm2FrOperStatus     OBJECT-TYPE
             SYNTAX      INTEGER { up(1), down(2) }
             MAX-ACCESS  read-only
             STATUS      current
             DESCRIPTION
                     "The current operational state of this
                     interworking connection in the ATM to frame
                     relay direction."
             ::= { frAtmIwfConnectionEntry 9 }
         
         frAtmIwfConnAtm2FrLastChange  OBJECT-TYPE
             SYNTAX      TimeStamp
             MAX-ACCESS  read-only
             STATUS      current
             DESCRIPTION
                     "The value of sysUpTime at the time this
                     interworking connection entered its current
                     operational state in the ATM to FR direction.  If
                     the current state was entered prior to the last
                     re-initialization of the local network management
                     subsystem, then this object contains a zero
                     value."
             ::= { frAtmIwfConnectionEntry 10 }
         
         frAtmIwfConnFr2AtmOperStatus     OBJECT-TYPE
             SYNTAX      INTEGER { up(1), down(2) }
             MAX-ACCESS  read-only
             STATUS      current
             DESCRIPTION
                     "The current operational state of this
                     interworking connection in the frame relay
                     to ATM direction."
             ::= { frAtmIwfConnectionEntry 11 }
         
         frAtmIwfConnFr2AtmLastChange  OBJECT-TYPE
             SYNTAX      TimeStamp
             MAX-ACCESS  read-only
             STATUS      current
             DESCRIPTION
                     "The value of sysUpTime at the time this
                     interworking connection entered its current
                     operational state in the FR to ATM direction.  If
                     the current state was entered prior to the last
                     re-initialization of the local network management
                     subsystem, then this object contains a zero
                     value."
             ::= { frAtmIwfConnectionEntry 12 }
         
         frAtmIwfConnectionDescriptor  OBJECT-TYPE
             SYNTAX      Integer32
             MAX-ACCESS  read-create
             STATUS      current
             DESCRIPTION
                     "The value represents a pointer to the relevant
                     descriptor in the IWF descriptor table.  An
                     attempt to set this value to an inactive or non-
                     existent row in the Connection Descriptor Table
                     MUST fail (error code 'inconsistentValue')."
             ::= { frAtmIwfConnectionEntry 13 }

frAtmIwfConnFailedFrameTranslate OBJECT-TYPE

             SYNTAX      Counter32
             UNITS       "Frames"
             MAX-ACCESS  read-only
             STATUS      current
             DESCRIPTION
                     "This object counts the number of frames discarded
                     by the IWF because, while operating in Translation
                     Mode, the IWF is unable to decode the incoming
                     frame payload header according to the mapping
                     rules. (i.e., payload header not recognized by the
                     IWF).

Frame relay frames are received in the frame relay to ATM direction of the PVC.

When operating in Transparent Mode, the IWF MUST return noSuchInstance."

                       REFERENCE
                                "FRF.8 [17], Section 5.3.1"
                       ::= { frAtmIwfConnectionEntry 14 }

frAtmIwfConnOverSizedFrames OBJECT-TYPE

             SYNTAX      Counter32
             UNITS       "Frames"
             MAX-ACCESS  read-only
             STATUS      current
             DESCRIPTION
                     "Count of frames discarded by the IWF because the
                     frame is too large to be processed by the AAL5
                     segmentation procedure.  Specifically, the frame

does not conform to the size specified in the atmVccAal5CpcsTransmitSduSize object associated with the atmVclEntry at the ATM endpoint. Frame relay frames are received in the frame relay to ATM direction of the PVC."

                       REFERENCE
                                "ATM MIB [21], atmVclTable
                                 FRF.8 [17], 5.3.1.4"
                       ::= { frAtmIwfConnectionEntry 15 }

frAtmIwfConnFailedAal5PduTranslate OBJECT-TYPE

             SYNTAX      Counter32
             UNITS       "PDUs"
             MAX-ACCESS  read-only
             STATUS      current
             DESCRIPTION
                     "This attribute counts the number of AAL5 PDUs
                     discarded by the IWF because, while operating in
                     Translation Mode, the IWF is unable to decode the
                     incoming AAL5 PDU payload header according to the
                     mapping rules. (i.e., payload header not
                     recognized by the IWF).

AAL5 PDUs are received in the ATM to frame relay direction of the PVC.

When operating in Transparent Mode, the IWF MUST return noSuchInstance."

                       REFERENCE
                                "FRF.8 [17], Section 5.3.1"
                       ::= { frAtmIwfConnectionEntry 16 }

frAtmIwfConnOverSizedSDUs OBJECT-TYPE

             SYNTAX      Counter32
             UNITS       "SDUs"
             MAX-ACCESS  read-only
             STATUS      current
             DESCRIPTION
                     "Count of AAL5 SDUs discarded by the IWF because
                     the SDU is too large to be forwarded on the frame
                     relay segment of the connection.  Specifically,
                     the frame does not conform to the size specified
                     in the frLportFragSize object of the FRS MIB [19].

AAL5 PDUs are received in the ATM to frame relay direction of the PVC."

REFERENCE

"FRS MIB [19], frLportTable

                                 FRF.8 [17], 5.3.1.4"
                       ::= { frAtmIwfConnectionEntry 17 }

frAtmIwfConnCrcErrors OBJECT-TYPE

             SYNTAX      Counter32
             UNITS       "PDUs"
             MAX-ACCESS  read-only
             STATUS      current
             DESCRIPTION
                     "The number of AAL5 CPCS PDUs received with CRC-32
                     errors on this AAL5 VCC at the IWF.

AAL5 PDUs are received in the ATM to frame relay direction of the PVC."

                       REFERENCE
                                "ATM MIB [21], atmVclTable"
                       ::= { frAtmIwfConnectionEntry 18 }

frAtmIwfConnSarTimeOuts OBJECT-TYPE

             SYNTAX      Counter32
             UNITS       "PDUs"
             MAX-ACCESS  read-only
             STATUS      current
             DESCRIPTION
                     "The number of partially re-assembled AAL5 CPCS
                     PDUs which were discarded on this AAL5 VCC at the
                     IWF because they were not fully re-assembled
                     within the required time period.  If the re-
                     assembly timer is not supported, then this object
                     contains a zero value.

AAL5 PDUs are received in the ATM to frame relay direction of the PVC."

                       REFERENCE
                                "ATM MIB [21], atmVclTable"
                       ::= { frAtmIwfConnectionEntry 19 }
         
         --
         -- The FR/ATM PVC Service IWF Connection Descriptor Group
         --
         --     The Frame Relay/ATM PVC Service Interworking Function
         --     Connection Descriptor table.  A descriptor provides the
         --     attributes for a type of interworked connection.
         --

frAtmIwfConnectionDescriptorIndexNext OBJECT-TYPE

              SYNTAX      Integer32 (0..2147483647)
              MAX-ACCESS  read-only
              STATUS      current
              DESCRIPTION
                     "This object contains an appropriate value to be
                     used for frAtmIwfConnectionDescriptorIndex  when
                     creating entries in the
                     frAtmIwfConnectionDescriptorTable. The value 0
                     indicates that no unassigned entries are
                     available. To obtain the
                     frAtmIwfConnectionDescriptorIndexNext value for a
                     new entry, the manager issues a management
                     protocol retrieval operation to obtain the current
                     value of this object.  After each retrieval, the
                     agent should modify the value to the next
                     unassigned index."
              ::= { frAtmIwfMIBObjects 3 }

frAtmIwfConnectionDescriptorTable OBJECT-TYPE

             SYNTAX      SEQUENCE OF FrAtmIwfConnectionDescriptorEntry
             MAX-ACCESS  not-accessible
             STATUS      current
             DESCRIPTION
                     "A table in which each row represents a descriptor
                     for one type of Frame Relay/ATM interworking
                     connection.  A descriptor may be assigned to zero
                     or more FR/ATM PVC service IWF connections."
             ::= { frAtmIwfMIBObjects 4 }

frAtmIwfConnectionDescriptorEntry OBJECT-TYPE

             SYNTAX      FrAtmIwfConnectionDescriptorEntry
             MAX-ACCESS  not-accessible
             STATUS      current
             DESCRIPTION
                     "An entry for a descriptor in an interworking
                     connection between a frame relay PVC and an ATM
                     PVC."
             INDEX   { frAtmIwfConnectionDescriptorIndex  }
             ::= { frAtmIwfConnectionDescriptorTable 1 }

FrAtmIwfConnectionDescriptorEntry ::=

SEQUENCE {

                 frAtmIwfConnectionDescriptorIndex      Integer32,
                 frAtmIwfConnDescriptorRowStatus        RowStatus,
                 frAtmIwfConnDeToClpMappingMode         INTEGER,
                 frAtmIwfConnClpToDeMappingMode         INTEGER,
                 frAtmIwfConnCongestionMappingMode      INTEGER,
                 frAtmIwfConnEncapsulationMappingMode   INTEGER,
                 frAtmIwfConnEncapsulationMappings      BITS,
                 frAtmIwfConnFragAndReassEnabled        INTEGER,
         
                 frAtmIwfConnArpTranslationEnabled      INTEGER
         }

frAtmIwfConnectionDescriptorIndex OBJECT-TYPE

             SYNTAX      Integer32 (1..2147483647)
             MAX-ACCESS  not-accessible
             STATUS      current
             DESCRIPTION
                     "A unique value to identify a descriptor in the
                     table "
             ::= { frAtmIwfConnectionDescriptorEntry 1 }

frAtmIwfConnDescriptorRowStatus OBJECT-TYPE

             SYNTAX      RowStatus
             MAX-ACCESS  read-create
             STATUS      current
             DESCRIPTION
                     "The status of this table row.  This object is
                     used to create or delete an entry in the
                     descriptor table.

Creation of the row requires a row index (see frAtmIwfConnectionDescriptorIndexNext). If not explicitly set or in existence, all other columns of the row will be created and initialized to the default value. During creation, this object MAY be set to 'createAndGo(4)' or 'createAndWait(5)'. The object MUST contain the value 'active(1)' before any connection table entry references the row.

                     To destroy a row in this table, this object is set
                     to the 'destroy(6)' action.  Row destruction MUST
                     fail (error code 'inconsistentValue') if any
                     connection references the row."
             ::= { frAtmIwfConnectionDescriptorEntry 2 }

frAtmIwfConnDeToClpMappingMode OBJECT-TYPE

             SYNTAX      INTEGER {
                            mode1(1),
                            mode2Const0(2),
                            mode2Const1(3)
                         }
             MAX-ACCESS  read-create
             STATUS      current
             DESCRIPTION
                     "This object describes which mode of translation
                     is in use for loss priority mapping in the frame

relay to ATM direction.

                     mode1(1)        = the DE field in the Q.922 core
                                       frame shall be mapped to the ATM
                                       CLP field of every cell
                                       generated by the segmentation
                                       process of the AAL5 PDU
                                       containing the information of
                                       that frame.

mode2Contst0(2) = the ATM CLP field of every cell

generated by the segmentation process of the AAL5 PDU containing the information of that frame shall be set to constant 0.

                     mode2Contst1(3) = the ATM CLP field of every cell
                                       generated by the segmentation
                                       process of the AAL5 PDU
                                       containing the information of
                                       that frame shall be set to
                                       constant 1."
             REFERENCE
                      "FRF.8 [17], Section 4.2.1"
             DEFVAL { mode1 }
             ::= { frAtmIwfConnectionDescriptorEntry 3 }

frAtmIwfConnClpToDeMappingMode OBJECT-TYPE

             SYNTAX      INTEGER {
                           mode1(1),
                           mode2Const0(2),
                           mode2Const1(3)
                         }
             MAX-ACCESS  read-create
             STATUS      current
             DESCRIPTION
                     "This object describes which mode of translation
                     is in use for loss priority mapping in the ATM to
                     frame relay direction.
             
                     mode1(1)       = if one or more cells in a frame
                                      has its CLP field set, the DE
                                      field of the Q.922 core frame
                                      should be set.

mode2Const0(2) = the DE field of the Q.922 core

frame should be set to the constant 0.

                     mode2Const1(3) = the DE field of the Q.922 core
                                      frame should be set to the
                                      constant 1."
             REFERENCE
                      "FRF.8 [17], Section 4.2.2"
             DEFVAL { mode1 }
             ::= { frAtmIwfConnectionDescriptorEntry 4 }

frAtmIwfConnCongestionMappingMode OBJECT-TYPE

             SYNTAX      INTEGER {
                            mode1(1),
                            mode2(2)
                         }
             MAX-ACCESS  read-create
             STATUS      current
             DESCRIPTION
                     "This object describes which mode of translation
                     is in use for forward congestion indication
                     mapping in the frame relay to ATM direction.

mode1(1) = The FECN field in the Q.922 core frame

shall be mapped to the ATM EFCI field of every cell generated by the segmentation process of the AAL5 PDU containing the information of that frame.

mode2(2) = The FECN field in the Q.922 core frame

shall not be mapped to the ATM EFCI field of cells generated by the segmentation process of the AAL5 PDU containing the information of that frame. The EFCI field is always set to 'congestion not experienced'.

                     In both of the modes above, if there is congestion
                     in the forward direction in the ATM layer within
                     the IWF, then the IWF can set the EFCI field to
                     'congestion experienced'."
             REFERENCE
                         "FRF.8 [17], Section 4.3.1.1"
             DEFVAL      { mode1 }
             ::= { frAtmIwfConnectionDescriptorEntry 5 }

frAtmIwfConnEncapsulationMappingMode OBJECT-TYPE

             SYNTAX      INTEGER {
             
                            transparentMode(1),
                            translationMode(2),
                            translationModeAll(3)
                         }
             MAX-ACCESS  read-create
             STATUS      current
             DESCRIPTION
                     "This object indicates whether the mapping of
                     upper layer protocol encapsulation is enabled on
                     this interworking connection.

transparentMode(1) = Forward the encapsulations

unaltered.

translationMode(2) = Perform mapping between the

two encapsulations due to the incompatibilities of the two methods. Mapping is provided for a subset of the potential encapsulations as itemized in frAtmIwfConnEncapsulationMapp ings.

                     translationModeAll(3) = Perform mapping between
                                          the two encapsulations due to
                                          the incompatibilities of the
                                          two methods. All
                                          encapsulations are
                                          translated."
             REFERENCE
                         "FRF.8 [17], Section 5.3"
             DEFVAL      { transparentMode }
             ::= { frAtmIwfConnectionDescriptorEntry 6 }

frAtmIwfConnEncapsulationMappings OBJECT-TYPE

             SYNTAX      BITS {
                    none (0),
                    bridgedPdus(1),
                    bridged802dot6(2),
                    bPdus(3),
                    routedIp(4),
                    routedOsi(5),
                    otherRouted(6),
                    x25Iso8202(7),
                    q933q2931(8) }
             MAX-ACCESS  read-create
             STATUS      current
             DESCRIPTION

"If upper layer protocol encapsulation mapping is enabled on this interworking connection, then this attribute enumerates which of the encapsulation mappings are supported.

                     none(0)           = Transparent mode operation
                     bridgedPdus(1)    = PID: 0x00-01,-07,-02 or -08
                     bridged802dot6(2) = PID: 0x00-0B
                     bPdus(3)          = PID: 0x00-0E or -0F
                     routedIp(4)       = NLPID: OxCC
                     routedOsi(5)      = NLPID: Ox81, 0x82 or 0x83
                     otherRouted(6)    = Other routed protocols
                     x25Iso8202(7)     = X25
                     q933q2931(8)      = Q.933 and Q.2931"
             REFERENCE
                         "FRF.8 [17], Section 5.3.1"
             DEFVAL      { { none } }
             ::= { frAtmIwfConnectionDescriptorEntry 7 }

frAtmIwfConnFragAndReassEnabled OBJECT-TYPE

             SYNTAX      INTEGER { enabled(1),  disabled(2)}
             MAX-ACCESS  read-create
             STATUS      current
             DESCRIPTION
                     "The attribute indicates whether fragmentation and
                     reassembly is enabled for this connection."
             REFERENCE
                         "FRF.8 [17], Section 5.3.1.4"
             DEFVAL      { disabled }
             ::= { frAtmIwfConnectionDescriptorEntry 8 }

frAtmIwfConnArpTranslationEnabled OBJECT-TYPE

             SYNTAX      INTEGER { enabled(1),  disabled(2)}
             MAX-ACCESS  read-create
             STATUS      current
             DESCRIPTION
                     "The attribute indicates whether ARP translation
                     is enabled for this connection."
             REFERENCE
                         "FRF.8 [17], Section 5.4"
             DEFVAL      { disabled }
             ::= { frAtmIwfConnectionDescriptorEntry 9 }
         
         --
         -- Augmentation of ATM MIB VCL Endpoint Table (atmVclTable)
         --
         frAtmIwfVclTable OBJECT-TYPE
             SYNTAX      SEQUENCE OF FrAtmIwfVclEntry
             MAX-ACCESS  not-accessible
             STATUS      current
             DESCRIPTION
                     "The FR/ATM IWF VCL Table augments the ATM MIB VCL
                     Endpoint table."
             ::= { frAtmIwfMIBObjects 5 }

frAtmIwfVclEntry OBJECT-TYPE

             SYNTAX      FrAtmIwfVclEntry
             MAX-ACCESS  not-accessible
             STATUS      current
             DESCRIPTION
                     "Entries in this table are created only by the
                     agent. One entry exists for each ATM VCL managed
                     by the agent."
             AUGMENTS    { atmVclEntry }
             ::= { frAtmIwfVclTable 1 }
         
         FrAtmIwfVclEntry ::= SEQUENCE {
             frAtmIwfVclCrossConnectIdentifier    Integer32
         }

frAtmIwfVclCrossConnectIdentifier OBJECT-TYPE

             SYNTAX      Integer32  (1..2147483647)
             MAX-ACCESS  read-only
             STATUS      current
             DESCRIPTION
                     "This object contains the index value of the
                     FR/ATM cross-connect table entry used to link the
                     ATM VCL with a frame relay PVC.

Each row of the atmVclTable that is not cross- connected with a frame relay PVC MUST return the value zero when this object is read.

In the case of (frame relay) point to (ATM) multipoint, multiple ATM VCLs will have the same value of this object, and all their cross- connections are identified by entries that are indexed by the same value of frAtmIwfVclCrossConnectIdentifier in the frAtmIwfConnectionTable of this MIB module.

                     The value of this object is initialized by the
                     agent after the associated entries in the
                     frAtmIwfConnectionTable have been created."
             ::= { frAtmIwfVclEntry 1 }
         
         --
         -- Frame Relay/ATM PVC Service Interworking NOTIFICATION
         --

frAtmIwfConnStatusChange NOTIFICATION-TYPE

             OBJECTS {   frAtmIwfConnAdminStatus,
                         frAtmIwfConnAtm2FrOperStatus,
                         frAtmIwfConnFr2AtmOperStatus
                      }
             STATUS      current
             DESCRIPTION
                     "An indication that the status of this
                     interworking connection has changed."
             ::= { frAtmIwfTrapsPrefix 1 }
         
         --
         -- Conformance Information
         --
         
         --
         -- Compliance Statement For Equipment
         --

frAtmIwfEquipmentCompliance MODULE-COMPLIANCE

             STATUS      current
             DESCRIPTION
                     "The compliance statement for equipment that
                     implements the FR/ATM Interworking MIB."

MODULE -- this module

MANDATORY-GROUPS { frAtmIwfBasicGroup,

frAtmIwfConnectionDescriptorGroup, frAtmIwfAtmVclTableAugmentGroup, frAtmIwfNotificationsGroup }

                 OBJECT      frAtmIwfConnDeToClpMappingMode
                 SYNTAX      INTEGER { mode1(1) }
                 DESCRIPTION
                     "Only support for Mode 1 is REQUIRED."
                 
                 OBJECT      frAtmIwfConnClpToDeMappingMode
                 SYNTAX      INTEGER { mode1(1) }
                 DESCRIPTION
                     "Only support for Mode 1 is REQUIRED."
                 
                 OBJECT      frAtmIwfConnCongestionMappingMode
                 SYNTAX      INTEGER { mode1(1) }
                 DESCRIPTION

"Only support for Mode 1 is REQUIRED."

                 OBJECT      frAtmIwfConnEncapsulationMappingMode
                 SYNTAX      INTEGER { transparentMode(1) }
                 DESCRIPTION
                     "Support for Translation Mode is OPTIONAL."
                 
                 OBJECT      frAtmIwfConnEncapsulationMappings
                 SYNTAX      BITS { none(0) }
                 DESCRIPTION
                     "The IWF may provide one, some or none of the
                     encapsulation translations defined in section
                     5.3.1 of FRF.8 [17]."
                 
                 OBJECT      frAtmIwfConnFragAndReassEnabled
                 SYNTAX      INTEGER { disabled(2) }
                 DESCRIPTION
                     "Only support for Mode 1 is REQUIRED."
                 
                 OBJECT      frAtmIwfConnArpTranslationEnabled
                 SYNTAX      INTEGER { disabled(2) }
                 DESCRIPTION
                     "Support for ARP Translation is NOT REQUIRED."
             
             ::= { frAtmIwfCompliances 1 }
         
         --
         -- Compliance Statement For Service (CNM Interface)
         --

frAtmIwfServiceCompliance MODULE-COMPLIANCE

             STATUS  current
             DESCRIPTION
                     "The compliance statement for a CNM interface that
                     implements the FR/ATM Interworking MIB."
             
             MODULE  -- this module
                 MANDATORY-GROUPS { frAtmIwfBasicGroup,
                                    frAtmIwfConnectionDescriptorGroup,
                                    frAtmIwfAtmVclTableAugmentGroup,
                                    frAtmIwfNotificationsGroup }
             
                 --
                 -- Exceptions for each object type implemented for a
                 -- CNM view of the FR/ATM Interworking MIB
                 --
                 OBJECT      frAtmIwfConnAdminStatus
                 MIN-ACCESS  read-only

DESCRIPTION

"Write access is not REQUIRED."

                 OBJECT      frAtmIwfConnDeToClpMappingMode
                 SYNTAX      INTEGER { mode1(1) }
                 MIN-ACCESS  read-only
                 DESCRIPTION
                     "Support for Mode 1 is REQUIRED.  Other modes are
                     OPTIONAL.  Write access is NOT REQUIRED."
                 
                 OBJECT      frAtmIwfConnClpToDeMappingMode
                 SYNTAX      INTEGER { mode1(1) }
                 MIN-ACCESS  read-only
                 DESCRIPTION
                     "Support for Mode 1 is REQUIRED.  Other modes are
                     OPTIONAL.  Write access is NOT REQUIRED."
                 
                 OBJECT      frAtmIwfConnCongestionMappingMode
                 SYNTAX      INTEGER { mode1(1) }
                 MIN-ACCESS  read-only
                 DESCRIPTION
                     "Support for Mode 1 is REQUIRED.  Other modes are
                     OPTIONAL.  Write access is NOT REQUIRED."
                 
                 OBJECT      frAtmIwfConnEncapsulationMappingMode
                 SYNTAX      INTEGER { transparentMode(1) }
                 MIN-ACCESS  read-only
                 DESCRIPTION
                     "Support for Transparent Mode is REQUIRED.
                     Translation Mode is OPTIONAL.  Write access is not
                     required."
                 
                 OBJECT      frAtmIwfConnEncapsulationMappings
                 SYNTAX      BITS { none(0) }
                 MIN-ACCESS  read-only
                 DESCRIPTION
                     "The IWF may provide one, some or none of the
                     encapsulation translations defined in section
                     5.3.1 of FRF.8 [17]. Write access is not
                     required."
                 
                 OBJECT      frAtmIwfConnFragAndReassEnabled
                 SYNTAX      INTEGER { disabled(2) }
                 MIN-ACCESS  read-only
                 DESCRIPTION
                     "Support for Fragmentation and Reassembly is NOT
                     REQUIRED.  Write access is not required."
                 
                 OBJECT      frAtmIwfConnArpTranslationEnabled
                 SYNTAX      INTEGER { disabled(2) }
                 MIN-ACCESS  read-only
                 DESCRIPTION
                     "Support for ARP Translation is not required.
                     Write access is not required."
                 
                 OBJECT      frAtmIwfConnRowStatus
                 MIN-ACCESS  read-only
                 DESCRIPTION
                     "Write access is not required."
             
             ::= { frAtmIwfCompliances 2 }
         
         --
         -- Units of Conformance
         --
         
         --
         -- Basic FR/ATM IWF PVC Connection Group
         --
         frAtmIwfBasicGroup    OBJECT-GROUP
             OBJECTS { frAtmIwfConnIndexNext,
                       frAtmIwfConnAdminStatus,
                       frAtmIwfConnAtm2FrOperStatus,
                       frAtmIwfConnAtm2FrLastChange,
                       frAtmIwfConnFr2AtmOperStatus,
                       frAtmIwfConnFr2AtmLastChange,
                       frAtmIwfConnectionDescriptor,
                       frAtmIwfConnFailedFrameTranslate,
                       frAtmIwfConnOverSizedFrames,
                       frAtmIwfConnFailedAal5PduTranslate,
                       frAtmIwfConnOverSizedSDUs,
                       frAtmIwfConnCrcErrors,
                       frAtmIwfConnSarTimeOuts,
                       frAtmIwfConnRowStatus }
             STATUS  current
             DESCRIPTION
                     "The collection of basic objects for configuration
                     and control of FR/ATM interworking connections."
             ::= { frAtmIwfGroups 1 }
         
         --
         -- FR/ATM IWF PVC Connection Descriptor Group
         --
         
         frAtmIwfConnectionDescriptorGroup    OBJECT-GROUP
             OBJECTS {
                 frAtmIwfConnectionDescriptorIndexNext,
                 frAtmIwfConnDeToClpMappingMode,
                 frAtmIwfConnClpToDeMappingMode,
                 frAtmIwfConnCongestionMappingMode,
                 frAtmIwfConnEncapsulationMappingMode,
                 frAtmIwfConnEncapsulationMappings,
                 frAtmIwfConnFragAndReassEnabled,
                 frAtmIwfConnArpTranslationEnabled,
                 frAtmIwfConnDescriptorRowStatus
                 }
             STATUS  current
             DESCRIPTION
                     "The collection of basic objects for specification
                     of FR/ATM interworking connection descriptors."
             ::= { frAtmIwfGroups 2 }
         
         --
         -- ATM MIB VCL Endpoint Table Augmentation Group
         --
         
         frAtmIwfAtmVclTableAugmentGroup    OBJECT-GROUP
             OBJECTS {
                 frAtmIwfVclCrossConnectIdentifier
                 }
             STATUS  current
             DESCRIPTION
                     "The ATM MIB VCL Endpoint Table AUGMENT object
                     contained in the FR/ATM PVC Service Interworking
                     MIB."
             ::= { frAtmIwfGroups 3 }
         
         --
         -- Notification Group
         --
         
         frAtmIwfNotificationsGroup NOTIFICATION-GROUP
             NOTIFICATIONS { frAtmIwfConnStatusChange }
             STATUS  current
             DESCRIPTION
                     "The notification for FR/ATM interworking status
                     change."
             ::= { frAtmIwfGroups 4 }
         END

8. Acknowledgments

This document was produced by the Frame Relay Service MIB Working Group.

The Editors thank Bert Wijnen, Kaj Tesink, Keith McCloghrie, and David Perkins for providing many helpful comments and suggestions.

9. References

   [1]  Harrington, D., Presuhn, R. and B. Wijnen, "An Architecture for
   
        Describing SNMP Management Frameworks", RFC 2571, April 1999.
   
   [2]  Rose, M. and K. McCloghrie, "Structure and Identification of
        Management Information for TCP/IP-based Internets", STD 16, RFC
        1155, May 1990.
   
   [3]  Rose, M. and K. McCloghrie, "Concise MIB Definitions", STD 16,
        RFC 1212, March 1991.
   
   [4]  Rose, M., "A Convention for Defining Traps for use with the
        SNMP", RFC 1215, March 1991.
   
   [5]  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.
   
   [6]  McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose,
        M. and S. Waldbusser, "Textual Conventions for SMIv2", STD 58,
        RFC 2579, April 1999.
   
   [7]  McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose,
        M. and S. Waldbusser, "Conformance Statements for SMIv2", STD
        58, RFC 2580, April 1999.
   
   [8]  Case, J., Fedor, M., Schoffstall, M. and J. Davin, "Simple
        Network Management Protocol", STD 15, RFC 1157, May 1990.
   
   [9]  Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
        "Introduction to Community-based SNMPv2", RFC 1901, January
        1996.
   
   [10] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Transport
        Mappings for Version 2 of the Simple Network Management Protocol
        (SNMPv2)", RFC 1906, January 1996.
   
   [11] Case, J., Harrington D., Presuhn R. and B. Wijnen, "Message
        Processing and Dispatching for the Simple Network Management
        Protocol (SNMP)", RFC 2572, April 1999.
   
   [12] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM)
        for version 3 of the Simple Network Management Protocol
        (SNMPv3)", RFC 2574, April 1999.
   
   [13] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Protocol
        Operations for Version 2 of the Simple Network Management
        Protocol (SNMPv2)", RFC 1905, January 1996.
   
   [14] Levi, D., Meyer, P. and B. Stewart, "SNMPv3 Applications", RFC
        2573, April 1999.
   
   [15] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based Access
        Control Model (VACM) for the Simple Network Management Protocol
        (SNMP)", RFC 2575, April 1999.
   
   [16] Case, J., Mundy, R., Partain, D. and B. Stewart, "Introduction
        to Version 3 of the Internet-standard Network Management
        Framework", RFC 2570, April 1999.
   
   [17] Frame Relay/ATM PVC Service Interworking Implementation
        Agreement, Frame Relay Forum, Document Number FRF.8.1, March,
        2000.
   
   [18] Noto, M., Spiegel, E. and K. Tesink, "Definitions of Textual
        Conventions and OBJECT-IDENTITIES for ATM Management", RFC 2514,
        February 1999.
   
   [19] Rehbehn, K. and D. Fowler, "Definitions of Managed Objects for
        Frame Relay Service", RFC 2954, October 2000.
   
   [20] Frame Relay/ATM PVC Network Interworking Implementation
        Agreement, Frame Relay Forum, Document Number FRF.5, December
        20, 1994.
   
   [21] Tesink, K., "Definitions of Managed Objects for ATM Management",
        RFC 2515, February 1999.
   
   [22] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB",
        RFC 2863, June 2000.
   
   [23] Bradner, S., "Key words for use in RFCs to Indicate Requirement
        Levels", BCP 14, RFC 2119, March 1997.
   
   [24] Brown, C. and F. Baker, "Management Information Base for Frame
        Relay DTEs Using SMIv2", RFC 2115, September 1997.

10. Security Considerations

There are a number of management objects defined in this MIB that have 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.

No managed objects in this MIB contain sensitive information.

SNMPv1 by itself is not a secure environment. 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.

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 RFC 2574 [12] and the View-based Access Control Model RFC 2575 [15] is recommended.

It is then a customer/user responsibility to ensure that the SNMP entity giving access to an instance of this MIB, 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. Authors' Addresses

Kenneth Rehbehn
Megisto Systems, Inc.
20251 Century Boulevard
Germantown, MD, USA 20874

   Phone: +1 (301) 515-3672
   EMail: krehbehn@megisto.com

Orly Nicklass
RAD Data Communications, Ltd.
12 Hanechoshet St.
Tel Aviv 69710
Israel

   Phone: +972 (3) 6459588
   EMail: orly_n@rad.co.il
   
   George Mouradian
   AT&T Labs,  Room 1G-325
   101 Crawfords Corner Road
   Holmdel, NJ  USA  07733
   
   Phone: +1 908 949 7671
   EMail: gvm@att.com

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