RFCs in HTML Format


RFC 1382

Network Working Group                                  D. Throop, Editor
Request for Comments: 1382                      Data General Corporation
                                                           November 1992


              SNMP MIB Extension for the X.25 Packet Layer

Table of Contents

   1. The Network Management Framework .......................    2
   2. Objects ................................................    2
   2.1 Format of Definitions .................................    3
   3. Overview ...............................................    3
   3.1 Informal Overview .....................................    3
   3.2 Textual Conventions ...................................    4
   3.3 Structure of MIB ......................................    4
   3.4 Tables ................................................    5
   3.5 Table Usage ...........................................    6
   3.6 Conformance ...........................................    6
   4. Object Definitions .....................................    7
   5. Appendix: Revision History .............................   62
      July 30 1992 ...........................................   62
      June 26 1992 ...........................................   62
      June 1992 ..............................................   63
      April 1992 .............................................   63
      February 1992 ..........................................   65
      October 1991 ...........................................   65
      June 1991 ..............................................   66
      April 1991 .............................................   66
   6. Acknowledgements .......................................   66



Throop                                                          [Page 1]

RFC 1382 X.25 Packet Layer MIB November 1992 7. References ............................................. 67 8. Security Considerations ................................ 68 9. Author's Address ....................................... 69 1. The Network Management Framework The Internet-standard Network Management Framework consists of three components. These components give the rules for defining objects, the definitions of objects, and the protocol for manipulating objects. The network management framework structures objects in an abstract information tree. The branches of the tree name objects and the leaves of the tree contain the values manipulated to effect management. This tree is called the Management Information Base or MIB. The concepts of this tree are given in STD 16/RFC 1155, "The Structure of Management Information" or SMI [1]. The SMI defines the trunk of the tree and the types of objects used when defining the leaves. STD 16/RFC 1212, "Towards Concise MIB Definitions" [4], defines a more concise description mechanism that preserves all the principals of the SMI. The core MIB definitions for the Internet suite of protocols can be found in RFC 1156 [2] "Management Information Base for Network Management of TCP/IP-based internets". STD 17/RFC 1213 [5] defines MIB-II, an evolution of MIB-I with changes to incorporate implementation experience and new operational requirements. STD 15/RFC 1157 [3] defines the SNMP protocol itself. The protocol defines how to manipulate the objects in a remote MIB. The tree structure of the MIB allows new objects to be defined for the purpose of experimentation and evaluation. 2. Objects The definition of an object in the MIB requires an object name and type. Object names and types are defined using the subset of Abstract Syntax Notation One (ASN.1) [6] defined in the SMI [1]. Objects are named using ASN.1 object identifiers, administratively assigned names, to specify object types. The object name, together with an optional object instance, uniquely identifies a specific instance of an object. For human convenience, we often use a textual string, termed the OBJECT DESCRIPTOR, to also refer to objects. Objects also have a syntax that defines the abstract data structure corresponding to that object type. The ASN.1 language [6] provides the primitives used for this purpose. The SMI [1] purposely Throop [Page 2]
RFC 1382 X.25 Packet Layer MIB November 1992 restricts the ASN.1 constructs which may be used for simplicity and ease of implementation. The encoding of an object type simply describes how to represent an object using ASN.1 encoding rules [7], for purposes of dealing with the SNMP protocol. 2.1. Format of Definitions Section 4 contains the specification of all object types defined in this MIB module. The object types are defined using the conventions defined in the SMI, as amended by the extensions specified in "Towards Concise MIB Definitions" [4]. 3. Overview 3.1. Informal Overview This section describes how the objects defined below relate with other MIBs. This section is only informational to help understand how the pieces fit together. The objects defined below are used in conjunction with MIB-II and other MIBs such as the LAPB MIB [9]. A system with a complete X.25 stack running over a synchronous line will have at least two interfaces in the ifTable defined in MIB-II. There will be an interface for LAPB and another interface for the packet layer of X.25. There will also be objects defined in the RS-232-like MIB for the physical sync line. Each software interface identifies the layer below it used to send and receive packets. The X.25 MIB object, defined below, x25OperDataLinkId, specifies an instance of lapbAdmnIndex for the LAPB interface under that X.25. The LAPB object, lapbOperPortId, identifies an instance of the rs232PortIndex for the the Sync line used by LAPB. For X.25 running over LAPB over Ethernet, the lapbOperPortId would identify the instance of ifIndex for the Ethernet interface. Each X.25 subnetwork will have separate entries in the ifTable. Thus a system with two X.25 lines would have two ifTable entries for the two X.25 packet layers and two other entries for the two LAPB interfaces. Each X.25 Packet Layer MIB would identify the instance of the LAPB MIB for the interface below it. Each LAPB MIB would identify the Sync line below it. The system would also have two entries in the rs232PortTable and rs232SyncPortTable for the two physical lines. Since the ifTable as defined in MIB-II is device independent, it doesn't have anything specific for any type of interface. The Throop [Page 3]
RFC 1382 X.25 Packet Layer MIB November 1992 objects below define the X.25 packet layer specific information for an interface of type X.25. Different X.25 interfaces can also be differentiated by matching the values of ifIndex with x25AdmnIndex. 3.2. Textual Conventions This MIB introduces a new data type as a textual convention for use with X.25. This textual convention enhances the readability of the specification and can ease comparison with other specifications if appropriate. It should be noted that the introduction of such textual conventions has no effect on either the syntax nor the semantics of any managed objects. These conventions are merely an artifact of the explanatory method used. Objects defined in terms of one of these methods are always encoded by means of the rules that define the primitive type. Hence, no changes to the SMI or the SNMP are necessary to accommodate these textual conventions which are adopted merely for the convenience of readers and writers in pursuit of the elusive goal of clear, concise, and unambiguous MIB documents. This MIB introduces the data type of: X121Address 3.3. Structure of MIB Instances of the objects defined below represent attributes of an X.25 Packet Layer interface. At present these interfaces are identified by an ifType object in the Internet-standard MIB-II [5] of: ddn-x25(4), and rfc887-x25(5). For these interfaces, the value of the ifSpecific variable in the MIB-II [5] has the OBJECT IDENTIFIER value: x25 OBJECT IDENTIFIER ::= { transmission 5 } The objects defined below are similar to those defined in a draft ISO document for X.25 management [11]. Some object definitions also reference the ISO specification for X.25 [10] to specify the section that will give the reader additional information about the object. Access to those documents maybe useful (but isn't essential) to understand the names and semantics of some objects. The similarity of these objects with the ISO objects minimizes the instrumentation required by those systems that support both OSI and TCP/IP management protocols. Throop [Page 4]
RFC 1382 X.25 Packet Layer MIB November 1992 Since the objects defined here are extensions to the Internet Standard MIB [2] and thus also an extension of the second version, MIB-II [5], the objects defined here explicitly do not duplicate objects defined in existing standards. In some instances clarification of how to apply those objects has been given. The relationship between an X.25 Packet Layer interface and an interface in the context of the Internet-standard MIB [5] is one-to- one. As such, the value of an ifIndex object instance can be directly used to identify corresponding instances of the objects defined below. 3.4. Tables The objects below form several tables. These tables are: x25AdmnTable x25OperTable x25StatTable x25ChannelTable x25CircuitTable x25ClearedCircuitTable x25CallParmTable The x25AdmnTable defines objects for the parameters of an X.25 interface which the administrator can read and set. These objects are used at interface initialization time to start the interface. Once the interface has started, changes to the objects in the Administration table may not take affect until the interface is re- initialized. The x25OperTable defines objects that report the current parameters used by a running interface. These objects are read-only. The x25StatTable defines objects that report operational statistics for an X.25 interface. These are read-only counters of events that occurred at the interface. The x25ChannelTable defines objects to allow the administrator to manage the division of channel numbers. The x25CircuitTable defines objects that return information about existing X.25 circuits. These entries result from calls placed or answered by the PLE or from PVCs. The x25ClearedCircuitTable contains objects for recording the termination information from circuits that cleared abnormally. Throop [Page 5]
RFC 1382 X.25 Packet Layer MIB November 1992 The x25CallParmTable defines the call parameters used to call other systems. This table contains call parameter entries which are referenced by other tables. For example, the x25AdmnTable has one object that identifies the entry in the table for the default PLE parameters. The x25CircuitTable has one object that identifies the entry in the x25CallParmTable for the parameters in use by that circuit. Other MIBs may also reference entries to identify call parameters to use to make X.25 calls. 3.5. Table Usage Different tables provide different functions. The administrator sets the starting X.25 parameters in the x25AdmnTable for the X.25 PLE; these objects include a reference to the x25CallParmTable entry to identify the default call parameters for the PLE. Once all the parameters are set, the administrator initializes the interface. As part of initializing the interface, the operating parameters are copied into the interface from the x25AdmnTable; these parameters are viewable by getting the objects in the x25OperTable. (The interface maybe started by setting the value of ifAdminStatus to up.) If any PVCs are configured, their parameters can be set in the the x25CircuitTable before initializing the interface; this should be done in conjunction with configuring higher layer entities to use the PVCs via the MIBs for those entities. Once the PLE completes initialization, it makes additional entries in the x25circuitTable for calls placed or answered. When a circuit is cleared, the status of the entry for the circuit is set to closed and, if the clear is abnormal, an entry will also be made in the x25ClearedCircuitTable. An entry in the x25CircuitTable with a status of closed maybe deleted by the agent at its convenience. A closed entry will always be reused at the time the PLE re-allocates the channel number of the entry for another call. The call parameters used for a circuit can be found by looking in the x25CircuitTable and following the x25CircuitCallParamId pointer to the entry in the x25CallParmTable that contains the parameters. There are no mechanisms in the X.25 MIB for telling the PLE to place an X.25 call. Such mechanisms belong in the MIBs for the higher layer entities that use the X.25 circuits. 3.6. Conformance All the objects defined here are mandatory. To claim conformance with this MIB an implementation must support all objects. However some objects pertain to features that are optional. There are values defined for those objects that indicate the implementation does not support the optional feature. The agent for such an implementation Throop [Page 6]
RFC 1382 X.25 Packet Layer MIB November 1992 must support reading the object and return the value that indicates the optional feature isn't supported and reject set requests to change the object. Some optional features have more than one object that pertain to it (window rotation has a timer, a count, and a counter for timer runouts). In such case, any object which indicates the optional feature isn't supported is sufficient to indicate the feature isn't supported and the values of the other objects relative to that feature are undefined. 4. Object Definitions RFC1382-MIB DEFINITIONS ::= BEGIN IMPORTS Counter, Gauge, TimeTicks FROM RFC1155-SMI OBJECT-TYPE FROM RFC 1212 DisplayString, transmission FROM RFC1213-MIB TRAP-TYPE FROM RFC 1215 EntryStatus FROM RFC1271-MIB PositiveInteger, IfIndexType FROM RFC1381-MIB; x25 OBJECT IDENTIFIER ::= { transmission 5 } -- Support of the X25 subtree and all subtrees under it -- is mandatory for all agents of system that implement X.25. X121Address ::= OCTET STRING (SIZE(0..17)) -- 0 to 17 bytes in length containing the ASCII -- characters [0-9], each octet contains one digit -- of the address. -- ########################################################### -- X.25 Administration Table -- ########################################################### x25AdmnTable OBJECT-TYPE Throop [Page 7]
RFC 1382 X.25 Packet Layer MIB November 1992 SYNTAX SEQUENCE OF X25AdmnEntry ACCESS not-accessible STATUS mandatory DESCRIPTION "This table contains the administratively set configuration parameters for an X.25 Packet Level Entity (PLE). Most of the objects in this table have corresponding objects in the x25OperTable. This table contains the values as last set by the administrator. The x25OperTable contains the values actually in use by an X.25 PLE. Changing an administrative value may or may not change a current operating value. The operating value may not change until the interface is restarted. Some implementations may change the values immediately upon changing the administrative table. All implementations are required to load the values from the administrative table when initializing a PLE." ::= { x25 1 } x25AdmnEntry OBJECT-TYPE SYNTAX X25AdmnEntry ACCESS not-accessible STATUS mandatory DESCRIPTION "Entries of x25AdmnTable." INDEX { x25AdmnIndex } ::= { x25AdmnTable 1 } X25AdmnEntry ::= SEQUENCE { x25AdmnIndex IfIndexType, x25AdmnInterfaceMode INTEGER, x25AdmnMaxActiveCircuits INTEGER, x25AdmnPacketSequencing INTEGER, x25AdmnRestartTimer PositiveInteger, x25AdmnCallTimer PositiveInteger, Throop [Page 8]
RFC 1382 X.25 Packet Layer MIB November 1992 x25AdmnResetTimer PositiveInteger, x25AdmnClearTimer PositiveInteger, x25AdmnWindowTimer PositiveInteger, x25AdmnDataRxmtTimer PositiveInteger, x25AdmnInterruptTimer PositiveInteger, x25AdmnRejectTimer PositiveInteger, x25AdmnRegistrationRequestTimer PositiveInteger, x25AdmnMinimumRecallTimer PositiveInteger, x25AdmnRestartCount INTEGER, x25AdmnResetCount INTEGER, x25AdmnClearCount INTEGER, x25AdmnDataRxmtCount INTEGER, x25AdmnRejectCount INTEGER, x25AdmnRegistrationRequestCount INTEGER, x25AdmnNumberPVCs INTEGER, x25AdmnDefCallParamId OBJECT IDENTIFIER, x25AdmnLocalAddress X121Address, x25AdmnProtocolVersionSupported OBJECT IDENTIFIER } x25AdmnIndex OBJECT-TYPE SYNTAX IfIndexType ACCESS read-only STATUS mandatory DESCRIPTION "The ifIndex value for the X.25 Interface." ::= { x25AdmnEntry 1 } x25AdmnInterfaceMode OBJECT-TYPE SYNTAX INTEGER { Throop [Page 9]
RFC 1382 X.25 Packet Layer MIB November 1992 dte (1), dce (2), dxe (3) } ACCESS read-write STATUS mandatory DESCRIPTION "Identifies DCE/DTE mode in which the interface operates. A value of dxe indicates the mode will be determined by XID negotiation." REFERENCE "10733 5.9 interfaceMode" ::= { x25AdmnEntry 2 } x25AdmnMaxActiveCircuits OBJECT-TYPE SYNTAX INTEGER (0..4096) ACCESS read-write STATUS mandatory DESCRIPTION "The maximum number of circuits this PLE can support; including PVCs." REFERENCE "10733 5.9 maxActiveCircuits; See ISO 8208, Section 3.7" ::= { x25AdmnEntry 3 } x25AdmnPacketSequencing OBJECT-TYPE SYNTAX INTEGER { modulo8 (1), modulo128 (2) } ACCESS read-write STATUS mandatory DESCRIPTION "The modulus of the packet sequence number space." REFERENCE "10733 extendedPacketSequencing; See ISO 8208 Section 7.1.1" ::= { x25AdmnEntry 4 } x25AdmnRestartTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-write STATUS mandatory DESCRIPTION "The T20 restart timer in milliseconds." REFERENCE "10733 5.9 restartTime See ISO 8208 Section 4.1, table 26" ::= { x25AdmnEntry 5 } Throop [Page 10]
RFC 1382 X.25 Packet Layer MIB November 1992 x25AdmnCallTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-write STATUS mandatory DESCRIPTION "The T21 Call timer in milliseconds." REFERENCE "10733 callTime; See ISO 8208 Section 5.2.1, table 26" ::= { x25AdmnEntry 6 } x25AdmnResetTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-write STATUS mandatory DESCRIPTION "The T22 Reset timer in milliseconds." REFERENCE "10733 resetTime; See ISO 8208 Section 8.1, table 26" ::= { x25AdmnEntry 7 } x25AdmnClearTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-write STATUS mandatory DESCRIPTION "The T23 Clear timer in milliseconds." REFERENCE "10733 clearTime; See ISO 8208 Section 5.5.1, table 26" ::= { x25AdmnEntry 8 } x25AdmnWindowTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-write STATUS mandatory DESCRIPTION "The T24 window status transmission timer in milliseconds. A value of 2147483647 indicates no window timer in use." REFERENCE "10733 5.10.1 windowTime (opt); See ISO 8208 Section 11.2.2, table 26" ::= { x25AdmnEntry 9 } x25AdmnDataRxmtTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-write STATUS mandatory DESCRIPTION "The T25 data retransmission timer in Throop [Page 11]
RFC 1382 X.25 Packet Layer MIB November 1992 milliseconds. A value of 2147483647 indicates no data retransmission timer in use." REFERENCE "10733 5.10.1 dataRetransmissionTime (opt); See ISO 8208 Section 11.2.1, table 26" ::= { x25AdmnEntry 10 } x25AdmnInterruptTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-write STATUS mandatory DESCRIPTION "The T26 interrupt timer in milliseconds. A value of 2147483647 indicates no interrupt timer in use." REFERENCE "10733 interruptTime; See ISO 8208 Section 6.8.1, table 26" ::= { x25AdmnEntry 11 } x25AdmnRejectTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-write STATUS mandatory DESCRIPTION "The T27 Reject retransmission timer in milliseconds. A value of 2147483647 indicates no reject timer in use." REFERENCE "10733 5.10.1 dataRejectTime (opt); See ISO 8208 Section 13.4.1, table 26" ::= { x25AdmnEntry 12 } x25AdmnRegistrationRequestTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-write STATUS mandatory DESCRIPTION "The T28 registration timer in milliseconds. A value of 2147483647 indicates no registration timer in use." REFERENCE "10733 5.8.1 registrationRequestTime (opt) See ISO 8208 Section 13.1.1.1, table 26" ::= { x25AdmnEntry 13 } x25AdmnMinimumRecallTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-write STATUS mandatory DESCRIPTION Throop [Page 12]
RFC 1382 X.25 Packet Layer MIB November 1992 "Minimum time interval between unsuccessful call attempts in milliseconds." REFERENCE "10733 5.9 minimum RecallTimer" ::= { x25AdmnEntry 14 } x25AdmnRestartCount OBJECT-TYPE SYNTAX INTEGER (0..65535) ACCESS read-write STATUS mandatory DESCRIPTION "The R20 restart retransmission count." REFERENCE "10733 5.9 restartCount; See ISO 8208 Section 4.1, table 27" ::= { x25AdmnEntry 15 } x25AdmnResetCount OBJECT-TYPE SYNTAX INTEGER (0..65535) ACCESS read-write STATUS mandatory DESCRIPTION "The r22 Reset retransmission count." REFERENCE "10733 resetCount; See section ISO 8208 8.1, table 27" ::= { x25AdmnEntry 16 } x25AdmnClearCount OBJECT-TYPE SYNTAX INTEGER (0..65535) ACCESS read-write STATUS mandatory DESCRIPTION "The r23 Clear retransmission count." REFERENCE "10733 clearCount; See ISO 8208 Section 5.5.1, table 27" ::= { x25AdmnEntry 17 } x25AdmnDataRxmtCount OBJECT-TYPE SYNTAX INTEGER (0..65535) ACCESS read-write STATUS mandatory DESCRIPTION "The R25 Data retransmission count. This value is irrelevant if the x25AdmnDataRxmtTimer indicates no timer in use." REFERENCE "10733 5.10.1 dataRetransmissionCount (opt) See ISO 8208 Section 11.2.1, table 27" ::= { x25AdmnEntry 18 } Throop [Page 13]
RFC 1382 X.25 Packet Layer MIB November 1992 x25AdmnRejectCount OBJECT-TYPE SYNTAX INTEGER (0..65535) ACCESS read-write STATUS mandatory DESCRIPTION "The R27 reject retransmission count. This value is irrelevant if the x25AdmnRejectTimer indicates no timer in use." REFERENCE "10733 5.10.1 dataRejectCount (opt)" ::= { x25AdmnEntry 19 } x25AdmnRegistrationRequestCount OBJECT-TYPE SYNTAX INTEGER (0..65535) ACCESS read-write STATUS mandatory DESCRIPTION "The R28 Registration retransmission Count. This value is irrelevant if the x25AdmnRegistrationRequestTimer indicates no timer in use." REFERENCE "10733 5.8.1 registrationRequestCount (opt); See ISO 8208 Section 13.1.1.1, table 27" ::= { x25AdmnEntry 20 } x25AdmnNumberPVCs OBJECT-TYPE SYNTAX INTEGER (0..4096) ACCESS read-write STATUS mandatory DESCRIPTION "The number of PVC configured for this PLE. The PVCs use channel numbers from 1 to this number." ::= { x25AdmnEntry 21 } x25AdmnDefCallParamId OBJECT-TYPE SYNTAX OBJECT IDENTIFIER ACCESS read-write STATUS mandatory DESCRIPTION "This identifies the instance of the x25CallParmIndex for the entry in the x25CallParmTable which contains the default call parameters for this PLE." ::= { x25AdmnEntry 22 } x25AdmnLocalAddress OBJECT-TYPE SYNTAX X121Address Throop [Page 14]
RFC 1382 X.25 Packet Layer MIB November 1992 ACCESS read-write STATUS mandatory DESCRIPTION "The local address for this PLE subnetwork. A zero length address maybe returned by PLEs that only support PVCs." REFERENCE "10733 5.9 localDTEAddress" ::= { x25AdmnEntry 23 } x25AdmnProtocolVersionSupported OBJECT-TYPE SYNTAX OBJECT IDENTIFIER ACCESS read-write STATUS mandatory DESCRIPTION "Identifies the version of the X.25 protocol this interface should support. Object identifiers for common versions are defined below in the x25ProtocolVersion subtree." REFERENCE "10733 5.9 protocolVersionSupported" ::= { x25AdmnEntry 24 } -- ########################################################### -- X.25 Operational Table -- ########################################################### x25OperTable OBJECT-TYPE SYNTAX SEQUENCE OF X25OperEntry ACCESS not-accessible STATUS mandatory DESCRIPTION "The operation parameters in use by the X.25 PLE." ::= { x25 2 } x25OperEntry OBJECT-TYPE SYNTAX X25OperEntry ACCESS not-accessible STATUS mandatory DESCRIPTION "Entries of x25OperTable." INDEX { x25OperIndex } ::= { x25OperTable 1 } X25OperEntry ::= SEQUENCE { x25OperIndex IfIndexType, x25OperInterfaceMode Throop [Page 15]
RFC 1382 X.25 Packet Layer MIB November 1992 INTEGER, x25OperMaxActiveCircuits INTEGER, x25OperPacketSequencing INTEGER, x25OperRestartTimer PositiveInteger, x25OperCallTimer PositiveInteger, x25OperResetTimer PositiveInteger, x25OperClearTimer PositiveInteger, x25OperWindowTimer PositiveInteger, x25OperDataRxmtTimer PositiveInteger, x25OperInterruptTimer PositiveInteger, x25OperRejectTimer PositiveInteger, x25OperRegistrationRequestTimer PositiveInteger, x25OperMinimumRecallTimer PositiveInteger, x25OperRestartCount INTEGER, x25OperResetCount INTEGER, x25OperClearCount INTEGER, x25OperDataRxmtCount INTEGER, x25OperRejectCount INTEGER, x25OperRegistrationRequestCount INTEGER, x25OperNumberPVCs INTEGER, x25OperDefCallParamId OBJECT IDENTIFIER, x25OperLocalAddress X121Address, x25OperDataLinkId OBJECT IDENTIFIER, x25OperProtocolVersionSupported OBJECT IDENTIFIER } Throop [Page 16]
RFC 1382 X.25 Packet Layer MIB November 1992 x25OperIndex OBJECT-TYPE SYNTAX IfIndexType ACCESS read-only STATUS mandatory DESCRIPTION "The ifIndex value for the X.25 interface." ::= { x25OperEntry 1 } x25OperInterfaceMode OBJECT-TYPE SYNTAX INTEGER { dte (1), dce (2), dxe (3) } ACCESS read-only STATUS mandatory DESCRIPTION "Identifies DCE/DTE mode in which the interface operates. A value of dxe indicates the role will be determined by XID negotiation at the Link Layer and that negotiation has not yet taken place." REFERENCE "10733 5.9 interfaceMode" ::= { x25OperEntry 2 } x25OperMaxActiveCircuits OBJECT-TYPE SYNTAX INTEGER (0..4096) ACCESS read-only STATUS mandatory DESCRIPTION "Maximum number of circuits this PLE can support." REFERENCE "10733 5.9 maxActiveCircuits See ISO 8208, Section 3.7" ::= { x25OperEntry 3 } x25OperPacketSequencing OBJECT-TYPE SYNTAX INTEGER { modulo8 (1), modulo128 (2) } ACCESS read-only STATUS mandatory DESCRIPTION "The modulus of the packet sequence number space." REFERENCE "10733 extendedPacketSequencing; See ISO 8208 Section 7.1.1" Throop [Page 17]
RFC 1382 X.25 Packet Layer MIB November 1992 ::= { x25OperEntry 4 } x25OperRestartTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-only STATUS mandatory DESCRIPTION "The T20 restart timer in milliseconds." REFERENCE "10733 5.9 restartTime; See ISO 8208 Section 4.1, table 26" ::= { x25OperEntry 5 } x25OperCallTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-only STATUS mandatory DESCRIPTION "The T21 Call timer in milliseconds." REFERENCE "10733 callTime; See ISO 8208 Section 5.2.1, table 26" ::= { x25OperEntry 6 } x25OperResetTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-only STATUS mandatory DESCRIPTION "The T22 Reset timer in milliseconds." REFERENCE "10733 resetTime; See ISO 8208 Section 8.1, table 26" ::= { x25OperEntry 7 } x25OperClearTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-only STATUS mandatory DESCRIPTION "The T23 Clear timer in milliseconds." REFERENCE "10733 clearTime; See ISO 8208 Section 5.5.1, table 26" ::= { x25OperEntry 8 } x25OperWindowTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-only STATUS mandatory DESCRIPTION "The T24 window status transmission timer Throop [Page 18]
RFC 1382 X.25 Packet Layer MIB November 1992 milliseconds. A value of 2147483647 indicates no window timer in use." REFERENCE "10733 5.10.1 windowTime (opt); See ISO 8208 Section 11.2.2, table 26" ::= { x25OperEntry 9 } x25OperDataRxmtTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-only STATUS mandatory DESCRIPTION "The T25 Data Retransmission timer in milliseconds. A value of 2147483647 indicates no data retransmission timer in use." REFERENCE "10733 5.10.1 dataRetransmissionTime (opt); See ISO 8208 Section 11.2.1, table 26" ::= { x25OperEntry 10 } x25OperInterruptTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-only STATUS mandatory DESCRIPTION "The T26 Interrupt timer in milliseconds. A value of 2147483647 indicates interrupts are not being used." REFERENCE "10733 interruptTime; See ISO 8208 Section 6.8.1, table 26" ::= { x25OperEntry 11 } x25OperRejectTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-only STATUS mandatory DESCRIPTION "The T27 Reject retransmission timer in milliseconds. A value of 2147483647 indicates no reject timer in use." REFERENCE "10733 5.10.1 dataRejectTime (opt); See ISO 8208 Section 13.4.1, table 26" ::= { x25OperEntry 12 } x25OperRegistrationRequestTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-only STATUS mandatory DESCRIPTION Throop [Page 19]
RFC 1382 X.25 Packet Layer MIB November 1992 "The T28 registration timer in milliseconds. A value of 2147483647 indicates no registration timer in use." REFERENCE "10733 5.8.1 registrationRequestTime (opt); See ISO 8208 Section 13.1.1.1, table 26" ::= { x25OperEntry 13 } x25OperMinimumRecallTimer OBJECT-TYPE SYNTAX PositiveInteger ACCESS read-only STATUS mandatory DESCRIPTION "Minimum time interval between unsuccessful call attempts in milliseconds." REFERENCE "10733 5.9 minimum RecallTimer" ::= { x25OperEntry 14 } x25OperRestartCount OBJECT-TYPE SYNTAX INTEGER (0..65535) ACCESS read-only STATUS mandatory DESCRIPTION "The R20 restart retransmission count." REFERENCE "10733 5.9 restartCount See ISO 8208 Section 4.1, table 27" ::= { x25OperEntry 15 } x25OperResetCount OBJECT-TYPE SYNTAX INTEGER (0..65535) ACCESS read-only STATUS mandatory DESCRIPTION "The r22 Reset retransmission count." REFERENCE "10733 resetCount; See section ISO 8208 8.1, table 27" ::= { x25OperEntry 16 } x25OperClearCount OBJECT-TYPE SYNTAX INTEGER (0..65535) ACCESS read-only STATUS mandatory DESCRIPTION "The r23 Clear retransmission count." REFERENCE "10733 clearCount; See ISO 8208 Section 5.5.1, table 27" ::= { x25OperEntry 17 } x25OperDataRxmtCount OBJECT-TYPE Throop [Page 20]
RFC 1382 X.25 Packet Layer MIB November 1992 SYNTAX INTEGER (0..65535) ACCESS read-only STATUS mandatory DESCRIPTION "The R25 Data retransmission count. This value is undefined if the x25OperDataRxmtTimer indicates no timer in use." REFERENCE "10733 5.10.1 dataRetransmissionCount (opt); See ISO 8208 Section 11.2.1, table 27" ::= { x25OperEntry 18 } x25OperRejectCount OBJECT-TYPE SYNTAX INTEGER (0..65535) ACCESS read-only STATUS mandatory DESCRIPTION "The R27 reject retransmission count. This value is undefined if the x25OperRejectTimer indicates no timer in use." REFERENCE "10733 5.10.1 dataRejectCount (opt)" ::= { x25OperEntry 19 } x25OperRegistrationRequestCount OBJECT-TYPE SYNTAX INTEGER (0..65535) ACCESS read-only STATUS mandatory DESCRIPTION "The R28 Registration retransmission Count. This value is undefined if the x25OperREgistrationRequestTimer indicates no timer in use." REFERENCE "10733 5.8.1 registrationRequestCount (opt); See ISO 8208 Section 13.1.1.1, table 27" ::= { x25OperEntry 20 } x25OperNumberPVCs OBJECT-TYPE SYNTAX INTEGER (0..4096) ACCESS read-only STATUS mandatory DESCRIPTION "The number of PVC configured for this PLE. The PVCs use channel numbers from 1 to this number." ::= { x25OperEntry 21 } x25OperDefCallParamId OBJECT-TYPE SYNTAX OBJECT IDENTIFIER Throop [Page 21]
RFC 1382 X.25 Packet Layer MIB November 1992 ACCESS read-only STATUS mandatory DESCRIPTION "This identifies the instance of the x25CallParmIndex for the entry in the x25CallParmTable that contains the default call parameters for this PLE." ::= { x25OperEntry 22 } x25OperLocalAddress OBJECT-TYPE SYNTAX X121Address ACCESS read-only STATUS mandatory DESCRIPTION "The local address for this PLE subnetwork. A zero length address maybe returned by PLEs that only support PVCs." REFERENCE "10733 5.9 localDTEAddress" ::= { x25OperEntry 23 } x25OperDataLinkId OBJECT-TYPE SYNTAX OBJECT IDENTIFIER ACCESS read-only STATUS mandatory DESCRIPTION "This identifies the instance of the index object in the first table of the most device specific MIB for the interface used by this PLE." ::= { x25OperEntry 24 } x25OperProtocolVersionSupported OBJECT-TYPE SYNTAX OBJECT IDENTIFIER ACCESS read-only STATUS mandatory DESCRIPTION "Identifies the version of the X.25 protocol this interface supports. Object identifiers for common versions are defined below in the x25ProtocolVersion subtree." REFERENCE "10733 5.9 protocolVersionSupported" ::= { x25OperEntry 25 } -- MIB-II also provides: -- ifDescr: -- On an X.25 interface this must include sufficient Throop [Page 22]
RFC 1382 X.25 Packet Layer MIB November 1992 -- information to enable the system's administrator -- to determine the appropriate configuration -- information on a system having multiple X.25 -- subnetworks. -- ifType: ddn-x25 or rfc877-x25 -- an interface of type ddn-x25 will use an algorithm to -- translate between X.121 address and IP addresses. -- An interface of type rfc877-x25 will use a -- configuration table to translate between X.121 -- addresses and IP addresses. -- ifMtu: the maximum PDU a higher layer can pass to X.25 or -- receive from X.25 -- ifSpeed: -- This will be the value of the local clock for this line. -- A value of zero indicates external clocking. -- ifAdminStatus: -- ifOperStatus -- ifLastChange -- ########################################################### -- X.25 Statistics Table -- ########################################################### x25StatTable OBJECT-TYPE SYNTAX SEQUENCE OF X25StatEntry ACCESS not-accessible STATUS mandatory DESCRIPTION "Statistics information about this X.25 PLE." ::= { x25 3 } x25StatEntry OBJECT-TYPE SYNTAX X25StatEntry ACCESS not-accessible STATUS mandatory DESCRIPTION "Entries of the x25StatTable." INDEX { x25StatIndex } ::= { x25StatTable 1 } Throop [Page 23]
RFC 1382 X.25 Packet Layer MIB November 1992 X25StatEntry ::= SEQUENCE { x25StatIndex IfIndexType, x25StatInCalls Counter, x25StatInCallRefusals Counter, x25StatInProviderInitiatedClears Counter, x25StatInRemotelyInitiatedResets Counter, x25StatInProviderInitiatedResets Counter, x25StatInRestarts Counter, x25StatInDataPackets Counter, x25StatInAccusedOfProtocolErrors Counter, x25StatInInterrupts Counter, x25StatOutCallAttempts Counter, x25StatOutCallFailures Counter, x25StatOutInterrupts Counter, x25StatOutDataPackets Counter, x25StatOutgoingCircuits Gauge, x25StatIncomingCircuits Gauge, x25StatTwowayCircuits Gauge, x25StatRestartTimeouts Counter, x25StatCallTimeouts Counter, x25StatResetTimeouts Counter, x25StatClearTimeouts Counter, x25StatDataRxmtTimeouts Counter, x25StatInterruptTimeouts Counter, x25StatRetryCountExceededs Throop [Page 24]
RFC 1382 X.25 Packet Layer MIB November 1992 Counter, x25StatClearCountExceededs Counter } x25StatIndex OBJECT-TYPE SYNTAX IfIndexType ACCESS read-only STATUS mandatory DESCRIPTION "The ifIndex value for the X.25 interface." ::= { x25StatEntry 1 } x25StatInCalls OBJECT-TYPE SYNTAX Counter ACCESS read-only STATUS mandatory DESCRIPTION "The number of incoming calls received." ::= { x25StatEntry 2 } x25StatInCallRefusals OBJECT-TYPE SYNTAX Counter ACCESS read-only STATUS mandatory DESCRIPTION "The number of incoming calls refused. This includes calls refused by the PLE and by higher layers. This also includes calls cleared because of restricted fast select." ::= { x25StatEntry 3 } x25StatInProviderInitiatedClears OBJECT-TYPE SYNTAX Counter ACCESS read-only STATUS mandatory DESCRIPTION "The number of clear requests with a cause code other than DTE initiated." REFERENCE "10733 providerInitiatedDisconnect" ::= { x25StatEntry 4 } x25StatInRemotelyInitiatedResets OBJECT-TYPE SYNTAX Counter ACCESS read-only STATUS mandatory DESCRIPTION "The number of reset requests received with Throop [Page 25]
RFC 1382 X.25 Packet Layer MIB November 1992
RFC 1382 X.25 Packet Layer MIB November 1992 All reference comments were changed to reference fields. The type PositiveInteger was imported from the RFC1381- MIB and used for all index and timer values. The x25PleTable was split into the x25AdmnTable, x25OperTable, and x25StatTable. The timer and counter objects from the x25CircuitTable were moved to the x25AdmnTable and replicated in the x25OperTable The objects in the x25CircuitTable were reordered to put the non-integer objects at the end of the table for easier implementation. The called and calling extension character set was extended to include a-f, and A-F. Additional states were added to the x25CircuitStatus object. Additional values were added to x25CircuitDirection x25CircuitCallParamId, and the addresses in the Circuit Table for PVCs. The length of the X25Address was changed to 0..15. The objects x25ClearedCircuitTimeEstablished, x25ClearedCircuitInPdus, and x25ClearedCircuitOutPdus were added to the x25ClearedCircuitTable. The name of the x25CircuitName was changed to x25CircuitDescr and the description was expanded. The access of the x25CircuitCallParamId was changed to read-only. The x25ClearedCircuitCodes object was split into the x25ClearedCircuitClearingCause and x25ClearedCircuitDiagnosticCode objects. The semantics of the x25ClearedCircuitIndex was redefined. Some of the description clauses were changed in an attempt to add clarity. Throop [Page 64]
RFC 1382 X.25 Packet Layer MIB November 1992 DEFVAL clauses were added to most objects in the x25CallParmTable. Additional text was added to the description section to provide an overview of the tables of the MIB. The minimum allowable value for maximum active circuits was changed from one to zero. February 1992 The February release (Editor's Internal Reference Number 1.14) made many changes. Many of the tables were combined. For example, the x25InfoTable, x25PktStatTable, and x25TmrStatTable were combined into the x25PleTable. The x25ConInfoTable, x25ConStatTable, and x25ConTimrTable were combined into the x25CircuitTable. The objects for call parameters were drastically reworked. All call parameters were combined in the x25CallParmTable. Any table, such as the x25PleTable or x25CircuitTable, that needs to reference call parameters identifies an entry in the new table. As part of this the x25ConDefTable was deleted and replaced with the x25PleDefCallParamId. The x25PvcTable was deleted; the x25CircuitStatus object provides similar information about PVCs. The x25ClearedCircuitTable was added to record the status code of cleared circuits. Many object definitions were restructured. For example, the time units for timers was changed from 1/100ths of a second to milliseconds. Some indexes into tables were replaced with object identifiers. Much of the introductory text was changed and the references were changed to match. October 1991 The October release (Editor Internal Reference Number 1.10) made the following changes: Changed x25ConInfoStatus to clarify the description and Throop [Page 65]
RFC 1382 X.25 Packet Layer MIB November 1992 the pvcResetting(5) value was changed to pvcResetting(6) to avoid a conflict with a previous use of the number 5. The name of the counter object x25TmrStatRetryCountsExceeded was changed to x25TmrStatRetryCountExceededs. The name of the counter object x25TmrStatClearCountsExceeded was changed to x25TmrStatClearCountExceededs. All occurrence of Guage was changed to Gauge. Added the x25CallFcltyTable, x25CallFcltyCcittTable, and x25CallParamTable. June 1991 The June release corrected some syntax errors and cleaned up some other minor things. April 1991 The April 26 release of this document was the first release. That version was derived from the ISO work on network layer management as presented in ISO/IEC 10733 [11] 6. Acknowledgements This document was produced by the x25mib working group: Fred Baker, ACC Art Berggreen, ACC Frank Bieser Gary Bjerke, Tandem Bill Bowman, HP Christopher Bucci, Datability Charles Carvalho, ACC Jeff Case, Snmp Research Angela Chen, HP Carson Cheung, BNR Tom Daniel, Spider Systems Chuck Davin, MIT Billy Durham, Honeywell Richard Fox, Synoptics Doug Geller, Data General Herve Goguely, LIR Corp Andy Goldthorpe, british-telecom Throop [Page 66]
RFC 1382 X.25 Packet Layer MIB November 1992 Walter D. Guilarte David Gurevich Steve Huston, Process Software Corporation Jon Infante, ICL Frank Kastenholz, Clearpoint Zbigniew Kielczewski, Eicon Cheryl Krupezak, Georgia Tech Mats Lindstrom, Diab Data AB Andrew Malis, BBN Evan McGinnis, 3Com Gary (G.P.)Mussar, BNR Chandy Nilakantan, 3Com Randy Pafford, Data General Ragnar Paulson, The Software Group Limited Dave Perkins, Synoptics Walter Pinkarschewsky, DEC Karen Quidley, Data General Chris Ranch, Novell Paul S. Rarey, DHL Systems Inc. Jim Roche, Newbridge Research Philippe Roger, LIR Corp. Timon Sloane Mike Shand, DEC Brad Steina, Microcom Bob Stewart, Xyplex Tom Sullivan, Data General Rodney Thayer, Sable Technology Corporation Mark Therieau, Microcom Jane Thorn, Data General Dean Throop, Data General Maurice Turcotte, Racal Datacom Mike Zendels, Data General In addition, the contributions of the following individuals are also acknowledged: John Harper, DEC Chairman of the ISO committee for Network Level Management Information 7. References [1] Rose M., and K. McCloghrie, "Structure and Identification of Management Information for TCP/IP-based internets", STD 16, RFC 1155, Performance Systems International, Hughes LAN Systems, May 1990 [2] McCloghrie K., and M. Rose, "Management Information Base for Throop [Page 67]
RFC 1382 X.25 Packet Layer MIB November 1992 Network Management of TCP/IP-based internets", RFC 1156, Hughes LAN Systems, Performance Systems International, May 1990. [3] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple Network Management Protocol", STD 15, RFC 1157, SNMP Research, Performance Systems International, Performance Systems International, MIT Laboratory for Computer Science, May 1990. [4] Rose, M., and K. McCloghrie, Editors, "Concise MIB Definitions", STD 16, RFC 1212, Performance Systems International, Hughes LAN Systems, March 1991. [5] Rose M., Editor, "Management Information Base for Network Management of TCP/IP-based internets: MIB-II", STD 17, RFC 1213, Performance Systems International, March 1991. [6] Information processing systems - Open Systems Interconnection - Specification of Abstract Syntax Notation One (ASN.1), International Organization for Standardization, International Standard 8824, December 1987. [7] Information processing systems - Open Systems Interconnection - Specification of Basic Encoding Rules for Abstract Notation One (ASN.1), International Organization for Standardization, International Standard 8825, December 1987. [8] Stewart, B., Editor, "Definitions of Managed Objects for RS-232- like Hardware Devices", RFC 1317, Xyplex, Inc., April 1992. [9] Throop, D., Editor, "SNMP MIB extension for LAPB", RFC 1381, Data General Corporation, November 1992. [10] "Information technology - - Data communication - X.25 Packet layer Protocol for Data Terminal Equipment", International Organization for Standardization, International Standard 8208, March 1990. [11] "Information Technology - Telecommunications and information exchange between systems - Elements of Management Information Related to OSI network Layer Standards", Committee Draft International Standard 10733, November 1990. 8. Security Considerations Security issues are not discussed in this memo. Throop [Page 68]
RFC 1382 X.25 Packet Layer MIB November 1992 9. Authors' Addresses Dean D. Throop Data General Corporation 62 Alexander Dr. Research Triangle Park, NC 27709 Phone: (919)248-8421 EMail: throop@dg-rtp.dg.com



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