Definitions of Managed Objects for the DS1, E1, DS2 and E2 Interface Types
RFC 2495

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Network Working Group                              D. Fowler, Editor
Request for Comments: 2495                        Newbridge Networks
Obsoletes: 1406                                         January 1999
Category: Standards Track

                     Definitions of Managed Objects
              for the DS1, E1, DS2 and E2 Interface Types

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 (C) The Internet Society (1999).  All Rights Reserved.

Abstract

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in the Internet community.
   In particular, it describes objects used for managing DS1, E1, DS2
   and E2 interfaces.  This document is a companion document with
   Definitions of Managed Objects for the DS0 (RFC 2494 [30]), DS3/E3
   (RFC 2496 [28]), and the work in progress, SONET/SDH Interface Types.

   This memo specifies a MIB module in a manner that is both compliant
   to the SNMPv2 SMI, and semantically identical to the peer SNMPv1
   definitions.

Table of Contents

   1 The SNMP Management Framework ................................    2
   1.1 Changes from RFC1406 .......................................    3
   2 Overview .....................................................    4
   2.1 Use of ifTable for DS1 Layer ...............................    5
   2.2 Usage Guidelines ...........................................    6
   2.2.1 Usage of ifStackTable for Routers and DSUs ...............    6
   2.2.2 Usage of ifStackTable for DS1/E1 on DS2/E2 ...............    8
   2.2.3 Usage of Channelization for DS3, DS1, DS0 ................    9
   2.2.4 Usage of Channelization for DS3, DS2, DS1 ................    9
   2.2.5 Usage of Loopbacks .......................................   10
   2.3 Objectives of this MIB Module ..............................   11
   2.4 DS1 Terminology ............................................   11

Fowler, Ed.                 Standards Track                     [Page 1]
RFC 2495                   DS1/E1/DS2/E2 MIB                January 1999

   2.4.1 Error Events .............................................   12
   2.4.2 Performance Defects ......................................   12
   2.4.3 Performance Parameters ...................................   14
   2.4.4 Failure States ...........................................   17
   2.4.5 Other Terms ..............................................   21
   3 Object Definitions ...........................................   21
   3.1 The DS1 Near End Group .....................................   22
   3.1.1 The DS1 Configuration Table ..............................   22
   3.1.2 The DS1 Current Table ....................................   33
   3.1.3 The DS1 Interval Table ...................................   36
   3.1.4 The DS1 Total Table ......................................   39
   3.1.5 The DS1 Channel Table ....................................   42
   3.2 The DS1 Far End Group ......................................   43
   3.2.1 The DS1 Far End Current Table ............................   43
   3.2.2 The DS1 Far End Interval Table ...........................   47
   3.2.3 The DS1 Far End Total Table ..............................   50
   3.3 The DS1 Fractional Table ...................................   53
   3.4 The DS1 Trap Group .........................................   55
   3.5 Conformance Groups .........................................   61
   4 Appendix A - Use of dsx1IfIndex and dsx1LineIndex ............   66
   5 Appendix B - The delay approach to Unavialable Seconds.  .....   69
   6 Intellectual Property ........................................   70
   7 Acknowledgments ..............................................   70
   8 References ...................................................   71
   9 Security Considerations ......................................   73
   10 Author's Address ............................................   74
   11 Full Copyright Statement ....................................   75

1.  The SNMP Management Framework

   The SNMP Management Framework presently consists of five major
   components:

    o   An overall architecture, described in RFC 2271 [1].

    o   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 RFC 1902 [5], RFC
        1903 [6] and RFC 1904 [7].

    o   Message protocols for transferring management information. The