The Interfaces Group MIB using SMIv2
RFC 2233

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Network Working Group                                      K. McCloghrie
Request for Comments: 2233                                 Cisco Systems
Obsoletes: 1573                                            F. Kastenholz
Category: Standards Track                                   FTP Software
                                                           November 1997

                  The Interfaces Group MIB using SMIv2

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 (1997).  All Rights Reserved.

Table of Contents

   1 Introduction ..............................................    2
   2 The SNMP Network Management Framework .....................    2
   2.1 Object Definitions ......................................    3
   3 Experience with the Interfaces Group ......................    3
   3.1 Clarifications/Revisions ................................    3
   3.1.1 Interface Sub-Layers ..................................    4
   3.1.2 Guidance on Defining Sub-layers .......................    6
   3.1.3 Virtual Circuits ......................................    8
   3.1.4 Bit, Character, and Fixed-Length Interfaces ...........    8
   3.1.5 Interface Numbering ...................................   10
   3.1.6 Counter Size ..........................................   14
   3.1.7 Interface Speed .......................................   16
   3.1.8 Multicast/Broadcast Counters ..........................   17
   3.1.9 Trap Enable ...........................................   18
   3.1.10 Addition of New ifType values ........................   18
   3.1.11 InterfaceIndex Textual Convention ....................   18
   3.1.12 New states for IfOperStatus ..........................   19
   3.1.13 IfAdminStatus and IfOperStatus .......................   20
   3.1.14 IfOperStatus in an Interface Stack ...................   21
   3.1.15 Traps ................................................   21
   3.1.16 ifSpecific ...........................................   23
   3.1.17 Creation/Deletion of Interfaces ......................   24
   3.1.18 All Values Must be Known .............................   24
   4 Media-Specific MIB Applicability ..........................   25

McCloghrie & Kastenholz     Standards Track                     [Page 1]
RFC 2233            Interfaces Group MIB using SMIv2       November 1997

   5 Overview ..................................................   26
   6 Interfaces Group Definitions ..............................   26
   7 Acknowledgements ..........................................   64
   8 References ................................................   64
   9 Security Considerations ...................................   65
   10 Authors' Addresses .......................................   65
   11 Full Copyright Statement .................................   66

1.  Introduction

   This memo defines a portion of the Management Information Base
   (MIB) for use with network management protocols in the Internet
   community.  In particular, it describes managed objects used for
   managing Network Interfaces.

   This memo discusses the 'interfaces' group of MIB-II, especially the
   experience gained from the definition of numerous media- specific MIB
   modules for use in conjunction with the 'interfaces' group for
   managing various sub-layers beneath the internetwork- layer.  It
   specifies clarifications to, and extensions of, the architectural
   issues within the previous model used for the 'interfaces' group.

   This memo also includes a MIB module.  As well as including new
   MIB definitions to support the architectural extensions, this MIB
   module also re-specifies the 'interfaces' group of MIB-II in a
   manner that is both compliant to the SNMPv2 SMI and semantically-
   identical to the existing SNMPv1-based definitions.

   The key words "MUST" and "MUST NOT" in this document are to be
   interpreted as described in RFC 2119 [10].

2.  The SNMP Network Management Framework

   The SNMP Network Management Framework presently consists of three
   major components.  They are:

   o    RFC 1902 which defines the SMI, the mechanisms used for
        describing and naming objects for the purpose of management.

   o    STD 17, RFC 1213 defines MIB-II, the core set of managed
        objects for the Internet suite of protocols.

   o    STD 15, RFC 1157 and RFC 1905 which define two versions of
        the protocol used for network access to managed objects.

McCloghrie & Kastenholz     Standards Track                     [Page 2]
RFC 2233            Interfaces Group MIB using SMIv2       November 1997