📄 rfc2558.txt
字号:
Network Working Group K. Tesink
Request for Comments: 2558 Telcordia Technologies
Obsoletes: 1595 March 1999
Category: Standards Track
Definitions of Managed Objects
for the SONET/SDH Interface Type
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.
1. Abstract
This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in TCP/IP-based internets.
In particular, it defines objects for managing Synchronous Optical
Network/Synchronous Digital Hierarchy (SONET/SDH) interfaces. This
document is a companion to the documents that define Managed Objects
for the DS1/E1/DS2/E2 and DS3/E3 Interface Types [24][25].
Textual Conventions used in this MIB are defined in [6] and [36].
This memo replaces RFC 1595 [30]. Changes relative to RFC 1595 are
summarized in the MIB module's REVISION clause.
Table of Contents
1 Abstract .............................................. 1
2 The SNMP Network Management Framework ................. 2
3 Overview .............................................. 3
3.1 Use of the ifTable .................................. 4
3.2 Use of ifTable for SONET/SDH Medium/Section/Line
Layer ............................................... 5
3.3 Use of ifTable for SONET/SDH Paths .................. 6
3.4 Use of ifTable for SONET/SDH VTs/VCs ................ 7
3.5 SONET/SDH Terminology ............................... 8
4 Object Definitions .................................... 16
4.1 The SONET/SDH Medium Group .......................... 19
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RFC 2558 SONET/SDH Objects March 1999
4.2 The SONET/SDH Section Group ......................... 23
4.2.1 The SONET/SDH Section Current Group ............... 23
4.2.2 The SONET/SDH Section Interval Group .............. 26
4.3 The SONET/SDH Line Group ............................ 28
4.3.1 The SONET/SDH Line Current Group .................. 28
4.3.2 The SONET/SDH Line Interval Group ................. 30
4.4 The SONET/SDH Far End Line Group .................... 32
4.4.1 The SONET/SDH Far End Line Current Group .......... 33
4.4.2 The SONET/SDH Far End Line Interval Group ......... 34
4.5 The SONET/SDH Path Group ............................ 37
4.5.1 The SONET/SDH Path Current Group .................. 37
4.5.2 The SONET/SDH Path Interval Group ................. 39
4.6 The SONET/SDH Far End Path Group .................... 42
4.6.1 The SONET/SDH Far End Path Current Group .......... 42
4.6.2 The SONET/SDH Far End Path Interval Group ......... 44
4.7 The SONET/SDH Virtual Tributary Group ............... 46
4.7.1 The SONET/SDH VT Current Group .................... 46
4.7.2 The SONET/SDH VT Interval Group ................... 49
4.8 The SONET/SDH Far End VT Group ...................... 51
4.8.1 The SONET/SDH Far End VT Current Group ............ 51
4.8.2 The SONET/SDH Far End VT Interval Group ........... 53
4.9 Conformance Information ............................. 55
4.10 Compliance Statements .............................. 56
5 Acknowledgments ....................................... 65
6 Security Considerations ............................... 65
7 References ............................................ 66
8 Author's Address ...................................... 69
9 Intellectual Property ................................. 69
Appendix A .............................................. 70
Appendix B .............................................. 72
Full Copyright Statement ................................ 74
2. The SNMP Network Management Framework
The SNMP Management Framework presently consists of five major
components:
0 An overall architecture, described in RFC 2271 [1].
0 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].
Tesink Standards Track [Page 2]
RFC 2558 SONET/SDH Objects March 1999
0 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 2272 [11] and
RFC 2274 [12].
0 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].
0 A set of fundamental applications described in RFC 2273 [14] and
the view-based access control mechanism described in RFC 2275
[15].
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 (e.g., 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.
3. Overview
These objects are used when the particular media being used to
realize an interface is a SONET/SDH interface. At present, this
applies to these values of the ifType variable in the Internet-
standard MIB:
sonet (39), sonetPath (50), sonetVT (51)
The definitions contained herein are based on the SONET/SDH
specifications in ANSI T1.105 and T1.106-1988 [19][20][21] and CCITT
G.707, 708, 709, and G.783 [26][27][28][29].
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RFC 2558 SONET/SDH Objects March 1999
3.1. Use of the ifTable
This section specifies how the MIB II interfaces group, as defined in
[23], is used for SONET/SDH interfaces. The SONET/SDH layers support
several multiplexing possibilities.
For example in SONET, an Synchronous Transport Signal 3 (STS-3) has 3
SONET Paths, and a STS-3c has 1 SONET Path. Another example could be
a STS-12 having 4 SONET STS-3c Paths. Similarly, a SONET Synchronous
Payload Envelope (SPE) can carry many Virtual Tributaries (VTs), for
example, one SONET SPE can carry 28 VT1.5s. It is important to note
that an SPE and a VT in SONET is collectively referred to as a
Virtual Container (VC) in SDH. Also, an STS is called Synchronous
Transport Module (STM) in SDH.
Not all SONET/SDH equipment terminates all SONET/SDH layers. For
example, a SONET/SDH STE regenerator terminates SONET/SDH Sections
only, and is transparent for all layers above that. SONET/SDH Add-
Drop multiplexers and Digital Cross Connect Systems terminate
SONET/SDH Lines. SONET/SDH Terminal Multiplexers may also terminate
SONET/SDH Paths and VTs/VCs.
MIB II [16], as extended by [23], accommodates these cases by
appropriate use of the MIB II system group, and the interfaces group.
The system group can name and describe the type of managed resource.
The interfaces group defines which SONET/SDH layers apply, how these
layers are configured and multiplexed. This is achieved by proper
representation of SONET/SDH Layers by ifEntries as defined in [23],
as follows:
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RFC 2558 SONET/SDH Objects March 1999
_____________________________
| | | | >
| | | | |
| VT 1 |..........|VT K| > K ifEntries
| | | | |
|_____________|__________|____| >
| | | | >
| | | | |
| Path 1 |......|Path L| > L ifEntries
| | | | |
|_______________|______|______| >
| | >
| | |
| Line | |
| | |
|_____________________________| |
| | |
| | |
| Section Layer | > 1 ifEntry
| | |
|_____________________________| |
| | |
| | |
| Physical Medium Layer | |
| | |
|_____________________________| >
Use of ifTable for a SONET/SDH port
The exact configuration and multiplexing of the layers is maintained
in the ifStackTable [23].
3.2. Use of ifTable for SONET/SDH Medium/Section/Line Layer
Only the ifGeneralInformationGroup needs to be supported.
ifTable Object Use for combined SONET/SDH
Medium/Section/Line Layer
======================================================================
ifIndex Interface index.
ifDescr SONET/SDH Medium/Section/Line
ifType sonet(39)
ifSpeed Speed of line rate for SONET/SDH,
(e.g., 155520000 bps).
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RFC 2558 SONET/SDH Objects March 1999
ifPhysAddress The value of the Circuit Identifier.
If no Circuit Identifier has been assigned
this object should have an octet string with
zero length.
ifAdminStatus Supports read-only access.
The desired administrative status of the
interface.
ifOperStatus The value testing(3) is not used.
This object assumes the value down(2),
if the objects sonetSectionCurrentStatus
and sonetLineCurrentStatus have
any other value than sonetSectionNoDefect(1)
and sonetLineNoDefect(1), respectively.
ifLastChange sysUpTime at the last change in ifOperStatus.
ifName Textual name of the interface or an OCTET STRING
of zero length.
ifLinkUpDownTrapEnable Default value is enabled(1).
Just read-only access may be supported.
ifHighSpeed Speed of line in Mega-bits per second
(e.g., 155 Mbps)
ifConnectorPresent Set to true(1).
ifAlias The (non-volatile) alias name for this interface
as assigned by the network manager.
3.3. Use of ifTable for SONET/SDH Paths
Only the ifGeneralInformationGroup needs to be supported.
ifTable Object Use for SONET/SDH Paths
=========================================
ifIndex Interface index.
ifDescr SONET/SDH Path
ifType sonetPath(50)
ifSpeed set to speed of SONET/SDH path
(e.g., an STS-1 path has a
rate of 50112000 bps.)
Tesink Standards Track [Page 6]
RFC 2558 SONET/SDH Objects March 1999
ifPhysAddress Circuit Identifier or OCTET STRING of zero length.
ifAdminStatus Supports read-only access.
The desired administrative status of the
interface.
ifOperStatus This object assumes the value down(2),
if the object sonetPathCurrentStatus has
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