Tech-invite3GPPspaceIETF RFCsSIP
93929190898887868584838281807978777675747372717069686766656463626160595857565554535251504948474645444342414039383736353433323130292827262524232221201918171615141312111009080706050403020100
in Index   Prev   Next

RFC 3728

Definitions of Managed Objects for Very High Speed Digital Subscriber Lines (VDSL)

Pages: 76
Proposed Standard
Errata
Part 1 of 4 – Pages 1 to 11
None   None   Next

Top   ToC   RFC3728 - Page 1
Network Working Group                                             B. Ray
Request for Comments: 3728                        PESA Switching Systems
Category: Standards Track                                        R. Abbi
                                                                 Alcatel
                                                           February 2004


              Definitions of Managed Objects for Very High
                 Speed Digital Subscriber Lines (VDSL)

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 (2004).  All Rights Reserved.

Abstract

This document defines a Management Information Base (MIB) module for use with network management protocols in the Internet community. In particular, it describes objects used for managing Very High Speed Digital Subscriber Line (VDSL) interfaces.

Table of Contents

1. The Internet-Standard Management Framework . . . . . . . . . . 2 2. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.1. Relationship of the VDSL Line MIB Module to other MIB Modules. . . . . . . . . . . . . . . . . . . . . . . . . 2 2.2. Conventions used in the MIB Module . . . . . . . . . . . 4 2.3. Structure. . . . . . . . . . . . . . . . . . . . . . . . 5 2.4. Counters, Interval Buckets and Thresholds. . . . . . . . 7 2.5. Profiles . . . . . . . . . . . . . . . . . . . . . . . . 8 2.6. Notifications. . . . . . . . . . . . . . . . . . . . . . 9 2.7. Persistence. . . . . . . . . . . . . . . . . . . . . . . 10 3. Conformance and Compliance . . . . . . . . . . . . . . . . . . 11 4. Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . 11 5. Security Considerations. . . . . . . . . . . . . . . . . . . . 71 6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 72 6.1. Normative References . . . . . . . . . . . . . . . . . . 72 6.2. Informative References . . . . . . . . . . . . . . . . . 74 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 74
Top   ToC   RFC3728 - Page 2
   8.  Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 75
   9.  Full Copyright Statement . . . . . . . . . . . . . . . . . . . 76

1. The Internet-Standard Management Framework

For a detailed overview of the documents that describe the current Internet-Standard Management Framework, please refer to section 7 of RFC 3410 [RFC3410]. Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. MIB objects are generally accessed through the Simple Network Management Protocol (SNMP). Objects in the MIB are defined using the mechanisms defined in the Structure of Management Information (SMI). This memo specifies a MIB module that is compliant to the SMIv2, which is described in STD 58, RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580 [RFC2580]. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].

2. Overview

This document describes an SNMP MIB module for managing VDSL Lines. These definitions are based upon the specifications for VDSL as defined in T1E1, ETSI, and ITU documentation [T1E1311, T1E1011, T1E1013, ETSI2701, ETSI2702, ITU9931, ITU9971]. The MIB module is located in the MIB tree under MIB 2 transmission, as discussed in the MIB-2 Integration (RFC 2863 [RFC2863]) section of this document.

2.1. Relationship of the VDSL Line MIB Module to other MIB Modules

This section outlines the relationship of this MIB with other MIBs described in RFCs. Specifically, IF-MIB as presented in RFC 2863 [RFC2863] is discussed.

2.1.1. General IF-MIB Integration (RFC 2863)

The VDSL Line MIB specifies the detailed attributes of a data interface. As such, it needs to integrate with RFC 2863 [RFC2863]. The IANA has assigned the following ifType to VDSL:
Top   ToC   RFC3728 - Page 3
   IANAifType ::= TEXTUAL-CONVENTION
       ...

   SYNTAX INTEGER {
       ...
       vdsl(97), -- Very H-speed Digital Subscrib.  Loop
       ...
       }

   Additionally, a VDSL line may contain an optional fast channel and an
   optional interleaved channel which also integrate into RFC 2863
   [RFC2863].  The IANA has assigned the following ifTypes to these
   channels:

   IANAifType ::= TEXTUAL-CONVENTION
       ...
   SYNTAX INTEGER {
       ...
       interleave (124), -- Interleave channel
       fast (125),       -- Fast channel
       ...
       }

2.1.2. Usage of ifTable

The MIB branch identified by this ifType contains tables appropriate for this interface type. Most tables extend the ifEntry table, and are indexed by ifIndex. For interfaces in systems implementing this MIB, those table entries indexed by ifIndex MUST be persistent. The following attributes are part of the mandatory ifGeneral group in RFC 2863 [RFC2863], and are not duplicated in the VDSL Line MIB. =================================================================== ifIndex Interface index. ifDescr See interfaces MIB [RFC2863]. ifType vdsl(97), interleave(124), or fast(125) ifSpeed Set as appropriate. ifPhysAddress This object MUST have an octet string with zero length. ifAdminStatus See interfaces MIB [RFC2863].
Top   ToC   RFC3728 - Page 4
       ifOperStatus             See interfaces MIB [RFC2863].

       ifLastChange             See interfaces MIB [RFC2863].

       ifName                   See interfaces MIB [RFC2863].

       ifHighSpeed              Set as appropriate.

       ifConnectorPresent       Set as appropriate.

       ifLinkUpDownTrapEnable   Default to enabled(1).

   ===================================================================
                   Figure 1: Use of ifTable Objects

   Section 2.3, below, describes the structure of this MIB in relation
   to ifEntry in greater detail.

2.2. Conventions used in the MIB Module

2.2.1. Naming Conventions

A. Vtuc -- (VTUC) transceiver at near (Central) end of line B. Vtur -- (VTUR) transceiver at Remote end of line C. Vtu -- One of either Vtuc or Vtur D. Curr -- Current E. Prev -- Previous F. Atn -- Attenuation G. ES -- Errored Second H. SES -- Severely Errored Second I. UAS -- Unavailable Second J. LCS -- Line Code Specific K. Lof -- Loss of Frame L. Lol -- Loss of Link M. Los -- Loss of Signal N. Lpr -- Loss of Power O. xxxs -- Sum of Seconds in which xxx has occured (e.g., xxx = Lof, Los, Lpr, Lol) P. Max -- Maximum Q. Mgn -- Margin R. Min -- Minimum S. Psd -- Power Spectral Density T. Snr -- Signal to Noise Ratio U. Tx -- Transmit V. Blks -- Blocks
Top   ToC   RFC3728 - Page 5

2.2.2. Textual Conventions

The following textual conventions are defined to reflect the line topology in the MIB (further discussed in the following section) and to define the behavior of the statistics to be maintained by an agent. o VdslLineCodingType : Attributes with this syntax identify the line coding used. Specified as an INTEGER, the three values are: other(1) -- none of the following mcm(2) -- Multiple Carrier Modulation scm(3) -- Single Carrier Modulation o VdslLineEntity : Attributes with this syntax reference the two sides of a line. Specified as an INTEGER, the two values are: vtuc(1) -- central site transceiver vtur(2) -- remote site transceiver

2.3 Structure

The MIB is structured into the following MIB groups: o vdslGroup : This group supports all line code independent MIB objects found in this MIB. The following tables contain objects permitted for ifType vdsl(97): - vdslLineTable - vdslPhysTable - vdslPerfDataTable - vdslPerfIntervalTable - vdslPerf1DayIntervalTable - vdslLineConfProfileTable - vdslLineAlarmConfProfileTable
Top   ToC   RFC3728 - Page 6
   The following tables contain objects permitted for ifTypes
   interleave(124) and (fast):

      - vdslChanTable
      - vdslChanPerfDataTable
      - vdslChanPerfIntervalTable
      - vdslChanPerf1DayIntervalTable

   Figure 2, below, displays the relationship of the tables in the
   vdslGroup to ifEntry (and each other):

     ifEntry(ifType=97)  ---> vdslLineTableEntry 1:(0 to 1)

     vdslLineTableEntry  ---> vdslPhysTableEntry 1:(0 to 2)
                         ---> vdslPerfDataEntry 1:(0 to 2)
                         ---> vdslLineConfProfileEntry 1:(0 to 1)
                         ---> vdslLineAlarmConfProfileEntry 1:(0 to 1)

     vdslPhysTableEntry  ---> vdslPerfIntervalEntry 1:(0 to 96)
                         ---> vdslPerf1DayIntervalEntry 1:(0 to 30)

     ifEntry(ifType=124) ---> vdslChanEntry 1:(0 to 2)
                         ---> vdslChanPerfDataEntry 1:(0 to 2)

     ifEntry(ifType=125) ---> vdslChanEntry 1:(0 to 2)
                         ---> vdslChanPerfDataEntry 1:(0 to 2)

     vdslChanEntry       ---> vdslchanPerfIntervalEntry 1:(0 to 96)
                         ---> vdslchan1DayPerfIntervalEntry 1:(0 to 30)

                   Figure 2: Table Relationships

   o   vdslNotificationGroup :

   This group contains definitions of VDSL line notifications.  Section
   2.6, below, presents greater detail on the notifications defined
   within the MIB module.
Top   ToC   RFC3728 - Page 7

2.3.1. Line Topology

A VDSL Line consists of two units - a Vtuc (the central transceiver unit) and a Vtur (the remote transceiver unit). <-- Network Side Customer Side --> |<////////// VDSL Line ///////////>| +-------+ +-------+ | | | | | Vtuc +------------------+ Vtur | | | | | +-------+ +-------+ Figure 3: General topology for a VDSL Line

2.4. Counters, Interval Buckets and Thresholds

For Loss of Frame (lof), Loss of Link (lol), Loss of Signal (los), and Loss of Power (lpr), Errored Seconds (ES), Severely Errored Seconds (SES), and Unavailable Seconds (UAS) there are event counters, current 15-minute, 0 to 96 15-minute history bucket(s), and 0 to 30 1-day history bucket(s) of "interval-counters". Each current 15-minute event bucket has an associated threshold notification. Each of these counters uses the textual conventions defined in the HC-PerfHist-TC-MIB [RFC3705]. The HC-PerfHist-TC-MIB defines 64-bit versions of the textual conventions found in RFC 3593 [RFC3593]. There is no requirement for an agent to ensure a fixed relationship between the start of a fifteen minute interval and any wall clock; however, some implementations may align the fifteen minute intervals with quarter hours. Likewise, an implementation may choose to align one day intervals with the start of a day. Counters are not reset when a Vtu is reinitialized, only when the agent is reset or reinitialized (or under specific request outside the scope of this MIB module).
Top   ToC   RFC3728 - Page 8

2.5. Profiles

As a managed node can handle a large number of Vtus, (e.g., hundreds or perhaps thousands of lines), provisioning every parameter on every Vtu may become burdensome. Moreover, most lines are provisioned identically with the same set of parameters. To simplify the provisioning process, this MIB makes use of profiles. A profile is a set of parameters that can be shared by multiple lines using the same configuration. The following profiles are used in this MIB module: o Line Configuration Profiles - Line configuration profiles contain parameters for configuring VDSL lines. They are defined in the vdslLineConfProfileTable. o Alarm Configuration Profiles - These profiles contain parameters for configuring alarm thresholds for VDSL transceivers. These profiles are defined in the vdslLineAlarmConfProfileTable. One or more lines may be configured to share parameters of a single profile by setting their vdslLineConfProfile objects to the value of this profile. If a change is made to the profile, all lines that refer to it will be reconfigured to the changed parameters. Before a profile can be deleted or taken out of service it must be first unreferenced from all associated lines. Implementations MUST provide a default profile with an index value of 'DEFVAL' for each profile type. The values of the associated parameters will be vendor specific unless otherwise indicated in this document. Before a line's profiles have been set, these profiles will be automatically used by setting vdslLineConfProfile and vdslLineAlarmConfProfile to 'DEFVAL' where appropriate. This default profile name, 'DEFVAL', is considered reserved in the context of profiles defined in this MIB module. Profiles are created, assigned, and deleted dynamically using the profile name and profile row status in each of the ten profile tables (nine line configuration tables and one alarm configuration table). Profile changes MUST take effect immediately. These changes MAY result in a restart (hard reset or soft restart) of the units on the line.
Top   ToC   RFC3728 - Page 9

2.6. Notifications

The ability to generate the SNMP notifications coldStart/WarmStart (per [RFC3418]) which are per agent (e.g., per Digital Subscriber Line Access Multiplexer, or DSLAM, in such a device), and linkUp/linkDown (per [RFC2863]) which are per interface (i.e., VDSL line) is required. The notifications defined in this MIB are for initialization failure and for the threshold crossings associated with the following events: lof, lol, los, lpr, ES, SES, and UAS. Each threshold has its own enable/threshold value. When that value is 0, the notification is disabled. A linkDown notification MAY be generated whenever any of lof, lol, los, lpr, ES, SES, or UAS threshold crossing event (as defined in this MIB module) occurs. The corresponding linkUp notification MAY be sent when all link failure conditions are cleared. The vdslPhysCurrStatus is a bitmask representing all outstanding error conditions associated with a particular VDSL transceiver. Note that since status of remote transceivers is obtained via the EOC, this information may be unavailable for units that are unreachable via the EOC during a line error condition. Therefore, not all conditions may always be included in its current status. Notifications corresponding to the bit fields in this object are defined. A threshold notification occurs whenever the corresponding current 15-minute interval error counter becomes equal to, or exceeds the threshold value. One notification may be sent per interval per interface. Since the current 15-minute counters are reset to 0 every 15 minutes, if the condition persists, the notification may recur as often as every 15 minutes. For example, to get a notification whenever a "loss of" event occurs (but at most once every 15 minutes), set the corresponding threshold to 1. The agent will generate a notification when the event originally occurs. Note that the Network Management System, or NMS, may receive a linkDown notification, as well, if enabled (via ifLinkUpDownTrapEnable [RFC2863]). At the beginning of the next 15 minute interval, the counter is reset. When the first second goes by and the event occurs, the current interval bucket will be 1, which equals the threshold and the notification will be sent again.
Top   ToC   RFC3728 - Page 10

2.7. Persistence

All read-write and read-create objects defined in this MIB module SHOULD be stored persistently. Following is an exhaustive list of these persistent objects: - vdslLineConfProfile - vdslLineAlarmConfProfile - vdslLineConfProfileName - vdslLineConfDownRateMode - vdslLineConfUpRateMode - vdslLineConfDownMaxPwr - vdslLineConfUpMaxPwr - vdslLineConfDownMaxSnrMgn - vdslLineConfDownMinSnrMgn - vdslLineConfDownTargetSnrMgn - vdslLineConfUpMaxSnrMgn - vdslLineConfUpMinSnrMgn - vdslLineConfUpTargetSnrMgn - vdslLineConfDownFastMaxDataRate - vdslLineConfDownFastMinDataRate - vdslLineConfDownSlowMaxDataRate - vdslLineConfDownSlowMinDataRate - vdslLineConfUpFastMaxDataRate - vdslLineConfUpFastMinDataRate - vdslLineConfUpSlowMaxDataRate - vdslLineConfUpSlowMinDataRate - vdslLineConfDownRateRatio - vdslLineConfUpRateRatio - vdslLineConfDownMaxInterDelay - vdslLineConfUpMaxInterDelay - vdslLineConfDownPboControl - vdslLineConfUpPboControl - vdslLineConfDownPboLevel - vdslLineConfUpPboLevel - vdslLineConfDeploymentScenario - vdslLineConfAdslPresence - vdslLineConfApplicableStandard - vdslLineConfBandPlan - vdslLineConfBandPlanFx - vdslLineConfBandOptUsage - vdslLineConfUpPsdTemplate - vdslLineConfDownPsdTemplate - vdslLineConfHamBandMask - vdslLineConfCustomNotch1Start - vdslLineConfCustomNotch1Stop - vdslLineConfCustomNotch2Start - vdslLineConfCustomNotch2Stop
Top   ToC   RFC3728 - Page 11
      - vdslLineConfDownTargetSlowBurst
      - vdslLineConfUpTargetSlowBurst
      - vdslLineConfDownMaxFastFec
      - vdslLineConfUpMaxFastFec
      - vdslLineConfLineType
      - vdslLineConfProfRowStatus
      - vdslLineAlarmConfProfileName
      - vdslLineAlarmConfThresh15MinLofs
      - vdslLineAlarmConfThresh15MinLoss
      - vdslLineAlarmConfThresh15MinLprs
      - vdslLineAlarmConfThresh15MinLols
      - vdslLineAlarmConfThresh15MinESs
      - vdslLineAlarmConfThresh15MinSESs
      - vdslLineAlarmConfThresh15MinUASs
      - vdslLineAlarmConfInitFailure
      - vdslLineAlarmConfProfRowStatus

   It should also be noted that interface indices in this MIB are
   maintained persistently.  VACM data relating to these SHOULD be
   stored persistently as well [RFC3415].

3. Conformance and Compliance

For VDSL lines, the following groups are mandatory: - vdslGroup - vdslNotificationGroup


(page 11 continued on part 2)

Next Section