📄 rfc2662.txt
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Network Working Group G. Bathrick
Request for Comments: 2662 AG Communication Systems
Category: Standards Track F. Ly
Copper Mountain Networks
August 1999
Definitions of Managed Objects for the ADSL Lines
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.
Table of Contents
1. Abstract .............................................. 1
2. The SNMP Network Management Framework ................. 2
3. Object Definitions ..................................... 3
4. Relationship of the ADSL LINE MIB with standard MIBs ... 3
5. Conventions used in the MIB ............................ 7
6. Conformance and Compliance ............................. 17
7. Definitions ............................................ 17
8. Acknowledgments ........................................ 110
9. References ............................................. 111
10. Security Considerations ................................ 113
11. Intellectual Property Notice ........................... 114
12. Authors' Addresses ..................................... 114
13. Full Copyright Statement ............................... 115
1. Abstract
This document defines a standard SNMP MIB for ADSL lines based on the
ADSL Forum standard data model [9]. The ADSL standard describes
ATU-C and ATU-R as two sides of the ADSL line. This MIB covers both
ATU-C and ATU-R agent's perspectives. Each instance defined in the
MIB represents a single ADSL line.
Bathrick & Ly Standards Track [Page 1]
RFC 2662 ADSL Line MIB August 1999
It should be noted that the ADSL Forum Network Management Working
Group provided input towards the content of this document. See the
Acknowledgement Section for a list of individuals who made this
document possible.
2. The SNMP Network Management Framework
The SNMP Management Framework presently consists of five major
components:
o An overall architecture, described in RFC 2571 [13].
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 [14], STD 16, RFC 1212 [15] and RFC 1215 [16]. The
second version, called SMIv2, is described in STD 58, RFC 2578
[1], STD 58, RFC 2579 [2] and STD 58, RFC 2580 [17].
o Message protocols for transferring management information. The
first version of the SNMP message protocol is called SNMPv1 and
described in STD 15, RFC 1157 [7]. A second version of the SNMP
message protocol, which is not an Internet standards track
protocol, is called SNMPv2c and described in RFC 1901 [18] and RFC
1906 [19]. The third version of the message protocol is called
SNMPv3 and described in RFC 1906 [19], RFC 2572 [20] and RFC 2574
[21].
o Protocol operations for accessing management information. The
first set of protocol operations and associated PDU formats is
described in STD 15, RFC 1157 [7]. A second set of protocol
operations and associated PDU formats is described in RFC 1905
[8].
o A set of fundamental applications described in RFC 2573 [22] and
the view-based access control mechanism described in RFC 2575
[23].
This document 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.
Bathrick & Ly Standards Track [Page 2]
RFC 2662 ADSL Line MIB August 1999
3. Object Definitions
Managed objects are accessed via a virtual information store, termed
the Management Information Base or MIB. Objects in the MIB are
defined using the extended subset of Abstract Syntax Notation One
(ASN.1) defined in the SMI. In particular, each object type is named
by an OBJECT IDENTIFIER, an administratively assigned name. The
object type together with an object instance serves to uniquely
identify a specific instantiation of the object. For human
convenience, we often use a textual string, termed the descriptor, to
also refer to the object type.
4. Relationship of the ADSL LINE MIB with standard MIBs
This section outlines the relationship of ADSL Line MIB with other
MIBs described in RFCs and in their various degrees of
"standardization".
4.1 Use of the IfTable
The ADSL LINE MIB specifies the detailed attributes of a data
interface. As such, it needs to integrate with IF-MIB [5]. The IANA
has assigned the following ifType(s) relative to ADSL:
IANAifType ::= TEXTUAL-CONVENTION
. . .
SYNTAX INTEGER {
. . .
adsl(94), -- Asymmetric Digital Subscriber Loop
. . .
adslInterleave(124), -- ADSL Interleaved Channel
adslFast(125), -- ADSL Fast Channel
. . . }
Interfaces of each of these types are modeled by this document. Most
MIB tables in this document represent information of one of these
interface types and are indexed by ifIndex. Remaining are `profile'
tables which may be accessed by the profileIndex. This is explained
in more detail in section 5.4 Profiles.
Bathrick & Ly Standards Track [Page 3]
RFC 2662 ADSL Line MIB August 1999
4.1.1 ADSL Interface Types
As shown below, three ADSL interface types are defined in this
document, namely physical, interleaved channel, and fast channel.
The physical interface represents characteristics of the physical
media associated with both the ATUC and ATUR. The interleaved and
fast channel interface represent the characteristics of the two types
of ADSL channels.
For each ADSL Line, a physical interface always exists. Depending
on which ADSL operational configuration is present (as listed in
Figure 5), the channel interfaces (fast or interleaved) may or may
not exist.
______ ______
| |____________________| |
| ATUC | | ATUR |
| |____________________| |
|______| |______|
| <----- physical --------> |
| <--- fast channel ------> |
| <- interleaved channel -> |
Figure 1: ADSL Model
4.1.2 Use of IF-MIB (Interface MIB RFC 2233) [5]
The following attributes are part of the required
ifGeneralInformationGroup object group specified in RFC 2233 [5], and
are not duplicated in the ADSL MIB. Keep in mind that these objects
apply to the agent's view of the line.
Bathrick & Ly Standards Track [Page 4]
RFC 2662 ADSL Line MIB August 1999
ifTable Object Use for ADSL
==================================================================
ifIndex Interface index.
ifDescr See interfaces MIB [5]
ifType physical - adsl(94)
fast - adslFast(125)
interleaved - adslInterleave(124)
ifSpeed Transmit rate from the perspective
of the agent.
physical - line rate
fast - channel rate
interleaved - channel rate
ifPhysAddress This object should have an octet string
with zero length.
ifAdminStatus See interfaces MIB [5]
ifOperStatus See interfaces MIB [5]
Supplemented by adslAturCurrStatus and
adslAturCurrStatus
ifLastChange See interfaces MIB [5]
ifName See interfaces MIB [5]
ifLinkUpDownTrapEnable See interfaces MIB [5]
Default set as follows:
physical - enabled(1)
fast - disabled(2)
interleaved - disabled(2)
ifHighSpeed Speed of line in Mega-bits per second
(ifSpeed/1,000,000)
ifConnectorPresent See interfaces MIB [5]
Default set as follows:
physical - true(1)
fast - false(2)
Bathrick & Ly Standards Track [Page 5]
RFC 2662 ADSL Line MIB August 1999
interleaved - false(2)
ifAlias See interfaces MIB [5]
ifTableLastChange See interfaces MIB [5]
==================================================================
Figure 2: Use of ifTable Objects: ifGeneralInformationGroup
Use of the ifStackTable to associate the entries for physical, fast,
interleaved channels, and higher layers (e.g., ATM) is shown below in
figure 3. Use of ifStackTable is necessary, because configuration
information is stored in profile tables associated with the
physical-layer ifEntry only. The channels' ifEntrys need the
ifStackTable to find their associated physical-layer entry and thus
their configuration parameters. (See Profile section, 5.4).
______ (ifEntry=j) ______
| | fast channel | |
| |________________________| |
| | and/or | |
| | | |
| | (ifEntry=k) | |
| | interleaved channel | |
| |________________________| |
| ATUC | | ATUR |
| | | |
| | (ifEntry=i) | |
| | physical | |
| |________________________| |
|______| |______|
Figure 3: Use of ifStackTable (part 1)
The ifStackTable is then used to show the relationships between the
various ADSL interfaces, as illustrated below in figure 4.
HigherLayer LowerLayer
--------------------------
j i
k i
Figure 4: Use of ifStackTable (part 2)
The ifRcvAddressTable is not applicable for ADSL interfaces.
Bathrick & Ly Standards Track [Page 6]
RFC 2662 ADSL Line MIB August 1999
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