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91nov
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area.netmanagement.91nov.txt
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Network Management Area
Director(s):
o James Davin: jrd@ptt.lcs.mit.edu
Area Summary reported by James Davin/MIT
At the Santa Fe meeting of the IETF, six working groups of the Network
Management Area held one or more sessions throughout the week. Also,
two Birds of a Feather sessions were held.
The SNMP Network Management Directorate reviewed six MIB specifications
that had been recently reported out of working groups. Three of these
were products of the Character MIB Working Group: the MIB for character
stream devices, the MIB for parallel-printer-like hardware devices, the
MIB for RS232-like devices. Also reviewed were the IP Forwarding MIB
produced by the Router Requirements Working Group, the Frame Relay MIB
produced by the IPLPDN Working Group, and the SMDS Interface Protocol
MIB produced by the SNMP Working Group. The IESG announced its
intention to consider these MIBs as candidates for Proposed Standard
status after final text is available in the Internet-Drafts repository.
In addition, the Directorate discussed the problem of representing
elaborate protocol stacks using the abstractions provided by the
``interfaces'' Group of MIB 2. The Directorate discussion was premised
on the notion that is implicit in MIB 2 that an ``interface'' object is
only used to represent protocol entities below the internetwork (e.g.,
IP) layer. The problem addressed has arisen in any number of Working
Group discussions: although the interfaces Group in MIB 2 is a
convenient abstraction for managers, it doesn't support specific
transmission media or elaborate protocol stacks that may involve both
downward and upward multiplexing.
The Directorate discussion came to three conclusions:
1. Every entry in a media-specific MIB table is paired one-to-one with
a single entry in the interfaces table of MIB 2. The
media-specific entry can be reached from the generic interfaces
table entry by using information in the ifType object together with
information in the ifIndex object.
2. Media-specific MIB table entries can (and often do) include
``pointer'' information that represents user-service relations
among entities in a more or less elaborate protocol stack below the
internetwork layer. This pointer information variously takes the
form of OBJECT IDENTIFIER values (as in the Character MIB) or
combinations of OBJECT IDENTIFIER and INTEGER values.
3. If every protocol entity below the internetwork layer is
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represented by an entry in the MIB 2 interfaces table, then all
possible user-service relations among such entities may be
concisely represented as a set of ordered pairs of ifIndex values.
A simple MIB to represent such a set of ordered pairs was deemed
desirable.
A document presenting these conclusions in greater detail will be
prepared as a basis for broader discussion of this problem.
X.25 Management Information Base (x25mib)
The Working Group met to consider three documents: one that instruments
X.25 link-layer functionality, one that instruments X.25 layer 3
functionality, and one that instruments convergence functions necessary
to run IP over X.25.
At this meeting, the Working Group decided that the scope of
instrumentation in the link-layer MIB will be confined to the LAPB
protocol. The Working Group also concluded that the objects in these
MIBs should be reviewed for actual usefulness in managing networks and
that some pruning or alteration in conformance posture may be desirable.
The Working Group noted that the IPLPDN Working Group was contemplating
a revision to RFC 877 and decided to monitor that activity to determine
if it may warrant revision to the IP/X.25 convergence MIB. The Group
also discussed at some length the problems of representing X.25 protocol
stacks in MIBs and suggested that the SNMP Directorate might pay some
attention to this problem.
Remote LAN Monitoring (rmonmib)
This Working Group met informally to discuss implementation experience
with the recently published RMON MIB. At the suggestion of members who
had attended the Birds of a Feather session on SNMP Device Discovery
earlier in the week, the Working Group spent some time discussing ways
in which RMON technology could be applied to the device discovery
problem. The meeting also recommended that a new working group be
formed to address extensions of the RMON MIB for Token Ring media.
IEEE 802.3 Hub MIB (hubmib)
This Working Group met to discuss the current draft of an SNMP MIB for
802.3 Repeater devices. The Chair reported on IEEE reaction to this
first draft of the SNMP MIB. A presentation was made on ideas for a
``Chassis MIB'' that is useful in instrumenting communications products
that encompass multiple devices. As a result of this presentation, the
Working Group concluded that its repeater MIB need not accommodate
multiple repeater devices as this need was better addressed by the
notion of a Chassis MIB. The Working Group recommended that effort be
applied to development of the Chassis MIB ideas.
Internet Accounting (acct)
This Working Group met in two sessions during the Santa Fe IETF meeting.
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The first session reviewed the Internet Accounting Background document
(RFC 1272). Some time was spent bringing newcomers up to date with the
Working Group's purpose and efforts. New attendees brought fresh
perspectives and offered many comments, criticisms, and suggestions that
will be incorporated into either a new version of the RFC or into
follow-on documents.
The second session was spent in discussion of the latest draft of the
Internet Accounting Architecture. Although this document has existed
for several months now and has undergone three or four extensive
revisions, it still needs work, both in form and content. The stated
scope of the document was tightened. The Internet Accounting model and
its difference from the OSI accounting model was more clearly defined.
A decision was made to combine the metering services document (formerly
to be separate) with the architecture document. A decision was made to
announce the Working Group's intention to produce a draft MIB document
before its work is concluded. Discussion of the architecture document
will continue with a view to advancing it to the status of Internet
Draft by the next IETF conference.
Simple Network Management Protocol (snmp)
This Working Group met briefly in Santa Fe to conclude its business.
The only item of outstanding business was the resolution of issues
surrounding the Ethernet MIB. The Working Group Chair reviewed the
course of action that had been previously discussed on the mailing list.
With the formation of the Ethernet MIB Working Group to resolve
outstanding issues, the SNMP Working Group adjourned and disbanded. The
scheduled time that remained after adjournment of the SNMP Working Group
was devoted to the first meeting of the new Ethernet MIB Group.
Ethernet MIB (ethermib)
The Ethernet MIB Working Group met for the first time in Santa Fe to
begin its resolution of outstanding issues in the Ethernet MIB. The
Working Group Charter was presented and interpreted by the Chair. The
Working Group decided to omit from the current version of the MIB the
language that dissociates conformance to the standard from actual
implementation of the relevant objects. The Working Group felt that
resolution of the issues required a more straightforward strategy that
ties implementation requirements to particular operating environments.
The Working Group also decided that distinctions between 802.3 and
Ethernet environments could be a useful principle in articulating
conformance requirements. The Group also agreed that distinctions
between hardware and software implementations of MAC layer functions
would also be an important consideration.
SNMP MIB Compiler (mibcomp)
A Birds of a Feather session on SNMP MIB Compiler technology was
conducted by Dave Perkins of Synoptics. Dave presented his recent work
on MIB compiler technology and explained how it could be valuable both
in syntax checking of MIB documents and as a tool to support development
of SNMP agents.
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SNMP Device Discovery (devdisc)
A Birds of a Feather session on SNMP Device Discovery was conducted by
Fred Baker of ACC. Much time was spent in this session attempting
unsuccessfully to formulate an adequate definition of the problem. The
session articulated some ideas on how remote monitoring technology could
be applied to the device discovery problem, and these were subsequently
presented to the RMON MIB Working Group for its consideration.
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