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Editor's note: Minutes received 4/12/93. These minutes have not been edited
and the attendee list has not been appended.
Reported by Kaj Tesink
ATM MIB BOF MEETING NOTES
On April 1, 1993, Kaj Tesink/Bellcore convened
an ATM MIB BOF. The purpose of the BOF was to
determine if there was sufficient interest
to create a WG to develop managed objects for ATM.
The BOF agenda included four presentations,
plus a discussion period:
1) Overview, Proposed Charter (Kaj Tesink)
2) ATM MIB Strawperson Proposal (Masuma Ahmed)
3) ATM ILMI (Keith McCloghrie)
4) SONET MIB (Kaj Tesink)
Overview - Kaj Tesink
-------------------------
Following unanimous agreement that a WG is necessary
to develop managed objects related to ATM, Kaj
identified the following "terms of
reference" as the basis for the proposed
charter of the ATM MIB work effort:
+ Priority on ATM PVCs
+ Keep the MIB small
+ Priority is creation of a SNMPv1 managed objects,
support of SNMPv2 may be a future effort
+ Difference between interface and end-to-end
view of NM information for ATM
Kaj discussed the relationship of the proposed
ATM MIB with physical layer MIBs. He suggested that
the WG include work on the SONET MIB which was
posted by Tracy Cox. The Trunk MIB WG which had
developed MIBs for DS1/E1 and DS3/E3 no longer exists.
Ayal Opher cautioned against assuming that the
SONET MIB is "done". Since there are more
implementations of SONET equipment, folks may
pay more attention and have more comments on
the proposed SONET MIB module.
There was discussion on the different perspectives
on ATM-related network management information:
+ Local DTE view of ATM-based communication over the
local interface
+ Network view of the local interface
+ End-to-end view of the communication path
+ ATM Switch Management - both private and public
+ ATM-based Service information - both private and public
These different perspectives drive identification of
different sets of managed objects.
Based on this discussion, a charter was agreed upon,
that directs the proposed WG to undertake work on
ATM and SONET management (attached).
ATM MIB Proposal - Masuma Ahmed
-------------------------------
Masuma gave an overview of a Bellcore strawperson proposal
for an ATM MIB. See the copy of the viewgraphs for a detailed
list of proposed management information. The strawperson MIB
is based on the ILMI, and includes configuration information
about the ATM interface, ATM layer statistics, but (unlike
the ILMI) also VPL/VCL level performance information. Virtual
Channel Links are the interfaces between two adjacent ATM
devices. A Virtual Channel Connection is the set of VCLs used
end-point to end-point. A VCL is identified by a Virtual
Channel Identifier (VCI). Similarly, a Virtual Path
Connection consists of VPLs, identified by VPIs.
Issues identified during the discussion included:
+ Relation to the existing ILMI MIB (see Keith's talk)
+ The need for end-to-end PVC configuration information
+ Modelling of ATM in relation to MIB II interfaces table
+ Need to keep the MIB small
+ Need to coordinate modelling of PVCs with FR MIB effort
+ Need for AAL performance statistics
+ Need for VPC/VCC level performance statistics
ATM Forum ILMI - Keith McCloghrie
---------------------------------
Keith gave a presentation on the ATM Forum's Interim Local
Management Interface ILMI, stressing
that even though the ILMI uses SNMP packet formats, the
purpose of the ILMI is not network management, but rather
"interface management". However, since the management
information needed for interface management is a subset of
the information needed for network management, the ILMI's MIB
should be appropriate for use by network management as
well as for interface management.
The ATM Forum's ILMI MIB was designed to be symmetric --
that is, to have the same MIB on each side of the interface.
It currently contains read-only objects. The ILMI MIB
contains information on the physical port (e.g.,operStatus),
ATM Layer, ATM Cell, and VPC/VCCs. There are no VCL or VPL
level statistics in the ILMI.
Keith recommended that the proposed IETF Working Group use
the ILMI MIB as a base for the development of IETF ATM
MIB(s). The management of the local interface should use a
common MIB module/table/group.
SONET MIB - Kaj Tesink
----------------------
Kaj gave a short presentation of the SONET MIB. The SONET MIB
has been posted as Internet-Draft for a long time. It is
consistent with other trunk MIBs. A minor change may be
needed on table indexing. Interested people are encouraged to
review this MIB.
Internet-Draft:
"Definitions of Managed Objects for the SONET Interface
Type", Jan.1993, Tracy A. Cox, Kaj Tesink,
<draft-ietf-cox-sonetmib-01.txt>.
Conclusions of the Working Group
-------------------------------
1) There is interest in forming a Working Group to develop
standard managed objects for ATM and SONET.
Deirdre Kostick suggested to call it the AToMMIB WG, with the
"o" signifying SONET, and the "AToM as a reminder to keep
MIBs small(!).
2) It is likely that there will be multiple MIB modules for
ATM developed to support the different management
perspectives identified during the BOF.
3) The MIB module(s) for management for the local interface
should build on the ATM Forum ILMI MIB.
Charter proposed AToM MIB WG (atommib)
--------------------------------------
Chair(s):
Kaj Tesink <kaj@cc.bellcore.com>
Network Management Area Director(s)
Marshall Rose <mrose@dbc.mtview.ca.us>
NM-Directorate Consultant:
Keith McCloghrie <kzm@hls.com>
Mailing Lists:
General Discussion:atommib@thumper.bellcore.com
To Subscribe: atommib-request@thumper.bellcore.com
Archive: thumper.bellcore.com:pub/tob/atommib
Description of Working Group:
The AToM MIB Working Group is chartered to define sets of managed
objects which will be useful in the management of ATM and SONET
equipment, interfaces, networks, and/or services that conform
to the relevant ATM and SONET specifications. The initial sets
defined will be:
- an interface-specific MIB for ATM interfaces, which is aligned with
the managed objects for interface layering being defined by the
Interfaces MIB WG. The working group should consider the ATM
Forum's ILMI MIB for its suitability in this respect, plus any
extensions necessary to instrument the layers between the ATM
layer and the IP layer (e.g., AAL5). The latter should be
take into account the work of the IP-over-ATM
working-group (e.g., the "Multi-Protocol over AAL5"
specification).
- managed objects for the monitoring and control of ATM PVCs and
SVCs, both in ATM end-points and in ATM switches or networks.
(objects for ATM SVCs will be considered after completion of the
work on ATM PVCs).
- managed objects that instrument devices with SONET interfaces
that conform with the relevant SONET specifications. This work
should closely align to other trunk MIBs (DS1/E1 MIB, DS3/E3 MIB).
The working group should consider the existing Internet-Draft SONET
MIB for its suitability in this respect.
The objects defined by the working group will be consistent with
the SNMP framework.
Goals and Milestones:
May 93 Begin developing internet-drafts for discussion.
Oct 93 Post revised internet-drafts for discussion.
Dec 93 Submit internet-drafts to IESG for standards track evaluation.