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- Editor's Note: These minutes have not been edited.
-
-
- Hello there:
-
- Herewith the minutes for the RTFM session at Memphis.
-
- Please note that the WG considered its charter carefully and revised
- the Goals and Milestones - these are included in the minutes. The
- body of the charter is OK as it is, but the WG will consider it on the
- mailing list and will produce revised text before the Mubnich meeting.
-
- Cheers, Nevil
-
- +-----------------------------------------------------------------------+
- | Nevil Brownlee Director, Technology Development |
- | Phone: +64 9 373 7599 x8941 ITSS, The University of Auckland |
- | FAX: +64 9 373 7425 Private Bag 92019, Auckland, New Zealand |
- +-----------------------------------------------------------------------C
-
-
- Minutes of the RTFM WG Sseeion at Memphis IETF, 1300 Tue 8 Apr 97
- -----------------------------------------------------------------
-
- Reported by Stephen Stibler and Greg Ruth
-
- 'NEW METER MIB' INTERNET DRAFT:
-
- Nevil Brownlee (The University of Auckland) is proposing a new version
- of the Meter MIB, to improve on RFC 2064 from implementation experience.
- He gave a presentation explaining the MIB changes proposed in the I-D,
- and others resulting from his implementation work. The changes are:
-
- - Textual Conventions have been added or extended for the
- different address types, i.e. MediumType, MediumAddress,
- PeerType, PeerAddress, AdjacentType and AdjacentAddress.
-
- - The RuleAttributeNumber textual convention has been extended
- to include MatchingStoD (a 'packet matching' attribute), and
- to allow the testing of computed attributes.
-
- - A few variables have been added to the Ruleset, Manager and
- Meter Reader Info Tables so as to provide better control and
- co-ordination for meters and meter readers.
-
- - A new table of 'flowPackage' objects has been added. This allows
- a meter reader to retrieve values for a list of attributes from a
- single flow. The values are returned in a BER-encoded sequence,
- which provides a simple, standard way to retrieve large amounts of
- flow data.
-
- - The 'Security Considerations' section has been extended to suggest
- several ways to protect the meter and its flow data.
-
- The WG agreed that a new version of the draft, with these changes
- and other editorial changes to the supporting sections, should be
- published. It will be put to a WG last call, then submitted to
- IESG for publication as a Proposed Standard RFC.
-
-
- PERFORMANCE MEASURES FOR MULTIMEDIA APPLICATIONS:
-
- Randy Bloomfield (Institute for Telecommunication Sciences, Boulder,
- Colorado (part of NTIA)) gave a short presentation on this topic. ITS
- has focussed on developing user-oriented performance measures which are
- technology-independent, perception-based and objectively evaluated.
- They have also developed a system to make these measurements by
- examining the audio/video signal.
-
-
- New measurement techniques like these are required to assess the effects
- of new impairments to digital audio, video and multimedia data streams,
- particularly where these streams are carried across a data network.
- For example:
-
- for video: error blocks, tiling, jerkiness, smearing
- for audio: non-stationary compression artifacts
- (burbling, wavering, quivering)
-
- It is important to note that quality often depends on the information
- complexity at the source.
-
- This work could provide input for RTFM in suggesting new attributes
- which are important in measuring transmission of this kind of data.
- Randy offered a demonstration of the ITS measurment system at a future
- IETF meeting. He can be contacted at randy@its.bldrdoc.gov.
-
-
- 'NEW ATTRBUTES FOR TRAFFIC FLOW MEASUREMENT' INTERNET DRAFT:
-
- Sig Handelman (IBM) presented the latest draft of the I-D. It considers
- work on performance in other WGs in the areas of connectivity,
- throughput, packet loss and delay metrics; these are also of interest
- to the BMWG/IPPM, RSVP and RMON2 WGs. In addition, MIB2 has many
- variable which are of interest in performance measurement.
-
- The new attributes have three forms: packet traces, aggregates and
- series. They should be useful for the analysis of performance,
- congestion and normal vs. abnormal network behavior.
-
- Stephen Stibler (IBM) described his implementation work in this area,
- showing histograms of forward- and backward- packet inter-arrival times
- collected for specified UDP flows. Buckets with specified upper bounds
- were used to group the data within the meter.
-
- Stephen has not yet attempted to extend the Meter MIB to include the
- new attributes. The WG spent some time discussing how the Traffic
- Measurement Architecture could be extended to allow specification of:
-
- - Ways of specifying data set parameters
- (buckets, histograms, rate-determining intervals, etc.)
- - Complex measures to calculate
- (e.g. packet loss from TCP analysis)
- - Rule actions required to collect 'new attribute' data from packets
-
- An area of particular interest is the need to make the architecture
- extensible so as to allow further new attributes to be added as the need
- arises. Implementation work on new attributes will also continue, with
- a view to determining an initial set of the new attributes. The WG
- agreed that these issues should be discussed on the mailing list so as
- to produce a more complete version of the I-D by August 97.
-
-
- THE RTFM WG CHARTER:
-
- The RTFM WG needs to review/revise its charter because
-
- - It has moved into a new IETF Area (Transport)
- - There is an increased emphasis on security within IETF
-
- The WG discussed its existing charter. It still appears to describe the
- WG's goals well, but needs to make a more definite statement about
- security. Only one of the original subgoals has not been worked on -
- developing better ways to specify the flows of interest; this will also
- be addresses. Discussion of goals and security on the mailing list was
- requested.
-
- Our current list of Goals and Milestones was updated to the following:
-
- April 97: Submit Meter MIB I-D to IESG for publication as
- Proposed Standard RFC
-
- August 97: Publish revised and expended I-D on 'New' Attributes
- Publish revised 'Architecture' I-D to cover new attributes
-
- March 97: Submit I-Ds on 'New' Attributes and Architecture as
- Standards Track RFCs
-
- This list of goals may change as the WG's understanding of the new
- attributes grows with implementation experience.
-
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-