Pipefitters BOF

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Pipefitters BOF

• Jeff Boote, Eric L. Boyd, Rich Carlson, Hyungseok
  Chung

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Pipefitters BOF

• BWCTL Bandwidth Control (Jeff Boote)
• Building a Measurement Framework Request and
  Response Schemas (Eric Boyd)
• Detective Integrating NDT and E2E piPEs (Rich
  Carlson)
• Wise Trafview Flow-based Measurement and
  Analysis System (Hyungseok Chung)

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Building a Measurement Framework Request and
Response Schemas

• Eric L. Boyd, Internet2
• Reporting on GGF NMWG Activities

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GGF Network Measurement Working Group

• Hierarchy of Network Performance Characteristics
• Request Schema Requirements and Sample
  Implementation

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Network Performance Characteristics Sub-WG

• Les Cottrell, SLAC
• Richard Hughes-Jones, University of Manchester
• Thilo Kielmann, Vrije Universiteit
• Bruce Lowenkamp, College of William and Mary
• Martin Swany, University of Delaware
• Brian Tierney, LBNL

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Hierarchy of Network Performance Characteristics

• Standard set of network characteristics
• Network classification hierarchy
• Useful for Grid applications and services
• Facilitates portability of all measurements
  actually taken
• Submitted to GGF
• http//www-didc.lbl.gov/NMWG/docs/draft-ggf-nmwg-h
  ierarchy-02.pdf

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Terminology

• Network characteristics are the intrinsic
  properties of a portion of the network that are
  related to the performance and reliability of the
  network.
• Measurement methodologies are the means and
  methods of applying those characteristics
• An observation is an instance of the information
  obtained by applying the measurement methodology.

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Relationship between Terms
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Describing a Network Measurement

• Two Elements
• Characteristic being Measured
• Network Entity that the Measurement Describes
• Nodes
• Paths

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Relationship between Node and Path Network
Entities
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Characteristics

• GGF Discovery and Monitoring Event Descriptions
  (DAMED) WG
• ltentity typegt.ltcharacteristicgt.ltsub-characteristic
  gt
• Examples
• path.delay.oneway
• path.loss.oneway
• path.bandwidth.achievable

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Subset of Characteristics
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Network Topology Representation

• End-to-end are the common case of host-to-host
  measurements
• Links between between routers and switches are
  frequently measured for capacity, availability,
  latency, and loss
• Nodes may report useful information such as
  router queue discipline or host interface speed
• Physical vs. Functional Topologies
• Nodes Hosts, Internal Nodes, Virtual Nodes

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GGF Network Measurement Working Group

• Hierarchy of Network Performance Characteristics
• Request Schema Requirements and Sample
  Implementation

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Request Schema Sub-Working Group

• Mark Leese, Daresbury Laboratory
• Nicolas Simar, DANTE
• Loukik Kudarimoti, DANTE
• Jeff Boote, Internet2
• Eric Boyd, Internet2
• Matt Zekauskas, Internet2
• Dan Gunter, LBNL
• Tanya Brethour, NLANR/DAST
• Paul Mealor, University College London
• Warren Matthews, Georgia Tech

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Test / Data Request and Response Protocol
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Request Schema

• Requirements Document http//www.gridmon.dl.ac.uk
  /nmwg/request_schema_requirements-01b.rtf
• Schema and Examples
• http//www.hep.ucl.ac.uk/pdm/nmwg/
• XML Spy Documentation
• http//www.hep.ucl.ac.uk/pdm/nmwg/Dante-NM-WG-Re
  questSchema2-docs/element_NetworkMeasurementReque
  st_Link028220C0

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What Measurement/Metric Info

• Use DAMED-style name
• One characteristic / message
• Possible to request multiple statistical data
• Extensible to unsupported statistical data
• Number of Results (Positive real number or all)

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Where Source and Destination Information

• Flexible, allow
• Hostnames
• IP Addreses (IPv4 and IPv6)
• Aliases (e.g. edge router), if alias file known
  to source and destination
• Source Address info required

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When Time Information (1)

• Target Time
• Target Time (Absolute Time or now)
• Relative negative and positive time tolerances
• Negative time tolerance can be (infinity)
• Time Interval
• Give Start End Time
• Target Time Start Time
• Negative Time Tolerance 0
• Positive Time Tolerance End Time Start Time
• Max Results all
• Absolute Time
• Seconds since 1970, XML type, or NTP timestamp)

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When Time Information (2)

• Evaluate now as late as possible
• Testing Interval to Control Timing of Tests
• Specified in Seconds, accurate to microsecond
  granularity

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How Test Parameters (1)

• Allow either
• NMWG-style Predefined Tags
• ltpacketTypeParamgtTCPlt/packetTypeParamgt
• Or
• Allow Command-Line Tool Parameters
• ltsourceParameterStringgt-c p 501lt/sourceParameterS
  tringgt
• ltdestParameterStringgt-s w 1024klt/destParameterStr
  inggt

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How Test Parameters (2)

• Maintain Parameter Order
• Employ Receiving System Parameter Defaults
• Reject Requests if Required Parameter Cannot be
  Supported
• Ability to Request Measurement Parameters
• Ability to Set Ranges and Preferential Order for
  Tool Parameters

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Other (Non-)Requirements

• Desirable Ability to add Custon Tags
• Non-Requirements Ability to query monitoring and
  data publishing capabilities
• What network monitoring data available?
• What tools are available?
• What are tool versions?
• What parameters can be used with tools?

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Request Schema Example

• http//www.hep.ucl.ac.uk/pdm/nmwg/2004-01-08-Dant
  e-NM-WG-RequestSchema2-examples/Dante-NM-WG-Reques
  tSchema2-demo-Iperf.xml

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Conclusions

• Consensus emerging on network measurement
  characteristic definitions
• Test/Data Request and Response Schemas in Alpha
  Form
• Future work includes
• Abstracting commonalities between request and
  response schemas into an inherited schema
• Intermediate schemas
• Full-blow Grid Service (including Discovery, AA)

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