MB-NG Meeting UCL 1 Nov 02

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Status of Task 2 Traffic Generation and
Measurement
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MB NG SuperJANET4 Development Network
Gigabit Ethernet 2.5 Gbit POS Access 2.5 Gbit
POS core MPLS Admin. Domains
RAL/ UKERNA OSM-4GE-WAN-GBIC
Dark Fiber (SSE)
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The Scope and Progress

• Task Define Traffic and measurement systems
  needed to characterise the network
• Network Characteristics
• Measurements and systems
• Background Load traffic
• Two Face2Face and several VC to progress the work
• 4 Documents in preparation
• Network Metrics and Methodologies Framework
• Measurements and Methodology for MB-NG
• Proposed MB-NG QoS tests
• Specification of background generation
• Consideration of tools

4
Network Metrics and Methodologies Framework

• Has set down understanding of Metrics (Network
  Characteristics)
• Latency 1-way, roundtrip
• Loss rate, distribution
• Throughput
• Connectivity and availability
• Very much in line with GGF although terminology
  a bit different
• Like GGF has taken note of IETF IPPM work
• Topics raised include
• Accuracy and systematics/bias of the measurements
  time
• Status Only needs editorial tidyup

5
Measurements and Methodology for MB-NG

• Many good discussions now clear what MB-NG
  requires to observe Network Characteristics -
  Both UDP and TCP traffic considered
• Latency 1-way, roundtrip
• Loss rate, distribution
• Throughput
• Connectivity and availability
• Web100 essential
• A set of these measurements will be used for the
  Policies defined.
• Useful experience from the play-pen / DataGrid
  DataTAG / ATLAS
• Need to include Protocol behaviour and MIB
  information.
• Status Document stalled due to EU demo

6
Proposed MB-NG QoS tests

• Sets down how the measurement and background
  traffic could be combined and applied to various
  QoS scenarios
• BE (as reference)
• EF BE
• BE LBE
• EF, BE LBE
• Some proposals for the parameters (BW,
  scheduling) for QoS Policies
• Useful experience gained from the play-pen
• Extending Task2 towards Task 8
• Status In Draft

7
Defining Background Traffic

• Gained experience with using Smartbits seems
  flexible some scripts in use
• Regular traffic - constant size packet, regular
  spaced in time
• Poisson traffic - constant size, exponential
  spacing to form transient queues
• Variable packet sizes too
• Tools include UDPmon, iperf,
• Investigating code to generate traffic from
  long-tailed distributions
• Still discussing
• IETF traffic mix - different sizes and different
  probability of each size sent
• Play back of real traffic patterns generated from
  packet headers pre-recorded from suitable points
  of the production network. This might include
• Video Conference traffic -gt play back -
  rude/crude tools
• General traffic captured at edge of a site, e.g.
  Manchester
• Web-bursty traffic web mirror wget

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Measurements and Methodology for MB-NG