802.1Qat Current Status Craig Gunther (cgunther@harman.com) - - PowerPoint PPT Presentation

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802.1Qat Current Status Craig Gunther (cgunther@harman.com) - - PowerPoint PPT Presentation

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802.1Qat Current Status Craig Gunther (cgunther@harman.com) 11November2008 Topics What is Qat? Concepts Interfaces & Propagation Status 11 November 2008 IEEE 802.1 Plenary Dallas 2 What is Qat? 11 November 2008 IEEE 802.1

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Craig Gunther (cgunther@harman.com)

11November2008

802.1Qat Current Status

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Topics

  • What is Qat?
  • Concepts
  • Interfaces & Propagation
  • Status

2 11 November 2008 IEEE 802.1 Plenary ‐ Dallas

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What is Qat?

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Synopsis

A protocol that provides end points with the ability to reserve network resource that will guarantee the transmission and reception of data streams across a network with the requested quality of service.

11 November 2008 IEEE 802.1 Plenary ‐ Dallas 4

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Acronyms & Definitions

  • DMN: Designated MSRP Node (802.1Qat)
  • MRP: Multiple Registration Protocol (802.1ak)
  • MSRP: Multiple Stream Reservation Protocol (802.1Qat)
  • MSRPDU: MSRP Protocol Data Unit (802.1Qat)
  • MAD: MRP Attribute Declaration (802.1ak)
  • MAP: MRP Attribute Propagation (802.1ak)
  • Qat: Stream Reservation Protocol (802.1Qat)
  • Qav: Forwarding and Queuing (802.1Qav)
  • Talker: A device that produces a data stream
  • Listener: A devices that consumes a data stream

11 November 2008 IEEE 802.1 Plenary ‐ Dallas 5

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Concepts

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Declarations

  • TalkerAdvertise

“I have a stream if you want it”

  • TalkerFailed

“I have a stream, but you can’t get it”

  • ListenerReady

“I (we) want the stream and have network resource available to receive it”

  • ListenerAskingFailed

“I (we) want the stream, but do NOT have network resources to receive it”

  • ListenerReadyFailed

“We want the stream and some can receive it and some can NOT”

7 11 November 2008 IEEE 802.1 Plenary ‐ Dallas

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Some Internals

  • Simple TSpec (Traffic Specification)

– Bandwidth in Kbytes/second – Frame Rate in frames/second

  • Shared Medium DMN (Designated MSRP Node)

– A MSRP “proxy” for the shared media network – Qat uses the DMN to map shared media QoS protocols to/from MSRP – Double transmit bandwidth concerns

11 November 2008 IEEE 802.1 Plenary ‐ Dallas 8

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Bandwidth Allocation Algorithm

  • Who gets the bandwidth?

– Streams with Active Listeners – Streams have a Rank for importance

  • 911 call
  • Safety announcements, etc

– First‐come first‐served – StreamID is the tie‐breaker

  • Streams with no Active Listeners do not

reduce available bandwidth

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Interfaces & Propagation

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MSRP interfaces

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SR Station Attribute Propagation

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Bridge Attribute Propagation

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MSRP Service Primitives

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Bridge Forwarding a Stream

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MRPDU

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MSRPDU TalkerAdvertise Message

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Status

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Today’s Status

  • Service Primitives are documented
  • MSRPDUs are documented
  • CSN Shared Media DMN documented
  • Bandwidth Allocation Algorithm is

documented

  • Need:

– MIB, PICS, Conformance, Management – 802.11 DMN documentation

11 November 2008 IEEE 802.1 Plenary ‐ Dallas 19

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Thanks!

20 11 November 2008 IEEE 802.1 Plenary ‐ Dallas