PSAMP Framework Document draft-ietf-psamp-framework-06.txt

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PSAMP Framework Documentdraft-ietf-psamp-framewor
k-06.txt

• Duffield, Greenberg, Grossglauser, Rexford ATT
• Chiou Avici
• Claise, Marimuthu, Sadasivan Cisco

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Summary

• Changes to document since previous version
• Additional changes required
• Open issues
• Status of last call

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Changes to Document since Version 05
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Status

• Framework draft is informational
• Other drafts will become PSAMP normative
  references
• Language issues
• must, should, and may, for guidance

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Technical Changes and Clarifications

• Section 3.3. Selection State
• Selection state is post processing of packets
• Section 3.4 Packet Reports
• Definition explicitly includes selection state
• Section 3.7. PSAMP Device
• Definition added
• Similar to IPFIX device
• Section 5.3. Input Sequence Numbers
• In a composite selector, report input sequence
  numbers for each component selector

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Organizational Changes

• Substantial rewriting in response to feedback
• Abstract
• Rewritten to reflect changes
• Section 1.
• Added PSAMP documents overview
• Section 3.1
• Added PSAMP architecture overview
• Section 3.2-3.7 Terminology
• Terminology broken out by selection/reporting/expo
  rt process
• Ordering not alphabetic, but forward dependencies
  now removed
• Section 3.10
• Added description/pointer on interaction with
  IPFIX

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Organizational Changes (2)

• Section 4. Generic requirements
• Emphasize generic nature of requirements
• Section 4.1. Generic selection requirements
• Minor tweaking of extensibility, flexibility
  and parallel measurement process (last one
  needs moving)
• Encrypted packets
• can be ignored when detected
• detection mechanisms left unspecified
• Section 4.2 Generic reporting requirements
• Minor tweaking of self-defining and accuracy
• Transparency retermed as indication of
  information loss

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Organizational Changes (3)

• Section 5. Packet selection operations
• Section 5.1. Terminology
• Normative reference will be PSAMP-TECH
• Options for Framework doc include none/all/used?
• Intent include only terms used in framework
  draft
• Omission was over-aggressive need to restore
  some hashing terms
• Section 5.2. Selection Operations
• Retained high level descriptions of selection
  operation
• Removed material from old Section 4.2 on hashing
  applications
• Will appear in PSAMP-TECH
• Removed old Section 4.6 on criteria for choice of
  selectors

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Organizational Changes (4)

• Section 6. Reporting Process
• Question arose whether to use IPFIX terminology
• Resolution retain PSAMP terminology
• Better to have clean and consistent set of
  definitions
• IPFIX still in flux
• Sections 6.1. and 6.2
• Clarification that Basic Reporting (i.e. first N
  bytes of packets) is mandatory to support but
  optional to use. May want to use extended
  reporting instead, if supported.

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Organizational Changes (5)

• Section 8. Export Process
• Section 8.1. Reflect choice of IPFIX for export
• IPFIX must support STCP-PR
• congestion avoiding unreliable transport
• Substantial reorganization
• Omit old Section 7.7 on collector based rate
  reconfiguration
• Section 13. Normative References
• Placeholders for other PSAMP documents
• Consequence submission as RFC must wait till
  other docs complete

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Additional Changes Required

• Section 11. Applications
• Rewrite and streamline to bring out unique
  advantages of PSAMP
• Enhanced and new applications
• Section 13. Intellectual Property Statements
• Update to reflect recent IP statement by ATT to
  IETF
• http//www.ietf.org/ietf/IPR/att-ipr-draft-ietf-ps
  amp-framework.txt
• Add reference to Ciscos assertion of IP to IETF
• http//www.ietf.org/ietf/IPR/cisco-ipr-draft-ietf-
  psamp-protocol.txt
• Essentially the same (usual) terms
• License under fair and reasonable terms,
  non-discriminatory, reciprocity

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Open Issues

• Section 8. PSAMP Requires explicit rate limit for
  export
• Useful e.g. to limit rate implosion at collector
  when multiple PSAMP devices export to a collector
• Even when no network congestion
• Does IPFIX support an explicit rate limit?
• Status of Last Call
• Wait for other PSAMP WG documents to be
  completed?

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Please read the Framework Draft!

• Technical content (almost) stable
• Organization substantially changed in this
  version
• Needs careful reading
• Please send comments to list