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

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

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  1. PSAMP Framework Documentdraft-ietf-psamp-framework-06.txt Duffield, Greenberg, Grossglauser, Rexford: AT&T Chiou: Avici Claise, Marimuthu, Sadasivan: Cisco

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

  3. Changes to Document since Version 05

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

  5. 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

  6. 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/export process • Ordering not alphabetic, but forward dependencies now removed • Section 3.10 • Added description/pointer on interaction with IPFIX

  7. 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”

  8. 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

  9. 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.

  10. 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

  11. 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 AT&T to IETF • http://www.ietf.org/ietf/IPR/att-ipr-draft-ietf-psamp-framework.txt • Add reference to Cisco’s 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

  12. 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?

  13. Please read the Framework Draft! • Technical content (almost) stable • Organization substantially changed in this version • Needs careful reading • Please send comments to list