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IGP Data Plane Convergence Benchmarking: Methodology, Terminology, and Considerations

This document outlines the benchmarking methodology, terminology, and considerations for IGP data plane convergence. It details revisions made between IETF meetings to improve clarity and precision in definitions and equations related to sustained convergence time and network behavior. Key terminology has been defined to facilitate understanding and application in both IPv4 and IPv6 scenarios. The document aims to enhance the consistency and effectiveness of benchmarking efforts in the networking community, paving the way for IESG review and further WG discussions.

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IGP Data Plane Convergence Benchmarking: Methodology, Terminology, and Considerations

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  1. IGP Data Plane Convergence Benchmarking draft-ietf-bmwg-igp-dataplane-conv-app-05.txtdraft-ietf-bmwg-igp-dataplane-conv-term-05.txt draft -ietf-bmwg-igp-dataplane-conv-meth-05.txt Authors: Scott Poretsky, Quarry Technologies Brent Imhoff, LightCore 62nd IETF Meeting – Minneapolis

  2. Version History • 3 documents for work item = methodology, terminology, and considerations • Had a WG Last Call for –03 revisions of all 3 docs prior to IETF 60 BMWG meeting where additional comments received. • -04 revisions posted to incorporate comments made during IETF 60. • Additional comments to –04 were received at IETF 61 BMWG meeting and electronically. These necessitated a –05. • -05 posted for all 3 docs to incorporate (final?) comments prior to IETF 62.

  3. Summary of Terminology -05 Changes • Updated to preferred Existing Definitions Statement • Changed equation 3 and added comment in Discussion for Sustained Convergence Time “(eq 3) Sustained Forwarding Convergence Time = 5 x (# routes in FIB) / (Offered Load) for which at least one packet per destination MUST be received at the DUT.” • Added note that the “Next-Best Egress Interface” must be the same link speed and media type as the “Preferred Egress Interface”. • Added definition for “Nested Convergence Events” “The occurrence of Convergence Event while the route table is converging from a prior Convergence Event.”

  4. Summary of Methodology -05 Changes • Updated to preferred Existing Definitions Statement • Added note in Introduction that Methodologies apply to IPv4 and IPv6 traffic and IGPs. • Paragraph 3.2.7 Interface Types was written so that any interface type can be used (previously recommended SONET) • Added note to paragraph 3.2.5 Convergence Time Metrics that “The Packet Sampling Interval value is the smallest measurable convergence time.”

  5. Next Steps • Any other comments? • Ready for another WG Last Call? • Ready for IESG Review?

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