Deterministic Fast Router Advertisement Configuration

1
Deterministic Fast Router Advertisement
Configuration

• Update
• draft-daley-dna-det-fastra-01.txt
• Presenter Greg Daley

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Status of draft

• Feedback from 00 draft
• Preferred simpler solution if available.
• Issues captured and tracked (not all resolved)
  Feedback from 00 draft by Jari Arkko and SooHong
  (Daniel) Park
• Changes incorporated into -01
• No Host interaction with DetFRA options
• Simplification of delay calculation (Impl).

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Why Deterministic Fast RA?

• Getting RAs fast is part of DNA goals
• Existing RS response proposals didnt allow
  automated Fastest Router conf
• Rely on only one router, or manual config
• Deterministic Fast RA provides a negotiated
  ordering amongst responding routers
• Automated
• Works with arbitrary router topologies

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Implementation

• Router function implemented in RADVD
• Early alpha, a few days to implement (lt week)
• Tested under Linux.
• Uses ICMPv6 Router-to-Router messages.
• Exchanged messages modify router ranking
• Router responses at agreed fixed delay
• Requires Router Solicitations (link hints?)
• No Multicast FastRAs yet.

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Coding Issues (Ranking)

• RankScore calculation straightforward
• Ranking possible as list
• update on RtR receive.
• Care needed to make checks simple, fast.
• Original timing calculations cumbersome
• Sum of preceding routers Separation values
• Suggest FixDelay (Rank 1) SepFastest

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Coding Issues (Messages)

• Router-to-Router (RtR) state machine DetFastRA
  messaging separate tasks
• separately or together??
• Router-to-Router Messages
• controls change advertisement
• provides transport
• LinkID reuses RtR state machine.
• No SEND authorization on RtR yet

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Differences in Draft-01

• Removes
• All host facing DetFastRA messages removed
• Changes
• Tidied up RtR state timers
• Change delay calculation to (Rank-1)Sepfastest
• Suggested new router-to-router multicast group

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Action Items (1 of 2)

• Get feedback from WG
• Usefulness
• Complexity
• Validity of Router-to-Router
• Document contents (RtR method?)
• Follow up existing issues list
• Make code available (BSD license - radvd)

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Action Items (2 of 2)

• Router Ranking Convergence testing
• Largely predictable
• Testing with packet loss
• Effects on convergence
• Effects on DNA timing
• SEND Router authorization (further out)
• Scalability simulation/calibration
• Determine maximum effective ranks.

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References

• Issues list and draft diffs
• http//ctieware.eng.monash.edu.au/twiki/bin/view/D
  NA/DetFastRA
• Related drafts
• draft-daley-dna-det-fastra-01.txt
• draft-mkhalil-ipv6-fastra-05.txt
• draft-pentland-mobileip-linkid-02.txt
• draft-ietf-ipv6-2461bis-01.txt
• RFC 2461