deterministic fast router advertisement configuration update draft-daley-dna-det-fastra-01.txt...
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![Page 1: Deterministic Fast Router Advertisement Configuration Update draft-daley-dna-det-fastra-01.txt Presenter: Greg Daley](https://reader036.vdocuments.us/reader036/viewer/2022082819/56649f325503460f94c4d887/html5/thumbnails/1.jpg)
Deterministic Fast Router Advertisement Configuration
Update
draft-daley-dna-det-fastra-01.txt
Presenter: Greg Daley
![Page 2: Deterministic Fast Router Advertisement Configuration Update draft-daley-dna-det-fastra-01.txt Presenter: Greg Daley](https://reader036.vdocuments.us/reader036/viewer/2022082819/56649f325503460f94c4d887/html5/thumbnails/2.jpg)
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 didn’t
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
![Page 4: Deterministic Fast Router Advertisement Configuration Update draft-daley-dna-det-fastra-01.txt Presenter: Greg Daley](https://reader036.vdocuments.us/reader036/viewer/2022082819/56649f325503460f94c4d887/html5/thumbnails/4.jpg)
Implementation
• Router function implemented in RADVD– Early alpha, a few days to implement (< 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.
![Page 5: Deterministic Fast Router Advertisement Configuration Update draft-daley-dna-det-fastra-01.txt Presenter: Greg Daley](https://reader036.vdocuments.us/reader036/viewer/2022082819/56649f325503460f94c4d887/html5/thumbnails/5.jpg)
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 router’s Separation values– Suggest FixDelay= (Rank – 1) * SepFastest
![Page 6: Deterministic Fast Router Advertisement Configuration Update draft-daley-dna-det-fastra-01.txt Presenter: Greg Daley](https://reader036.vdocuments.us/reader036/viewer/2022082819/56649f325503460f94c4d887/html5/thumbnails/6.jpg)
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
![Page 8: Deterministic Fast Router Advertisement Configuration Update draft-daley-dna-det-fastra-01.txt Presenter: Greg Daley](https://reader036.vdocuments.us/reader036/viewer/2022082819/56649f325503460f94c4d887/html5/thumbnails/8.jpg)
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/DNA/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