Deterministic Fast Router Advertisement Configuration Update draft-daley-dna-det-fastra-01.txt Presenter: Greg Daley

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).

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

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.

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) * Sep Fastest

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

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

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)

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.

References: Issues list and draft diffs: – ew/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