I-D Action: draft-dikshit-bess-evpn-mobility-crdt-00.txt

Internet-Draft draft-dikshit-bess-evpn-mobility-crdt-00.txt is now available.

   Title:   Modeling EVPN MAC-Mobility Sequence State as a Conflict-Free Replicated Data Type
   Author:  Saumya Dikshit
   Name:    draft-dikshit-bess-evpn-mobility-crdt-00.txt
   Pages:   5
   Dates:   2026-08-29

Abstract:

   EVPN MAC Mobility, as carried in the MAC Mobility Extended
   Community defined by [RFC7432], uses a per-MAC sequence number to
   let PEs agree on the most recent location of a moving host.
   [I-D.ietf-bess-evpn-umr-mobility] extends this to cross-data-center
   moves via gateways, and already specifies, in some detail, how
   ordinary intra-DC and inter-DC moves are kept consistent: each
   gateway maintains two independent MAC Mobility sequence counters
   per host (one intra-DC, one inter-DC) specifically so that a
   purely local move does not have to be reconciled against the
   interconnect network's state. What that document does not specify
   is what a gateway does if it fails after locally resetting its
   intra-DC counter to zero (Section 5.2, the step taken when a host
   is confirmed to have left every local PE) but before propagating
   that fact onward; no failure-handling or crash-recovery text
   exists anywhere in the document. This document shows that this
   narrower, but concretely unaddressed, gap is a special case of a
   data type with known, formally proven convergence properties, the
   Last-Writer-Wins Register, one member of the Conflict-Free
   Replicated Data Type (CRDT) family, and proposes modeling the
   per-gateway mobility sequence state that way so that a mid-reset
   gateway crash is recovered from as a consequence of the data
   type's algebra rather than requiring a new, separately specified
   recovery procedure.

The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-dikshit-bess-evpn-mobility-crdt/

There is also an HTMLized version available at:
https://datatracker.ietf.org/doc/html/draft-dikshit-bess-evpn-mobility-crdt-00

Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts


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