Abstract
A two-way time synchronization exchange is made symmetric by carrying path information inside the timing messages themselves. As a message travels from a time source toward a time recipient, each forwarding node appends an identifier of the adjacency pointing back toward the node it arrived from, building an ordered record of the links traversed. The time recipient reverses that record to form an explicit reverse route and carries it in the corresponding delay request message. An edge node imposes the reverse route on that message, so it traverses the same links in the opposite order. Both one-way delays are then taken over the same media, and the routing contribution to path asymmetry is removed within one measurement cycle of a topology change, with no pre-provisioned path, no controller, and no requirement that intervening nodes hold timing clocks.
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Recommended Citation
Anonymous, "Enforcing Path Symmetry for Precision Time Protocol Using an In-Band Reverse Segment List Derived from a Recorded Forward Path", Technical Disclosure Commons, ()
https://www.tdcommons.org/dpubs_series/11963