Abstract
The present disclosure relates to a mechanism for preventing spurious Bidirectional Forwarding Detection (BFD) faults during make-before-break (MBB) updates in a segment-routing traffic-engineering (SR-TE) network (10). A first node (12-1), operating as a head-end router, is configured to perform a label-stack update for a first SR-TE candidate path while maintaining continuity of BFD monitoring. Prior to the update, the first node (12-1) disables a local BFD detection timer and transmits a first BFD control packet that omits a reverse-path Binding Segment Identifier (BSID). The packet includes a diagnostic field instructing a peer node (12-6) to disable its BFD detection timer. During the MBB operation, datapath changes are performed without triggering false BFD faults. Upon completion, the first node (12-1) transmits a second BFD control packet having a diagnostic field to re-enable the peer detection timer, and re-enables its own local timer. This coordinated BFD timer-control mechanism eliminates spurious fault declarations on the peer SR-TE candidate path, thereby enabling hitless SR-TE path updates while maintaining continuous datapath availability and protocol stability.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Anonymous, "Preventing Spurious BFD Faults on Remote Nodes During Make-Before-Break Updates on Local Nodes", Technical Disclosure Commons, ()
https://www.tdcommons.org/dpubs_series/9831