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SR-TE Path Midpoint Restoration

Document Type Expired Internet-Draft (spring WG)
Expired & archived
Authors Zhibo Hu, Huaimo Chen , Junda Yao , Chris Bowers , Yongqing Zhu , Yisong Liu
Last updated 2024-02-22 (Latest revision 2023-08-21)
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Additional resources Mailing list discussion
Stream WG state Dead WG Document
Polled for WG adoption but not adopted
Document shepherd (None)
IESG IESG state Expired
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


Segment Routing Traffic Engineering (SR-TE) supports explicit paths using segment lists containing adjacency-SIDs, node-SIDs and binding- SIDs. The current SR FRR such as TI-LFA provides fast re-route protection for the failure of a node along a SR-TE path by the direct neighbor or say point of local repair (PLR) to the failure. However, once the IGP converges, the SR FRR is no longer sufficient to forward traffic of the path around the failure, since the non-neighbors of the failure will no longer have a route to the failed node. This document describes a mechanism for the restoration of the routes to the failure of a SR-MPLS TE path after the IGP converges. It provides the restoration of the routes to an adjacency segment, a node segment and a binding segment of the path. With the restoration of the routes to the failure, the traffic is continuously sent to the neighbor of the failure after the IGP converges. The neighbor as a PLR fast re-routes the traffic around the failure.


Zhibo Hu
Huaimo Chen
Junda Yao
Chris Bowers
Yongqing Zhu
Yisong Liu

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)