Refresh-Interval Independent RSVP Fast Reroute Facility Protection
RFC 9705, “Refresh-Interval Independent RSVP Fast Reroute Facility Protection”, is a Proposed Standard document published in March 2025 by C. Ramachandran, T. Saad, D. Pacella. It updates RFC 4090. The canonical text is published by the RFC Editor.
Abstract
The RSVP-TE Fast Reroute (FRR) extensions specified in RFC 4090 define two local repair techniques to reroute Label Switched Path (LSP) traffic over pre-established backup tunnels. Facility backup method allows one or more LSPs traversing a connected link or node to be protected using a bypass tunnel. The many-to-one nature of local repair technique is attractive from a scalability point of view. This document enumerates facility backup procedures in RFC 4090 that rely on refresh timeout, hence, making facility backup method refresh-interval dependent. The RSVP-TE extensions defined in this document will enhance the facility backup protection mechanism by making the corresponding procedures refresh-interval independent, and hence, compatible with the Refresh-Interval Independent RSVP (RI-RSVP) capability specified in RFC 8370. Hence, this document updates RFC 4090 in order to support the RI-RSVP capability specified in RFC 8370.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 9705 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
- RFC 9704 Establishing Local DNS Authority in Validated Split-Horizon Environments
- RFC 9706 TreeDN: Tree-Based Content Delivery Network for Live Streaming to Mass Audiences
- RFC 9707 Report from the IAB Workshop on Barriers to Internet Access of Services
- RFC 9702 YANG Data Model for Maximum Segment Identifier Depth Types and MPLS MSD
- RFC 9708 Use of the HSS/LMS Hash-Based Signature Algorithm in the Cryptographic Message Syntax
- RFC 9701 JSON Web Token Response for OAuth Token Introspection
- RFC 9709 Encryption Key Derivation in the Cryptographic Message Syntax Using HKDF with SHA-256
- RFC 9700 Best Current Practice for OAuth 2.0 Security