API Build-data JSON Resources
Theme

Choose how MSRBot.io looks on this device.

Auto (match system) Light mode Dark mode

Preference is stored in this browser only.

IETF RFC 4920
[ACTIVE]

Crankback Signaling Extensions for MPLS and GMPLS RSVP-TE

Metadata

Publisher
IETF
Doc Type
Standard
Pages
38
Abstract
In a distributed, constraint-based routing environment, the information used to compute a path may be out of date. This means that Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS) Traffic Engineered (TE) Label Switched Path (LSP) setup requests may be blocked by links or nodes without sufficient resources. Crankback is a scheme whereby setup failure information is returned from the point of failure to allow new setup attempts to be made avoiding the blocked resources. Crankback can also be applied to LSP recovery to indicate the location of the failed link or node. This document specifies crankback signaling extensions for use in MPLS signaling using RSVP-TE as defined in "RSVP-TE: Extensions to RSVP for LSP Tunnels", RFC 3209, and GMPLS signaling as defined in "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Functional Description", RFC 3473. These extensions mean that the LSP setup request can be retried on an alternate path that detours around blocked links or nodes. This offers significant improvements in the successful setup and recovery ratios for LSPs, especially in situations where a large number of setup requests are triggered at the same time. [STANDARDS-TRACK]
Publication Date
2007-07-01
Status Note
Proposed Standard
DOI
10.17487/RFC4920
Link
https://doi.org/10.17487/RFC4920
Author(s)
Adrian Farrel
Arun Satyanarayana
Atsushi Iwata
Norihito Fujita
Gerald Ash
Keyword(s)
MPLS, GMPLS, MPLS-TE, TE LSP, LSP
Latest version of IETF RFC 4920

Document Versions — IETF RFC 4920

  • ▶ IETF RFC 4920 (2007-07-01)
    THIS DOC [ACTIVE] [LATEST VERSION]

Normative Reference(s)

Bibliographic Reference(s)

Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/RFC4920.json

Reference Tree

Explore all references and references to this document, as a navigable tree.

Open Reference Tree
Reference this Doc

Plain text (ISO 690 compliant)

Preview:
IETF RFC 4920, Crankback Signaling Extensions for MPLS and GMPLS RSVP-TE. Available at https://doi.org/10.17487/RFC4920
Snippet:
IETF RFC 4920, Crankback Signaling Extensions for MPLS and GMPLS RSVP-TE. Available at https://doi.org/10.17487/RFC4920

HTML (ISO 690 compliant)

Preview:
IETF RFC 4920, Crankback Signaling Extensions for MPLS and GMPLS RSVP-TE. Available at https://doi.org/10.17487/RFC4920
Snippet:
<span class="citation"><cite>IETF RFC 4920</cite>, Crankback Signaling Extensions for MPLS and GMPLS RSVP-TE. Available at <a href="https://doi.org/10.17487/RFC4920" target="_blank" rel="noopener">https://doi.org/10.17487/RFC4920</a></span>

SMPTE Icon SMPTE's HTML Pub

Preview:
IETF RFC 4920, Crankback Signaling Extensions for MPLS and GMPLS RSVP-TE
doi: 10.17487/RFC4920
url: https://doi.org/10.17487/RFC4920
Snippet:
<li>
<cite id="bib-rfc4920">IETF RFC 4920</cite>, Crankback Signaling Extensions for MPLS and GMPLS RSVP-TE
<span class="doi">10.17487/RFC4920</span>
</li>

Referenced By