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Status:

PROPOSED STANDARD

Authors:

M. Meyer, Ed.
JP. Vasseur, Ed.

Stream:

IETF

Source:

mpls (rtg)

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DOI:  https://doi.org/10.17487/RFC5712

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Abstract

This document specifies Multiprotocol Label Switching (MPLS) TrafficEngineering Soft Preemption, a suite of protocol modificationsextending the concept of preemption with the goal of reducing oreliminating traffic disruption of preempted Traffic Engineering LabelSwitched Paths (TE LSPs). Initially, MPLS RSVP-TE was defined withsupport for only immediate TE LSP displacement upon preemption. Theutilization of a reroute request notification helps more gracefullymitigate the reroute process of preempted TE LSP. For the briefperiod soft preemption is activated, reservations (though notnecessarily traffic levels) are in effect under-provisioned until theTE LSP(s) can be rerouted. For this reason, the feature isprimarily, but not exclusively, interesting in MPLS-enabled IPnetworks with Differentiated Services and Traffic Engineeringcapabilities. [STANDARDS-TRACK]

For the definition ofStatus,seeRFC 2026.

For the definition ofStream, seeRFC 8729.