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Ç¥ÁعøÈ£ TTAE.IF-RFC5712 ±¸Ç¥ÁعøÈ£
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¿µ¹®Ç¥Áظí MPLS Traffic Engineering Soft Preemption
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¿µ¹®³»¿ë¿ä¾à In a Multiprotocol Label Switching (MPLS) Resource Reservation Protocol Traffic Engineering (RSVP-TE) (see [RFC3209]) enabled IP network, hard preemption is the default behavior. Hard pre-emption provides no mechanism to allow preempted Traffic Engineering Label Switched Paths (TE LSPs) to be handled in a make-before-break fashion: the hard preemption scheme instead utilizes a very intrusive method that can cause traffic disruption for a potentially large amount of TE LSPs. Without an alternative, network operators either accept this limitation, or remove functionality by using only one preemption priority or using invalid bandwidth reservation values. Understandably desirable features like TE reservation adjustments that are automated by the ingress Label Edge Router (LER) are less palatable when preemption is intrusive and maintaining high levels of network stability levels is a concern.
This document defines the use of additional signaling and maintenance mechanisms to alert the ingress LER of the preemption that is pending and allow for temporary control-plane under-provisioning while the preempted tunnel is rerouted in a non-disruptive fashion (makebefore-break) by the ingress LER. During the period that the tunnel is being rerouted, link capacity is under-provisioned on the midpoint where preemption initiated and potentially one or more links upstream along the path where other soft preemptions may have occurred.
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°ü·ÃÆÄÀÏ TTAE.IF-RFC5712.pdf TTAE.IF-RFC5712.pdf            

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