A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : LSP Preemption Policies for MPLS Traffic Engineering
Author(s) : J. de Oliveira, et al.
Filename : draft-deoliveira-diff-te-preemption-05.txt
Pages : 21
Date : 2006-5-8
When the establishment of a higher priority (Traffic Engineering
Label Switched Path) TE LSP requires the preemption of a set of lower
priority TE LSPs, a node has to make a local decision to select which
TE LSPs will be preempted. The preempted LSPs are then rerouted by
their respective Head-end Label Switch Router (LSR). A preempted TE
LSP can either be hard preempted or soft preempted. In the former
case, the preemption results in clearing the corresponding state and
may cause traffic disruption. In the later case, the Head-end LSR of
a soft-preempted TE LSP is notified such that it can perform a non-
disruptive reroute, using the "make before break" mechanism. This
document presents a flexible policy that can be used to achieve
different objectives: preempt the lowest priority LSPs; preempt the
minimum number of LSPs; preempt the set of TE LSPs that provide the
closest amount of bandwidth to the required bandwidth for the
preempting TE LSPs (to minimize bandwidth wastage); preempt the LSPs
that will have the maximum chance to get rerouted. Simulation
results are given and a comparison among several different policies,
with respect to preemption cascading, number of preempted LSPs,
priority, wasted bandwidth and blocking probability is also included.
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