MPLS-based recovery

[摘要] ENGLISH ABSTRACT: MPLS-based recovery is intended to effect rapid and complete restoration of traffic affected by a faultin a Multiprotocol Label Switching (MPLS) network. Two MPLS-based recovery models have beenproposed: lP re-routing which establishes recovery paths on demand, and protection switching whichworks with pre-established recovery paths. lP re-routing is robust and frugal since no resources arepre-committed but it is inherently slower than protection switching which is intended to offer highreliability to premium services where fault recovery takes place at the 100 ms time scale.This thesis presents an overview of various recovery techniques and addresses the problem of how tofind an in some sense optimal set of pre-established traffic engineered recovery paths, given a networkwith link capacities and traffic demands.We present and motivate our choice of a nonlinear objective function and optimization method forfinding traffic engineered working and recovery paths. A variant of the flow deviation method is usedto find and capacitate a set of optimal label switched paths. We present and evaluate two simplemethods for computing a set of pre-established traffic engineered recovery paths by using the flowdeviation method.

[发布机构] Stellenbosch University