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A label switching router (LSR) makes up the core of a label-switched network. Label-switched networks are made up of predetermined paths, called label-switched paths, (LSPs) which are the result of establishing source-destination pairs by the process called Multi-Protocol Label Switching (MPLS). Label switching routers support MPLS, which ensures that all of the packets carried in a specific route will remain in the same path over a backbone.
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