In the article a transition is examined from IP-networks to MPLS without the change of cable infrastructure. As a criterion of expediency of replacement of routers in IP-network on the equipment MPLS time of delay transmission of packages is examined. The shown out analytical dependences demonstrate, that technology MPLS by comparison to IP has a row of advantages that increase with the level work-load of network. The mathematical vehicle presented in the article allows to conduct the border of demarcation on the criterion of time of delivery of packages between transport networks.
telecommunication network, IP- network, routing, MPLS technology