History
Most of the operators are using circuit switched technology as transport network. But most of the services are packet based services, so why not to use packet based networks to offer high bandwidth packet based services. The need of high bandwidth hungry application demands to upgrade the infrastructure. But the same time operators want to reduce their per bit infrastructure cost with minimal capex and opex involved. MPLS had already been deployed widely to offer packet based services, then why not to use MPLS as transport too. This was the reason to add T-MPLS (Transport MPLS) for transport services too. T-MPLS was subset of MPLS. T-MPLS discussion was initially started by ITU-T in 2006. At that time, ITU shown their interest to use the existing MPLS framework defined by IETF and incorporate all the MPLS functionalities in T-MPLS.