1. MPLS-TE mechanisms

The MPLS-TE (MPLS Traffic Engineering) mechanism enables the establishment of MPLS LSPs (Label Switched Paths), explicitly routed according to traffic constraints (bandwidth, etc.) and available network resources. These MPLS LSPs are known as TE-LSPs or MPLS-TE tunnels. MPLS-TE constraint routing is based on a function for discovering the bandwidth that can be reserved on the links, provided by an extended link-state routing protocol (ISIS-TE: Intermediate System to Intermediate System-TE or OSPF-TE: Open Shortest Path First-TE), a function for calculating the explicit constrained path, taking into account the tunnel's TE constraints (bandwidth, elements to be included/excluded, etc.) and the resources available on the network..)...