PCEP Extensions for SR-TE LSPs

This feature introduces extensions to Path Computation Element Protocol (PCEP) to support management of segment routing- traffic engineering (SR-TE)-based LSPs for a Path Computation Element (PCE). Setting up of SR-TE LSPs through an external PCE provides a global view of per-LSP, per-device bandwidth demand on the network, enabling online and real-time constraint-based path computation. The advantages of segment routing are extended to the SR-TE LSPs initiated by a PCE, augmenting the benefits of external path computing in an MPLS network. A Path Computation Client (PCC) with delegation capability can take back control of the delegated SR-TE LSPs from the PCE when the PCEP session goes down, which would otherwise be deleted from the PCC. You can thereby benefit from SR-TE LSP protection by eliminating a traffic null-route condition.