Basics of the PCEP protocol
Path Computation Element – Bringing the WAN to the SDN era

The PCEP protocol is based on TCP, which provides error recovery and flow control. It is described in RFC 5440 . The server listens for connections on port 4189.

Once the TCP connection has been established, the PCEP protocol begins an initialization phase in which the two parties exchange information via the OPEN message, in particular the capacities supported by each party (figure 9 ). As the PCEP protocol continues to evolve, it is necessary to negotiate the options to be used. Figure 10 shows an example...