UDP as Transport Protocol for PCECP
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The Path Computation Element Communication Protocol defines a
request/response protocol used for the communication between a Path
Computation Client (PCC) and a Path Computation Element (PCE), or
between two PCEs. PCEP employs Transmission Control Protocol (TCP) as
the transport layer protocol by using a registered TCP port. This
document proposes the possibility of employing UDP as the transport
layer protocol instead of TCP. UDP is a connectionless protocol
within TCP/IP protocol suite that corresponds to the transport layer
in the ISO/OSI reference model. UDP converts data messages generated
by an application into packets to be sent through IP. The reliability
is not guaranteed by UDP and should be ensured by the application that
generates the data message. The PCECP application is flexible to
ensure the reliability of PCECP messages. This document explains on
how the reliability of the PCECP messages can be achieved by means of
PCECP, while operating PCECP over UDP.