PCEP
306
MPLS Guide
© 2022 Nokia.
Use subject to Terms available at: www.nokia.com
3HE 18686 AAAB TQZZA
4.1 Introduction to the Path Computation Element
(PCE) Communication Protocol (PCEP)
The Path Computation Element Communication Protocol (PCEP) is one of several
protocols used for communication between a wide area network (WAN) software-
defined network (SDN) controller and network elements.
The Nokia WAN SDN Controller is known as the Network Services Platform (NSP).
The NSP is a set of applications which are built on a common framework that hosts
and integrates them by providing common functions. The applications are developed
in a Java environment.
The NSP provides two major functions:
• programmable multi-vendor service provisioning
• network resource control, including resource management at Layer 0 (optical
path), Layer 1 (ODU path), Layer 2 (MPLS tunnel), and at the IP flow level
The network discovery and control function implements a common set of standards-
based southbound interfaces to the network elements for both topology discovery
and tunnel and flow programming. A virtual SR OS (vSROS) image applies the
southbound interfaces to the network elements and the adaptation layer to the
applications. The southbound interfaces include IGP and the Network Functions
Manager - Packet (NSP NFM-P) for topology discovery, PCEP for handling path
computation requests and LSP state updates with the network elements, and
forwarding plane programming protocols such as OpenFlow, BGP flowspec, and
I2RS.
The above NSP functions are provided in a number of modules that can be used
together or separately as illustrated in Figure 16.
Note: The 7705 SAR operates as a PCE Client (PCC) only, supporting PCC capabilities for
RSVP-TE LSPs and SR-TE LSPs. References to PCE router operation apply to the 7750
SR product family and are included for informational purposes only.
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