CHAPTER 23
Configuring Path Computation Element
Protocol (PCEP)
•
PCEP Overview on page 691
•
Configuring PCEP on page 707
PCEP Overview
•
PCEP Overview on page 691
•
Support of the Path Computation Element Protocol for RSVP-TE Overview on page 692
PCEP Overview
A Path Computation Element (PCE) is an entity (component, application, or network
node) that is capable of computing a network path or route based on a network graph
and applying computational constraints. A Path Computation Client (PCC) is any client
application requesting a path computation to be performed by a PCE. The Path
Computation Element Protocol (PCEP) enables communications between a PCC and
a PCE, or between two PCEs (defined in RFC 5440).
PCEP is a TCP-based protocol defined by the IETF PCE Working Group, and defines a
set of messages and objects used to manage PCEP sessions and to request and send
paths for multidomain traffic engineered LSPs (TE LSPs). It provides a mechanism for
a PCE to perform path computation for a PCC’s external LSPs. The PCEP interactions
include LSP status reports sent by the PCC to the PCE, and PCE updates for the external
LSPs.
Figure 36 on page 692 illustrates the role of PCEP in the client-side implementation of a
stateful PCE architecture in an MPLS RSVP-TE enabled network.
691Copyright © 2017, Juniper Networks, Inc.
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