openconfig-pcep

Organization:

OpenConfig working group

Module:

openconfig-pcep

Version:

2022-02-11

File:

openconfig-pcep.yang

Abstract:

This module defines configuration and operational state data relating to Path Computation Element Protocol (PCEP) for communicat...

Contact:

OpenConfig working group
www.openconfig.net

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Description:

This module defines configuration and operational state data
relating to Path Computation Element Protocol (PCEP) for communications
between a network element (router) acting as PCC and a PCE server,
according to RFC4655 definitions:

-PCC: Path Computation Client; any client application requesting a
path computation to be performed by a Path Computation Element.

-PCE: Path Computation Element; 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.

Also according to RFC4655, a PCE can be either stateful or
stateless. In the former case, there is a strict synchronization
between the PCE and not only the network states (in term of
topology and resource information), but also the set of computed
paths and reserved resources in use in the network. Conversely,
stateless PCEs do not have to remember any computed path and each
set of request(s) is processed independently of each other. For
example, stateless PCEs may compute paths based on current TED
information, which could be out of sync with actual network state
given other recent PCE-computed paths changes.

On the other hand, RFC8051 defines for Stateful PCE two modes of
operation:

-Passive Stateful PCE: a PCE that uses LSP state information
learned from PCCs to optimize path computations. It does not
actively update LSP state. A PCC maintains synchronization with
the PCE.

-Active Stateful PCE: a PCE that may issue recommendations to
the network. For example, an Active Stateful PCE may use the
Delegation mechanism to update.

LSP parameters in those PCCs that delegate control over their LSPs to
the PCE.