Path computation element

Path computation element

Routing is the process of finding a suitable route for conveying data between a source and one or a set of destination. Routing can be subject to a set of constraints, like QoS, policy, or price. Constraint-based path computation is a strategic component of traffic engineering in MPLS and GMPLS networks. It is used to determine the path through the network that traffic should follow, and provides the route for each Label Switched Path (LSP) that is set up.

Path computation has previously been performed either in a management system or at the head-end of each LSP. But path computation in large, multi-domain networks may be very complex and may require more computational power and network information than is usually available at a network element, yet may still need to be more dynamic than can be provided by a management system.

A Path Computation Element (PCE) is defined by the Internet Engineering Task Force (IETF) in "RFC 4655" RFC 4655, [http://www.ietf.org/http://www.ietf.org/rfc/rfc4655.txt "A Path Computation Element (PCE)-Based Architecture"] ] , as

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

Thus, a PCE is an entity capable of computing complex paths for a single or set of services. A PCE might be a network node, network management station, or dedicated computational platform which is aware of the network resources and has the ability to consider multiple constraints for sophisticated path computation. PCE applications include computing Label Switched Paths for MPLS and GMPLS Traffic Engineering. The various components of the PCE architecture are in the process of being standardized by the IETF's "PCE Working Group"IETF's Working Group, [http://www.ietf.org/html.charters/pce-charter.html "Path Computation Element (pce)"] ] .

PCE represents a modern vision of networks where route computations should more or less be separated from actual packet forwarding.

References

pecifications

* http://www.ietf.org/html.charters/pce-charter.html

External links

* [http://www.pathcomputationelement.com Path Computation Element Resource Site]


Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • Routing — This article is about routing in networks. For other uses, see Routing (disambiguation). Routing is the process of selecting paths in a network along which to send network traffic. Routing is performed for many kinds of networks, including the… …   Wikipedia

  • Adrian Farrel — is a co chair of three IETF working groups, namely CCAMP ,IETF s Working Group, [http://www.ietf.org/html.charters/ccamp charter.html Common Control and Measurement Plane (ccamp) ] ] PCE IETF s Working Group,… …   Wikipedia

  • PCE — may stand for: In business and economics: Personal consumption expenditure (or Private consumption expenditure ) Personal consumption expenditures price index In organizations: Parliamentary Commissioner for the Environment, New Zealand… …   Wikipedia

  • Network planning and design — is an iterative process, encompassing topological design, network synthesis, and network realization, and is aimed at ensuring that a new network or service meets the needs of the subscriber and operator.[1] The process can be tailored according… …   Wikipedia

  • PCE — Die Abkürzung PCE steht für: PC Engine (8 Bit Spielekonsole der Firma NEC) Partido Comunista de España (Kommunistische Partei Spaniens) Partido Comunista del Ecuador (Kommunistische Partei Ecuadors) Partido Conservador Ecuatoriano… …   Deutsch Wikipedia

  • PCE — Partido Comunista de España (International » Spanish) ** Personal Consumption Expenditures (Community » Religion) * Personal Consumption Expenditure (Governmental » Transportation) * Passenger Car Equivalents (Governmental » Transportation) *… …   Abbreviations dictionary

  • Monad (functional programming) — In functional programming, a monad is a programming structure that represents computations. Monads are a kind of abstract data type constructor that encapsulate program logic instead of data in the domain model. A defined monad allows the… …   Wikipedia

  • physical science, principles of — Introduction       the procedures and concepts employed by those who study the inorganic world.        physical science, like all the natural sciences, is concerned with describing and relating to one another those experiences of the surrounding… …   Universalium

  • List of terms relating to algorithms and data structures — The [http://www.nist.gov/dads/ NIST Dictionary of Algorithms and Data Structures] is a reference work maintained by the U.S. National Institute of Standards and Technology. It defines a large number of terms relating to algorithms and data… …   Wikipedia

  • Список терминов, относящихся к алгоритмам и структурам данных —   Это служебный список статей, созданный для координации работ по развитию темы.   Данное предупреждение не устанавливается на информационные списки и глоссарии …   Википедия

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”