Multiprotocol Label Switching (MPLS)

Avui a la classe de Projectes ens ha vingut una empresa q es diu Unitronic a
fer una xerrada, a part de la típica propaganda ens han parlat d’un
protocol d’enrutament multinivell molt usat per les operadores actualment. Fa
temps q havia sentit a parlar d’ell, però mai m’havia mirat de q
anava…

Doncs bé, després d’aquesta breu introducció m’ha picat
la curiositat investigar una mica més sobre el MPLS, així doncs
he trobat una bona i curta definició del mateix:

Multiprotocol label switching (MPLS) is a versatile solution to address the
problems faced by present-day networks-speed, scalability, quality-of-service
(QoS) management, and traffic engineering. MPLS has emerged as an elegant
solution to meet the bandwidth-management and service requirements for
next-generation Internet protocol (IP)-based backbone networks. MPLS addresses
issues related to scalability and routing (based on QoS and service quality
metrics) and can exist over existing asynchronous transfer mode (ATM) and
frame-relay networks.

Aquesta definició l’he trobat a les transparències de MPLS de la
www.iec.org, exactament a la URL:
http://www.iec.org/tutorials/mpls/index.html

Finalment he mirat el tema RFCs sobre les MPLS i he trobat:

RFC2547: BGP/MPLS VPNs

This document describes a method by which a Service Provider with an

IP backbone may provide VPNs (Virtual Private Networks) for its

customers. MPLS (Multiprotocol Label Switching) is used for

forwarding packets over the backbone, and BGP (Border Gateway

Protocol) is used for distributing routes over the backbone. The

primary goal of this method is to support the outsourcing of IP

backbone services for enterprise networks. It does so in a manner

which is simple for the enterprise, while still scalable and flexible

for the Service Provider, and while allowing the Service Provider to

add value. These techniques can also be used to provide a VPN which

itself provides IP service to customers.

RFC2702: Requirements for Traffic Engineering Over MPLS

This document presents a set of requirements for Traffic Engineering

over Multiprotocol Label Switching (MPLS). It identifies the

functional capabilities required to implement policies that

facilitate efficient and reliable network operations in an MPLS

domain. These capabilities can be used to optimize the utilization of

network resources and to enhance traffic oriented performance

characteristics.

RFC2917: A Core MPLS IP VPN Architecture

This memo presents an approach for building core Virtual Private

Network (VPN) services in a service provider’s MPLS backbone. This

approach uses Multiprotocol Label Switching (MPLS) running in the

backbone to provide premium services in addition to best effort

services. The central vision is for the service provider to provide a

virtual router service to their customers. The keystones of this

architecture are ease of configuration, user security, network

security, dynamic neighbor discovery, scaling and the use of existing

routing protocols as they exist today without any modifications.

Segur q hi ha molts més RFCs i documentació sobre el tema,
però degut a q la xarxa del pis esta en remodelació ja q tinc als
dos coleguilles jugant amb els servers i el firewall no he pogut seguir buscant
informació i per tant de moment acabo l’article aquí.

IP CBQ,QOS,TOS… Advanced routing.

Després d’un dia molt extrany on seria difícil definir tot el
q he fet, m’he decidit a publicar aquest recull de direccions sobre el temes
d’enrutament avançat.

Vist la poca documentació i que només hi ha un document
oficial realment interessant sobre el tema de l’enrutament avansat en Linux, he
decidit buscar recursos d’aquest tipus pel google i d’altres fonts. La
veritat és q és un tema amb molta teoria i poques implementacions
tan a nivell comercial com a nivell open-source. Ara només necessito
temps per llegir-m’ho tot una mica i fer-ne un resum.

DiffSpec:
http://qos.ittc.ukans.edu/diffspec_report.html

Transparencies de IP QOS:
http://www.belug.org/~kranz/ip-qos.pdf

Introduction to Linux Advanced Routing and Traffic Management:
http://www.ceenet.org/workshops/lectures2000/Rafal_Maszkowski/routing-traffic

DiffServ:
http://icawww1.epfl.ch/linux-diffserv

KIDS:

http://www.telematik.informatik.uni-karlsruhe.de/forschung/diffserv/KIDS

ITT Center U.Kansas:
http://qos.ittc.ukans.edu

RSVP:
ftp://ftp.sunet.se/pub/os/Linux/ip-routing/rsvp

IPROUTE2 + TC:
ftp://ftp.inr.ac.ru/ip-routing

A Study of IP QoS:
http://www.ittc.ukans.edu/~iyer/Table_of_Contents.html

Linux – Advanced Networking Overview Version 1:

http://qos.ittc.ukans.edu/howto/index.html

Netlink Sockets – Overview:
http://qos.ittc.ukans.edu/netlink/html/index.html

Linux QoS Support (transparències):
http://www.ittc.ukans.edu/~rsarav/projects/networking/ipqos/diffoverview/inde

x.htm

Expedited Forwarding Per-Hop-Behaviour
http://www.ittc.ukans.edu/~sarin/845/

Policy based routing MICRO-HOWTO
http://www.starshine.org/tag/policy-routing.txt

Xerrada sobre politiques de rutat per “Horacio Peña” a l’UMEET
2000
http://umeet.uninet.edu/conferencias/11-12-2000/1112linux.en.html

RFCs
====

Resource Reservation Protocol RFC2205
The Use of RSVP with IETF Integrated Services RFC2210
An architecture for differentiated service RFC2475
DS Field RFC2474