Re: [mpls-linux-general] basic questions about MPLS.

[Folke A. <aeo...@ho...>]

in my opinion, the basic distinction between mpls
and ip is that mpls is in layer 2.5 (a layer between
the link layer and ip layer). but more technically,
mpls is link-oriented switching technology, and ip
is NOT link-oriented, which means that in ip network,
you always gets a opsf routing protocol to route your
packets, which mean that all packets will always
intend to route from source to destination along
the shortest path (which normally computed by
dijkstra algorithm ), which will intend to cause
congestion.

  but in mpls network, which is a link oriented
network, you can setup a pre-routed link between
the source and the destination, and indeed , you
can setup multi-links. thus you can do
load-balance on all these links, which will
avoid traffic congestion.

  that's what i know :-), and wish it could do
some help.

  advice you to read the following for more technical
info.:
rfc2702(Requirements for Traffic Engineering Over MPLS)
rfc3031(Multiprotocol Label Switching Architecture)
rfc3037(LDP Applicability)
rfc3209(extensions to rsvp for lsp tunnels)
rfc3212(Constraint-Based LSP Setup using LDP)
rfc3270(MPLS Support of Differentiated Services)

you can get them at :
http://www.ietf.org/rfc/rfcNNNN.txt

where NNNN is the RFC number prefixed
with zeroes as necessary to make a four
digit number.

have fun :)



folke

>
>Message: 2
>Date: Mon, 25 Nov 2002 12:48:59 -0500 (EST)
>From: Ramesh Masavarapu <ra...@bo...>
>To: mpl...@li...
>Subject: [mpls-linux-general] basic questions about MPLS.
>
>
>Hi,
>   I would apprecitate if someone could help me why MPLS is being used?I am
>lost as to where i could find descent enough information about this.
>And if someone could explain me what major advantages MPLS has (in
>comparison with techniques used in IP ,for e.g in the area of traffic
>engineering), i would appreciate it a lot.
>The questions i asked may sound dumb , but i am new to MPLS and would
>appreciate any kind of help .
>
>thanks in advance
>-Ramesh Masavarapu



_________________________________________________________________
Help STOP SPAM with the new MSN 8 and get 2 months FREE*  
http://join.msn.com/?page=features/junkmail