The MPLS WG Archive

[Senthilkumar Rajasekharan <senthil@caip.rutgers.edu>]

Hi Hansen,

> 
> Yes, many (perhaps most) contemporary implementations perform
> LSP path computations online. This is a mandatory requirement

The following link has a description of an online LSP computation
mechanism ....
http://www.bell-labs.com/user/suter/rates.ps.gz
 
-Senthil


> in some operational contexts. It's also possible to augment
> the online system with offline software tools.
> 
> Cheers,
> /Dan
> 
> On Thu, Apr 20, 2000 at 06:04:13PM -0400, HANSEN CHAN wrote:
> > Dan,
> > 
> > To make sure I understand. Do you mean the path of LSPs is computed on the
> > node, not by software tools?
> > 
> > Thanks,
> > Hansen
> > 
> > Daniel Awduche wrote:
> > 
> > > Actually, the original assertion/generalization is false
> > > (i.e. that "LSPs in today's MPLS network are usually computed
> > > off-node").
> > >
> > > Cheers,
> > > /Dan
> > >
> > > On Thu, Apr 20, 2000 at 02:08:22PM -0400, Anoop Ghanwani wrote:
> > > >
> > > >
> > > > > I am trying to understanding the use of TE extension of IGP in a MPLS
> > > > > network. From my understanding, you need TE extension when you're doing
> > > > > on-node path computation. However, since LSPs in today's MPLS network
> > > >                                                    ^^^^^^^^^^^^^^^^^^^^
> > > >
> > > > We're hoping it won't stay that way forever because it's limiting
> > > > to have to rely on offline tools for all traffic engineering :-)
> > > >
> > > > That means that traffic engineering would need to be more dynamic,
> > > > and the routers would play a more active role in determining paths
> > > > and possibly doing network optimization.  Hence the IGP extensions.
> > > >
> > > > > are usually computed off-node (in software tool), why would the use of
> > > > > TE extension be critical?
> > > > >
> > > > > Appreciate if someone can shed some light on this question.
> > > >
>