The MPLS WG Archive

[Robert Raszuk <raszuk@cisco.com>]

Hi Ray,

What you are describing is in fact very true. In can be caused by nature
of Internet or even by geographic/time zone characteristics of your
users.

That was also the reason why some providers has requested the ability to
dynamically redimention the configured LSPs (just build a new one with a
adjusted bw). Now this new bw value is taken from the averaged real
traffic rates flowing via such an LSPs. 

I don't think such an ability requires an IETF draft as the solution to
address this is pretty simple, is contained within a router itself and
can be enabled by just one knob.

R. 

> Raymond Law wrote:
> 
> For example, once an MPLS solution is deployed after a pre-deployment
> analysis or simulation which found an optimal LSP setup in which all LSPs
> have 50% utilization. If some LSPs have 80% utilization whereas other LSPs
> have 30% utilization in deployment.
> 
> Or, due to the dynamic nature of Internet traffic, some LSPs become
> congested while other LSPs are underutilized.  Maybe a LSP setup
> specifically for best effort traffic experience a large amount of traffic
> during the busy hours and that LSP become overutilized.
> 
> Does any drafts address this problem or has any solution been attempted or
> proposed in dealing with this issue?
> 
> Thanks.
> Ray,
> 
> At 06:54 PM 7/28/01 -0400, you wrote:
> >On Sat, Jul 28, 2001 at 04:02:37PM -0400, Raymond Law wrote:
> > > So has anyone looked into increasing the efficiency of LSP usage in a MPLS
> > > domain or is there any solution already out there?
> > >
> >
> >Define "efficient".  Then we can start talking about what the problem
> >may be, whether it needs to be solved, and how to solve it.
> >
> >
> >
> >eric
> >
> > > Thanks.
> > > Ray,
> > >
> > > At 03:58 PM 7/28/01 -0400, you wrote:
> > >
> > > >Of course there is.  It's called 'real world'.
> > > >
> > > >TE is a tool, but not everything in the world (or anywhere near to
> > that) is
> > > >always TE'ed.
> > > >
> > > >Any notion that MPLS LSP utilization is always efficient is ridiculous.
> > > >
> > > >On Sat, Jul 28, 2001 at 03:51:08PM -0400, Raymond Law wrote:
> > > > > What is the utilization of LSPs in a real MPLS domain?  It seems
> > that the
> > > > > LSP utilization should be efficient since the LSPs are configured
> > as such
> > > > > by traffic analysis and administrative means.  Is there a situation in
> > > > > which a LSP is overutilized and another LSP may be underutilized?
> > > > >
> > > > > Thanks.
> > > > > Ray,
> > > > >
> > > >
> > > >--
> > > >Christian Kuhtz <ck@arch.bellsouth.net> -wk, <ck@gnu.org> -hm
> > > >Sr. Architect, Engineering & Architecture, BellSouth.net, Atlanta, GA,
> > U.S.
> > > >"I speak for myself only.""