IGP-TE and MPLS Constraint Based Routing, any takers ? (Was: RE: [ns] Manual routing)

[Florian-Daniel Otel <otel@ce.chalmers.se>]

All,

Browsing through the archives found signs of feeble attempts but 
mostly (surprise-surprise) questions  about IGP-TE (traffic engineering
extensions to IGPs) and Constraint-Based Routing in MPLS domains. 

For some time now I'm digging thorugh ns code trying to figure out how
to extend the existing rtProtoLS (as a "link-state IGP") to include
the TrafficEngineering extensions as a first base to implement
Constraint-Based Routing in MPLS.  Then try to see how can that be
combined w/ the existing code for network dynamics and scenario
generator to simulate random failures/reroutings  in large domains.

Needless to say this would mean touching quite a bit of code: Implementing
link bandwidth reservation and extending the existing CR-LDP code
comes first to mind.

My questions to the list:

-First and foremost, is there anybody out there working on this ? I
_really_  don't like to reinvent the wheel unless I have to. Send the
reply to me directly to avoid spraying the whole list. 

-Second (and this is for the main ns developers) are there any plans
to touch these areas  ? (Just checking....)

-Third and the last: Any suggestions on how to do this in a sane manner ?
The way things are in ns is it _really_ a good idea to extend
rtProtoLS or I'll be better off implementing a new route logic from ground
up under RtModule/MPLS? (Again, I'm intrested in MPLS domains
_only_. AFAIU hierarchical domains are also out of the question)

Any (informed) suggestions or ideas are warmly welcomed,

Florian


> Hi,
> Some kind of source routing is implemented in our Active QoS Routing code:
> http://www.tk.uni-linz.ac.at/~micky/AQR.html

> I call it "some kind of ..." because it uses agents to forward the packets
> accordingly - which makes sense for routing simulations such as the ones
> we did. You could also use it for QoS routing in ad hoc networks. But all
> forwarding nodes need to be AQR agents, which is pretty limiting.

> Cheers,
> Michael


>> -----Original Message-----
>> From: owner-ns-users@ISI.EDU
>> [mailto:owner-ns-users@ISI.EDU]On Behalf Of
>> Debojyoti Dutta
>> Sent: Wednesday, May 16, 2001 7:49 PM
>> To: bfslim@netcourrier.com
>> Cc: ns-users@ISI.EDU
>> Subject: Re: [ns] Manual routing
>> 
>> 
>> Are you talking about source routing ? You just have to wait
>> for some time
>> ... NS doesnt have source routing enabled as yet.
>> 
>> Debo
>> 
>> On Wed, 16 May 2001 bfslim@netcourrier.com wrote:
>> 
>> > Hi,
>> >
>> > I have a problem configuring manual routes : how can we
>> declare a default route from node A to node B passing through
>> node C ?
>> > I saw this question (formulated in different ways) several
>> times on this mailing-list, but so far no satisfactory answer
>> has been provided.
>> > Thanks you so much helping me,
>> >
>> > Slim.
>> >
>> > ----- La messagerie itin�rante sans abonnement NetCourrier -----
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>>