Re: [manet] New definition of term 'TLV' in PacketBB

[Thomas Clausen <Thomas.Clausen at polytechnique.fr>]

Alex,

I appreciate your reviewing of the MANET WG specs.

Generally, I think that it might be advantageous if you try to  
understand WHY the specs are the way they are, rather than to launch  
into observing a difference with some other similar mechanism and  
then taking this as an indication that something is broken.

TLVs, for example, are TLVs, with the addendum of specifying "to  
which entities they apply". This is necessary since it allows doing  
efficient address aggregation. The alternative -- naive TLVs without  
such information -- would lead to a much less efficient address  
aggregation. (Notice that this is a simplified description, but that  
it should get the point through)

Since one of the MANET wg's design-dogmas is "efficient when  
sensible", many such trade-offs have been considered and discussed  
over the years, and packetbb reflects the result of a number of such  
discussions.

Thomas

On Jun 19, 2007, at 4:11 PM, Alexandru Petrescu wrote:

> Dearlove, Christopher (UK) wrote:
> > > I think the term TLV (type-length-value) is overloaded by the
> > > PacketBB
> > spec:
> > There are many uses of TLV in many places. Some are simple, some are
> > more complicated. This one does the job it's intended to do.
>
> But it's different than what rfc2460 calls a 'TLV'.
>
> > You actually can't do that job with just a type, a length and a value
> > as you then couldn't apply information to just some of the addresses
> > in an address block. And that's essential.
> > I'm afraid I don't find this particular criticism constructive, so
> > I'm not going to discuss this point further.
>
> Ok, I again went into MANET document debugging instead of  
> contending just reading them :-( Generally speaking, I don't think  
> it's constructive to ignore existence of already defined TLV  
> mechanisms, address encoding mechanisms and code availability.
>
> Alex
>
>
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--
Thomas Clausen
Thomas.Clausen at polytechnique.fr
http://www.lix.polytechnique.fr/Labo/Thomas.Clausen/
http://www.lix.polytechnique.fr/hipercom/






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