Juliusz Chroboczek wrote:
"The inclusion of physical layer characteristics including bandwidth,
loss, and latency in path computation should be considered for
optimising communication in the homenet."
Should the text then rather say "Path selection in Homenet needs to be
more sophisticated than measuring pure hop count due to the use of
heterogeneous link technologies, and therefore the routing protocol should
be capable of utilising multiple link-dependent metrics, such as
bandwidth, delay, and link reliability", rather than mentioning
"optimised"?
I'm happy with either. The current text leaves it to the protocol people
to decide what "optimising" means, but I also like the way you spell out
the requirement. If you'll allow me to indulge in some minor nit picking
wrt. your suggested wording:
- you require "multiple [...] metrics", which is what we do in Babel, but
we certainly don't wish to prevent somebody from being smart enough to
design a single metric that works satisfactorily on all link layers;
- you use "bandwdith" where you mean "throughput" (yeah, I know, I'm
a pedant);
- I'm on a personal crusade against the utilisation of the verb "to utilise".
So perhaps something like:
Due to the use of heterogeneous link technologies, path selection in
a homenet needs to be more refined than minimising hop count. The
homenet routing protocol should be able to select paths according to
criteria such as latency, throughput, link reliability (e.g. measured
packet loss) or other performance metrics.
-- Juliusz
I could certainly live with your text, and if the WG ever moved to
evaluating competing candidate routing protocols against requirements
derived from the architecture, it could provide a useful and objective
differentiator, which is possibly something that has been lacking up
until now. e.g. {BABEL, EIGRP, full IS-IS .....} might be preferred
over {OSPFv3....} which might be preferred over {RIPng, HNCP native
routing, IS-IS (only using cost and default cost=10) , AODV (without
link quality extensions) ....} on this particular measure of suitability.
--
Regards,
RayH
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