Re: [Roll] ETX metric

[Philip Levis <pal at cs.stanford.edu>]

On Oct 15, 2009, at 12:49 PM, Alexandru Petrescu wrote:

> Philip Levis a écrit :
> > On Oct 15, 2009, at 12:27 PM, Alexandru Petrescu wrote:
> > > Philip Levis a écrit :
> > > > I think we should keep in mind that RPL must work across multiple  
> > > > link layers. E.g.:
> > > > A -- 900MHz --> B -- 2.4GHz --> C
> > > > ETX is a commonly used metric,
> > >
> > > Philip, what do you mean by "ETX commonly used metric"?
> > >
> > > Could you please explain, in implementation terms.
> > >
> > > Could you list some widely available software in solid software  
> > > distributions, widely deployed, and using this ETX metric?
> > MIT Roofnet/srcr: http://pdos.csail.mit.edu/roofnet/software.php
> > CTP: http://tinyos.cvs.sourceforge.net/viewvc/tinyos/tinyos-2.x/tos/lib/net/ctp/
> > OLSR: http://www.olsr.org/docs/README-Link-Quality.html
>
> Ah the World Wide Web, h t t p something, wikipedia and google and  
> we know everything...
>
> The software being on a website doesn't tell anything about how much  
> it is used.
>
> How about software which is not on h t t p something yet it runs ok.

Meraki's technology is based on srcr (the Roofnet students from MIT  
founded Meraki). Not an IETF standard, but a mesh protocol running on  
13,000+ networks, serving >4,000,000 clients. Srcr uses ETX/ETT. Sorry  
for the http, it's to their web page, not the source code:

http://meraki.com

Phil