Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 2 / 2
Bert22306
User Rank
Author
re: Slideshow: Ethernet yesterday, today and tomorrow
Bert22306   5/29/2013 1:29:53 AM
NO RATINGS
Yes, that would be great. When I first encountered the spanning tree algorithm, I instantly recognized it as being the "minimal cost flow problem" described by Ford and Fulkerson.

rick merritt
User Rank
Author
re: Slideshow: Ethernet yesterday, today and tomorrow
rick merritt   5/29/2013 12:49:34 AM
NO RATINGS
Metcalfe and others at the event were clear only two things remain of the original Ethernet--the name and the packet format. As for spanning tree, no one mentioned prior art. I'll see if I can get Radia to chime in.

Bert22306
User Rank
Author
re: Slideshow: Ethernet yesterday, today and tomorrow
Bert22306   5/29/2013 12:14:43 AM
NO RATINGS
BTW, I was intrigued by the notion of "routing by name." Seems understandable enough that a name, assuming it's unique, is just as good an identifier as a 48-bit MAC address. My problem is, though, that unless names are carefully constructed, they will end up being just as un-hierarchical as MAC addresses are. Which makes actual "routing" a matter of every router having a list of all names. Hmmm.

Bert22306
User Rank
Author
re: Slideshow: Ethernet yesterday, today and tomorrow
Bert22306   5/28/2013 8:53:51 PM
NO RATINGS
Not to detract from the achievements of these smart people, but I don't think that this is the whole story. Necessarily. For example, what Metcalfe did was brilliant, but little of it survives in today's Ethernet. The format of the basic "type" frame, yes. The carrier sense and collision detect protocol, with backoff, not really. That's not how the Ethenets work anymore. Ethernets of today are actually much simpler. Just fire off those frames, and if there's a traffic jam at a merge point, put them in a queue. (And all sorts of more or less implemented schemes for prioriting frames in a queue, which are not really standardized.) If that original CSMA/CD protocol is used at all, it's only as a legacy protocol in a single host-switch interface. Does nothing to control traffic jams anymore. The spanning tree protocol, I studied that from a book called "Flows in Networks," L.K Ford and D.R. Fulkerson, where the initial edition was dated 1962. It was applied to Ethernet, later on when switches were used to tie together Ethernet links, true enough. And it works very well indeed. And Radia's book is a good read, humorous, and even engrossing. But how about those other two very smart people, back in 1962?

rick merritt
User Rank
Author
re: Slideshow: Ethernet yesterday, today and tomorrow
rick merritt   5/28/2013 7:44:37 PM
NO RATINGS
Got an Ethernet war story to add...or a poem?

<<   <   Page 2 / 2


Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Radio
LATEST ARCHIVED BROADCAST

What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.

Brought to you by:

Most Recent Comments
Like Us on Facebook
Special Video Section
The LTC3649 step-down regulator combines key features of a ...
Once the base layer of a design has been taped out, making ...
In this short video we show an LED light demo to ...
The LTC2380-24 is a versatile 24-bit SAR ADC that combines ...
In this short video we show an LED light demo to ...
02:46
Wireless Power enables applications where it is difficult ...
07:41
LEDs are being used in current luxury model automotive ...
With design sizes expected to increase by 5X through 2020, ...
01:48
Linear Technology’s LT8330 and LT8331, two Low Quiescent ...
The quality and reliability of Mill-Max's two-piece ...
LED lighting is an important feature in today’s and future ...
05:27
The LT8602 has two high voltage buck regulators with an ...
05:18
Silego Technology’s highly versatile Mixed-signal GreenPAK ...
The quality and reliability of Mill-Max's two-piece ...
01:34
Why the multicopter? It has every thing in it. 58 of ...
Security is important in all parts of the IoT chain, ...
Infineon explains their philosophy and why the multicopter ...
The LTC4282 Hot SwapTM controller allows a board to be ...
This video highlights the Zynq® UltraScale+™ MPSoC, and sho...
Homeowners may soon be able to store the energy generated ...