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Luis Sanchez
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New versions for everything?
Luis Sanchez   8/30/2013 11:45:59 AM
I think the big changes are really imposed by breaking technologies. Perhaps we can say, by new hardware. 

How much of an improvement could be achieved with small tweaks here and there? 

Can a soft topology/architechture change really make a big impact?

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Optical transceiver can use cable?
clayman   8/29/2013 8:24:50 PM
I don't know the following desciption:

100G new OPTICAL tranceiver uses 10G CABLE?  Maybe the cable is fiber?

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Small Switches...
Charles.Desassure   8/27/2013 6:41:30 AM
Small switches sound like an excellent idea for the networking environment.   If successful, it should help LAN Administrators with the task of solving network problems quickly.

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Re: OpenFlow in transition
LarryM99   8/26/2013 1:03:06 PM
It seems like they are trying to move enterprise networks from being general-purpose superhighways to being application-specific feeder roads. This may make sense in some specific applications, but it seems like there is a danger to making them too specific to particular applications which will change over time. SDNs are supposed to do that, but by allocating network resources at a software level which can adapt and change over time.

The argument for this is that enterprise applications don't change often. Unfortunately, baking the details into your network design is one way of ensuring that that description becomes even more self-fulfilling.

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Re: OpenFlow in transition
Kinnar   8/26/2013 5:47:50 AM
As per the talk of Tom Edsall from Insieme Networks it seem that they might be introducing or coming up with a solution of the described problem, may it will be a new uncovered protocol may grew up.

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Re: Don't like fat trees
KB3001   8/25/2013 6:28:23 AM
@Bert22306, the centralised control in the porposed SDN is meant to adapt against failures such as the ones you describe, but also to different App-specific traffic demands.

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Don't like fat trees
Bert22306   8/23/2013 5:59:01 PM
I'm not sure I understand what these "app-savvy switches" are really being asked to do, but I've always stayed away from any of these "fat tree" topologies, in my work.

Almost always, when I hear keynotes like this one, I know that I'm missing some key concept that the speaker has in mind. This would be no exception. Whether this key concept is generically applicable to networks, or whether it only applies to data centers, therefore escapes me.

My inclination has always been to design networks with many small switches, well distributed, in as dense a mesh as one can afford. This offers short paths between any two hosts and no prossibility of one or two switch failures creating a major catastrophy.

rick merritt
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OpenFlow in transition
rick merritt   8/23/2013 2:31:46 PM
Interestingly both Edsall and a Googler who keynoted the day before (see link below) said protocols are still in an early definiton stage and OpenFlow is more of a starting point than a key piece of the SDN implementation.

2013-08-21Slideshow: Tour Google's Software Defined Net

As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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