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dlr5288
dlr5288
7/31/2016 5:33:45 PM
User Rank
Platinum
Re: Common sense wins out over human perception
I was having a bit of a hard time understanding this myself. However, I tink it's a good idea and the offices will have more of a flow to them.

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JohnBarnes
JohnBarnes
7/31/2016 4:08:39 PM
User Rank
Platinum
Re: Common sense wins out over human perception
freehe,

The second article does raise a good point: the fewer connections, the fewer places you need to implement checkpoints for security. Traditional architecture had many fewer connections so you only needed a few checkpoints, and big parts of the system could readily be isolated. Leaf and spine needs many more checkpoints for the same degree of security.  By the same token you only needed a cop at each station and one on the train for railroad security, compared to large numbers of police and a whole patrol schedule for a highway system -- but nobody really wants to go back to railroads now that you can drive where you want when you want. Security for leaf-spine will be made to work, because users and IT are going to want leaf-spine to work.

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freehe
freehe
7/31/2016 2:34:01 PM
User Rank
Platinum
Re: Common sense wins out over human perception
Another name for leaf-spine design is distributed core. Fabric is another name for the network.

In the leaf/spine model must consider port density per rack and oversubscription.

Leaf/spine helps use are available network links that exist between devices at the same time. User demand for more connections to devices and data capacity has increased the user of leaf/spine designs.

Planning and design or cables can become complex and costly. Protocol restricutinos limits networking tools that can be used.

Leaf/spine is used by companies because it is fast and easily scalable.

I found a picture of a leaf/spine image

https://images.duckduckgo.com/iu/?u=http%3A%2F%2Fi1.wp.com%2Fviodi.com%2Fwordpress%2Fwp-content%2Fuploads%2F2013%2F05%2Fleaf-spine-for-network-virtualization.png&f=1

Here is an explanation

http://blog.ipspace.net/2014/04/security-in-leaf-and-spine-fabrics.html

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freehe
freehe
7/31/2016 2:21:45 PM
User Rank
Platinum
Re: Common sense wins out over human perception
JohnBarnes, thanks for the definition.

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faryl
faryl
7/23/2016 10:25:54 PM
User Rank
Platinum
Re: Common sense wins out over human perception
Am I understanding the achitecture correctly that the leaf-to-spine connection is a physical one (i.e., a cable is used to connect the leaf to the spine)? If so, is that as complex (or at least a PITA) to set up as I'm thinking it is?

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JohnBarnes
JohnBarnes
7/23/2016 9:35:52 PM
User Rank
Platinum
Common sense wins out over human perception
I confess I had to go look up the leaf-spine topology versus the more traditional tree structure.  And two things are really striking:

1) path lengths through leaf-spine are much shorter than through trees, and max path length is sharply limited

2) Leaf-spine is really, really hard to draw clearly and to message-trace!

Wonder how many other features of todays systems are there because 50 years ago it was easier to draw them with a felt pen on a napkin?

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Mike Robuck
Mike Robuck
7/22/2016 1:43:43 PM
User Rank
Author
Re: Carrier Grade Requirements
Good questions! I'm going to have a follow up story next week and I'll make sure to ask about these. Thanks

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ScottK
ScottK
7/21/2016 5:45:16 PM
User Rank
Steel
Carrier Grade Requirements
Excellent achievement! Can you comment on the Carrier Grade Requirements for Reliability, Scalabiity, and Maintainability that this project set as goals? Were they achieved? Have they published their architecture and results? What do you see as the next steps needed for this to be adopted by Carriers? Thanks!

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