Posted on November 9, 2017 11:32 am
 |  Asked by Naleendra Weerapitiya
 |  229 views
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Hi,

Am working on an RFP and it has a reference to there being necessary flowlet switching between Leaf and Spine. I believe that Arista uses round robin between leaf and spine.

How do we counter this point ? What are the relative advantages and disadvantages of each ? Am sure that Arista doesn’t include flowlet switching due to valid reasons ( I read that even Juniper uses this on certain models ).

 

Regards,

Naleendra

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Posted by Alexis Dacquay
Answered on August 14, 2020 9:56 pm

Hi,
Arista supports very extensive load-balancing settings that make it very efficient.
There are also several platforms that support Dynamic load-balancing (DLB), or VoQ and cell-based internal architecture.

Practically, it performs great and "flowlet" or "mice-vs-elephant" flows are sometimes a non-issue compared with other network principles that just blow the problem away: denser, faster, cheaper, sooner. That cannot be achieved by carefully designed ASIC that might indeed support flowlet, but the hardware manufacturers of these silicon are preferring rawer killer features (denser, faster, cheaper, sooner) over optimisations like flowlet.

In a summary: great idea. I like it. But practically it's a non-issue, the problem is resolved another way.

Note: there are some very valid use cases for this, I am generalising.

Regards,

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