Advantages Of Software Defined Networks?

Besides UNIFI, Meraki, Peplink and Datto what other SDN options are there? I see many advantages using SDN networks for IP security networks but what are the disadvantages when using them over standard CLI/web GUI managed switches.

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* *** **** ********** ***** *** ******** *** ** ******** networks...

***** *** ***** ***** **** ******* **** ** *** ******* advantages, ******* * ***'* ***** **** *** *******, ******** ** are ******* ***** ********* (***-*********) ******** ********.

**** *** ******* *** is ******* **********. ****** how *** **** ******** are *********, ***** ***** are ** *****/********* *** where **** ******/****** ******** to *** ******* ** real **** ** * huge **** ***** **** it ***** ** ******* and ******* *************. *** have *** ********* ** monitor *** ******* *** of **** ******* ******** and *******.

**** ** ** ******* of * ****** ** are ******* ** ***** now. **** ******* ** automatically ******* ** **** time ** ** ******* devices ** *** *******.

**** *** ******* *** is ******* **********.

** ** *** ** switches *** ***** **, hasn't **** **** ****** by **** *** ******* vendors *********?

**** *** *** **** of **** *** **** but *** ** ***** time *** *** **** understand **** *** *** to ********* **********. **** management ******** *** **** costs ***** *** **** to ***** ***** **** is *** ***** **** SDN ********. **** **** I **** **** **** SDN *** *** ***** your **** ***** **** how ** *** **** up. *** ** ******* setting ** ***** ****** many ******** ** **** simple *** ***** ******* to **** ***.

**** ***** ** **** ******* ****? * ** **********.

**** ** ************** **** ** ********, routers, *** ***

*** *** ************* *** **** ** it ***** **** **** have ******** ***.

** *** ******** ***.

*** ******* ************ **** I ** ***** ** is ****** ****-**. **** has **** ************* ********* on *** ****** - licensing, ******* ***** (******** assurance/maintenance **********), ***** *********, drops ** ************* ******* over ****, ***.

*'** **** **** *** Meraki ***** *** ********. Its * ********* *******, makes ******* * *********** IT ********* * **** and *** ******* *** & ***** **** *** bees ***** *** **** a ****** *******. ****, as **** **** **, costs **********, ******* ******* came *** ***** *** because ** *** *** core ** ***** ******** / ******** **** ******'* step ****.

****** *** **** **** in *** ****** *** all ****...

**** ***** ******* ******** + **** *** *** work **** *** *** like **** *** ****, except **** ******* **** at **'* *** ***** - *************, **********...

**** **** ******.

****, ***** *** ***.*************.*** ** **** **** ** ** * candidate ** **** *** * ****** *** ********. * *** could *** *** ***** ** *** ********* *** ****** ***** deployments.