SDWAN has gained lots of attention during last 3 years with new terms, hypes, marketing buzz and finally some Intelligence to legacy WAN.

What is SDWAN ? Keep all marketing stuff and hype away, in simple terms SDWAN is a solution to allow enterprises and their branch locations to use multiple WAN or Internet links (combination of high quality and cheap commodity) to build their virtual private network, via an Over The Top (OTT) approach...

Reza Toghraee
Technical Manager (CCIE, Cloud, SDN, Netwrok, Security Expert)

at ArpaWare

The CPE devices simply run DHCP client to retrieve IP address. The aggregation switch acts as a DHCP relay and forwards the DHCP request to the FreeRadius-DHCP. 

FreeRadius-DHCP authenticates the user based on MAC address of the CPE router, and returns back the subscriber properties such as IP address, bandwidth, quota , lease expiration, etc.  A DHCP response will be sent to the subscriber's CPE , also FreeRadius triggers the Puppet to publish the user's restrictions on aggregation switches. 

Reza Toghraee
Technical Manager (CCIE, Cloud, SDN, Netwrok, Security Expert)

at ArpaWare

You can buy a baremetal switch from a re-seller or an online shop. buying bare metal is much simpler than buying stuff from big vendors where they question you 1000 things to find-out where they can upsell. Normally resellers also provide you with NOS (Network Operating System) from different vendors such as Cumulus, IPinFusion, Pica8 or BigSwitch.

Reza Toghraee
Technical Manager (CCIE, Cloud, SDN, Netwrok, Security Expert)

at ArpaWare