We have developed a guide for customers on vSCG 2.5.0.1 or v3.0 to migrate gracefully to new v3.0.3 release.
There is no migration path from vSCG 2.5.
This process will help REPLACE the existing vSCG with v3.0.3, using the same IP and MAC address, making
it simple for AP discovery by present and new access points.
https://support.ruckuswireless.com/answers/000004154
