DCX director wants to make a ISL link to existing SAN

Dear All,

I would like to do SAN migration from existing switch to DCX.
Can I do following actions to fulfill the requirement?

1. Change different doman_id and set PID=1 on DCX
2. ISL link to existing fabric (2 Switches, one is DS-16B3 and other DS-220B)

The problem is firmware version of DS-16B3 too old to connect DCX.
But firmware version of DS-220B can.

Can I make a ISL link from DCX to DS-220B without any risk for existing production environment?

Thank you for any suggestion.

Best Regards,
Dennis Dai