Hello,  With the SCv3020, and 2 FC switches you would not ISL trunk them, you would want 2 separate fabrics to accommodate 2 separate Fault Domains. You would use an ISL if you needed to connect another switch for additional ports, I'm not familiar with Cisco Stackwise so I cannot address that.
Hi, HW INFO: -2x R640 with 2x HBA -2x Brocade 300 -SCv3020 -SCv300 Cabling [IMAGE]   ? 1. Do I need to connect cable between Brocade 300 to enable ISL Trunk2. What are benefit if I enable ISL Trunk between them3. In what situation I need to enable ISL Trunk4. Is ISL Trunk same meaning as StackWIse cable in Cisco.So instead of config each switch separately. I can connect to either switch but can config other switch too5. If I enable ISL Trunk. Do I need to change my existing WWN zoning thanks
Brocade 300 ISL Trunk