on the tr3548 about metrocluster configuration it's say that you can not use trunking protocol between brocade switch who are in the backend of your metrocluster (those who are dedicated between controler and drive). Do you know if this information is steal useable or it have been update and you can use it to have more speed and high availability.
This is still the same. Trunking is not supported for backend switches. You can have multiple ISLs in which case you need to configure traffic isolation zones to segregate interconnect from disk traffic.