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I think you have to have the profiler product. I don't think Brocade will give that data up over SNMP, it needs to communicate it via CLI. In other words, you cannot do this with 10.1 out of the box.
The other answer is correct. VSAN is specific to Cisco MDS. Brocade and McData call them Zones. Unfortunantly, Brocade does not expose the Zone data via SNMP. I spoke with their product team and from my understanding they don't have any plans to in the near future. I would recommend putting this request into you Brocade rep.
Profiler does gather zones, as it telnet/ssh into them and pulls it from there. See here under the SAN Groups for Brocade