Subnet manager between different switch brand

Hello, into my infiniband cluster infrastructure i have a Intel IB switch (Intel True Scale Edge Switch 12300), i bough a new switch Mellanox voltaire 4036 and connected to the intel switch,

actually the intel switch is set as master with priority 0 but if i enable the 4036 switch subnet manager it do not became slave but master....

Is it normal or simply is not possible to activate the subnet manager in 2 different switch brands ?

Thanks