After set node description with UFM,MQM9790 move to another opensm subnet(no UFM),ibswitches show the node description,which means that value stored in switch.
Switch : 0xfc6a1c0300a44840 ports 65 “IB-LEAF-1” base port 0 lid 2 lmc 0
Then how to change it?Use mlxconfig or other commands?