switchport backup interface for ICX 6450

Hello,in cisco with following commands we can set a switchport back for a port but i do not find anything like them for ICX 6450 , can anyone help us ? switchport backup interface Gi1/0/46 switchport backup interface Gi1/0/46 preemption mode forced switchport backup interface Gi1/0/46 preemption delay 5Thank you.