use the console to add multiple backend servers to Alibaba Server Load Balancer (SLB),
the SLB sends traffic to the primary ENI of the next-hop backend
servers. Because the primary ENI is the management interface, traffic
must go to the Untrust interface (a secondary ENI) for inspection.
ensure that internet traffic goes to dataplane interfaces rather
than the management interface, use the Alibaba CLI to attach the
VM-Series firewall untrust ENIs to your SLB instance.