aws elbv2 set-subnets
Enables the Availability Zones for the specified public subnets for the specified Application Load Balancer, Network Load Balancer or Gateway Load Balancer. AWS CLI reference
4 options Its page in the AWS CLI reference
Options
--enable-prefix-for-ipv6-source-nat[Network Load Balancers with UDP listeners] Indicates whether to use an IPv6 prefix from each subnet for source NAT.--ip-address-typeThe IP address type.--load-balancer-arnThe Amazon Resource Name (ARN) of the load balancer.--subnet-mappings, --subnetsThe IDs of the public subnets.