Creating a Cache Subnet Group
A cache subnet group is a collection of subnets that you may want to designate for your cache clusters in an Amazon VPC. When launching a cache cluster in an Amazon VPC, you need to select a cache subnet group. Then ElastiCache uses that cache subnet group to assign IP addresses within that subnet to each cache node in the cluster.
For guidance on how to create a subnet group using the ElastiCache Management Console, the AWS CLI, or the ElastiCache API, go to Creating a Subnet Group.
After you create a cache subnet group, you can launch a cache cluster to run in your Amazon VPC. Continue to the next topic Creating a Cache Cluster in an Amazon VPC.