# Multi-cluster prerequisites for AWS CloudHSM
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Before configuring your cluster in AWS CloudHSM to connect to multiple clusters, you must meet the following prerequisites: 
+ Two or more AWS CloudHSM clusters to which you’d like to connect to, along with their cluster certificates.
+ An EC2 instance with Security Groups correctly configured to connect to all of the clusters above. For more information about how to set up a cluster and the client instance, refer to [Getting started with AWS CloudHSM](getting-started.md).
+ To set up multi-cluster functionality, you must have already downloaded and installed the CloudHSM CLI. If you have not already done this, refer to the instructions in [Getting started with AWS CloudHSM Command Line Interface (CLI)](cloudhsm_cli-getting-started.md).
+  You will not be able to access a cluster configured with `./configure-cli[.exe] -a` since it will not be associated with a `cluster-id`. You can reconfigure it by following `config-cli add-cluster` as described in this guide.