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When setting up Stackexchange.Redis in a .NET Core environment with high availability mode, you should follow these steps:

1. Install the Stackexchange.Redis NuGet package in your .NET Core application.

2. Configure the Redis cache client in the ConfigureServices method of the Startup class. Set the following attributes on the client to enable high availability mode:

   // Configure the Redis client
   services.AddStackExchangeRedisCache(options =>
   {
      options.Configuration = "localhost:6379,localhost:6380,abortConnect=false";
      options.InstanceName = "myapp";
   });
   

   The Configuration attribute specifies the Redis servers to connect to. You can specify multiple servers separated by a comma. The abortConnect option determines whether the client should abort if it can't connect to any server in the list.

   The InstanceName attribute sets a unique identifier for your Redis instance. This is useful if you're running multiple instances of Redis on the same server.

3. When accessing the Redis cache in your application, you can use the IDistributedCache interface. When you call the Set or Get methods on this interface, Stackexchange.Redis automatically handles failover to secondary servers in case of a primary server failure.

By following these steps, you can configure Stackexchange.Redis to work in high availability mode in your .NET Core application.