不直接使用 aws 的 rds 服务的话，是否也可以部署 RAC 呢？
https://aws.amazon.com/articles/7455908317389540#Step_4_Setting_up_shared_storage
看这个链接，我看到这句：
On EC2, the network does not natively support multicast IP. However, RAC needs to broadcast packets over multicast during cluster configuration and reconfiguration events.
这里的多播和广播是指？ vpc 不能办到吗
https://aws.amazon.com/articles/7455908317389540#Step_4_Setting_up_shared_storage
看这个链接，我看到这句：
On EC2, the network does not natively support multicast IP. However, RAC needs to broadcast packets over multicast during cluster configuration and reconfiguration events.
这里的多播和广播是指？ vpc 不能办到吗
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