Multicast - ASM and SSM on same network
When you enable SSM, you enable it for a particular range. That range by default is 126.96.36.199/8. Alternatively, you can specify the range you want to use SSM using an ACL.
In either case, if a host tries to join any group within the specified SSM range without specifying a source, that join request will be dropped. However, if a host attempts to join any group that is not within the specified SSM range without specifying a source, that join message will be accepted and will behave like a normal any source multicast.