Snoops for access to inner/outer shareable domain

Let's assume a cluster w/ 4 cores and one DSU. The core have L1/L2 private data cache. There is a L3 cache in DSU, shared by cores in the cluster. Here are the questions:

#1. For a read access marked as inner shareable, if the inner snoops inside DSU missed, will DSU issue snoops to the external fabric (say CMN) or just ReadNoSnoop to external memory directly?

#2. For a read access marked as outer shareable, will DSU snoop inside the inner domain firstly then go to outer domain by snooping fabric if no luck in inner snooping? 

Many thanks.

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