A cache coherent data processing system includes at least non-overlapping first, second, and third coherency domains. A master in the first coherency domain of the cache coherent data processing system selects a scope of an initial broadcast of an interconnect operation from among a set of scopes including (1) a remote scope including both the first coherency domain and the second coherency domain, but excluding the third coherency domain that is a peer of the first coherency domain, and (2) a local scope including only the first coherency domain. The master then performs an initial broadcast of the interconnect operation within the cache coherent data processing system utilizing the selected scope, where performing the initial broadcast includes the master initiating broadcast of the interconnect operation within the first coherency domain.