This read-create object sets the maximum number of {source,group} pairs the DC-PIM TIB Manager may store as non-interface-specific (S,G) state, with zero meaning unlimited. An admin uses this to bound per-source multicast state on the router, which is typically larger than pure (*,G) state when many sources exist per group. For example, an admin running SSM with many independent video sources per channel would size this limit based on expected source count.