This reports the hardware or software ceiling on how many entries this legacy IP ACL table can hold in total, the fixed capacity limit against which cienaCesAclInUseEntries is measured. An admin uses this specifically when planning a large batch addition of new authorized source entries, checking it against current usage to confirm there's enough remaining room before starting, rather than discovering a capacity wall mid-rollout. For example, a network team planning to add authorization entries for 50 new partner subnets would check this maximum against the current in-use count first, and if only 30 slots remain, would need to plan consolidation or exclude lower-priority partners from the initial rollout.