Keep maintenance associated with an Infoblox IB-4000-MOD-DFWFY module for a 1-year term. IB-MAIN-4000-MOD-DFWFYE-I21 is an ISP L3+ maintenance service code tied to that named supported product. It is a service entitlement, not a hardware module, and it should be selected when the installed or planned platform module matches the supported-product designation exactly. The service term is expressed as one year and the maintenance characteristic is ISP L3+. These two identifiers matter when matching an existing service level and renewal period: the term establishes the coverage interval, while ISP L3+ identifies the maintenance tier carried by this SKU. The code is specific to IB-4000-MOD-DFWFY rather than a general-purpose Infoblox maintenance entitlement. Use this service where continued maintenance for the named module is required without changing the underlying hardware configuration. Review the supported-product designation against the module already in service before ordering, particularly where similar platform modules are present. The SKU represents maintenance coverage only; it does not indicate a new appliance, a new module, a software license, or a platform expansion. Its value is in maintaining the stated ISP L3+ service level for the defined one-year period.