Extend maintenance coverage for an NT-MRI-1K-100R platform with a 1-year Infoblox ISP L3+ service term. This service product applies to the named supported platform rather than supplying an appliance, expansion module, or software package. It gives administrators a defined annual maintenance entitlement associated with the ISP L3+ level. NT-MAIN-MRI-1K-100R-S21 is intended for environments that already operate the compatible NT-MRI-1K-100R platform and need the corresponding maintenance term. The service duration is one year. Match the covered platform designation carefully: this entitlement is specifically associated with NT-MRI-1K-100R, not a general-purpose service term for unrelated Infoblox systems. The distinguishing details are the ISP L3+ maintenance designation, the 1-year coverage period, and the explicitly named supported platform. These details matter when maintaining an installed Infoblox deployment because service level and platform association determine whether the entitlement matches the equipment or system already in operation. Select this service where the required maintenance level is ISP L3+ and the supported product reference is NT-MRI-1K-100R.