Keep the supported Infoblox NT-MRI-500-100R platform associated with a one-year ISP L3+ maintenance term. NT-MAIN-MRI-500-100R-S21 is a service entitlement rather than a physical appliance, identifying the maintenance coverage period and the ISP L3+ maintenance tier for the named supported product. The service designation matters when matching coverage to an installed NetMRI platform. The supported-product reference is NT-MRI-500-100R, while the maintenance ordering code identifies the associated one-year term. This relationship helps distinguish platform hardware from the service entitlement attached to it and keeps the maintenance selection aligned to the exact supported designation. Within the applicable maintenance range, this service is differentiated by three explicit attributes: it covers the NT-MRI-500-100R designation, carries an ISP L3+ maintenance classification, and provides a one-year coverage period. It does not represent a replacement NetMRI appliance or an additional hardware component. Use the precise supported-product designation when reviewing existing service coverage so that the maintenance tier and term correspond to the installed Infoblox platform.