Maintain service coverage for the Infoblox ND-1400-SW-NIGRID product with a one-year ISP L3+ maintenance entitlement. ND-MAIN-1400-SW-NIGRID-I21 identifies the annual maintenance orderable tied to that supported product designation. The covered period is one year, making this service appropriate where an existing deployment requires continued maintenance coverage for the named Infoblox platform. ISP L3+ is the service characteristic attached to this entitlement. It distinguishes the offering as a maintenance service for ND-1400-SW-NIGRID rather than a physical appliance, capacity expansion, or separately described software function. Match the supported-product designation to the system requiring coverage; ND-1400-SW-NIGRID is the product reference associated with this service term. The full ordering code and the supported-product designation serve different purposes. ND-MAIN-1400-SW-NIGRID-I21 identifies the one-year maintenance entitlement, while ND-1400-SW-NIGRID identifies the covered product designation. This distinction matters when maintaining an established Infoblox environment because the service association is expressed against the supported product name. The item provides a defined one-year ISP L3+ maintenance term and should be selected where that exact service characteristic and product association are required.