Vehicular Delay-Tolerant Networks (VDTNs) use vehicles to transfer data between nodes, enabling network connectivity in sparse or partitioned opportunistic networks, where the low node density contributes to an absence of end-to-end links. By implementing a DTNs store-carry-and-forward paradigm, VDTNs allow delay-tolerant data traffic from a variety of vehicular applications to be routed over time, such as, but not limited to, information queries and context-specific broadcasts. Network Management adopts a key function in the well being of any communication network. This work proposes an application-layer approach, where a dedicated server is deployed to collect load-related information from VDTN nodes using SNMP (Simple Network Management Protocol). In this paper will be presented the design of this network management system and its demonstration and validation in a laboratory-based testbed, called VDTN@Lab.