A switch device can be configured to operate in a manner that was not originally intended. For example, a switch device can be a Broadcom XGS type of device that is configured with a packet-processing unit to perform line speed lookups in accordance with a default configuration. The default configuration can include classifying and forwarding received packets to an upstream interface based on VLAN information. The default configuration can be overwritten such that the switch device operates in a different manner than originally intended. For example, the switch device can be reconfigured to include mapping rules that specify different QoS data to be assigned to different type of received packets. Subsequent to utilizing the maps to identify QoS information for received packets, the reconfigured switch device uses the QoS information to forward the packets to queues in an upstream interface.