1. A computer-implemented method for tag networking, the method comprising: receiving an inquiry as to whether one or more network devices in a computer network are configured to handle a tag; determining, based on the tag, that the one or more network devices in the computer network are configured to handle the tag; transmitting a response to the inquiry indicating that the one or more network devices in the computer network are configured to handle the tag; receiving a packet of a traffic flow, wherein the packet includes the tag located among data of the packet, and wherein the tag was added to the packet in response to receiving the response to the inquiry; reading the packet to identify the tag that is located among the data of the packet; performing a tag lookup to find logic that is associated with the tag; and applying the logic to the packet in response to performing the tag lookup, wherein the logic includes instructions for carrying out a service of the network.