According to an example, a multi-mode agent may include a processor interconnect (PI) interface to receive data from a processor and to selectively route the data to a node controller logic block, a central switch, or an optical interface based on one of a plurality of modes of operation of the multi-mode agent. The modes of operation may include a glueless mode where the PI interface is to route the data directly to the optical interface and bypass the node controller logic block and the central switch, a switched glueless mode where the PI interface is to route the data directly to the central switch for routing to the optical interface, and bypass the node controller logic block, and a glued mode where the PI interface is to route the data directly to the node controller logic block for routing to the central switch and further to the optical interface.