A packet switch is described. In one embodiment, the packet switch comprises a plurality of ingress ports for receiving packets at the packet switch and for appending a tag to each packet that designates one of the plurality of ingress ports that received the packet; a plurality of egress ports for removing the tag from the packets and transmitting the packets from the packet switch; and switch fabric for switching the packets from one of the plurality of ingress ports to one of the plurality of egress ports.