A network switch comprises a plurality of ports that exchange frames of
data with one or more network devices. A transfer circuit transfers the
frames of the data between the ports. At least one of the ports includes
a loopback circuit that sends to the transfer circuit each frame of the
data received by the at least one of the ports from the transfer circuit
when the one of the ports is not operational. A redirect circuit causes
the transfer circuit to transfer each frame of the data received by the
transfer circuit from the one of the ports to one or more predetermined
others of the ports when the one of the ports is not operational.