Systems and methods are described for providing network route redundancy
through Layer 2 devices, such as a loop free Layer 2 network having a
plurality of switching devices. A virtual switch is coupled to the loop
free Layer 2 network, the virtual switch having two or more switches
configured to transition between master and backup modes to provide
redundant support for the loop free Layer 2 network, the switches
communicating their status through use of a plurality of redundancy
control packets. The system also includes means for allowing the
redundancy control packets to be flooded through the Layer 2 network. The
means may include time-to-live data attached to the redundancy control
packet which is decremented only when the packets are transferred through
devices which are configured to recognize the protocol used in redundancy
control packets.