  We consider a hybrid wireless local area network composed of both WiFi and
LiFi Access Points (AP) and wireless devices. Each device is identified in the
network by a unique IP address, using a virtual network interface obtained by
bonding the WiFi and LiFi physical interfaces, implemented through commercially
available products. We measure the time it takes to switch between the two
physical interfaces and its impact on the traffic flow, under different
settings of the mechanisms used by the interface bonding driver. Different
specific triggering events are considered for the switch, namely: an
(simulated) interface malfunctioning or unintended shutdown, a signal loss, and
a manual (intended) switch. Our experimental results show that the different
types of triggering events have an impact on the time it takes to reconfigure
the currently active physical interface (which is used by the virtual interface
to send/receive data), with connection recovery times ranging from few tens
milliseconds to few seconds. This entails a packet loss on active flows which,
in the worst case, we quantify in a maximum loss of up to 1% of the traffic
flowing during 1 second.
