Using HP-UX VLANs (September 2004)

What are HP-UX VLANs?
Chapter 1 15
VLANs isolate broadcast and multicast traffic by determining which
destinations should receive that traffic, thereby making better use of
switch and end-station resources. With VLANs, broadcasts and
multicasts go only to the intended nodes in the virtual LAN.
VLANs create broadcast domains using switches instead of routers.
While VLANs in some environments may reduce the number of routers
needed (and their latency), you still need a router if you want the VLANs
to communicate with each other.