Allied Telesis AT-S39 - Manual (Page 96)

Section II: Local and Telnet Management
96
Drawbacks to
Port-based
VLANs
There are several drawbacks to port-based VLANs:
❑ It is not easy to share network resources, such as servers and
printers, across multiple VLANs. A router or Layer 3 switch must be
added to the network to provide a means for interconnecting the
port-based VLANs.
❑ The introduction of a router into your network could create
security issues from unauthorized access to your network.
❑ A VLAN that spans several switches will require a port on each
switch for the interconnection of the various parts of the VLAN.
For example, a VLAN that spans three switches would require one
port on each switch to interconnect the various sections of the
VLAN. In network configurations where there are many individual
VLANs that span switches, many ports can end up being used
ineffectively just to interconnect the various VLANs.