Allied-telesis AT-S25 Manual do Utilizador descarregar pdf (Página 146)

Introduction to Virtual LANs

146

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 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 just 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.

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Allied-telesis AT-S25 Manual do Utilizador Página 146