Allied-telesis AT-S25 Manual de usuario descargar pdf (Pagina 122)

Section II: Local and Telnet Mangement

122

❑ A port can be an untagged member of only one port-based VLAN

at a time.

❑ Each port must be assigned a PVID. This value must be the same

for all ports in a port-based VLAN and it must match the VLAN’s

VID. This value is assigned automatically by the AT-S25

management software.

❑ If there are end nodes in different VLANs that need to

communicate with each other, a router or Layer 3 switch is

required to interconnect the VLANs.

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 stacks of 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.

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Allied-telesis AT-S25 Manual de usuario Pagina 122