Port-Based VLANs

In a port-based VLAN, a VLAN name is given to a group of one or more ports on the switch.

At boot-up, all ports are members of the port-based VLAN default. Before you can add any port to another port-based VLAN, you must remove it from the default VLAN, unless the new VLAN uses a protocol other than the default protocol any. An untagged port can be a member of only one port-based VLAN.

On the Extreme Networks switch in the following figure, ports 9 through 14 are part of VLAN Marketing; ports 25 through 29 are part of VLAN Sales; and ports 21 through 24 and 30 through 32 are in VLAN Finance.
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Example of a Port-Based VLAN on an Extreme Networks Switch
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For the members of different IP VLANs to communicate, the traffic must be routed by the switch, even if the VLANs are physically part of the same I/O module. This means that each VLAN must be configured as a router interface with a unique IP address.