D-Link DWS-3227P - xStack Switch - Stackable Manual do Utilizador descarregar pdf (Página 12)

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Port-based VLANs

With port-based VLAN membership, the port is assigned to a specific VLAN

independent of the user or system attached to the port. This means all users

attached to the port should be members in the same VLAN. The network

administrator typically performs the VLAN assignment. The port configuration is

static and cannot be automatically changed to another VLAN without manual

reconfiguration.

As with other VLAN approaches, the packets forwarded using this method do not leak

into other VLAN domains on the network. After a port has been assigned to a VLAN,

the port cannot send to or receive from devices in another VLAN without the

intervention of a Layer 3 device.

The device that is attached to the port likely has no understanding that a VLAN

exists. The device simply knows that it is a member of a subnet and that the device

should be able to talk to all other members of the subnet by simply sending

information to the cable segment. The switch is responsible for identifying that the

information came from a specific VLAN and for ensuring that the information gets to

all other members of the VLAN. The switch is further responsible for ensuring that

ports in a different VLAN do not receive the information.

This approach is quite simple, fast, and easy to manage in that there are no complex

lookup tables required for VLAN segmentation. If port-to-VLAN association is done

with an application-specific integrated circuit (ASIC), the performance is very good.

An ASIC allows the port-to-VLAN mapping to be done at the hardware level.

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D-Link DWS-3227P - xStack Switch - Stackable Manual do Utilizador Página 12