Chapter 2: Bridging Configuration Guide

MAC address based

Protocol based

Subnet based

Multicast based

Policy based

Detailed information about these types of VLANs is beyond the scope of this manual. Each type of VLAN is briefly explained in the following subsections.

Port-based VLANs

Ports of L2 devices (switches, bridges) are assigned to VLANs. Any traffic received by a port is classified as belonging to the VLAN to which the port belongs. For example, if ports 1, 2, and 3 belong to the VLAN named “Marketing”, then a broadcast frame received by port 1 is transmitted on ports 2 and 3. It is not transmitted on any other port.

MAC-address-based VLANs

In this type of VLAN, each switch (or a central VLAN information server) keeps track of all MAC addresses in a network and maps them to VLANs based on information configured by the network administrator. When a frame is received at a port, its destination MAC address is looked up in the VLAN database, which returns the VLAN to which this frame belongs.

This type of VLAN is powerful in the sense that network devices such as printers and workstations can be moved anywhere in the network without the need for network reconfiguration. However, the administration is intensive because all MAC addresses on the network need to be known and configured.

Protocol-based VLANs

Protocol-based VLANs divide the physical network into logical VLANs based on protocol. When a frame is received at a port, its VLAN is determined by the protocol of the packet. For example, there could be separate VLANs for IP, IPX and Appletalk. An IP broadcast frame will only be sent to all ports in the IP VLAN.

Subnet-based VLANs

Subnet-based VLANs are a subset of protocol based VLANs and determine the VLAN of a frame based on the subnet to which the frame belongs. To do this, the switch must look into the network layer header of the incoming frame. This type of VLAN behaves similar to a router by segregating different subnets into different broadcast domains.

SmartSwitch Router User Reference Manual

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Cabletron Systems 9032578-02 manual Port-based VLANs, MAC-address-based VLANs, Protocol-based VLANs, Subnet-based VLANs

9032578-02 specifications

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