Netgear GSM4328PB Software Administration Manual Software Version 12.x - Page 25
VLAN Concepts
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M4300 Series and M4300-96X Fully Managed Switches VLAN Concepts Adding virtual LAN (VLAN) support to a Layer 2 switch offers some of the benefits of both bridging and routing. Like a bridge, a VLAN switch forwards traffic based on the Layer 2 header, which is fast. Like a router, it partitions the network into logical segments, which provides better administration, security, and management of multicast traffic. A VLAN is a set of end stations and the switch ports that connect them. You can have different reasons for the logical division, such as department or project membership. The only physical requirement is that the end station and the port to which it is connected both belong to the same VLAN. Each VLAN in a network has an associated VLAN ID, which appears in the IEEE 802.1Q tag in the Layer 2 header of packets transmitted on a VLAN. An end station might omit the tag, or the VLAN portion of the tag, in which case the first switch port to receive the packet can either reject it or insert a tag using its default VLAN ID. A given port can handle traffic for more than one VLAN, but it can support only one default VLAN ID. The Private Edge VLAN feature lets you set protection between ports located on the switch. This means that a protected port cannot forward traffic to another protected port on the same switch. The feature does not provide protection between ports located on different switches. The diagram in this section shows a switch with four ports configured to handle the traffic for two VLANs. Port 1/0/2 handles traffic for both VLANs, while port 1/0/1 is a member of VLAN 2 only, and ports 1/0/3 and 1/0/4 are members of VLAN 3 only. The script following the diagram shows the commands you would use to configure the switch as shown in the diagram. Layer 3 switch Port 1/0/2 VLAN Router Port 1/3/1 192.150.3.1 Port 1/0/3 VLAN Router Port 1/3/2 192.150.4.1 Port 1/0/1 Layer 2 Switch Layer 2 Switch VLAN 10 VLAN 20 Figure 2. Switch with 4 ports configured for traffic from 2 VLANs VLANs 25 Software Administration Manual
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