Netgear CSM4532 Software Administration Manual - Page 45
VLAN Tagging
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ID. In a tagged frame, the VLAN is identified by the VLAN ID in the tag. In an untagged frame, the VLAN identifier is the Port VLAN ID (PVID) specified for the port that received the frame. For information about tagged and untagged frames, see "VLAN Tagging". You can add individual ports and Port-channels as VLAN members. The following figure shows an example of a network with three VLANs that are department-based. The file server and end stations for the department are all members of the same VLAN. Figure 3-1: Simple VLAN Topology In this example, each port is manually configured so that the end station attached to the port is a member of the VLAN configured for the port. The VLAN membership for this network is port-based or static. 3.2.1. VLAN Tagging The switch supports IEEE 802.1Q tagging. Ethernet frames on a tagged VLAN have a 4-byte VLAN tag in the header. VLAN tagging is required when a VLAN spans multiple switches, which is why trunk ports transmit and receive only tagged frames. Tagging may be required when a single port supports multiple devices that are members of different VLANs. For example, a single port might be connected to an IP phone, a PC, and a printer (the PC and printer are connected via ports on the IP phone). IP phones are typically configured to use a tagged VLAN for voice traffic, while the PC and printers typically use the untagged VLAN. When a port is added to a VLAN as an untagged member, untagged packets entering the switch are tagged with the PVID (also called the native VLAN) of the port. If the port is added to a VLAN as an untagged member, the port does not add a tag to a packet in that VLAN when it exits the port. Configuring the PVID for an interface is useful when untagged and tagged packets will be sent and received on that port and a device connected to the interface does not support VLAN tagging. NETGEAR M4500 Series Switches Software Administration Manual 45