VLAN Management
Defining VLAN Membership
Cisco 500 Series Stackable Managed Switch Administration Guide Release 1.3 220
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Untagged port membership between two VLAN-aware devices with no 
intervening VLAN-aware devices, must be to the same VLAN. In other words, the 
PVID on the ports between the two devices must be the same if the ports are to 
send and receive untagged packets to and from the VLAN. Otherwise, traffic might 
leak from one VLAN to another. 
Frames that are VLAN-tagged can pass through other network devices that are 
VLAN-aware or VLAN-unaware. If a destination end node is VLAN-unaware, but is 
to receive traffic from a VLAN, then the last VLAN-aware device (if there is one), 
must send frames of the destination VLAN to the end node untagged. 
Configuring Port to VLAN
Use the Port to VLAN page to display and configure the ports within a specific 
VLAN.
To map ports or LAGs to a VLAN:
STEP 1 Click VLAN Management > Port to VLAN.
STEP  2 Select a VLAN and the interface type (Port or LAG), and click Go to display or to 
change the port characteristic with respect to the VLAN. 
The port mode for each port or LAG appears with its current port mode (Access, 
Trunk or General) configured from the Interface Settings page. 
Each port or LAG appears with its current registration to the VLAN. 
STEP  3 Change the registration of an interface to the VLAN by selecting the desired 
option from the following list:
• Forbidden—The interface is not allowed to join the VLAN even from GVRP 
registration. When a port is not a member of any other VLAN, enabling this 
option on the port makes the port part of internal VLAN 4095 (a reserved 
VID). 
• Excluded—The interface is currently not a member of the VLAN. This is the 
default for all the ports and LAGs. The port can join the VLAN through GVRP 
registration.
• Tagged—The interface is a tagged member of the VLAN. 
• Untagged—The interface is an untagged member of the VLAN. Frames of 
the VLAN are sent untagged to the interface VLAN.
• Multicast TV VLAN—The interface used for Digital TV using Multicast IP.