NETGEAR ProSafe GS108

GS108T Smart Switch Software Administration Manual
Virtual Local Area Networks (VLANs) B-3
v1.0, May 2007
4. The following situations produce results as described:
• If an untagged packet enters Port 1, the switch tags it with a VLAN tag value 10. The
packet has access to Port 2 and Port 3. The outgoing packet is stripped of its tag to leaves
Port 2 as an untagged packet. For Port 3, the outgoing packet leaves as a tagged packet
with a VLAN tag value of 10.
• If a tagged packet with a VLAN tag value 10 enters Port 3, the packet has access to Port 1
and Port 2. If the packet leaves Port 1 and/or Port 2, it is stripped of its tag to leave the
switch as an untagged packet.
• If an untagged packet enters Port 4, the switch tags it with a VLAN tag value 20. The
packet will have access to Port 5 and Port 6. The outgoing packet is stripped of its tag to
become an untagged packet as it leaves Port 6. For Port 5, the outgoing packet leaves as a
tagged packet with a VLAN tag value of 20.
Port-based VLANs
Port-based VLANs help to confine broadcast traffic to the switch ports. This switch allows up to 8
port-based VLAN group, Any one port can belong to different VLAN groups. The default VLAN
group is a port-based VLAN that has all ports belonging to VLAN 1.
Packets received by the switch are treated in the following way:
• When a packet enters a port, it can only proceed to ports with the same VLAN membership as
that ingress port.
• If a port on the switch does not have a common VLAN membership with the source port, the
packet is dropped.
Port-based VLAN Example Configuration
This example basically demonstrates how the port-based VLANs work to meet your needs.
Setup the following VLANs, each with defined descriptions:
• VLAN 1 (IT department)
• VLAN 2 (Sales department)
• VLAN 3 (Marketing department)
• VLAN 4 (Accounting department).
• Configure the VLAN membership. Be sure to set all of them as follows.
• Setting up second VLAN group (Sales), VLAN ID = 02, with membership of ports 1~3 and 8.