Sun Microsystems GigaSwift Ethernet Adapter User Manual
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Chapter 5
Configuring VLANs
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The physical LAN network consists of a switch, two servers, and five clients. The
LAN is logically organized into three different VLANs, each representing a different
IP subnet.
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VLAN 1 is an IP subnet consisting of the Main Server, Client 3, and Client 5. This
represents an engineering group.
■
VLAN 2 includes the Main Server, Clients 1 and 2 by means of a shared media
segment, and Client 5. This is a software development group.
■
VLAN 3 includes the Main Server, the Accounting Server and Client 4. This is an
accounting group.
The Main Server is a high-use server that needs to be accessed from all VLANs and
IP subnets. The server has a Sun GigaSwift Ethernet adapter installed. All three IP
subnets are accessed by means of the single physical adapter interface. The server is
attached to one of the SunSwitch’s Gigabit Ethernet ports, which is configured for
VLANs 1, 2, and 3. Both the adapter and the connected SunSwitch™ port have
tagging turned on. Because of the tagging VLAN capabilities of both devices, the
sever is able to communicate on all three IP subnets in this network, but continues to
maintain broadcast separation between all of them.
The Accounting Server is available to VLAN 3 only. It is isolated from all traffic on
VLANs 1 and 2. The switch port connected to the server has tagging turned off.
Clients 1 and 2 are attached to a shared media hub that is then connected to the
switch. They belong to VLAN 2 only, and are logically in the same IP subnet as the
Main Server and Client 5. The switch port connected to this segment has tagging
turned off.
Client 3 is a member of VLAN 1, and can communicate only with the Main Server
and Client 5. Tagging is not enabled on Client 3’s switch port.
Client 4 is a member of VLAN 3, and can communicate only with the servers.
Tagging is not enabled on Client 4’s switch port.
Client 5 is a member of both VLANs 1 and 2, and has a Sun GigaSwift Ethernet
adapter installed. It is connected to switch port 10. Both the adapter and the switch
port are configured for VLANs 1 and 2 and have tagging enabled.
VLAN tagging is only required to be enabled on switch ports that create trunk links
to other VLAN-aware Ethernet switches, or on ports connected to tag-capable end-
stations, such as servers or workstations with VLAN-aware adapters.