Although VLANs are commonly used to create individual broadcast domains and/ or separate IP subnets, it is sometimes useful for a server to have a presence on more than one VLAN simultaneously. Several Sun products support multiple VLANs on a per port or per interface basis, allowing very flexible network configurations.
FIGURE 5-1 shows an example network that uses VLANs
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VLAN 1
VLAN 2
VLAN 3
Accounting |
Server |
(VLAN 3) |
Main Server |
Adapter |
Gigabit/Tagged |
(All VLANs) |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
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| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
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Shared Media Segment
Software | Software | Engineering | Accounting | Engineering/ |
PC 1 | PC 2 | PC 3 | PC 4 | Software PC 5 |
(VLAN 2) | (VLAN 2) | (VLAN 1) | (VLAN 3) | Adapter |
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FIGURE 5-1 Example of Servers Supporting Multiple VLANs with Tagging Adapters
The example network has the following features:
■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.
■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 via 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.
46 Sun GigaSwift Ethernet Adapter Installation and User’s Guide • February 2001
