In the example network shown in Figure 6, the physical LAN consists of a switch, two servers, and five clients. The LAN is logically organized into three different VLANs, each representing a different IP subnet. The features of this network are described in the following table.
| Example VLAN Network Topology | |
Component | Description | |
VLAN #1 | An IP subnet consisting of the Main Server, PC #3, and PC #5. | |
This subnet represents an engineering group. | ||
| ||
| Includes the Main Server, PCs #1 and #2 via shared media | |
VLAN #2 | segment, and PC #5. This VLAN is a software development | |
| group. | |
VLAN #3 | Includes the Main Server, the Accounting Server and PC #4. | |
This VLAN is an accounting group. | ||
| ||
| A | |
| and IP subnets. The Main Server has an ITI5100G adapter | |
| installed. All three IP subnets are accessed via the single | |
| physical adapter interface. The server is attached to an Alteon | |
Main Server | WebSystems switch Gigabit Ethernet port, which is | |
configured for VLANs #1, #2, and #3. Both the adapter and | ||
| the connected switch port have tagging turned on. Because of | |
| the tagging VLAN capabilities of both devices, the server is | |
| able to communicate on all three IP subnets in this network, | |
| but continues to maintain broadcast separation between all of | |
| them. | |
Accounting | Available to VLAN #3 only. The Accounting Server is | |
isolated from all traffic on VLANs #1 and #2. The switch port | ||
Server | ||
connected to the server has tagging turned off. | ||
| ||
| Attached to a shared media hub that is then connected to the | |
| switch. PCs #1 and #2 belong to VLAN #2 only, and are |
PCs #1 and #2 logically in the same IP subnet as the Main Server and PC #5.
| The switch port connected to this segment has tagging turned |
| off. |
| A member of VLAN #1, PC #3 can communicate only with |
PC #3 | the Main Server and PC #5. Tagging is not enabled on PC |
| #3's switch port. |
PC #4 | A member of VLAN #3, PC #4 can only communicate with | |
the servers. Tagging is not enabled on PC #4's switch port. | ||
| ||
| A member of both VLANs #1 and #2, PC #5 has an ITI5100G | |
PC #5 | 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. | |
Table 9: Example VLAN Network Topology | ||
LSI Logic Corporation | Page 36 of 56 |