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Alteon OS Application Guide
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Chapter 8: Basic IP Routing 42C4911, January 2007
Using VLANs to Segregate Broadcast Domains
In the previous example, devices that share a common IP network are all in the same broadcast
domain. If you want to limit the broadcasts on your network, you could use VLANs to create
distinct broadcast domains. For example, as shown in the following procedure, you could cre-
ate one VLAN for the client trunks, one for the routers, and one for the servers.
In this example, you are adding to the previous configuration.
1. Determine which switch ports and IP interfaces belong to which VLANs.
The following table adds port and VLAN information:
2. Add the switch ports to their respective VLANs.
The VLANs shown in Table 8-3 are configured as follows:
Table 8-3 Subnet Routing Example: Optional VLAN Ports
VLAN Devices IP Interface Switch Port VLAN #
1 First Floor Client Workstations 2 EXT1 1
Second Floor Client Workstations 3 EXT2 1
2 Primary Default Router 1 EXT3 2
Secondary Default Router 1 EXT4 2
3 Common Servers 1 4 INT5 3
Common Servers 2 4 INT6 3
>> # /cfg/l2/vlan 1 (Select VLAN 1)
>> VLAN 1# add port EXT1 (Add port for 1st floor to VLAN 1)
>> VLAN 1# add port EXT2 (Add port for 2nd floor to VLAN 1)
>> VLAN 1# ena (Enable VLAN 1)
>> VLAN 1# ../VLAN 2 (Select VLAN 2)
>> VLAN 2# add port EXT3 (Add port for default router 1)
>> VLAN 2# add port EXT4 (Add port for default router 2)
>> VLAN 2# ena (Enable VLAN 2)
>> VLAN 2# ../VLAN 3 (Add port for default router 3)
>> VLAN 3# add port INT5 (Select VLAN 3)
>> VLAN 3# add port INT6 (Select port for common server 1)
>> VLAN 3# ena (Enable VLAN 3)