© Copyright IBM Corp. 2011 Chapter 15. Basic IP Routing 185
Using VLANs to Segregate Broadcast Domains
If you want to control the broadcasts on your network, use VLANs to create distinct
broadcast domains. Create one VLAN for each server subnet, and one for the
router.
Configuration Example
This section describes the steps used to configure the example topology shown in
Figure 19 on page 184.
1. Assign an IP address (or document the existing one) for each router and each
server.
The following IP addresses are used:
2. Assign an IP interface for each subnet attached to the switch.
Since there are four IP subnets connected to the switch, four IP interfaces are
needed:
3. Determine which switch ports and IP interfaces belong to which VLANs.
The following table adds port and VLAN information:
Note: To perform this configuration, you must be connected to the switch
Command Line Interface (CLI) as the administrator.
Table 16. Subnet Routing Example: IP Address Assignments
Subnet Devices IP Addresses
1 Default router 205.21.17.1
2 Web servers 100.20.10.2-254
3 Database servers 131.15.15.2-254
4 Terminal Servers 206.30.15.2-254
Table 17. Subnet Routing Example: IP Interface Assignments
Interface Devices IP Interface Address
IF 1 Default router 205.21.17.3
IF 2 Web servers 100.20.10.1
IF 3 Database servers 131.15.15.1
IF 4 Terminal Servers 206.30.15.1
Table 18. Subnet Routing Example: Optional VLAN Ports
Devices IP Interface Switch Ports VLAN #
Default router 1 22 1
Web servers 2 1 and 2 2
Database servers 3 3 and 4 3
Terminal Servers 4 5 and 6 4
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