© 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
.
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
Summary of Contents for RackSwitch G8000
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