Using Vlans To Segregate Broadcast Domains; Configuration Example - IBM RackSwitch G8000 Application Manual

Using VLANs to Segregate Broadcast Domains

Configuration Example

Table 16. Subnet Routing Example: IP Address Assignments
Subnet
1
2
3
4
Table 17. Subnet Routing Example: IP Interface Assignments
Interface
IF 1
IF 2
IF 3
IF 4
Table 18. Subnet Routing Example: Optional VLAN Ports
Devices
Default router
Web servers
Database servers
Terminal Servers
© Copyright IBM Corp. 2011
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.
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:
Devices
Default router
Web servers
Database servers
Terminal Servers
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:
Devices
Default router
Web servers
Database servers
Terminal Servers
3. Determine which switch ports and IP interfaces belong to which VLANs.
The following table adds port and VLAN information:
IP Interface
Note: To perform this configuration, you must be connected to the switch
Command Line Interface (CLI) as the administrator.
IP Addresses
205.21.17.1
100.20.10.2-254
131.15.15.2-254
206.30.15.2-254
IP Interface Address
205.21.17.3
100.20.10.1
131.15.15.1
206.30.15.1
Switch Ports
1 22
2 1 and 2
3 3 and 4
4 5 and 6
VLAN #
1
2
3
4
Chapter 15. Basic IP Routing
185