Lenovo ThinkSystem NE2552E Application Manual page 319

Using VLANs to Segregate Broadcast Domains
1. Determine which switch ports and IP interfaces belong to which VLANs.
2. Add the switch ports to their respective VLANs.
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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 create 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.
The following table adds port and VLAN information:
Table 28.
Subnet Routing Example: Optional VLAN Ports
VLAN Devices
1 First Floor Client
Workstations
Second Floor Client
Workstations
2 Primary Default Router
Secondary Default Router
3 Common Servers 1
Common Servers 2
The VLANs shown in Table
NE2552E(config)# vlan 1
NE2552E(config-vlan)# exit
NE2552E(config)# interface port ext1,ext2 (Add ports to VLAN 1)
NE2552E(config-if)# switchport mode trunk
NE2552E(config-if)# switchport trunk allowed vlan add 1
NE2552E(config-if)# exit
NE2552E(config)# vlan 2
NE2552E(config-vlan)# exit
NE2552E(config)# interface port ext3,ext4 (Add ports to VLAN 2)
NE2552E(config-if)# switchport mode trunk
NE2552E(config-if)# switchport trunk allowed vlan add 2
NE2552E(config-if)# exit
NE2552E(config)# vlan 3
NE2552E(config-vlan)# exit
NE2552E(config)# interface port inet5a,int6a (Add ports to VLAN 3)
NE2552E(config-if)# switchport mode trunk
NE2552E(config-if)# switchport trunk allowed vlan add 3
NE2552E(config-if)# exit
IP Interface
2
3
1
1
4
4
28 are configured as follows:
Switch Port VLAN #
EXT1 1
EXT2 1
EXT3 2
EXT4 2
INT5A 3
INT6A 3
Chapter 21: Basic IP Routing
319