In this tutorial, we are going to set up a simple routed LAN. The scenario will illustrate how you would connect multiple workgroup switches, configure & route between VLANs. The following is a diagram illustrating how we are going to interconnect the core layer 3 switch with the three workgroup switches.
The design is simple. One VLAN and subnet per workgroup switch. Each end user that connects to a workgroup switch will point to the appropriate layer 3 VLAN interface on the core switch as its default gateway. Because the core switch is a layer 3 switch (router), we must configure both layer 2 VLANS & layer 3 VLAN interfaces. Here’s the configuration:
Typically by default, the vlan1 (layer 3) interface is already in the Cisco switch configuration. In this particular design, you should administratively shut down the interface. Also, make sure you assign the correct VLAN to the access ports that are cabled up to client's workstations. The default per-port setting (vlan 1) will not work in this environment.
| SYNTAX | DESCRIPTION |
layer 3 switch |
|
| conf t | Enter global configuration mode |
| vlan 10 | Creates (layer 2) VLAN 10 |
| vlan 20 | Creates (layer 2) VLAN 20 |
| vlan 30 | Creates (layer 2) VLAN 30 |
| exit | Leaves vlan-config mode |
| interface f0/1 | Enter interface-config mode |
| switchport access vlan 10 | Assigns port to VLAN 10 |
| interface f0/2 | Enter interface-config mode |
| switchport access vlan 20 | Assigns port to VLAN 20 |
| interface f0/3 | Enter interface-config mode |
| switchport access vlan 30 | Assigns port to VLAN 30 |
| exit | Leaves interface-config mode |
| interface vlan10 | Creates layer 3 VLAN interface |
| ip address 10.1.1.1 255.255.255.0 | Assigns IP address to interface (gateway address for VLAN 10) |
| no shut | Enables interface |
| interface vlan20 | Creates layer 3 VLAN interface |
| ip address 10.1.2.1 255.255.255.0 | Assigns IP address to interface (gateway address for VLAN 20) |
| no shut | Enables interface |
| interface vlan30 | Creates layer 3 VLAN interface |
| ip address 10.1.3.1 255.255.255.0 | Assigns IP address to interface (gateway address for VLAN 30) |
| no shut | Enables interface |
| SYNTAX | DESCRIPTION |
workgroup switch 1 |
|
| conf t | Enter global configuration mode |
| vlan 10 | Creates (layer 2) VLAN 10 |
| interface vlan10 | Creates layer 3 VLAN interface |
| ip address 10.1.1.2 255.255.255.0 | Assigns IP address to switch for management |
| no shut | Enables interface |
| interface f0/1 | Enter interface-config mode |
| switchport access vlan 10 | Assigns port to VLAN 10 (do the same for every user port that will be off vlan 10). |
| exit | Return to global-config mode |
| ip default-gateway 10.1.1.1 | Creates default route for management purposes |
| SYNTAX | DESCRIPTION |
workgroup switch 2 |
|
| conf t | Enter global configuration mode |
| vlan 20 | Creates (layer 2) VLAN 20 |
| Interface vlan20 | Creates layer 3 VLAN interface |
| ip address 10.1.2.2 255.255.255.0 | Assigns IP address to switch for management |
| no shut | Enables interface |
| interface f0/1 | Enter interface-config mode |
| switchport access vlan 20 | Assigns port to VLAN 20 (do the same for every user port that will be off vlan 20). |
| exit | Return to global-config mode |
| ip default-gateway 10.1.2.1 | Creates default route for management purposes |
| SYNTAX | DESCRIPTION |
workgroup switch 3 |
|
| conf t | Enter global configuration mode |
| vlan 30 | Creates (layer 2) VLAN 30 |
| interface vlan30 | Creates layer 3 VLAN interface |
| ip address 10.1.3.2 255.255.255.0 | Assigns IP address to switch for management |
| no shut | Enables interface |
| interface f0/1 | Enter interface-config mode |
| switchport access vlan 30 | Assigns port to VLAN 30 (do the same for every user port that will be off vlan 30). |
| exit | Return to global-config mode |
| ip default-gateway 10.1.3.1 | Creates default route for management purposes |
