VLANs managed / unmanaged switches

solidrumor
solidrumor used Ask the Experts™
on
I have a managed switch with 3 VLANs associated with it. Is it possible to attach an unmanaged switch to the managed switch and have all of the VLAN traffic pass to the unmanaged switch?I have three clients each from a different subnet attached to the unmanaged switch. I would like these three clients to be able to communicate with the rest of the clients in the three VLANs and themselves.
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Sr. Network Engineer
Commented:
You will need to set up your unmanaged switch in its own vlan, then utilize a layer 3 interface to route between the vlans.  

Ex:

unmanaged switch vlan 1 and trunked to managed switch
managed switch vlans 2, 3, 4, 5, etc. and trunked to unmanaged switch
managed switch configured with layer three interface or connected to router w/router on a stick design.
Hi,

The managed switch will act as a layer 3 switch with the 3 vlans (subnets) attached.
Run a trunk between the managed and the unmanaged switch and pass three vlans on the trunk for example(10,20,30).Assign the 3 clients to each of the vlans on the unmanaged switch. You also may assign one ip address to the unmanaged switch in order to be able to manage it remotely(telnet/http).
The client on the unmanaged switch should have his gateway set to one of the interface vlans on the layer 3 switch to be able to be routed and communicate with other devices on the subnet.

On Main Managed/Core switch

vlan 10,20,30
interface vlan 10
ip add 10.10.10.1 255.255.255.0
interface vlan 20
ip add 20.20.20.1 255.255.255.0
interface vlan 30
ip add 30.30.30.1 255.255.255.0

Create a trunk between the two switches
int fastethernetx/y
switchport trunk enc dot1q
switchport mode trunk
switchport trunk allowed vlan 10,20,30
exit

Same from both sides.

3 clients should be assigned to each of the three vlans and gateways will be on Core switch.
I hope this helps.The configuration is on Cisco device,but the concept is the same!
Hi,

The managed switch will act as a layer 3 switch with the 3 vlans (subnets) attached.
Run a trunk between the managed and the unmanaged switch and pass three vlans on the trunk for example(10,20,30).Assign the 3 clients to each of the vlans on the unmanaged switch. You also may assign one ip address to the unmanaged switch in order to be able to manage it remotely(telnet/http).
The client on the unmanaged switch should have his gateway set to one of the interface vlans on the layer 3 switch to be able to be routed and communicate with other devices on the subnet.

On Main Managed/Core switch

vlan 10,20,30
interface vlan 10
ip add 10.10.10.1 255.255.255.0
interface vlan 20
ip add 20.20.20.1 255.255.255.0
interface vlan 30
ip add 30.30.30.1 255.255.255.0

Create a trunk between the two switches
int fastethernetx/y
switchport trunk enc dot1q
switchport mode trunk
switchport trunk allowed vlan 10,20,30
exit

Same from both sides.

3 clients should be assigned to each of the three vlans and gateways will be on Core switch.
I hope this helps.The configuration is on Cisco device,but the concept is the same!

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