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The purpose of a VLAN is to keep separations within the same involvement. &nbsp;However, it is possible to get what you want to work via helper IP's in VLAN 2 and VLAN 3 say x.x.x.2 and x.x.x.3<br />
<br />
Also, you can add in static routes in the route table of the PC's so that they are aware the other VLAN's / IP ranges exist.<br />
<br />
I would first go with the helper IP addresses as shown below.<br />
<br />
sw1(config)#VLAN 2<br />
sw1(config-if)#ip helper-address x.x.x2<br />
sw1(config)#VLAN 3<br />
sw1(config-if)#ip helper-address x.x.x.3<br />
<br />
You may have to adjust the helper address based on your network's gateway. The pc's not in VLAN's 2 or 3 should be be able to ping these helper addresses if configured correctly. The backup would be the static route on the PC's host table.
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The purpose of a VLAN is to keep separations within the same involvement.  However, it is possible to get what you want to work via helper IP's in VLAN 2 and VLAN 3 say x.x.x.2 and x.x.x.3

Also, you can add in static routes in the route table of the PC's so that they are aware the other VLAN's / IP ranges exist.

I would first go with the helper IP addresses as shown below.

sw1(config)#VLAN 2
sw1(config-if)#ip helper-address x.x.x2
sw1(config)#VLAN 3
sw1(config-if)#ip helper-address x.x.x.3

You may have to adjust the helper address based on your network's gateway. The pc's not in VLAN's 2 or 3 should be be able to ping these helper addresses if configured correctly. The backup would be the static route on the PC's host table.

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Do you have SVIs (VLAN interfaces) for the two interfaces?<br />
<br />
Have you configured the PCs to use the VLAN interface IP address as the default gateway?
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Do you have SVIs (VLAN interfaces) for the two interfaces?

Have you configured the PCs to use the VLAN interface IP address as the default gateway?

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thanks, resolved by enabling ip route.
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I have a stack of 3750 switches, two members. <br />
<br />
I just setup two vlans - Vlan 2 and Vlan 3, but PCs on different vlan can't ping each other.<br />
<br />
Could you please advise what to do? thanks
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I have a stack of 3750 switches, two members. 

I just setup two vlans - Vlan 2 and Vlan 3, but PCs on different vlan can't ping each other.

Could you please advise what to do? thanks

How to make vlan communicates each other

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Switches / Hubs

Network design and methodology, also known as network architecture, is the design of a communication network. It is a framework for the specification of a network's physical components and their functional organization and configuration, its operational principles and procedures, as well as data formats used in its operation. In telecommunication, the specification of a network architecture may also include a detailed description of products and services delivered via a communications network, as well as detailed rate and billing structures under which services are compensated.