First off you will need to configure the vlan’s to be routed on the network router. This example will use a Cisco 3750G Layer 3 Switch as a Router.
router> en
router# config t
router(config)# vlan 100
router(config-vlan)# name AccountingVLAN
router(config-vlan)# exit
router(config)# interface vlan 100
router(config-if)# ip address 192.168.50.1 255.255.255.0 <—Default gateway of your VLAN
router(config-if)# des Accounting VLAN Gateway
router(config-if)# exit
router(config)# int gi1/0/24
router(config-if)# switchport trunk encap dot1q
router(config-if)# switchport mode trunk
router(config-if)# switchport trunk allowed vlan 100
router(config-if)# des Uplink to switch
router(config-if)# CTRL-Z
router# wr mem
Now we need to configure the VLAN access ports on the switch trunking VLAN 100. Cisco 3750G switch.
switch> en
switch# config t
switch(config)# vlan 100
switch(config-vlan)# name AccountingVLAN
switch(config-vlan)# exit
switch(config) # int gi1/0/24
switch(config-if) # switchport trunk encap dot1q
switch(config-if)# switchport mode trunk
switch(config-if)# switchport trunk allowed vlan 100
switch(config-if)# des Uplink to router
switch(config-if)# CTRL-Z
switch# wr mem