Basic vlan on cisco 3560 with cable modem as router

This is mostly for my own notes, but maybe someone might need the info.

CREATE VLAN(S)

conf t
vlan 10
name PRODUCTION
vlan 20
name DEVELOPMENT
exit
exit
show vlan

You will see something like this:

Assign the IPs to the vlans.  This will let you route to them

conf t
interface vlan 10
 ip address 192.168.10.2 255.255.255.0
 no shutdown

interface vlan 20
 ip address 172.20.20.1 255.255.255.0
 no shutdown
exit
exit

Review the status of your work:
show ip interface brief

You will see something like this:

Make sure your switch is routing
conf t
ip routing

shouldn't show anything really.

Assign some ports to the switch. 
Here is what the current switch looks like.
We are assigning port 3 to vlan 10 and port 4 to vlan 20


interface gigabitEthernet 0/3
switchport access vlan 10
exit
interface gigabitEthernet 0/4
switchport access vlan 20
exit
exit
show vlan
You'll see something like this:

show ip interface brief

You will need to have something plugged into the ports before you can ping from the switch

Once up, you will need to add in a route to get there.
In this example, i'm just using an ISP cable modem, so it looked like this:



The destination network is 172.20.20.0 and the gateway is the default vlan 1 IP of the switch