If all you did was type 'ip routing' on the switches, you probably lost your default gateway.

With ip routing disabled, the switch relies on the 'ip default-gateway' command to see how to communicate with other networks.

Once you enable ip routing, we no longer use the 'ip default-gateway' command, but instead look in your routing table to see where to send packets.

To fix this, log into the switch and look for a command looking like this:

ip default-gateway 10.1.1.1

and convert it to this:

ip route 0.0.0.0 0.0.0.0 10.1.1.1