Note: The experience you'll get on this lab will vary greatly depending on your hardware. On a router running in a Virtual Machine, or a sofware driven router like a J-Series you don't have much separation between the forwarding plane and the control plane -- so you won't see to much effect. These routers are perfectly capable of helping others restart though! For the full effect, you need a pair of routers that have complete separation between the control plane and the forwarding plane like an M, MX or T series router.