tell the router to use one link over another by assigning an administrative dis- tance. In this case, we assign 200 to one link and 201 to the other in the fol- lowing code. The link used will be the link with the lowest administrative distance.
F I G U R E 9 . 5
Configuring static routes to multiple ISPs
RouterA(config)#ip route 0.0.0.0 0.0.0.0 serial 0 ?