Backup internet static config

grandarcmaster

Hey guys, I hope you can help me with my assignment.

Ive had to design a network for an assignment at school. And im having some trouble. Basically, the network consists of 4 sites, 1 core network and 3 brand offices. I have the 3 offices connected to the core network via direct metro ethernet connections. All of the 4 sites have their own internet connection using adsl2+.

Now the part i cant work out. My assignment requires all sites have their own internet connection, but when the internet connection fails locally, the sites will then access the internet via the core.

I cant wrap my head around this.

I hope you guys might be able to help me with this.
Thanks

P.S. My teacher said just to give the internet connections a random 203.x.x.x ip if that helps in anyway. Thanks again.

mikej412

We won't do your homework for you .... but we can strongly suggest that you look at the Administrative Distance option on the command you'd use to set a static route.

If you set one static route (or static default route) using your Metro Ethernet, and another static route (or static default route) using the Internet -- it would use the route that has the lowest Administrative Distance.

If your Metro Ethernet went down, that static route (or static default route) would be removed from the routing table. The routing process would then check to see if it had any other options for that route (perhaps one with a higher Administrative Distance than the failed link) that it could put into the routing table instead (to replace that failed Metro Ethernet link).