If a network has two exits, one telecommunications, an educational network.
Now : 1, interviews with network resources in Education net exports, telecommunications exports go visit other resources. 2, if the exports of telecommunications failures, network resources can be automatically switched to visit non-educational exports go Education Network; If net exports fault visit educational telecommunications network resources can be automatically switched exports go;
We see many of them are only on the Internet to meet the above condition.
Methods : a routing strategy for export, so floating lines Routing Switch. In fact, achieved the second requirement, because the state only export port for the export of equipment up, floating routing is not in force. If exports of telecommunications lines (fiber) has been broken, but the border states of UP exports of telecommunications routers and routing will not float, which came into force on the Internet can visit the non-educational resources. Routing floating state only export port for the export of equipment DOWN, will come into force.
Method 2 : dynamic routing can also achieve the above requirements, but may result in some mainframe access to external resources, the hope is not going to take occasional exports, resulting in slower visit.
Method 3 : vrrp, hrrp two requirements can be realized, but not simultaneously require almost 1

These are the opinion, if there is a mistake, experts corrected, and consult the best way to achieve the above two requirements? How configuration.