Network Topology FIG follows:
The picture above shows an asset management company's network topology, the network run OSPF protocol, where the data center are 0, Beijing workplace as area 10, the headquarters office for the area 20, by two Unicom and Telecom MSTP between three sites Internet line, which Beijing headquarters office and workplace has its own export Internet access, design requirements are as follows:
1. Data center are0 send the default route through the lower ospf, the default route does not allow Beijing headquarters office and workplace access internet, even if Beijing headquarters office and workplace export of local Internet link failure
2. Beijing headquarters office and the workplace through their local internet link to access the Internet, and mutual backup, that is, when Beijing local Internet link failure workplace go local internet export headquarters office, otherwise go to Beijing headquarters of the local office internet link failure local internet link workplace