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Proposed Solution 1

The initial proposed solution was to use the existing routing protocols to advertise the primary and alternate Internet access points. In general, the static routes can be redistributed into other routing protocols (OSPF and BGP). This redistribution allows the default routes (0.0.0.0/0) to be advertised to other routers in the network and between networks. The redistribution can also contain metrics that favor one advertised route over another.

In the case of King Capital, we proposed that the default routes from the Internet routers would be advertised to the local network via the OSPF protocol. At the two data center locations, this default route would also be redistributed into the L3VPN’s BGP protocol, as shown in Figure 10-3. The redistributed default route would be learned by all the other sites and would be used as the alternate Internet access in the event of the loss of the local Internet access.


  

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