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10. A Survivable Internet Solution for a... > Proposed Solution 2: OSPF over Tunne...

Proposed Solution 2: OSPF over Tunnels

After discussing the first solution and having it shot down, we decided to revisit the design to eliminate changes to the managed routers. The next proposed solution was to use generic routing encapsulation (GRE) tunnels to connect the Juniper Systems Netscreen firewalls. The GRE tunnels would form a secondary mesh between the sites. This mesh would be used to pass the default route information between sites. A depiction of the proposed solution is shown in Figure 10-4.

OSPF over tunnels

Figure 10-4. OSPF over tunnels

Early Death of Solution 2

When solution 2 was prototyped in the lab, the initial tests showed that it was feasible. But when the MPLS core was added to the prototype, some issues appeared that caused this solution to be shelved:


  

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