Trouble Ticket 4
You receive the following trouble ticket:
For vendor interoperability reasons, a company changed its routing protocol from EIGRP to OSPF. The network was divided into areas, and all interfaces were instructed to participate in OSPF. The configuration was initially working. However, now none of the routers have full reachability to all the subnets.
This trouble ticket references the topology shown in Figure 21-4.
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