Troubleshooting Miscellaneous OSPFv2 Issues

So far, your focus has been on troubleshooting issues related to OSPFv2 neighbor relationships and routes. Now your focus will be on tracking LSAs through the network, route summarization, discontiguous areas, load balancing, and default routes.

Tracking OSPF Advertisements Through a Network

When troubleshooting an OSPF issue, tracking the path of OSPF advertisements can be valuable in determining why certain entries are in a router’s LSDB.

As an example, notice network 192.168.1.0/24 in the topology provided in Figure 15-8, and consider how this network is entered into the LSDB of the other OSPF routers.

Figure 15-8 Tracking an OSPF Advertisement

The following steps describe how network ...

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