Other OSPF Issues
OSPFv2 can have a few other problems, two of which Cisco included in the OSPF troubleshooting exam topics. This last short discussion in this chapter looks at these two additional topics: the OSPF network type and the interface maximum transmission unit (MTU) size.
Mismatched OSPF Network Types
OSPF defines a concept for each interface called a network type. The OSPF network type tells OSPF some ideas about the data link to which the interface connects. In particular, the network type tells a router:
Whether the router can dynamically discover neighbors on the attached link (or not)
Whether to elect a DR and BDR (or not)
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