A network engineer is troubleshooting an OSPFv2 network and discovers that two routers connected by a point-to-point WAN serial link are not establishing an adjacency. The OSPF routing process, network commands and area ID are all confirmed as correct, and the interfaces are not passive. Testing shows that the cabling is correct, that the link is up, and pings between the interfaces are successful. What is most likely the problem?
- The subnet masks on the two connected serial interfaces do not match.
- A clock rate has not been set on the DCE interface of the serial link.
- The OSPFv2 process IDs on each router do not match.
- A DR election has not taken place.
Explanation: The establishment of an OSPF adjacency between connected routers requires each interface of the link to be in the same subnet. This requires each interface to be configured with correct IP addresses and the same subnet mask. Pings across serial links can be successful with correct IP addresses and different subnet masks. Successful pings verify that a clock rate has been set on the DCE interface of the serial link. The OSPFv2 process IDs on each router are local and do not need to match. A DR election does not take place across point-to-point serial links between OSPF routers.
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