JN0-363 · Question #60
You are troubleshooting two OSPF routers that have an adjacency that remains in the ExStart state. What would cause this problem?
The correct answer is C. mismatched MTU settings on the OSPF interfaces. The problem occurs most frequently when you attempt to run OSPF between a Cisco router and another vendor router. The problem occurs when the maximum transmission unit (MTU) settings for neighboring router interfaces do not match. If the router with the higher MTU sends a…
Question
You are troubleshooting two OSPF routers that have an adjacency that remains in the ExStart state. What would cause this problem?
Options
- Amismatched OSPF hello intervals on the OSPF interfaces
- Bmismatched authentication settings on the OSPF interfaces
- Cmismatched MTU settings on the OSPF interfaces
- Dmismatched subnet settings on the OSPF interfaces
How the community answered
(32 responses)- A3% (1)
- B6% (2)
- C78% (25)
- D13% (4)
Explanation
The problem occurs most frequently when you attempt to run OSPF between a Cisco router and another vendor router. The problem occurs when the maximum transmission unit (MTU) settings for neighboring router interfaces do not match. If the router with the higher MTU sends a packet larger that the MTU set on the neighboring router, the neighbor router ignores the packet. A mismatched Maximum Transmission Unit (MTU) setting on OSPF interfaces can cause routers to get stuck in the ExStart state. OSPF requires that both sides of a link have the same MTU to form a full adjacency.
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