OSPF Smart-discover
Definition
Generally, Routers periodically send Hello packets through OSPF interfaces. That is, a Router sends Hello packets at the Hello interval set by a Hello timer. Because Hello packets are sent at a fixed interval, the speed at which OSPF neighbor relationship is established is lowered.
Enabling Smart-discover can speed up the establishment of OSPF neighbor relationships in specific scenarios.
Smart-discover Configured or Not |
Processing |
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Smart-discover is not configured |
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Smart-discover is configured |
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Principle
In the following scenarios, the interface enabled with Smart-discover can send Hello packets to neighbors without having to wait for the Hello timer to expire:
The neighbor status becomes 2-way for the first time.
The neighbor status changes from 2-way or a higher state to Init.
