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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

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OSPF Smart-discover

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.

Table 5-11 OSPF Smart-discover

Smart-discover Configured or Not

Processing

Smart-discover is not configured

  • Hello packets are sent only when the Hello timer expires.

  • The gap between the sending of two Hello packets is the Hello interval.

  • Neighbors keep waiting to receive Hello packets within the Hello interval.

Smart-discover is configured

  • Hello packets are sent directly regardless of whether the Hello timer expires.

  • Neighbors can receive packets rapidly and perform status transition immediately.

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.

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Updated: 2019-12-27

Document ID: EDOC1000174069

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