No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search


To have a better experience, please upgrade your IE browser.


CLI-based Configuration Guide - IP Unicast Routing

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

Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
OSPF Smart-discover

OSPF Smart-discover


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


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.


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.

Updated: 2019-12-27

Document ID: EDOC1000174069

Views: 188997

Downloads: 316

Average rating:
This Document Applies to these Products

Related Version

Related Documents

Previous Next