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Configuration Guide - IP Unicast Routing

CloudEngine 12800 and 12800E V200R002C50

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, and PBR.

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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 controlled by a Dead timer. Because Hello packets are sent at a fixed interval, the establishment of OSPF neighbor relationships is slowed down.

Enabling Smart-discover can speed up the establishment of OSPF neighbor relationships in specific scenarios.

Table 5-11 OSPF Smart-discover

Smart-discover 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.


  • 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, an interface enabled with Smart-discover can send Hello packets to neighbors without waiting for the expiration of the Hello timer:

  • The neighbor status becomes 2-way for the first time.

  • The neighbor status changes from 2-way or a higher state to Init.

Updated: 2019-03-21

Document ID: EDOC1000166601

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