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.


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.

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).
Setting the Interval for Sending Hello Packets

Setting the Interval for Sending Hello Packets


Hello packets are commonly used. They are periodically sent on OSPF interfaces to establish and maintain neighbor relationships. The intervals set on interfaces that need to establish an OSPF neighbor relationship need to be the same. Otherwise, the interfaces cannot establish the OSPF neighbor relationship.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The OSPF interface view is displayed.

  3. On an Ethernet interface, run undo portswitch

    The interface is switched to Layer 3 mode.

    By default, an Ethernet interface works in Layer 2 mode.

    The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.


    If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

  4. Run ospf timer hello interval [ conservative ]

    The interval for sending Hello packets is set on the OSPF interface.

    By default, the interval for sending Hello packets on a P2P or broadcast interface is 10s; the interval for sending Hello packets on a P2MP or NBMA interface is 30s; the dead time of the OSPF neighbor on an interface is four times the interval for sending Hello packets on the same interface.

    To speed up OSPF convergence in the case of a link failure, you are advised to configure BFD for OSPF. For details, see Configuring BFD for OSPF. If the remote end does not support BFD for OSPF or you do not want to configure BFD for OSPF, specify conservative when you run the ospf timer hello command. The conservative mode is recommended so that the value of the dead timer configured using the ospf timer dead command takes effect even when the value is less than 10s. Otherwise, if the actual dead timer that takes effect due to the protection mechanism of a device is greater than 10s, services may be affected.

    The interval must be longer than or equal to the active/standby switchover period. Otherwise, a protocol intermittent interruption may occur during the switchover. The default interval for sending Hello packets is recommended.

  5. Run commit

    The configuration is committed.

Updated: 2019-03-21

Document ID: EDOC1000166601

Views: 275762

Downloads: 161

Average rating:
This Document Applies to these Products

Related Version

Related Documents

Previous Next