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

Reminder

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

upgrade

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).
Configuring Attributes for Hello Packets

Configuring Attributes for Hello Packets

Context

IS-IS maintains neighbor relationships between neighbors by sending and receiving Hello packets. If the local device does not receive Hello packets from its neighbor within a specified period, the device considers the neighbor Down.

In IS-IS, you can set the interval for sending Hello packets and the holding multiplier of neighboring devices to control the holdtime of neighbor relationships between the local device and neighbors.
  • If the interval for sending Hello packets is too short, more system resources are consumed to send Hello packets, causing a heavy CPU load.
  • If the holdtime of neighboring devices is too long, the local device needs to spend much time detecting the failure of neighbors, slowing down IS-IS route convergence. If the holdtime of neighboring devices is too short, some Hello packets may be lost or become incorrect because of network transmission delay and errors. This will cause neighbor relationships to frequently alternate between Up and Down and lead to route flapping on the IS-IS network.
    NOTE:

    You are advised to set the same interval for sending Hello packets and same holding multiplier of neighboring devices on all the devices on the IS-IS network. This method prevents IS-IS route convergence from being slowed down when some devices detect link failures at a lower speed than other devices.

Procedure

  • Configure the interval for sending Hello packets.
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run isis timer hello hello-interval [ level-1 | level-2 ]

      The interval for sending Hello packets is set on an interface.

      By default, the interval for sending Hello packets 10 seconds.

      NOTE:

      Parameters level-1 and level-2 are configured only on a broadcast interface.

      On a broadcast link, there are Level-1 and Level-2 Hello packets. For different types of packets, you can set different intervals. If no level is specified, both the Level-1 timer and Level-2 timer are configured. On a P2P link, there are only one type of Hello packets. Therefore, neither level-1 nor level-2 is required.

  • Set the holding multiplier for neighboring devices.
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run isis timer holding-multiplier number [ level-1 | level-2 ]

      The holding multiplier of neighboring devices is set.

      The default holding multiplier is 3. The holdtime of neighbor relationships is three times the interval for sending Hello packets.

      NOTE:

      Parameters level-1 and level-2 are configured only on a broadcast interface.

Translation
Download
Updated: 2019-05-17

Document ID: EDOC1000174069

Views: 113835

Downloads: 254

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Share
Previous Next