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S9300, S9300E, and S9300X V200R012C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, Voice VLAN, VLAN mapping, QinQ, GVRP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, HVRP, and Layer 2 protocol transparent transmission.
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(Optional) Setting the Timeout Interval of Hello Packets

(Optional) Setting the Timeout Interval of Hello Packets


If the backup device in an E-Trunk does not receive any hello packet from the master device within the timeout interval (as specified in the hello packets sent by the master device), the backup device becomes the master.


When E-Trunk is working normally, changing the hello packet sending interval or timeout interval may cause flapping of the E-Trunk between master and backup. Before changing the hello packet sending interval or timeout interval, you are advised to configure member Eth-Trunks to work in forcible master/backup state. After the new configuration takes effect, restore the working mode to automatic.


  1. Run system-view

    The system view is displayed.

  2. Run e-trunk e-trunk-id

    The E-Trunk view is displayed.

  3. Run timer hello hello-times

    The interval for sending hello packets is set.

    By default, the value of hello-times is 10. The unit is 100 ms, so the default interval is 1s.

  4. Run timer hold-on-failure multiplier multiplier

    The time multiplier for detecting hello packets is set.

    The remote device checks the timeout interval in the received hello packet to check whether the local device times out. If the remote device is the backup and does not receive hello packets from the local device within the timeout interval, the remote device becomes the master.

    The timeout interval is calculated using the following formula:

    Timeout interval = Interval for sending hello packets x Time multiplier

    The default time multiplier is 20. It is recommended that you set the time multiplier to 3 or more.

Updated: 2019-01-18

Document ID: EDOC1100038290

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