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[Configuration and Deployment Instructions] Configure the System to Respond to the Down Event of a Physical Interface After a Delay

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Configure the System to Respond to the Down Event of a Physical Interface After a Delay or Enable the Device Management Module to Report an Interface Down Alarm after a Delay


Scenario

A Huawei device connects to a WDM or transmission device through physical interfaces.


Configuration Requirements

  • Ethernet/GE/10G LAN/40GE/100GE

    The carrier down-hold-time interval command must be run to set a period after which the system responds to an interface Down event. For details, see Configuring the Hold-Time Interval After an Interface Becomes Up/Down.

  • Other types of interfaces

    The transmission-alarm holdoff-timer holdoff-time command must be run to enable the device management module to report an interface Down alarm after a delay. For details, see Setting the Interval for Filtering Transmission Alarms.

Misconfiguration Risks

Risk description:

Switching of the WDM or transmission device may cause the interface of the connected Huawei device to frequently go Up and Down, resulting in a service interruption on the interface.

Identification method:

Run the display current-configuration [ interface [ interface-type [ interface-number ] ] ] command in the user view to check the delay after which the system responds to the interface Down event. The following uses the command output on a GE interface as an example. If carrier down-hold-time is 0, the risk exists.
<HUAWEI> display current-configuration interface GigabitEthernet 1/0/0
interface GigabitEthernet1/0/0
carrier down-hold-time 100
carrier up-hold-time 10
Run the display transmission-alarm configuration [ interface-type interface-number ] command in the user view to check alarm customization and suppression configuration on an interface. The following uses the command output on a GE interface as an example. If Holdtime is 0, the risk exists.
<HUAWEI> display transmission-alarm configuration gigabitethernet 1/2/0
 Interface: GigabitEthernet1/2/0
  Filter function: enabled (Holdtime is 55)
  Damping function: enabled
  Suppress value: 999
  Ceiling value: 6000
  Reuse value: 500
  OK half decay value: 500
  NG half decay value: 1000 

Recovery measures:

For Ethernet/GE/10G LAN/40GE/100GE interfaces, run the carrier down-hold-time interval command to set a period after which the system responds to an interface Down event. For other types of interfaces, run the transmission-alarm holdoff-timerholdoff-time command to enable the device management module to report an interface Down alarm after a delay.


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The post is synchronized to: Configuration and Deployment Instructions

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