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:
<HUAWEI> display current-configuration interface GigabitEthernet 1/0/0
interface GigabitEthernet1/0/0
carrier down-hold-time 100
carrier up-hold-time 10
<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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