error-down auto-recovery

as-not-ready

When the device negotiates to the AS mode, its port status becomes Down and then becomes Up after services in the service profiles have been delivered.

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auto-defend

After the auto-defend action command is used to configure actions against attack sources, the interface that receives attack packets is shut down to prevent the device from attacks.

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bpdu-protection

On an STP-enabled network where BPDU protection is configured on an edge port, if malicious attackers send bogus BPDUs to attack the switching device, the switching device sets the edge port to Down immediately after the edge port receives BPDUs. As a result, all services on the edge port are interrupted.

For details, see stp bpdu-protection.

efm-remote-failure

The efm trigger error-down command associates an error event with an interface. When EFM detects critical-event, dying-gasp, link-fault, or timeout faults, the protocol status of the interface becomes Down and all services on the interface are interrupted.

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efm-threshold-event

When link monitoring is configured for an interface on a link, the link is considered unavailable, if the number of errored frames, errored codes, or errored frame seconds detected by the interface reaches or exceeds the threshold within a period. You can associate an EFM crossing event with an interface. Then the system sets the administrative status of the interface to Down. In this manner, all services on the interface are interrupted.

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error-statistics

When an Ethernet interface configured with a backup link receives error packets, faults such as packet loss occur. To ensure nonstop service transmission, when the number of received error packets reaches the alarm threshold, the interface is shut down and services are switched to the backup link.

For details, see trap-threshold error-statistics and error-statistics threshold-event trigger error-down.

runts-error-statistics

An interface receives Runts error packets if the optical fiber, network cable, or optical module is removed and reinstalled, the shutdown or undo shutdown command is executed, or Runts packets are forwarded on the network. To avoid worse impact on the device or services, the device counts the number of Runts error packets received by an interface within one minute, and shuts down the interface if the number reaches the alarm threshold 5.

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link-flap

Network cable faults or active/standby switchovers may cause an interface to alternate between Up and Down. You can configure link flapping protection. When the device receives an interface Up/Down message, it checks the interface flapping count and link flapping detection interval. If the interface flapping count reaches the limit within the specified period, the device shuts down interface.

For details, see port link-flap protection enable.

storm-control

After the storm control action is configured as error-down on an interface, the interface is shut down when the average rate of receiving broadcast, multicast, and unknown unicast packets is larger than the specified limit within the interval for detecting storms.

For details, see storm-control action.

port-security

After port security is enabled on an interface, MAC addresses learned by the interface change to secure dynamic MAC addresses. If the port-security protect-action command sets the security protection action to shutdown, the interface is shut down when the number of learned MAC addresses on the interface exceeds the upper limit or static MAC address flapping is detected.

For details, see port-security protect-action and port-security enable.

mac-address-flapping

If the user network where the device is deployed does not support loop prevention protocols, configure a loop prevention action for the device to perform when the device detects MAC address flapping. The device shuts down an interface when detecting MAC address flapping on the interface.

For details, see mac-address flapping detection and mac-address flapping action.

transceiver-power-low

When the optical power of an Ethernet optical interface configured with a backup link is reduced, faults such as packet loss occur. When the optical power is lower than the lower alarm threshold, the interface is triggered to be in Error-Down state and services are switched immediately.

For details, see transceiver power low trigger error-down.

data-integrity-error

After the switch runs for a long time, the chip memory identifier has a data integrity error.

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