The restored interface is shut down again if the interface receives BPDUs again or the link is considered unavailable in a specified time. After the delay, the interface goes Up automatically. To configure the interface to restore to the Up state automatically, run the error-down auto-recovery command to set an auto If the port-security protect-action command sets the security protection action to shutdown, the interface is shut down when the number of learned secure MAC addresses reaches the limit.įor details, see port-security protect-action and port-security enable.īy default, an interface can only be resumed by a network administrator after being shut down. In this manner, all services on the interface are interrupted.Īfter port security is enabled on an interface, MAC addresses learned by the interface change to secure dynamic MAC addresses. Then the system sets the administrative status of the interface to Down. You can associate an EFM crossing event with an interface. 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 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. The efm trigger error-down command associates an error event with an interface. As a result, all services on the edge port are interrupted. 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
Cause for an Interface in Error-down State
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