ALM-303046956 Interface Has Turned into DOWN State

Description

WLAN/4/AP_STP_AUTO_SHUTDOWN:OID [OID] Interface has turned into DOWN state. (APMAC=[OPAQUE], APName=[STRING], ApIfIndex=[INTEGER], ApEntityPhysicalName=[OCTET], APID=[INTEGER])

An alarm is generated when STP detects a local loopback and triggers port shutdown.

Attribute

Alarm ID	Alarm Severity	Alarm Type
303046956	Warning	equipmentAlarm

Parameters

Name	Meaning
OID	Indicates the MIB object of the alarm.
APMAC	Indicates the MAC address of the AP.
APName	Indicates the AP name.
ApIfIndex	Indicates the AP interface index.
ApEntityPhysicalName	Indicates the AP interface name.
APID	Indicates the AP ID.

Impact on the System

When STP detects a local loopback, it determines that a network storm occurs and will trigger shutdown of the local interface to prevent the storm from affecting services on the entire network; however, services on the shutdown interface will be interrupted.

Possible Causes

After STP detects a loopback on an interface, the device shuts down the interface to prevent a loop.

Procedure

Check whether local loopback is configured on the interface where the alarm is generated.
- Y=>4
- N=>2
Check whether a hub is incorrectly connected on the network connected to the interface.
- Y=>5
- N=>3
Collect alarm information, log information, and configuration information, and then contact technical support personnel.
Delete configurations that cause the local loopback.
Remove the self-looped cable.
End