A false positive alarm is generated for the master interface of redundancy interface configuration. There are 2 workarounds available to clear the alarm. The fix is implemented in XOS 9.6.3 and above, and it is also targeted to be included in XOS 9.5.7A false positive Link Down alarm is generated for an interface and it does not clear. Though the alarm is present, the interface seems fine as observed via the cli command 'show interface'.
Here is an example of an alarm that was generated on an XOS 9.5.5 system where gig 1/12 was the master interface.:
Alarm Id : 12343
Brief Description : Link down 1/12
Date : Tue Apr 10 18:21:48 2012
Severity : Minor
Alarm Name : linkFailure
Alarm Source : np1
Slot : slot 1
Module : np1
Interface : Gige Link 12
Ethernet Speed : 10gigabitethernet
Probable Cause : Link Down
Event Type : Equipment Alarm
User Clearable : false
Extended Description : The specified link is down.
Repair Action : Check all physical connections to the affected
: port. Check connections to any external devices. If
: this does not resolve the issue, contact customer
Problem: A false positive Link Down alarm is generated for an interface, where it is the master interface of the redundant-interface configuration. The alarm is triggered when the traffic is passing through the backup interface and then a configuration change is made for the master interface.
The fix for this issue has been implemented in XOS 9.6.3 and above, and it is also targeted to be included in XOS 9.5.7