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Brocade Network Advisor reports false events for Oper Status changed to offline for switch management interfaces.

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TitleBrocade Network Advisor reports false events for Oper Status changed to offline for switch management interfaces.
Symptoms
From the Brocade Network Advisor(BNA)server, management server events were logged for access to the management IPs of multiple VDX6720 switches being managed. (This is a BNAissue so could be seen with NOS/FOS or IP switches being managed, but the example here is a NOS switch.)
Example offline and online event.
Network Advisor E-mail Report - Management Server Event

Network Advisor Version: 11.3.0
Network Advisor Build: 189
Network Advisor Server Address: 10.XXX.XXX.XXX ( BNA IP )
Date: Sun Nov 18 03:46:43 IST 2012
Event: Device Oper Status changed to offline for device: [10.XXX.XXX.XXX] ( VDX eth0 ip )
Severity: Critical

Network Advisor Version: 11.3.0
Network Advisor Build: 189
Network Advisor Server Address: 10.XXX.XXX.XXX ( BNA IP )
Date: Sun Nov 18 03:49:41 IST 2012
Event: Device Oper Status changed to online for device: [10.XXX.XXX.XXX]( VDX eth0 ip )
Severity: Notice
These were found to be false events as the VDX management interface eth0 hadnotgone offline and the management access for the switch(es)were alwaysavailable during the offline/online events.
Environment
Software Release: BNA 11.3.0
Fixed in Version: BNA 11.3.0a, 12.1.0
Cause
If the ICMP ping from BNA to the target device does not get a response on the first ping then the device status is changed to offline.
Resolution
This issue is resolved in BNA release 11.3.0a and 12.1.0. The BNA ping test from 11.3.0a onwards allows for three retries before marking a device as offline to avoid false offline events.
Additional notes
To disable monitoring untilBrocade Network Advisor can be updated as a fix.

From the BNA sever G.U.I:
Server Options -> Software Configuration -> IP Preferences -> OperPollingService ->
EnablePingsForSwitches (uncheck box)

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