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Cisco Bug: CSCus81465 - Nexus 3500: Active Buffer Monitoring syslog msg logged even after traffic drops below threshold

Last Modified

Feb 28, 2017

Products (2)

  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 3548 Switch

Known Affected Releases

6.0(2)A4(3)

Description (partial)

Symptom:
In Nexus 3500, Active Buffer Monitoring (AMB) feature continuous syslog messages reported, even after the traffic rate and buffer usage drops below threshold.

Sample log message:

N3K# show hardware profile buffer monitor multicast 1 brief 
Brief CLI issued at: 02/05/2015 12:31:48 <===
                     Maximum buffer utilization detected
                   1sec     5sec    60sec     5min      1hr
                  ------   ------   ------   ------   ------
Mcast Usage 1        0KB      0KB   3840KB   3840KB   3840KB

N3K# show logging log
2015 Feb  5 12:41:09.419421 N3K-5-222 %MTC_USD-5-BUFFER_MONITOR_THRESHOLD_REACHED: KBytes                 384  768 1152 1536 1920 2304 2688 3072 3456 3840 4224 4608 4992 5376 5760 6144 
2015 Feb  5 12:41:09.419467 N3K-5-222 %MTC_USD-5-BUFFER_MONITOR_THRESHOLD_REACHED:                       ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 
2015 Feb  5 12:41:09.419810 N3K-5-222 %MTC_USD-5-BUFFER_MONITOR_THRESHOLD_REACHED: 02/05/2015 12:41:09      0    0    0    0    0    0    0    0    0  255    0    0    0    0    0    0

Conditions:
Issue is seen in Nexus 3500 platform running 6.x(A4) releases.
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