Guest

Preview Tool

Cisco Bug: CSCvs34401 - Port-monitor generates txwait random falling-threshold alerts with constant R-RDY delay

Last Modified

Dec 16, 2019

Products (1)

  • Cisco MDS 9000 Series Multilayer Switches

Known Affected Releases

8.3(1) 8.3(2) 8.4(1a) 8.4(2.156)

Description (partial)

Symptom:
Randomly, on a slow port, a Port Monitor txwait falling threshold alert with 'value=0' is followed 1 second later by a txwait rising threshold alert. The following type of syslogs are logged:
<pre>
    2019 Dec  2 16:22:35 mds9396t %PMON-SLOT1-3-RISING_THRESHOLD_REACHED: TXWait has reached the rising threshold (port=fc1/54 [0x1035000], value=96) .
    2019 Dec  2 16:24:07 mds9396t %PMON-SLOT1-3-FALLING_THRESHOLD_REACHED: TXWait has reached the falling threshold (port=fc1/54 [0x1035000], value=0) .
    2019 Dec  2 16:24:08 mds9396t %PMON-SLOT1-3-RISING_THRESHOLD_REACHED: TXWait has reached the rising threshold (port=fc1/54 [0x1035000], value=96) .
</pre>

Conditions:
This issue only applies to MDS 9396T switches with constant transmit delay (constant receive R_RDY delay from peer). Other platforms are not affected.
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.