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Cisco Bug: CSCvi91730 - cts manual MACsec between cat9k and cat4k cause interface flaps

Last Modified

May 10, 2019

Products (151)

  • Cisco Catalyst 9500 Series Switches
  • Cisco ASR 920-24TZ-M Router
  • Cisco Catalyst 3650-48FQ-E Switch
  • Cisco Catalyst 9410R Switch
  • Cisco Catalyst 3850-48P-E Switch
  • Cisco Catalyst 3650-24TD-S Switch
  • Cisco Catalyst 9300-48U-A Switch
  • Cisco Catalyst 3650-48TQ-L Switch
  • Cisco Catalyst 3850-48XS-F-S Switch
  • Cisco NCS 4202
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Known Affected Releases


Description (partial)

The interface on cat 9k when connected to a cat 4k will start to flap every few minutes when cts manual is enabled.
When connecting 2 9ks together or two 4ks together, the link is stable.
Flap happens every 3-4 minutes with log 
*Apr 10 18:54:19.118: %UTIL-6-RANDOM: A pseudo-random number was generated twice in succession
on the 9k.

cts manual macsec between 9k and 4k switch.

Related Community Discussions

16.6.4 Beta Release for Catalyst Switches
16.6.4 Beta Release for Catalyst Switches   Enterprise Switching Business Unit is happy to announce availability of Beta release of 16.6.4. This will be the second beta rebuild on 16.6.4, targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms.  We are looking for early feedback from customers before 16.6.4 software release is posted on CCO for General Availability (GA). This beta software addresses critical customer found defects are mentioned below.   Obtaining Pre-Release Software ...
Latest activity: Jun 25, 2018
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Bug Details Include

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