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

Last Modified

Jun 16, 2018

Products (154)

  • Cisco Catalyst 9500 Series Switches
  • Cisco Catalyst 3850-48XS-F-S Switch
  • Cisco Catalyst 3650-12X48UR-L Switch
  • Cisco Catalyst 3850-48P-E Switch
  • Cisco Catalyst 3850-24P-L Switch
  • Cisco Catalyst 3650-24PDM-E Switch
  • Cisco Catalyst 3850-12S-E Switch
  • Cisco Catalyst 3650-48FQ-E Switch
  • Cisco ASR 920-10SZ-PD Router
  • Cisco Catalyst 3650-8X24UQ-E Switch
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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.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
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