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Cisco Bug: CSCvs68751 - CBL blocked state on BCM after interface comes up on FEX

Last Modified

May 28, 2020

Products (52)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 3064 Switch
  • Cisco Nexus 9396TX Switch
  • Cisco Nexus 31108TC-V Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 92160YC-X Switch
  • Cisco Nexus 3132Q-V Switch
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Known Affected Releases


Description (partial)

After bringing up FEX interface by inserting a cable, some switch interfaces can end up in a Blocking state from BCM perspective.
STP is forwarding from the software perspective.

-STP, PIXM , VLANMGR or SATMGR show no events that trigger reprogramming on BCM.
-STP shows forwarding in Software.

MST mode
Fex interface has no configuration applied
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Bug Details Include

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  • Status
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