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Cisco Bug: CSCuo80937 - Nexus 7000 Stuck Sending TCNs Every 2 Seconds

Last Modified

Apr 24, 2020

Products (8)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch

Known Affected Releases

6.2(10)E1 6.2(6)

Description (partial)

If there is any TC after upgrade to 6.2.(6), 6.2.(6a) or 6.2.(8), then after approximately 90 days of active supervisor uptime, STP TC BPDUs are sent out every 2 seconds for a long period of time.

Nexus 7000 or 7700 running 6.2(6), 6.2.(6a), or 6.2(8).

Related Community Discussions

Nexus 7K vPC + spanning-tree topology changes
Hi everyone, hoping to get some help regarding an issue that for me is very strange. I can't seem to wrap my head around it... Ill start describe the enviroment. We currently run two Nexus 7706 as a collapsed core/dist where we connect access switches for Datacenter and Client-network through vPC. Everything works great, no issue reported from customers or other departments and no errors found in either vPC configuration or spanning-tree design, all best practice from Cisco.  So, what is the problem? ...
Latest activity: Nov 19, 2014
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