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Cisco Bug: CSCul00298 - N7K VPC - Spanning tree alternate port put in forwarding state

Last Modified

Jan 31, 2017

Products (5)

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

Known Affected Releases


Description (partial)

Under rarer circumstances when switch configured for vPC recover from dual active , some L2 interface with STP port state as alternative will start forwarding the traffic.  
Switch should be configured for vPC and should recover from "dual Active " situation.
Also vPC keep alive and vPC peer link from both end should be configured on same Line card.  With above condition some set up may see the above symtom.
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