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Cisco Bug: CSCup21009 - N3K: Downstream port-channel in I state following reload

Last Modified

Feb 14, 2018

Products (7)

  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 3064 Switch
  • Cisco Nexus 3016 Switch
  • Cisco Nexus 3064-T Switch
  • Cisco Nexus 3048 Switch
  • Cisco Nexus 3132Q Switch
  • Cisco Nexus 3172 Switch

Known Affected Releases


Description (partial)

After a reload of a vPC device, the nexus switch may bring its physical links up and keep in a locally suspended state while vPC is negotiating.  During this time it does not send out LACP PDUs causing the downstream device to move its interface into a standalone (I) status potentially leading to traffic loss.

This has been observed on Nexus3000 and Nexus5000 running vPC.  Configuring 'delay restore' may exacerbate the issue as the downstream device keeps its link in an (I) state for a longer duration
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