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Cisco Bug: CSCuo67870 - VTP Pruning causes traffic outage in a vPC when primary leg is flapped

Last Modified

Jul 27, 2018

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(6) 6.2(8)

Description (partial)

vPC VLANs on a trunk interface are incorrectly pruned by VTP on the vPC Operational Secondary Nexus 7000. The interface can be configured as a vPC leg or as a vPC Orphan port.

This issue will only occur on a Nexus 7000 vPC setup running NX-OS version 6.2(6) or higher that is also configured to use VTP for VLAN pruning.

The trigger for the issue is a flap of a vPC leg on the vPC Operational Primary switch. After the link flap, VTP does not successfully process join messages for the VLANs, resulting in a timeout and the VLANs being pruned from the link.
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