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Cisco Bug: CSCuo69786 - non-vPC port is allowed in enhanced vPC topology using pre-provisioning

Last Modified

Aug 21, 2017

Products (6)

  • Cisco Nexus 5000 Series Switches
  • Cisco Nexus 5596UP Switch
  • Cisco Nexus 5548P Switch
  • Cisco Nexus 6004 Switch
  • Cisco Nexus 6001 Switch
  • Cisco Nexus 5548UP Switch

Known Affected Releases

6.0(2)N2(1) 6.0(2)N2(4)

Description (partial)

fex HIF port-channel is recognized as non-vPC port even in enhanced vPC topology, although such a port-channel should be usually recognized as vPC port without explicit vPC configuration.

The topology is composed of dual-homed server to fex's, and dual-homed fex's to N5K's.
The incident could occur when following steps below:
1) Before connecting FEX's, configure fex's and FEX HIF port-channel as vPC explicitly using pre-provisioning
2) Connect FEX's, then configure "no vpc <id>" on the FEX HIF port-channel
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