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Cisco Bug: CSCuj13933 - Secondary VPC+ switch incorrectly claims to be the STP root

Last Modified

Feb 16, 2017

Products (7)

  • Cisco Nexus 5000 Series Switches
  • Cisco Nexus 5548P Switch
  • Cisco Nexus 5596UP Switch
  • Cisco Nexus 5020 Switch
  • Cisco Nexus 5548UP Switch
  • Cisco Nexus 5010 Switch
  • Cisco Nexus 5596T Switch

Known Affected Releases

5.2(1)N1(5) 5.2(1)N1(7)

Description (partial)

VPC+ Secondary switch may incorrectly claim to be the STP root

This is observed on Nexus 5500 and Nexus 7000 where:
- VPC+ is used on Fabricpath edge
- MST is used
- None of the Fabricpath VLANs are mapped to MST instance 0 so the VPC+ switches are using their physical STP switch ID for MST0
- The real MST0 real root is either the VPC+ primary switch or behind a VPC+ port-channel
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