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Cisco Bug: CSCun69004 - Nexus 5K/6k sends untagged BPDUs on vPC when leg on vPC Primary is down

Last Modified

Jun 04, 2019

Products (1)

  • Cisco Nexus 6000 Series Switches

Known Affected Releases

7.0(0)N1(1.1)

Description (partial)

Symptom:
switch connected via a vPC will see the following STP state:

Switch# show spanning-tree interface port-channel 17

Vlan             Role Sts Cost      Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
VLAN0001         Desg BKN*1         128.4112 P2p *PVID_Inc

VLAN0200         Desg BKN*1         128.4112 P2p *PVID_Inc

VLAN0500         Desg BKN*1         128.4112 P2p *PVID_Inc

Conditions:
Two Nexus switches running 7.0(0)N1(1)

vPC leg on vPC Primary is down
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