Symptom
STP Dual root - Edge switch and N7ks in VPC+ both claim to be STP root
STP disputes
%STP-2-DISPUTE_DETECTED: Dispute detected on port VSI-port-channel4.4095 on BD2498.
VPC+ implicit peer-switch feature not working. VPC secondary switch's BPDU not leaving VSI ports
Conditions
So far observed with DFA/VPC+ setup with N7ks running 8.2x release
VSI/service instance ports towards Edge switch with N7ks configured with bridge domain
Workaround
configure vpc peer-switch
Further Problem Description
issue is currently under investigation
