; Assuming propper VPC peering, this config must be on both.

fex 103
  pinning max-links 1
  description "FEX103"
  serial JAF1519BPFT
interface Ethernet1/9
  description PO103 - FEX103
  switchport mode fex-fabric
  fex associate 103
  spanning-tree port type edge trunk
  spanning-tree bpduguard enable
  channel-group 103
interface port-channel103
  switchport mode fex-fabric
  vpc 103
  fex associate 103

...

interface Ethernet103/1/1
  description dbapps3
  switchport access vlan 998
  ; FEX ports always an STP edge port and always have BPDUGuard on