You configure STP on a switch that is attached to a Cisco Fabric Path domain and that has the vPC feature deployed. How do you configure STP on the switch in the Cisco FabricPath domain on VL AN 10?
A. Option A
B. Option B
C. Option C
D. Option D
Answer is C
Pseudo-Information Command
The spanning-tree pseudo-information command was originally developed for Virtual PC (vPC) and vPC+ designs in order to allow users to create a hybrid vPC and non-vPC peer switch topology. In order to accomplish this, two different BPDU priorities are sent by the switch. Though this command was created in order to work in vPC environments, it fits well in the scenario that is described in the previous section.
When you globally enable this command, there are then two different STP priorities: a lower value (or, better priority) when the switch is connected to the FP (FP core ports up/ready), and a higher value (or, worst priority) that is used in the BPDUs that are sent by the switch after it reloads.
These CLI commands are used in order to configure the FP switch to send the two BPDU priorities:
switch(config)#spanning-tree vlan x priority 8192
switch(config)#spanning-tree pseudo-information
switch(config-pseudo)#vlan x root priority 4096
https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/118891-technote-stp-00.html