Hello!
According to https://www.cisco.com/c/dam/en/us/td/docs/switches/datacenter/sw/design/vpc_design/vpc_best_practices_design_guide.pdf
General Recommendation:
● Activate vPC peer-switch in a vPC environment
vPC peer-switch can be used in a vPC domain with different type of access device attachment (This is also called
hybrid-topology): access device can be vPC-attached to vPC domain and they can be STP-attached as well.
Single-attached access device are naturally supported in a vPC domain configured with peer-switch. ....... PC peer-switch supports a hybrid topology. Hybrid topology means both vPC-attached access device and
STPattached access device co-exist in the vPC domain.
From which I understand that there are no restrictions in using vPC peer-switch.
However from https://www.cisco.com/c/en/us/td/docs/dcn/nx-os/nexus9000/105x/configuration/interfaces/cisco-nexus-9000-series-nx-os-interfaces-configuration-guide-release-105x/m_configuring_vpcs_9x.html#concept_9AFFD3243455454B9228A6E9C4A77108
vPC Peer Switch
The vPC peer switch feature was added to Cisco NX-OS to address performance concerns around STP convergence.....This feature can be used with the pure peer switch topology in which the devices all belong to the vPC. Peer-switch feature is supported on networks that use vPC and STP-based redundancy is not supported. If the vPC Peer-Link fail in a hybrid peer-switch configuration, you can lose traffic. In this scenario, the vPC peers use the same STP root ID as well as the same bridge ID. The access switch traffic is split in two with half going to the first vPC peer and the other half to the second vPC peer. With vPC Peer-Link failure, there is no impact to the north/south traffic but the east/west traffic is lost.
See the example of a hybrid network below, dashed rectangle indicate vPC domains. Questions:
1) Will the last access block on the right work fine when enabling RSTP/MSTP?
2) Have someone tested the scenario?
3) What is the meaning of the bolded statements above?
