At present, port mirroring can be accessed from the OVN level. But having the support from the Neutron perspective will make it an end-to-end feature. The plan is to incorporate this end-to-end integration with a new driver in the tap-as-a-service project.

Additionally, investigate the following enhancements and supportability in upstream and downstream. 

• OVS performance impact when OVS mirror is enabled. OVS performance should be considered as it impacts customer traffic and OVS mirror should be used temporarily.
• Max egress traffic limit. The mirror traffic plus egress traffic can exceed the NIC port bandwidth (specially for OVS-DPDK), so it should have a mechanism to control and limit the number of mirrors so it does not exceed the max bandwidth limit. 
• OVS mirror has to be removed as soon as the mirror traffic endpoint is down, otherwise the flooded mirrored traffic will be overwhelming the transport fabric and impacting the system.