Refer to the exhibit. A Cisco data center environment is implemented with vPC. The web server replies using the SVI MAC address as the Layer 2 header instead of the HSRP MAC address on VLAN 23. This behavior causes packet drops on the Cisco Nexus 9000 Series Switches due to the vPC loop prevention mechanism The requirement is for the vPC feature to allow N9K_1 and N9K_2 to forward traffic between the NAS server and the web server, even if the HSRP's MAC address is not used on Layer 2 headers for VLAN 23. Which feature must be used to accomplish this goal?