I hit got problem at labs yesterday due VPC implementation for VXLAN anycast gateway dont want to get failover.

solved by this workarround :

“vpc nve peer-link-vlan xx”

 

this is from Cisco sites :

vPC Considerations

    A virtual IP must be configured for the vPC pair
    A virtual IP must be configured for loopback purposes.
    A peer-link switched virtual interfaces (SVI) must be only on a peer-link in external communication. A configuration example:
    vpc nve peer-link-vlan 99
    interface vlan99
    no shutdown
    no ip redirects
    ip address 99.1.1.1/24
    ip ospf cost 10
    ip router ospf 1 area 0.0.0.0
    ip pim sparse-mode
    A special peer-link SVI must be configured on the VPC pair.
    VPC peers must have identical configurations:
        Consistent VLAN to VN-segment mapping.
        Consistent NVE1 binding to the same loopback interface.
            Using the same secondary IP address.
            Using different primary IP addresses.

Reff: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5600/sw/layer2/7x/b_5600_Layer2_Config_7x/b_5600_Layer2_Config_7x_chapter_010010.html