On controller to push the policy to PE/client:
class-map type traffic match-all FLOWSPEC
match destination-address ipv6 2001:db8::/32 <<<<< Match destination address/subnet.
policy-map type pbr FS_P
class type traffic FLOWSPEC <<<<< Apply class-map under policy-map.
service-policy type pbr FSP_V4
service-policy type pbr FS_P <<<<< Apply policy-map inside Flowspec under AF.
On PE/client is to enable IPv6 flowspec AF under BGP.
address-family ipv6 flowspec <<<<< Under ipv6 flowspec AF, activate the neighbor.
neighbor 10.192.202.5 activate
neighbor 10.192.202.5 validation off
To apply the flowspec policy on interface, "local-install interface-all" command is must under flowspec.
local-install interface-all <<<<< Push the policy on interface.