In the bgp configuration:

 address-family ipv4
 no synchronization
 table-map asn-qos

route-map asn-qos, permit, sequence 10
  Match clauses:
    as-path (as-path filter): 499
  Set clauses:
    ip precedence flash
  Policy routing matches: 0 packets, 0 bytes

  Policy Map qos-asn
    Class saix-qos
     police cir 10000000 bc 312500 pir 12000000 be 312500
       conform-action transmit
       exceed-action drop
       violate-action drop
    Class class-default

 Class Map match-all saix-qos (id 4)
   Match   precedence 3

interface Vlan137
 ip address xxx.xxx.xxx.xxx 255.255.255.0
 service-policy output qos-asn
 bgp-policy destination ip-prec-map
end