anchor.diff:  [source,python]
   ----
   interface TenGigabitEthernet0/0/0
  - mac-address 0100.0001.0000                     <1>
  + mac-address 0000.0001.0000                     <1>
    mtu 4000                                       <2>
    ip address 11.11.11.11 255.255.255.0           <3>
    ip policy route-map p1_to_p2                   <4>
  
positive.code: * to send only from TRex port 1 do this:
  ...........................................
  $./t-rex-64 -f cap2/dns.yaml -m 1  -d 100  -l 1000 --lo --lm 2
  ...........................................
  
  
  
negative.code: ----
   - port_limit      : 2    
      port_info       :  # set eh mac addr 
      - dest_mac        :   [0x0,0x0,0x0,0x1,0x0,0x00] <1>
        src_mac         :   [0x0,0x0,0x0,0x2,0x0,0x00] <2>
      - dest_mac        :   [0x0,0x0,0x0,0x3,0x0,0x00] <3>
        src_mac         :   [0x0,0x0,0x0,0x4,0x0,0x00] <4>
  ----
  <1>  Correspond to TRex port 0 - should be Router TenG 0/0/0 mac-address
  <2>  Should be distinc mac-addrees, router should be configure to sent to this mac-addrees
  