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      1 header_type ethernet_t {
      2     fields {
      3         dstAddr : 48;
      4     }
      5 }
      6 
      7 header_type ipv4_t {
      8     fields {
      9         srcAddr : 32;
     10     }
     11 }
     12 
     13 parser start {
     14     return parse_ethernet;
     15 }
     16 
     17 header ethernet_t ethernet;
     18 
     19 parser parse_ethernet {
     20     extract(ethernet);
     21     return parse_ipv4;
     22 }
     23 
     24 action nop() 
     25 {}
     26 
     27 header ipv4_t ipv4;
     28 
     29 parser parse_ipv4 {
     30     extract(ipv4);
     31     return ingress;
     32 }
     33 
     34 table routing {
     35    reads {
     36       ethernet.dstAddr: exact;
     37       ipv4.srcAddr: exact;
     38    }
     39    actions { nop; }
     40    size : 512;
     41 }
     42 
     43 control ingress
     44 {
     45     apply(routing);
     46 }