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