-- binary
04 0b # version, type
00 48 # length
12 34 56 78 # xid
fe dc ba 98 76 54 32 10 # cookie
42 68 # priority
02 # reason
14 # table_id
00 00 00 0a # duration_sec
00 00 03 e8 # duration_nsec
00 05 # idle_timeout
00 1e # hard_timeout
00 00 00 00 00 00 00 01 # packet_count
00 00 00 00 00 00 00 02 # byte_count
00 01 # match.type
00 16 # match.length
80 00 2A 02 # match.oxm_list[0].type_len
00 01 # match.oxm_list[0].value
80 00 01 08 # match.oxm_list[1].type_len
00 00 00 04 # match.oxm_list[1].value
00 00 00 05 # match.oxm_list[1].mask
00 00 # match.pad
-- python
ofp.message.flow_removed(
    xid=0x12345678,
    cookie=0xFEDCBA9876543210,
    priority=17000,
    reason=ofp.OFPRR_DELETE,
    table_id=20,
    duration_sec=10,
    duration_nsec=1000,
    idle_timeout=5,
    hard_timeout=30,
    packet_count=1,
    byte_count=2,
    match=ofp.match(oxm_list=[
        ofp.oxm.arp_op(value=1),
        ofp.oxm.in_port_masked(value=4, value_mask=5)]))