-- binary
00 19 # type
00 10 # length
00 03 02 04 # OXM header
12 34 56 78 # OXM value
00 00 00 00 # pad
-- python
ofp.action.set_field(field=ofp.oxm.bsn_lag_id(0x12345678))
-- java
OFOxms oxms = OFFactories.getFactory(OFVersion.OF_13).oxms();
builder.setField(oxms.bsnLagId(LagId.of(0x12345678)))