The Send Update Information flags. This value matches
the 16 bit field sent in OReq and RI-Req packets. The
bits are broken down as follows:
0x4000 = Net Add
0x2000 = Net Delete/Net Route Change
0x1000 = Net Distance Change
0x0800 = Zone Change
These should be 'OR'ed together for desired updates.
e.g. for all updates 0x4000 | 0x2000 | 0x1000 | 0x8000 =
0x7800 = 30720