Restore jumbo frame configuration which was broken in r218423.
Restore jumbo frame configuration which was broken in r218423.

Submitted by:	Andrey Zonov <andrey <> zonov dot org > (initial version)
Tested by:	Andrey Zonov <andrey <> zonov dot org >
MFC after:	1 week

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase