This is an estimate of the Bandwidth of the network pipe
used for the B-D product computation, which lets us derive
the TCP receive window to advertise.
The cfmFcipEntityExtTcpMaxBW,cfmFcipEntityExtTcpMinAvailBW,
cfmFcipEntityExtTcpRndTrpTimeEst must be set in the same
SNMP set request. SET operation would fail if this object
is set individually.