The value of tmnxFPHiBwMcastGroup specifies the group of high
bandwidth multicast traffic taps to which this tap belongs.
A value of '0' specifies that this tap is not a member of any High
Bandwidth Multicast group.
tmnxMDAHiBwMcastGroup must be set in the same SNMP request PDU with
tmnxMDAHiBwMcastSource or an 'inconsistentValue' error will be
returned.