tAtmTdpCLPTagging controls the setting of the CLP bit in the
ATM cell header for egress traffic on an IES or VPRN SAP.
If disabled (the default), all traffic has the CLP bit set
to zero. If enabled, traffic queued on expedited queues has
the CLP bit set to zero, while traffic on non-expedited queues
has the CLP bit set to one.