This is obsolete in V5.0 and upwards.
Defines how SMDS packets entering BNX network through
SMDS SSI and SMDS SNI interfaces should be treated at this
circuit during congestion for dropping. This is applicable
only on the internodal links.
CNGC_FRDE - treat this like Frame relay DE frame.
CNGC_FRNDE - treat this like Frame Relay non DE frame
CNGC_DATAGRAM - treat this like a datagram packet.