Description: This object reports the value configured in a per-CM L2VPN Encoding for Downstream Unencrypted Traffic (DUT) Cable Modem Interface Mask (CMIM).

The DUT CMIM is a bit string with a '1' for each bit position K for an internal or external CM interface with ifIndex K to which the CM permits DUT to be forwarded. A CM capable of DUT filtering MUST discard DUT to interfaces with a '0' in the DUT CMIM.

If a CM's top-level registration request L2VPN Encoding contained no DUT CMIM subtype, this object is reported with its default value of a '1' in bit position 0 (corresponding to the eCM's own 'self' host) and a '1' in each bit position K for which an eSAFE interface exists at ifIndex K. In other words, the default DUT CMIM includes the eCM and all eSAFE interfaces.

This value is reported independently of whether the CM is actually capable of performing DUT filtering.