|An object of this type indicates a set of CM
MAC bridge interfaces, encoded as a BITS syntax with a ?1?
Bit for each interface included in the set.
Bit position eCM(0) represents a conceptual interface to
the internal 'self' host MAC of the eCM itself. All other
bit positions K correspond to CM MAC bridge port interface
index with ifIndex value K.
A BITS object is encoded as an OCTET STRING, which may have
length zero. Bit position 0 is encoded in the most
significant bit of the first octet, proceeding to
bit position 7 in the least significant bit. Bit position 8
is encoded in the most significant bit of the second octet,
and so on.
In a CM, ifIndex value 1 corresponds to the primary CPE
interface. In CableHome devices, this interface is assigned
to the embedded Portal Services (ePS) host interface, which
provides a portal to the primary physical CPE interface.
In many contexts of a DocsL2VpnIfList, a '1' in bit
position 1 corresponds to 'any' or 'all' CPE interfaces
when the CM contains more than one CPE interface.
ifIndex value 2 corresponds to the docsCableMacLayer
RF MAC interface.
ifIndex values 3 and 4 correspond to the
docsCableDownstream and docsCableUpstream interfaces,
respectively, which are not separate MAC bridge port
interfaces. Bit positions 3 and 4 are unused in this type;
they must be saved and reported as configured, but
ifIndex values 5 through 15 are reserved for individual
CPE interfaces for devices that implement more than one
CPE interface. In such devices, DocsL2vpnIfList bit
position 1 corresponds to the set of all CPE interfaces.
A CM with more than one CPE interface MAY assign a
DocsL2vpnIfList bit position within the range of 5..15 to
refer to the single primary CPE interface.
ifIndex value 16 is assigned to any embedded Multimedia
Terminal Adapter (eMTA) as defined by PacketCable.
ifIndex value 17 is assigned to the IP management host
interface of an embedded Set Top Box (eSTB). ifIndex value
18 is reserved for the DOCSIS Set-top Gateway (DSG) traffic
delivered to an eSTB.
ifIndex values 19 through 31 are
reserved for future defined embedded Service Application.
||eCm(0), cmci(1), docsCableMacLayer(2), docsCableDownstream(3), docsCableUpstream(4), eMta(16), eStbIp(17), eStbDsg(18)