3.0 Network Configuration, continued
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3.2 Establishing IP Connectivity
The DM3X Transponder supports the CableLabs DOCSIS 3.0 IPv6 implementation. The main benefit of IPv6 is its
expanded addressing capability, increasing the address space from 32 to 128 bits, providing virtually unlimited number
of networks and systems. The DM3X Transponder determines the IP provisioning mode via the CableLabs SNMP MIB
parameter docsIf3CmMdCfgIpProvMode (SNMP OID: 1.3.6.1.4.1.4491.2.1.20.1.31.1.1). The DM3X will support the
following configurable IP Provisioning Mode Override policies:
• Honor MDD: The cable modem of the DM3X unit will acquire an IPv6 or IPv4 address as directed by the MAC
Domain Descriptor (MDD) message for provisioning and operation.
• IPv4 only: The cable modem of the DM3X unit will acquire a single IPv4 address for the CM management stack,
overriding the TLVs in the MDD message.
• IPv6 only: The cable modem of the DM3X unit will acquire a single IPv6 address for the CM management stack,
overriding the TLVs in the MDD message.
3.3 The DOCSIS Configuration File
A cable modem’s DOCSIS Configuration File is a type-length-value (TLV) file that contains important operational
parameters as defined by the DOCSIS standards. It provides certain settings for the cable modem. In addition to standard
entries, settings in the DOCSIS Configuration File should include the modem’s community strings and if an upgrade is
necessary, firmware upgrade parameters. Place the Configuration File in the TFTP root directory.
The transponder’s cable modem interface can support both IPv4 and IPv6 addressing schemes. The required DOCSIS
Configuration File operational parameters will differ depending on company policies, cable modem firmware versions and
IP addressing schemes. The following DOCSIS Configuration File details listed in this manual are general guidelines.
Please consult the published DOCSIS Specification resources (CableLabs) for additional DOCSIS Configuration File
details and guidelines.
To build a DOCSIS Configuration File, use a DOCSIS TLV editor program.
See the example Configuration Files in Sections 3.3.5 and 3.3.6.
The modem community strings should be set in the DOCSIS Configuration File. Failure to set community strings
will result in a less secure system. For automatically updating modem firmware with the DOCSIS Configuration File,
see
Section 5.1, Upgrading DM3X Modem Firmware
.
NOTICE
: