Руководство По Проектированию для Cisco DNCS System Release 2.7 3.7 4.2
4000358 Rev B
Guidelines for Configuring the DBDS for DOCSIS
2-9
DNCS and Server Configurations
Introduction
This section provides guidelines for configuring the following DNCS and Server
components for a DBDS network using DOCSIS:
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DNCS
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Mandatory DOCSIS 1.0 Servers
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DHCP Server
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TFTP Server
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Optional Servers
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TOD Server
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DNS Server
DNCS
The DNCS currently transmits the DBDS broadcast data. DHCTs operating in
DOCSIS systems still need these flows; however, they may not be able to rely on
QPSK modulators to deliver the flows. DSG-compliant CMTS routing and ARP
settings have been devised to mimic the QPSK behavior. One DSG is defined for all
flows. Therefore, every CMTS out-of-band (OOB) bridge requires one DSG
definition. The cable service providers can select any IP address from that subnet
range, but we recommend that they choose it from the upper end or the lower end of
the range to avoid splitting scopes at the DHCP server.
The DNCS provides a user interface for defining a CMTS OOB bridge. When
The DNCS provides a user interface for defining a CMTS OOB bridge. When
defining a CMTS OOB bridge, the operator should provide the following
information:
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a name for the bridge
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a hub to associate with the bridge
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the name and IP address of the CMTS hosting the bridge
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a DSG IP address
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a DHCT communication mode
Routes pointing to the DHCT CPE subnets must be added in the DNCS and on any
other router(s) located between the DNCS and the CMTS.
The DNCS provides the operator with tools to select the DCM for individual out-of-
The DNCS provides the operator with tools to select the DCM for individual out-of-
band bridges, including QPSK modulators. Refer to Chapter 1 for a description of
the different modes.