Cisco Headend System Release 2.7 Design Guide
Chapter 2 Guidelines for Configuring the DBDS for Multicast and Advanced DSG Mode
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Non-Hub Straddling
Non-hub straddling includes the configuration of the CMTS when the CMTS'
downstream message traffic is entirely contained within a single hub. When the
CMTS message traffic is isolated in this manner, the resulting message traffic is
defined as "non-hub straddling" (from a client set-top perspective). When the set-top
tunes to receive downstream message traffic, it receives messages that were
generated only for the given hub in which the set-top resides. The scenarios in
Example: Non-Hub Straddling (on page 11) address a CMTS in which message traffic
is categorized as non-hub straddling.
downstream message traffic is entirely contained within a single hub. When the
CMTS message traffic is isolated in this manner, the resulting message traffic is
defined as "non-hub straddling" (from a client set-top perspective). When the set-top
tunes to receive downstream message traffic, it receives messages that were
generated only for the given hub in which the set-top resides. The scenarios in
Example: Non-Hub Straddling (on page 11) address a CMTS in which message traffic
is categorized as non-hub straddling.
Notes:
In the following examples, the first usable IP address is configured as the
gateway IP address.
gateway IP address.
It is strongly recommended that the service provider prevent DBDS multicast
traffic from flowing to the home network by applying MIB filters to stand-alone
cable modems. These filters are defined in the DOCSIS Cable Device MIB Cable
Device Management Information Base for DOCSIS compliant Cable Modems and Cable
Modem Termination Systems, RFC 2669, August 1999.
traffic from flowing to the home network by applying MIB filters to stand-alone
cable modems. These filters are defined in the DOCSIS Cable Device MIB Cable
Device Management Information Base for DOCSIS compliant Cable Modems and Cable
Modem Termination Systems, RFC 2669, August 1999.
The following scenarios are only examples. To acquire a more up-to-date sample,
refer to your current CMTS configuration.
refer to your current CMTS configuration.
The line numbers to the left of the example CMTS configuration scenarios are for
illustrative and explanatory purposes only. They are not indicative of actual
CMTS device listings.
illustrative and explanatory purposes only. They are not indicative of actual
CMTS device listings.