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Cisco uBR10012 Universal Broadband Router Software Configuration Guide
OL-1520-05
Chapter 1 Overview of Cisco uBR10012 Universal Broadband Router Software
Supported Software Features for the Cisco uBR10012 Router
DOCSIS 1.0 Multi SID Support
This feature allows the Cisco uBR10012 router to support the definition of multiple SIDs on the
upstream. This includes multiple service classes per cable interface, enabling administrators to delegate
higher priority as required.
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Higher-priority traffic can be designated on a higher QoS committed information rate (CIR)
secondary SID, while data traffic can be forwarded on a best-effort basis on a primary SID.
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Secondary SIDs can be defined to provide higher QoS CIR-type classes for higher-priority traffic. These
classes have a nonzero minimum reserved rate (CIR-type service). These SIDs, therefore, receive
preferential treatment at the CMTS for grants over any tiered best-effort type data SID for that upstream.
Note
Best-effort service involves requests with no minimum upstream rate on the channel. The CMTS
treats the primary and secondary SIDs independently for issuing grants. Each SID of a CM has an
independent state machine. Channel access for each SID is independent of the other SID.
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Cable-modem-initiated dynamic MAC messages—Dynamic Service Addition (DSA) and Dynamic
Service Deletion (DSD). These messages allow dynamic SIDs to be created and deleted at run time.
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Unsolicited grant service (CBR-scheduling) on the upstream helps provide a higher-quality channel
for upstream packets from the Cisco uBR924 cable access router, for example.
Caution
Reliable operation with higher-priority traffic requires multiple SIDs—at least two per
cable interface to separate highest-priority traffic from data traffic. In DOCSIS 1.0, SIDs are
set up statically. When supporting extensions to DOCSIS 1.0 or DOCSIS 1.1, SIDs can be set
up either statically or dynamically. Both the CMTS and CM must support the feature set.
DOCSIS 1.0 QoS Profile Enforcement
QoS profile enforcement allows you to override the provisioned service class of a cable interface at the time
of registration with a CMTS-defined QoS profile. When this feature is enabled, the CMTS provisions each
registering CM with a default DOCSIS 1.0 service class, which the CMTS administrator configures.
The administrator-defined service class is enforced on CMs attempting to register with the CMTS. The
service class has no upstream or downstream rate limits.
When the CM sends data upstream, it makes bandwidth requests without throttling or dropping packets
because of its own rate-policing algorithm. The CMTS does traffic shaping based on the QoS profile
enforced by the operator.
Note
By default, the system does not enforce a specific QoS profile on the cable interface. The QoS profile
assigned to the cable interface depends on the class of service parameters provisioned in the cable
interface DOCSIS configuration file.
DOCSIS 1.0 RFC 2233 Support (RF Interface MIB)
The Cisco uBR10012 router supports DOCSIS OSSI Required Objects in RFC 2233.
DOCSIS 1.0 Service Class Profiles
The Cisco uBR10012 router allows you to create multiple service class profiles with the following
characteristics:
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A specific QoS profile number
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Traffic priority (7, 6, 5, 4, 3, 2, 1, 0), with 7 being the highest
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Maximum and guaranteed upstream rate in bps
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Maximum upstream channel burst in minislot
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Minimum upstream rate in bps
