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Cisco uBR10012 Universal Broadband Router Software Configuration Guide
OL-1520-08
Chapter1 Overview of CiscouBR10012 Universal Broadband Router Software Supported Software Features for the CiscouBR10012 Router
ranging slots at roughly the same time. Without theCiscouBR10012router algorithms enabled, CMs can
repeatedly collide and back off a random number of initial ranging slots independently before trying
again.
With CiscouBR10012router algorithms enabled, the CMTS can detect such high-contention scenarios,
and can increase the frequency of initial ranging slots to assist in quick resolution of ranging contention.
After the high collision state is over—few persistent ranging collisions occur on the upstream—the
CMTS detects this condition and switches back to the steady state mode. In the steady state mode, the
frequency of initial ranging slots is a function of the upstream channel utilization. If extra upstream
bandwidth is available, the CMTS allocates more initial upstream ranging slots. As soon as the MAC
scheduler needs the upstream bandwidth for data grants, the MAC scheduler reduces the frequency of
initial ranging slots.
For additional information about dynamic ranging on multiple components, refer to the Cisco Web site
at http://www.cisco.com.
Flap List Support
The cable flap list troubleshooting feature tracks “flapping” CMs—CMs that have intermittent
connectivity problems. Such connectivity problems might originate in the upstream or downstream
portion of the cable plant, or originate in the CM itself. For additional information, refer to flap list
information contained in the Cisco Cable Modem Termination System Feature Guide.
Online Offline Diagnostics (OOD) Support for the Cisco uBR10012 Universal Broadband Router
Cisco IOS Release 12.3(13a)BC introduces support for Online Offline Diagnostics (OOD) in the field
for the Cisco uBR1002 router, including support in a high availability environment with HCCP N+1
Redundancy. The Online Offline Diagnostics(OOD) feature introduces a Field Diagnostic tool that
provides a method of testing and verifying line card hardware problems.
This feature is supported on the following field replaceable units (FRUs) of the Cisco uBR10012 router:
•Cisco uBR10012 PRE1 and PRE2 Performance Routing Engine (PRE1 and PRE2) modules
•Cisco uBR10K-MC520S/U broadband processing engine (BPE)
•Cisco uBR10012 OC-48 DPT/POS WAN interface module
To view a list of hardware on the Cisco uBR10012 router that is supported by Field Diagnostics, refer
to the following document:
•Online Offline Diagnostics—User’s Guide for Cisco uBR10012 Router Field Diagnostics
http://www.cisco.com/univercd/cc/td/doc/product/cable/ubr10k/ubr10kts/index.htm
If you would like to perform a hardware diagnostic test on a line card in your Cisco uBR10000 series
router, an OOD Field Diagnostic image can be downloaded free of charge from Cisco Systems and used
to test whether the line card problems are indeed due to faulty hardware. The test results verify whether
or not the hardware is faulty.