High Availability Features - Cisco uBR10012 Software Configuration Manual

Chapter 1 Overview of Cisco uBR10012 Universal Broadband Router Software
Optional Upstream Scheduler Modes
With this feature, the user is able to select either Unsolicited Grant Services (UGS) or Real Time Polling
Service (rtPS) scheduling types, as well as packet-based or TDM-based scheduling. Low latency
queueing (LLQ) emulates a packet-mode-like operation over the Time Division Multiplex (TDM)
infrastructure of DOCSIS. As such, the feature provides the typical tradeoff between packets and TDM:
with LLQ, the user has more flexibility in defining service parameters for UGS or rtPS, but with no
guarantee (other than statistical distribution) regarding parameters such as delay and jitter.
Restrictions
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New and Changed Commands
cable upstream n scheduling type
Use this new command to turn the various scheduling modes on or off, where n specifies the upstream
port.
Router(config-if)# [no] cable upstream n scheduling type [ugs | rtps] mode [llq | docsis]
For additional information about scheduler enhancements on the Cisco CMTS, refer to the following:
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High Availability Features

Several powerful High Availability features are supported on the Cisco uBR10012 router:
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To ensure proper operation, Call Admission Control (CAC) must be enabled. When the Low Latency
Queueing (LLQ) option is enabled, it is possible for the upstream path to be filled with so many calls
that it becomes unusable, making voice quality unacceptable. CAC must be used to limit the number
of calls to ensure acceptable voice quality, as well as to ensure traffic other than voice traffic.
Even if CAC is not enabled, the default (DOCSIS) scheduling mode blocks traffic after a certain
number of calls.
Unsolicited Grant Services with Activity Detection (UGS-AD) and Non Real Time Polling Service
(nrtPS) are not supported.
Cisco CMTS Feature Guide — Configuring Upstream Scheduler Modes on the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_schd.html
DOCSIS 1.1 for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_docs.html
Automatic Revert Feature for HCCP N+1 Redundancy Switchover Events
Backup Path Testing for the Cisco RF Switch
DSX Messages and Synchronized PHS Information
Factory-Configured HCCP N+1 Redundancy
Globally Configured HCCP 4+1 and 7+1 Redundancy on the Cisco uBR10012 Router
HCCP N+1 Redundancy Supporting DOCSIS 1.1 for the Cisco CMTS
HCCP Timing and Error Enhancements in HCCP Redundancy Show Commands
High Availability Support for Encrypted IP Multicast
Shutdown and No Shutdown Enhancement for Cable Interfaces
Supported Software Features for the Cisco uBR10012 Router
Cisco uBR10012 Universal Broadband Router Software Configuration Guide
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