Fairness Across Bonding Groups; Ofdm Channels; Interface Bandwidth; How To Configure Fairness Across Docsis Interfaces - Cisco cBR 8 Configuration Manual

Fairness Across Bonding Groups

Fairness Across Bonding Groups
Fairness Across DOCSIS Interfaces feature use the weight value of the aggregated active flow count, that is
EIR demand, to periodically re-balance the reservable bandwidth. So that the service flows with the same
weight in different bonding groups will have roughly the same throughput.

OFDM Channels

OFDM Channel
DOCSIS 3.1 introduces modes for higher throughput and higher spectral efficiency while still allowing
backward compatibility to DOCSIS 3.0. OFDM Channel support includes 1 OFDM channel per port with
channel bandwidth from 24 MHz to 192 MHz wide. In Cisco IOS-XE 16.5.1, a bonding group can consist of
SC-QAMs and OFDM channels. An OFDM channel can have multiple profiles configured, and each profile
may have different rate. The OFDM Channel rate can vary constantly depending on the profiles being used.
For more information on OFDM channels, see OFDM Channel Configuration Guide.
OFDM Channel Rate
An OFDM channel can have multiple profiles configured, and each profile can have different rates. For
example, with a 96MHz OFDM channel that is configured with profile A (Control Profile) with modulation
1024-QAM, profile B with modulation 2048-QAM, and profile C with modulation 4096-QAM, the profile
rates of profile A, B, and C are 616Mbps, 680Mbps, and 736Mbps respectively.
In Cisco IOS-XE 16.5.1, if an OFDM channel has both Control Profile (profile A) and Data Profiles (profile
B, C, and so on) configured, the lowest Data Profile rate is used for Fairness Across DOCSIS Interface
calculation. Otherwise, the Control Profile rate is used.

Interface Bandwidth

A Wideband-Cable (WB) interface can consist of both SC-QAMs and OFDM channels. If it contains OFDM
channels, the highest profile rates are used to calculate the interface bandwidth.
For example, with a 96MHz OFDM channel that is configured with profile A having modulation 1024-QAM,
profile B with modulation 2048-QAM, and profile C with modulation 4096-QAM, the profile rates of profile
A, B, and C are 616Mbps, 680Mbps, and 736Mbps respectively. Here, 736Mbps is used to calculate the
interface bandwidth.

How to Configure Fairness Across DOCSIS Interfaces

This section describes the following tasks that are required to implement Fairness Across DOCSIS Interfaces
feature:

Configuring Fairness Across DOCSIS Interfaces

This section describes how to enable Fairness Across DOCSIS Interfaces feature on the cable interfaces. The
configuration is applied to all WB or IC interfaces on the router.
Cisco cBR Series Converged Broadband Routers Quality of Services Configuration Guide for Cisco IOS XE
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Fairness Across DOCSIS Interfaces