Cisco cBR Converged Broadband Routers DOCSIS Software Configuration Guide for Cisco IOS XE Everest 16.5.1

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/. An account on http://www.cisco.com/ is not required.

Hardware Compatibility Matrix for Cisco cBR Series Routers

Note

The hardware components introduced in a given Cisco IOS-XE Release are supported in all subsequent releases unless otherwise specified.

Table 1 Hardware Compatibility Matrix for the Cisco cBR Series Routers
Cisco CMTS Platform	Processor Engine	Interface Cards
Cisco cBR-8 Converged Broadband Router	Cisco IOS-XE Release 16.5.1 and Later Releases Cisco cBR-8 Supervisor: PID—CBR-CCAP-SUP-160G PID—CBR-CCAP-SUP-60G PID—CBR-SUP-8X10G-PIC	Cisco IOS-XE Release 16.5.1 and Later Releases Cisco cBR-8 CCAP Line Cards: PID—CBR-LC-8D30-16U30 PID—CBR-LC-8D31-16U30 PID—CBR-RF-PIC PID—CBR-RF-PROT-PIC PID—CBR-CCAP-LC-40G-R Cisco cBR-8 Downstream PHY Modules: PID—CBR-D30-DS-MOD PID—CBR-D31-DS-MOD Cisco cBR-8 Upstream PHY Modules: PID—CBR-D30-US-MOD

Restrictions for Upstream Scheduler Mode

To ensure proper operation, Interface-based Admission Control must be enabled. When the 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. Interface-based admission control 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 Interface-based admission control is not enabled, the default (DOCSIS)scheduling mode blocks traffic after a certain number of calls.
UGS with Activity Detection (UGS-AD) is not supported by the LLQ scheduler mode but remains supported by the default DOCSIS scheduler mode.

Information About Upstream Scheduler Mode for the Cisco CMTS Routers

With UGS, a service flow is created that enables a cable modem to transmit fixed-size bursts of data at a guaranteed rate and with a guaranteed level of jitter by providing periodic transmission opportunities to the cable modem for fixed-sized frames. This kind of service flow is particularly suitable for VoIP applications.

With rtPS, a service flow is created that provides a periodic opportunity for a cable modem to request permission to transmit data by polling a single cable modem for a bandwidth request, rather than all the cable modems. This satisfies applications that have a requirement for real-time data transmission, and enables the cable modem to transmit data bursts of varying length. This kind of service flow is particularly suitable for MPEG VoIP.

The rtPS requests, by default, are internally treated as priority 7—the highest priority for all Best Effort traffic. This high priority reduces the latency of rtPS traffic under congestion.

With nrtPS, a service flow is created that provides a periodic opportunity for a cable modem to request permission to transmit data by polling a single cable modem for a bandwidth request, rather than all the cable modems. The data bursts may be of varying length. This kind of service flow is particularly suitable for non-interactive services such as file transfers.

How to Configure Upstream Scheduler Modes

Procedure

Command or Action

Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

Enter your password if prompted.

Step 2

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

Use one the following commands:

interface cable slot/subslot/port
interface cable slot/port

Example:

Router(config)# interface cable 7/0/1

Enters interface configuration mode for the specified cable interface.

Step 4

cable upstream n scheduling type ugs mode [llq |docsis]

Example:

Router(config-if)# cable upstream 4 scheduling type ugs mode llq

Enables LLQ-type (packet-based) scheduling for UGS services.

Note

Any combination of ugs, rtps, nrtps, llq, and docsis is allowed. The only default value is docsis .

Step 5

cable upstream n scheduling type rtps mode [llq |docsis]

Example:

Router(config-if)# cable upstream 4 scheduling type rtps mode docsis

Enables standard DOCSIS (TDM-based) scheduling for rtPS services.

Note

Any combination of ugs, rtps, nrtps, llq, and docsis is allowed. The only default value is docsis .

Step 6

end

Example:

Router(config-if)# end

Exits interface configuration mode and returns to privileged EXEC mode.

What to Do Next

To confirm whether the scheduler is operating in DOCSIS mode, use the show interface cable mac-scheduler command.

Router# show interface cable 7/0/1 mac-scheduler 0
     DOCSIS 1.1 MAC scheduler for Cable7/0/1/U0 : rate 30720000
     wfq:None 
     us_balance:OFF 
     fairness:OFF 
     Queue[Rng Polls] flows 0
     Queue[CIR Grants] flows 0
     Queue[BE(07) Grants] flows 0
     Queue[BE(06) Grants] flows 0
     Queue[BE(05) Grants] flows 0
     Queue[BE(04) Grants] flows 0
     Queue[BE(03) Grants] flows 0
     Queue[BE(02) Grants] flows 0
     Queue[BE(01) Grants] flows 0
     Queue[BE(00) Grants] flows 0
     Req Slots 2601578997, Req/Data Slots 4484512
     Init Mtn Slots 38265829, Stn Mtn Slots 78753
     Short Grant Slots 0, Long Grant Slots 0
     Adv Phy Short Grant Slots 412, Adv Phy Long Grant Slots 5519087
     Adv Phy UGS Grant Slots 0
     Avg upstream channel utilization : 1%
     Avg percent contention slots : 98%
     Avg percent initial ranging slots : 1%
     Avg percent minislots lost on late MAPs : 0%

     MAP TSS: lch_state 9, init_retries 0
              late_initial_maps 0, late_ucd_maps 0
              mac-phy tss errors 0, missed ccc 0

Additional References

The following sections provide references related to the Cisco CMTS routers.

Related Topic	Document Title
Cisco CMTS command reference	Cisco CMTS Cable Command Reference http://www.cisco.com/c/en/us/td/docs/cable/cmts/cmd_ref/b_cmts_cable_cmd_ref.html

Standards

Standard	Title
DOCSIS	Data-Over-Cable Service Interface Specifications, DOCSIS 2.0, Radio Frequency Interface Specification, CM-SP-RFIv2.0-I08-050408

Technical Assistance

Description	Link
The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.	http://www.cisco.com/cisco/web/support/index.html

Feature Information for Upstream Scheduler Mode

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Note

The table below lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Table 2 Feature Information for Upstream Scheduler Mode
Feature Name	Releases	Feature Information
Upstream Scheduler Mode	Cisco IOS XE Everest 16.5.1	This feature was integrated into Cisco IOS XE Everest 16.5.1 on the Cisco cBR Series Converged Broadband Routers.

Book Title

Chapter Title

Results

Chapter: Upstream Scheduler Mode

Upstream Scheduler Mode

Finding Feature Information

Finding Feature Information

Hardware Compatibility Matrix for Cisco cBR Series Routers

Restrictions for Upstream Scheduler Mode

Information About Upstream Scheduler Mode for the Cisco CMTS Routers

How to Configure Upstream Scheduler Modes

Additional References

Related Documents

Standards

Technical Assistance

Feature Information for Upstream Scheduler Mode

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