DOCSIS 3.1 Path Selection

This document describes how to configure the path selecion on the Cisco cBR Series Converged Broadband Router.

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 3.15.0S and Later Releases

Cisco cBR-8 Supervisor :

  • PID—CBR-CCAP-SUP-160G

  • PID—CBR-CCAP-SUP-60G1

  • PID—CBR-SUP-8X10G-PIC

Cisco IOS-XE Release 3.15.0S 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

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

1 Effective with Cisco IOS-XE Release 3.17.0S, CBR-CCAP-SUP-60G supports 8 cable line cards. The total traffic rate is limited to 60Gbps, the total number of downstream service flow is limited to 72268, and downstream unicast low-latency flow does not count against the limits.

Information about Path Selection

DOCSIS 3.1 Path Selection feature is enhanced to support OFDM downstream channels. The RCC decision process is enhanced to include OFDM channels.

How to Configure Path Selection

Configuring Downstream Bonding Group with OFDM Channel

To configure the downstream bonding group with OFDM channel, follow the steps below:

enable 
configure terminal 
interface wideband-cable slot/subslot/bay:wideband-channel 
description text 
cable bundle id 
cable rf-channels channel-list grouplist bandwidth-percent percentage-bandwidth 

Note

Channel 158 to 162 are specified as OFDM channel.


Verifying Downstream Bonding Group with OFDM Channel Configuration

To display the details of the downstream bonding group with OFDM channel, use the show running-config interface command as shown in the example below:

Router# show running-config interface wideband-cable 3/0/0:13 

Building configuration...

Current configuration : 212 bytes
!
interface Wideband-Cable3/0/0:13
 description D31-DSBG: 1 SC-QAM plus 1 OFDM
 cable bundle 1
 cable rf-channels channel-list 8 bandwidth-percent 30
 cable rf-channels channel-list 158 bandwidth-percent 25
end

Verifying the Path Selection Status

To display the path selection status of a cable modem, use the show cable modem path-sel command as shown in the example below:

router#show cable modem 38c8.5cfe.efa6 path-sel 

CM 38c8.5cfe.efa6 Path-Sel Info: 07:20

RCS Filter Result: Succeed
Candidate RCS List: 2
  RCC-Id   Owner-Id   Preliminary  RCP      TLV-56   LBG      SF-Attr   CM-Attr  
  1        1 :12289   Pass         Pass      --      Pass     Pass      Pass     
  2        1 :12290   Pass         Pass      --      Pass     Pass      Pass     

TCS Filter Result: Succeed
TCS Info:
  TCS in CGD            : 0x7         UCID: 1 2 3 
  TCS in Freq Range     : 0x7         UCID: 1 2 3 
  TCS Impaired          : 0x0       
TCS Passed filters:
  Preliminary           : 0x7         UCID: 1 2 3 
  LB Group              : 0x7         UCID: 1 2 3 
  SF Attr Mask          : 0x7         UCID: 1 2 3 
  CM Attr Mask          : 0x7         UCID: 1 2 3 

Candidate US-BG List: 4
  UBG-Id   Chan-Mask    Preliminary  TLV-56   LBG      SF-Attr   CM-Attr  
  1        0x7          Pass          --      Pass     Pass      Pass     
  65537    0x2          Pass          --      Pass     Pass      Pass     
  65538    0x4          Pass          --      Pass     Pass      Pass     
  65536    0x1          Pass          --      Pass     Pass      Pass     

Primary DS Chan Result: Skipped
Candidate Primary DS Chan List: 0

Primary US Chan Result: Skipped
Candidate Primary US Chan List: 0

Clearing the Path Selection Status

To clear the path selection status for all CMs, use the clear cable modem all path-sel command as shown in the example below:

Router# clear cable modem all path-sel

Router# show cable modem c8fb.26a6.c46a path-sel

CM c8fb.26a6.c46a Path-Sel Info: N/A
Path-Sel status has been cleared after register online.

Verifying the RCC Configuration

To verify the runtime RCCs on a cable interface, use the show cable mac-domain rcc command as shown in the example below:

Router# show cable mac-domain cable 7/0/0 rcc

RCC-ID   RCP                 RCs MD-DS-SG CMs   WB/RCC-TMPL      D3.0 D3.1
4        00 00 00 00 00      16  0        1     WB (Wi7/0/0:0)   Y    Y
5        00 00 00 00 00      25  0        2     WB (Wi7/0/0:1)   N    Y
6        00 10 00 00 08      8   0        0     RCC-TMPL(3:1)    Y    N
7        00 00 00 00 00      4   0        0     WB (Wi7/0/0:4)   Y    Y

To display the detailed information for only DOCSIS 3.1 capable RCC, use the show cable mac-domain rcc simplified command as shown in the example below:

router#show cable mac-domain cable 7/0/0 rcc 5 simplified 

RCC ID                  : 5
Created Via             : Wideband - Wi7/0/0:1
CM attribute mask       : 0x80000000

Primary Receive Channel List:
  Chan Idx   RF Chan         DCID  Freq            
  1          In7/0/0:0       1     453000000       

Non-Primary Receive Channel List: 
  Chan Idx   RF Chan         DCID  Freq            
  2          In7/0/0:1       2     459000000       
  3          In7/0/0:2       3     465000000       
  4          In7/0/0:3       4     471000000       
  5          In7/0/0:4       5     477000000       
  6          In7/0/0:5       6     483000000       
  7          In7/0/0:6       7     489000000       
  8          In7/0/0:7       8     495000000       
  9          In7/0/0:8       9     501000000       
  10         In7/0/0:9       10    507000000       
  11         In7/0/0:10      11    513000000       
  12         In7/0/0:11      12    519000000       
  13         In7/0/0:12      13    525000000       
  14         In7/0/0:13      14    531000000       
  15         In7/0/0:14      15    537000000       
  16         In7/0/0:15      16    543000000       
  17         In7/0/0:16      17    549000000       
  18         In7/0/0:17      18    555000000       
  19         In7/0/0:18      19    561000000       
  20         In7/0/0:19      20    567000000       
  21         In7/0/0:20      21    573000000       
  22         In7/0/0:21      22    579000000       
  23         In7/0/0:22      23    585000000       
  24         In7/0/0:23      24    591000000       
  25         In7/0/0:158     159   663000000        

OFDM Receive Channel List:
  Chan Idx   RF Chan         DCID  PLC-Freq        Profiles  
  25         In7/0/0:158     159   663000000       0 1 2 
  

Additional References

Related Document

Document Title

Link

Cisco cBR Converged Broadband Routers Layer 2 and DOCSIS 3.0 Configuration Guide

http://www.cisco.com/c/en/us/td/docs/cable/cbr/configuration/guide/b_cbr_layer2_docsis30.html

MIBs

MIBs

MIBs Link

  • DOCS-IF31-MIB

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

Technical Assistance

Description

Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/support

Feature Information for DOCSIS 3.1 Path Selection

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://tools.cisco.com/ITDIT/CFN/. An account on http://www.cisco.com/ is not required.


Note

The below table 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 DOCSIS 3.1 Path Selection

Feature Name

Releases

Feature Information

DOCSIS 3.1 Path Selection

Cisco IOS-XE Release 3.18.0SP

This feature was introduced on the Cisco cBR Series Converged Broadband Router s.