This document describes how to configure the DOCSIS3.1 Downstream Resiliency for OFDM channel on the Cisco cBR Series Converged Broadband Router.
Finding Feature Information
Your software release may not support all the features that are documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. The Feature Information Table at the end of this document provides information about the documented features and lists the releases in which each feature is supported.
Hardware Compatibility Matrix for the Cisco cBR Series Routers
![Cisco cBR Converged Broadband Routers Layer 2 and DOCSIS 3.1 Configuration Guide for Cisco IOS XE Amsterdam 17.2.x - DOCSIS3.1 Downstream Resiliency for OFDM channel [Support] (1)](https://i0.wp.com/www.cisco.com/content/dam/en/us/td/i/templates/note.gif "Cisco cBR Converged Broadband Routers Layer 2 and DOCSIS 3.1 Configuration Guide for Cisco IOS XE Amsterdam 17.2.x - DOCSIS3.1 Downstream Resiliency for OFDM channel [Support] (1)") Note | |
| 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:
| Cisco IOS-XE Release 16.5.1 and Later Releases Cisco cBR-8 CCAP Line Cards:
Digital PICs:
Cisco cBR-8 Downstream PHY Module:
Cisco cBR-8 Upstream PHY Modules:
|
Information about DOCSIS3.1 Downstream Resiliency for OFDM Channel
When DOCSIS3.1 CM reports non-primary RF channel failure for SCQAM or OFDM channel, actions performed by downstream resiliency is the same as DOCSIS3.0 CM. In other words, if RF channel impairment is below the resiliency threshold, CMs service flows are moved to Resiliency Bonding Group (RBG) or Narrow Band (NB) interface. If RF channel impairment is above the resiliency threshold, the impaired RF channel is temporarily removed from the bonding group.
The following table summarizes the CM-STATUS events for OFDM channel, and the action to be taken by the downstream resiliency module:
| Event Type Code | Event Description | DS Resiliency Action |
|---|---|---|
| 1 | MDD timeout | Move CM’s service flows to RBG/NB or suspend RF from BG. |
| 2 | FEC lock failure | Move CM’s service flows to RBG/NB or suspend RF from BG. |
| 4 | MDD recovery | Move CM’s service flows back to original BG. |
| 5 | FEC lock recovery | Move CM’s service flows back to original BG. |
| 16 | DS OFDM profile failure. A loss of FEC lock on one of the assigned downstream OFDM profiles of a channel. | DS OFDM Profile Manager will handle this event and take action. |
| 20 | NCP profile failure. Loss of FEC lock on NCP. | Move CM's service flows to RBG/NB or suspend RF from BG. |
| 21 | Loss of FEC lock on the PLC. | Move CM's service flows to RBG/NB or suspend RF from BG. |
| 22 | NCP profile recovery. | Move CM's service flows back to original BG. |
| 23 | FEC recovery on PLC channel. | Move CM's service flows back to original BG. |
| 24 | FEC recovery on OFDM profile. | Recovery of impairment reported by event 16. DS OFDM Profile Manager will handle this event and take action. |
How to Configure DOCSIS3.1 Downstream Resiliency for OFDM Channel
Configuring DOCSIS3.1 Downstream Resiliency for OFDM Channel
User must configure the command cable rf-change-trigger percent value count number to enable the downstream resiliency functionality.
To configure the trigger thresholds specific to OFDM RF impairment, follow the steps below:
enable configure terminal cable ofdm-rf-change-trigger percent value counter number [no-ncp-plc] Starting from Cisco IOS XE Fuji 16.10.1d release, you can exclude NCP and PLC reports separately by following these steps:
enable configure terminal cable ofdm-rf-change-trigger percent value counter number [no-ncp] [no-plc] Trigger thresholds value and number apply globally to the non-primary OFDM RF channels. If this command is not configured, the trigger thresholds configured by the command cable rf-change-trigger percent value count number will be used for the non-primary OFDM channels.
With no-ncp-plc configured in the command, this feature will not take any action when CM reports CM-STATUS-EVENT 20 or 21.
Note | The cable rf-change-trigger percent value count number command is optional and the configured trigger thresholds apply to non-primary OFDM channels only. |
Displaying OFDM Specific CM-STATUS Events
To display the statistics of the OFDM specific CM-STATUS events, use the show cable modem wideband rcs-status command as shown in the example below:
router#show cable modem 4800.33ea.7072 wideband rcs-status verbose CM : 4800.33ea.7072RF : 3/0/0 0 Status : UP FEC/QAM Failure : 0 Dup FEC/QAM Failure : 0 FEC/QAM Recovery : 0 Dup FEC/QAM Recovery : 0 MDD Failure : 0 Dup MDD Failure : 0 MDD Recovery : 0 Dup MDD Recovery : 0 Flaps : 0 Flap Duration : 00:00RF : 3/0/0 1 Status : UP FEC/QAM Failure : 0 Dup FEC/QAM Failure : 0 FEC/QAM Recovery : 0 Dup FEC/QAM Recovery : 0 MDD Failure : 0 Dup MDD Failure : 0 MDD Recovery : 0 Dup MDD Recovery : 0 Flaps : 0 Flap Duration : 00:00RF : 3/0/0 159 Status : UP FEC/QAM Failure : 0 Dup FEC/QAM Failure : 0 FEC/QAM Recovery : 0 Dup FEC/QAM Recovery : 0 MDD Failure : 0 Dup MDD Failure : 0 MDD Recovery : 0 Dup MDD Recovery : 0 NCP PROF Failure : 2 May 8 15:14:24 Dup NCP PROF Failure : 0 NCP PROF Recovery : 1 May 8 15:15:18 Dup NCP PROF Recovery : 0 PLC Lock Failure : 1 May 8 15:14:47 Dup PLC Lock Failure : 0 PLC Lock Recovery : 1 May 8 15:15:46 Dup PLC Lock Recovery : 0 Flaps : 0 Flap Duration : 00:00 OFDM Profile Id : 2 Status : UP Profile Failure : 1 May 8 15:16:18 DUP Profile Failure : 0 Profile Recovery : 1 May 8 15:16:44 DUP Profile Recovery : 0 Feature Information for DOCSIS3.1 Downstream Resiliency for OFDM Channel
Use CiscoFeature Navigator to find information about the platform support and software image support. CiscoFeature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access CiscoFeature Navigator, go to the https://cfnng.cisco.com/ link. An account on the Cisco.com page is not required.
Note | The following table lists the software release in which a given feature is introduced. Unless noted otherwise, subsequent releases of that software release train also support that feature. |
| Feature Name | Releases | Feature Information |
|---|---|---|
| DOCSIS3.1 Downstream Resiliency for OFDM Channel | Cisco IOS XE Everest 16.7.1 | This feature was integrated on the Cisco cBR Series Converged Broadband Routers. |
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