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This document describes how to configure the upstream interfaces on the Cisco cBR Series Converged Broadband Router.
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.
 Note |
The hardware components that are introduced in a given Cisco IOS-XE Release are supported in all subsequent releases unless otherwise specified. |
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Cisco CMTS Platform |
Processor Engine |
Interface Cards |
|---|---|---|
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Cisco cBR-8 Converged Broadband Router |
Cisco IOS-XE Release 16.5.1 and Later Releases Cisco cBR-8 Supervisor:
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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:
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Note |
Do not use DPICs (8X10G and 2x100G) to forward IP traffic, as it may cause buffer exhaustion, leading to line card reload. The only allowed traffic on a DPICs DEPI, UEPI, and GCP traffic from the Cisco cBR-8 router to Remote PHY devices. Other traffic such as DHCP, SSH, and UTSC should flow via another router, since DPICs cannot be used for normal routing. |
The cable interface in the Cisco cBR router supports upstream signals and serves as the radio frequency (RF) interface. This chapter provides an overview of the upstream interfaces on the Cisco cBR Series Converged Broadband Router.
Cisco IOS XE Fuji 16.9.1 and later releases support 10 Gbps of upstream throughput on the following line cards on the Cisco cBR Series Converged Broadband Router:
CBR-CCAP-LC-40G
CBR-CCAP-LC-40G-R
Upstream Channel Management (UCM) is responsible for the physical (PHY) layer configuration and resource management of upstream channels in the Cisco cBR Series Converged Broadband Router.
An upstream port represents a physical upstream RF connector on a cable line card, connected to one or more fiber nodes. An upstream RF port is a container of upstream RF channels, which imposes constraints on both topology and spectrum for the group of RF channels contained in the physical port. An upstream RF port also represents the RF front-end hardware component on a cable line card including the connector, variable gain adjustment (VGA), and A/D converter. This is directly connected to a set of upstream physical channel receivers. The number of upstream physical channels per port is thus constrained by the number of receivers accessible to the port.
An upstream RF channel represents DOCSIS physical layer operation on a single upstream center frequency with a particular channel width. It is contained by a single physical port on the CMTS line card hardware.
The upstream resource management (URM) feature is primarily responsible for the maintenance of the relationship between a physical upstream connector on the line card and the upstream RF channels received on that connector.
This section contains the following:
Connect a console terminal to the console port on the I/O controller. When asked if you want to enter the initial dialog, answer no to go into the normal operating mode of the router. After a few seconds the user EXEC prompt (Router>) appears.
| Command or Action | Purpose | |
|---|---|---|
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Step 1 |
enable Example: |
Enables privileged EXEC mode. Enter your password if prompted. |
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Step 2 |
configure terminal Example: |
Enters global configuration mode. |
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Step 3 |
cable modulation-profile profile mode_of_oper qam_profile Example: |
Creates a preconfigured modulation profile, where the burst parameters are set to their default values for each burst type. |
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Step 4 |
Controller Upstream-Cable slot/subslot/port Example: |
Enters the controller interface configuration mode. |
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Step 5 |
us-channel n modulation-profile primary-profile-number [secondary-profile-number] [tertiary-profile-number] Example: |
Assigns up to three modulation profiles to an upstream port. |
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Step 6 |
end Example: |
Exits controller configuration submode and returns to privileged EXEC mode. |
| Command or Action | Purpose | |
|---|---|---|
|
Step 1 |
enable Example: |
Enables privileged EXEC mode. Enter your password if prompted. |
|
Step 2 |
configure terminal Example: |
Enters global configuration mode. |
|
Step 3 |
controller upstream-cable slot/subslot/port Example: |
Specifies the controller interface line card and enters upstream controller config configuration submode. |
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Step 4 |
us-channel rf-channel frequency freq-val Example: |
Assigns frequency to an RF channel on a controller interface. |
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Step 5 |
us-channel rf-channel docsis-mode mode Example: |
Assigns DOCSIS mode to an RF channel on a controller interface. |
|
Step 6 |
us-channel rf-channel channel-width value Example: |
Assigns channel width in Hertz to an RF channel on a controller interface. |
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Step 7 |
us-channel rf-channel modulation-profile profile Example: |
Assigns modulation profile to an RF channel on a controller interface. |
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Step 8 |
no us-channel rf-channel shutdown Example: |
Enables the upstream channel. |
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Step 9 |
end Example: |
Exits upstream controller configuration submode and returns to privileged EXEC mode. |
| Command or Action | Purpose | |
|---|---|---|
|
Step 1 |
enable Example: |
Enables privileged EXEC mode. Enter your password if prompted. |
|
Step 2 |
configure terminal Example: |
Enters global configuration mode. |
|
Step 3 |
interface cable slot/subslot/cable-interface-index Example: |
Specifies the cable interface line card on a Cisco CMTS router. |
|
Step 4 |
downstream integrated-cable slot/subslot/port rf-channel rf-chan [upstream grouplist] Example: |
Associates a set of upstream channels to the integrated downstream channels. |
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Step 5 |
upstream md-us-chan-id upstream-cable slot/subslot/port us-channel rf-channel Example: |
Associates a set of physical upstream channels with the Mac Domain. |
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Step 6 |
cable upstream bonding-group id Example: |
Creates the upstream bonding group on the specified cable interface and enters upstream bonding configuration submode. |
|
Step 7 |
upstream number Example: |
Adds an upstream channel to the upstream bonding group.
|
|
Step 8 |
attributes value Example: |
Modifies the attribute value for the specified upstream bonding group. |
|
Step 9 |
end Example: |
Exits upstream bonding configuration submode and returns to privileged EXEC mode. |
Feature History
| Feature Name |
Release Information |
Feature Description |
|---|---|---|
|
Upstream Channel Priority |
Cisco IOS XE Bengaluru 17.6.1w |
This feature allows the cable modem to do the initial ranging on the upstream channel with the highest priority. |
Starting from Cisco IOS XE Bengaluru 17.6.1w release, you can use the cable upstream priority command to configure the upstream channel with different priorities.
Router(config-if)# cable upstream 0 priority 1You can also run this command for mac-domain profile.
Router(config-profile-md)# cable upstream 0 priority 2Use show cable mac-domain mdd | in MD-US command to check the upstream channel priority.
Router#show cable mac-domain c3/0/1 mdd | in MD-US
MD-US Chan ID/CM-STATUS: 1/0x0000
MD-US Chan Priority: 3
MD-US Chan DCID Binding: 9 10 11 12 13 14 15 16
MD-US Chan ID/CM-STATUS: 2/0x0000
MD-US Chan Priority: 4
MD-US Chan DCID Binding: 9 10 11 12 13 14 15 16
MD-US Chan ID/CM-STATUS: 3/0x0000
MD-US Chan Priority: 5
MD-US Chan DCID Binding: 9 10 11 12 13 14 15 16
MD-US Chan ID/CM-STATUS: 4/0x0000
MD-US Chan Priority: 0
...
us-channel 0 frequency 20000000
us-channel 0 channel-width 3200000 3200000
us-channel 0 power-level 0
us-channel 0 docsis-mode tdma
us-channel 0 minislot-size 2
us-channel 0 modulation-profile 21
no us-channel 0 shutdown
...
...
interface Cable8/0/0
downstream Modular-Cable 8/0/0 rf-channel 0
upstream 0 Upstream-Cable 8/0/0 us-channel 0
upstream 1 Upstream-Cable 8/0/0 us-channel 1
cable mtc-mode
cable upstream bonding-group 1
upstream 0
upstream 1
attributes 80000000
...
| Description | Link |
|---|---|
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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 |
|---|---|---|
|
Upstream Interface Configuration |
Cisco IOS XE Fuji 16.7.1 |
This feature was integrated on theCisco cBR Series Converged Broadband Routers. |
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