D-MPT

Table Of Contents

Modular Cable Modem Termination System DOCSIS MPEG Transport Manual Mode

Finding Feature Information

Contents

Prerequisites for M-CMTS D-MPT Manual Mode

Restrictions for M-CMTS D-MPT Manual Mode

Information About M-CMTS D-MPT Manual Mode

How to Configure M-CMTS D-MPT Manual Mode

Creating DEPI Manual Sessions

Restrictions

Example

Displaying DEPI Manual Sessions

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

Feature Information for M-CMTS D-MPT Manual Mode

Glossary

Modular Cable Modem Termination System DOCSIS MPEG Transport Manual Mode

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First Published: January 8, 2009

Last Updated: March 20, 2009

The Modular Cable Modem Termination System (M-CMTS) DOCSIS MPEG Transport (D-MPT) Manual Mode feature on the Cisco RF Gateway 10 (RFGW-10) Universal Edge Quadrature Amplitude Modulation (UEQAM) processes the D-MPT traffic from the M-CMTS core.

You can use the CLI to set up D-MPT sessions manually.

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 for M-CMTS D-MPT Manual Mode" section.

Use Cisco Feature Navigator to find information about platform support and Cisco IOS, Catalyst OS, and Cisco IOS XE software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Contents

•Prerequisites for M-CMTS D-MPT Manual Mode

•Restrictions for M-CMTS D-MPT Manual Mode

•Information About M-CMTS D-MPT Manual Mode

•How to Configure M-CMTS D-MPT Manual Mode

•Additional References

•Command Reference

•Feature Information for M-CMTS D-MPT Manual Mode

•Glossary

Prerequisites for M-CMTS D-MPT Manual Mode

•You must use EQAM software and hardware revisions with Downstream External PHY Interface (DEPI) support.

Restrictions for M-CMTS D-MPT Manual Mode

•The Cisco uBR10000 Series Universal Broadband Router Shared Port Adapter (SPA) Controller configuration should match both the EQAM Gigabit Ethernet and 10 Gigabit Ethernet configuration and the RF configuration.

•The dest_ip_address must be of the front panel Gigabit Ethernet port on the Cisco RFGW-10 UEQAM that is connected to the SPA on the Cisco uBR10000 Series Universal Broadband Router.

Information About M-CMTS D-MPT Manual Mode

The interface between the M-CMTS Core and the EQAM is defined by the Downstream External PHY Interface (DEPI), which is an IP tunnel containing both a data path for DOCSIS frames, and a control path for session set-up, maintenance, and tear-down. It is based on the Layer 2 Tunneling Protocol version 3 (L2TPv3). It defines two basic encapsulation techniques for DOCSIS: the DOCSIS MPT (D-MPT) mode, and the Packet Streaming Protocol (PSP) mode. D-MPT places integer number of MPEG transport packets (TP) into the L2TP payload. This mode is defined for interoperability with legacy video QAM devices. Only one D-MPT flow can be present in a QAM channel. The EQAM extracts the MPEG transport packets within the DEPI payload and forwards them to the output QAM.

Bonded DOCSIS through downstream channel bonding is a technique of grouping multiple QAM channels into a bonding group to provide a logical downstream channel with larger aggregated bandwidth. Bonded traffic can be encapsulated in D-MPT. In D-MPT mode, the DOCSIS frame is first encapsulated in 188-byte MPEG-TS packets, and then placed into the L2TPv3. You can place up to 7 MPEG-TS packets in a single IP packet.

D-MPT traffic from the M-CMTS Core will contain SYNC messages (DOCSIS time stamps). The EQAM will find all the SYNC messages in the D-MPT payload and correct the SYNC values.

The D-MPT mode is considered "best-effort" mode. This means that all attempts are made to process the D-MPT data with the lowest delay through both the network and the EQAM, but no guarantee of quality of service (QoS) is offered.

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Note The PSP mode is not supported in this release.

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How to Configure M-CMTS D-MPT Manual Mode

This section describes how to configure M-CMTS D-MPT Manual Mode in Cisco RFGW-10 UEQAM:

•Creating DEPI Manual Sessions

•Displaying DEPI Manual Sessions

Creating DEPI Manual Sessions

This section describes how to configure DEPI Manual Sessions.

Restrictions

•The session ID used should match with the controller configuration of the SPA on the Cisco uBR10000 Series Universal Broadband Router.

•The session ID should be unique, and cannot be shared with other DEPI sessions configured in the same chassis.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface qam slot/port.channel

4. cable mode depi local

5. cable depi dest_ip ip_addr session-id id#

6. exit

7. write memory

DETAILED STEPS

	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	interface qam slot/port.channel Example: Router(config)# interface qam 3/1.1	Configures the interface on the QAM line card and enters interface configuration mode.
Step 4	cable mode depi local Example: Router(config-if)# cable mode depi local	Configures the QAM interface for the DEPI. You should set the DEPI mode before further configurations. Although the mode setting is at QAM channel level, all channels in a QAM port should be assigned to DEPI.
Step 5	cable depi dest_ip ip_addr session-id id# Example: Router(config-if)# cable depi dest_ip 1.1.1.1 session-id 1	Configures a DEPI session with the session destination IP address on the Cisco RFGW-10 UEQAM and the session ID.
Step 6	exit Example: Router(config-depi-class)# exit	Exits the interface configuration mode.
Step 7	write memory Example: Router# write memory	Saves your settings to the nonvolatile random access memory (NVRAM) to ensure that the system retains the settings after a power cycle.

Example

The following sample output of the show running interface qam slot/port.channel command shows the DEPI Manual Session configured on the Cisco RFGW-10 UEQAM:

Router# show running interface qam 3/1.1

Building configuration... 

Current configuration : 196 bytes

!

interface Qam3/1.1

cable mode depi local

no cable downstream rf-shutdown

cable downstream frequency 477000000

cable depi dest-ip 11.12.13.15 session-id 311

Displaying DEPI Manual Sessions

To display the DEPI Manual Session details, use the following command in privileged EXEC mode:

Router# show cable depi-sessions manual {summary | session id}

The following is sample output for the show cable depi-sessions manual summary command:

Router# show cable depi-sessions manual summary

List of the Configured Depi Sessions 

ID          Type                State      Qam-info   PWtype 

x-----------x-------------------x----------x----------x--------

311         MANUAL_DEPI_OVER_IP ACTIVE     Qam3/01.1  DMPT

11012       MANUAL_DEPI_OVER_IP ACTIVE     Qam3/01.2  DMPT

11013       MANUAL_DEPI_OVER_IP ACTIVE     Qam3/01.3  DMPT

30011       MANUAL_DEPI_OVER_IP ACTIVE     Qam5/01.1  DMPT

30012       MANUAL_DEPI_OVER_IP ACTIVE     Qam5/01.2  DMPT

30013       MANUAL_DEPI_OVER_IP ACTIVE     Qam5/01.3  DMPT

The following is sample output for the show cable depi-sessions manual session id command:

Router#show cable depi-sessions manual 311

Detailed Info about Session with id# 311:

                Type               : MANUAL_DEPI_OVER_IP

                Name               : 

                State              : ACTIVE

                Remote id          : 0

                DestIP addr        : 11.12.13.15

                Qam slotid         : 3

                Qam portid         : 1

                Qam ch id          : 1

                Payload type       : DEPI_PW_TYPE_D_MPT

                Sync Mode          : ENABLE

                Sync Intl          : 100

                Up time            : 00:08:26

                << Session Statistic >>

                Session is off     : 0

                Broken seq num     : 0

                Bad depi header    : 0

                Bad MPEG sync byte : 0

                In packet rate     : 417 pps

                In bit rate        : 959048 bps

                Out bit rate       : 818936 bps

                << Flow Statistic >>

                Total packet       : 7060

                Total byte         : 1327280

                Total segment      : 7060

                Discards           : 0

                Errors             : 0

                Bad pyld size      : 0

                Cmnd buf ovfw      : 0

Additional References

The following sections provide references related to the M-CMTS D-MPT Manual Mode feature.

Related Documents

Related Topic	Document Title
Cisco RFGW-10 commands	Cisco RF Gateway 10 Command Reference http://www.cisco.com/en/US/docs/cable/rf_gateway/command/reference/RFGW-10_Book.html
New Software Features in Cisco IOS Release 12.2SQ	Cisco RF Gateway 10 Software Feature and Configuration Guide http://www.cisco.com/en/US/docs/cable/rf_gateway/feature/guide/rfgw_scg.html

Standards

Standard	Title
CM-SP-DEPI-I07-100115	Data-Over-Cable Service Interface Specifications Modular CMTS Downstream External PHY Interface Specification

MIBs

MIB	MIBs Link
DOCS-IF-MCMTS-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

RFCs

RFC	Title
No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.	—

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/techsupport

Command Reference

The following commands are introduced or modified in the feature or features documented in this module. For information about these commands, see the Cisco RF Gateway 10 Command Reference at http://www.cisco.com/en/US/docs/cable/rf_gateway/command/reference/RFGW-10_Book.html. For information about all Cisco IOS commands, use the Command Lookup Tool at http://tools.cisco.com/Support/CLILookup or the Cisco IOS Master Command List, All Releases, at http://www.cisco.com/en/US/docs/ios/mcl/allreleasemcl/all_book.html.

•interface qam slot/port.channel

•cable mode depi local

•cable depi dest_ip ip_addr session-id id#

•show cable depi-sessions manual {summary | session id}

Feature Information for M-CMTS D-MPT Manual Mode

Table 1 lists the release history for this feature.

Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS, Catalyst OS, and Cisco IOS XE 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.

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Note Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.

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Table 1 Feature Information for M-CMTS D-MPT Manual Mode 

Feature Name	Releases	Feature Information
M-CMTS D-MPT Manual Mode	12.2(44)SQ	This feature was introduced in the Cisco IOS Release 12.2(44)SQ to support the Cisco RF Gateway 10. The following commands were introduced or modified: •interface qam slot/port.channel •cable mode depi local •cable depi dest_ip ip_addr session-id id# •show cable depi-sessions manual {summary | session id}

Glossary

DEPI—Downstream External PHY Interface

D-MPT—DOCSIS MPEG Transport

DOCSIS—Data Over Cable Service Interface Specifications

EQAM—Edge Quadrature Amplitude Modulation. A network element, which receives MPEG-TS frames over a network interface such as Ethernet, and modulates them onto QAM carriers for use on an HFC plant.

L2TPv3—Layer 2 Tunneling Protocol version 3

M-CMTS—Modular Cable Modem Termination System

PSP—Packet Streaming Protocol

QoS—Quality of Service

SPA—Shared Port Adapter

Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R)

Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.

© 2009 Cisco Systems, Inc. All rights reserved.