Cadant C3 CMTS User Documentation(Release 4.4 Standard, October 2006) (2)

8/10/2019 Cadant C3 CMTS User Documentation(Release 4.4 Standard, October 2006) (2)

1/742

ARRIS PROPRIETARY

This document contains proprietary information of ARRIS, Inc. and is not to be disclosed

or used except in accordance with applicable agreements.

2006 ARRIS

All Rights Reserved

10/25/06

CadantC3 CMTSCable Modem Termination System

C3 CMTS

User Documentation

Documentation Set

Release 4.4, Standard

October 2006


2/742

2006 ARRISAll rights reserved.

Copyright and Trademark Information

CadantC3

CadantC4

Keystone D5

ARRISand Arris Interactive are trademarks of ARRIS International, Inc. Cadant C3 CMTS is aregistered trademark of ARRIS Licensing Company. All other trademarks and registeredtrademarks are the property of their respective holders.

Every attempt has been made to capitalize and spell correctly the trademarked and servicemarked terms used in this manual. ARRIS does not attest to the accuracy of these terms and theirusage. Any misspelling or misuse of a term should not be construed as affecting the validity of itstrademark or service mark.

All information contained in this document is subject to change without notice. ARRIS reserves theright to make changes to equipment design or program components, as progress in engineering,manufacturing methods, or other circumstances may warrant.

The ARRIS CadantC3 Cable Modem Termination System (CMTS) has been qualified by

CableLabsfor DOCSIS1.1 and 2.0 and by tComLabs for Euro-DOCSIS 1.1.

STANDARD LICENSE AGREEMENT AND LIMITED WARRANTY

This Standard License Agreement and Limited Warranty (Agreement) applies to all ARRIS manu-factured or otherwise ARRIS provided products (Products) and the corresponding current andsubsequently provided versions of software, if any, whether embedded in the Products or used inconjunction with the Products, (Software). The Software in conjunction with the Products isreferred to in this Agreement as the (System).

If you (You or Purchaser) and ARRIS International, Inc. (ARRIS) have entered into a separatewritten agreement, then, inconsistent terms between this Agreement and the separate agreementshall be governed by such separate agreement.

If You do not agree to be bound by this Agreement, please return the Products to the Party fromwhom You acquired the Products. Use of the Products shall constitute acceptance of the termshereof.

1. License TermsSubject to the terms herein, ARRIS grants You a royalty-free, non-exclusive, non-transferable,non-sublicensable license to use the Software with the Products, in binary object code form only.You may use third party software products or modules supplied by ARRIS solely with the System,unless the licensing terms of the third party software specify otherwise. You may not disclose the

results of Software performance benchmarks to any third party without ARRIS prior writtenconsent. All rights not specifically granted to You herein are retained by ARRIS.

2. RestrictionsYou and/or any third party agree not to (i) make any copies of the Software, (ii) modify,decompile, disassemble, separate, reverse engineer or otherwise attempt to derive any source


3/742


code from the Software; (iii) transfer the Software to any third party without ARRIS writtenconsent; (iv) export the Software or any of its underlying technology in contravention of U.S. andforeign export laws and regulations, or (v) if Products are included, use the Software other than inconnection with the System.

3. UseThe right to use the Software, or any individual feature thereof, may be restricted by a measure ofusage. An expansion beyond a commercially reasonable usage level may require payment of anadditional fee to ARRIS.

4. Software Developed at Private ExpenseThe Software provided under this Agreement is commercial computer software developedexclusively at private expense, and in all respects are proprietary data belonging solely to ARRISand/or it licensors.

5. Limitations on LiabilityNEITHER ARRIS NOR ITS LICENSORS SHALL BE LIABLE FOR INDIRECT, INCIDENTAL, PUNITIVE,CONSEQUENTIAL, EXEMPLARY, OR SPECIAL DAMAGES UNDER ANY THEORY OF LIABILITY,

WHETHER ALLEGED AS A BREACH OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICTLIABILITY OR OTHERWISE AND REGARDLESS OF WHETHER YOU, ANY OTHER SOFTWARE USER,OR ANY THIRD PARTY SUFFERED SUCH DAMAGES, EVEN IF ARRIS AND/OR ITS LICENSORSHAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. IN NO EVENT WILL ARRISTOTAL LIABILITY TO YOU OR ANY THIRD PARTY ARISING OUT OF OR PURSUANT TO THISAGREEMENT EXCEED THE AMOUNT PAID BY PURCHASER TO ARRIS FOR THE SOFTWARE AND/OR SYSTEM.

6. Term & TerminationThis Agreement takes effect upon Your acceptance of the terms hereof or Your first use of theSoftware and will remain in force until terminated in accordance hereunder. ARRIS may terminatethis Agreement upon fifteen (15) days prior written notice upon Your material breach of this

Agreement if such breach is not cured within such fifteen (15) day period. Notwithstanding theforegoing, this Agreement shall terminate immediately upon Your breach of any of the provisionsof Section 2 above.

7. OwnershipTitle, ownership rights, and all intellectual property rights in and to the Software and/or Systemand any accompanying materials or documentation, and any copy of the foregoing, shall remainthe sole and exclusive property of ARRIS and/or its licensors. You agree to abide by copyright lawsand all other applicable laws, and acknowledge that the Software contains valuable confidentialinformation and trade secrets of ARRIS and/or its licensors.

8. Your Indemnification to ARRISYou agree to defend, indemnify and hold ARRIS harmless from and against any costs, losses,

liabilities and expenses (including attorneys fees) arising out of or relating to third party claimsarising out of or related to Your use of the Software and/or System in contravention to the termsof this Agreement, including without limitation, any and all claims, actions, suits, or proceedingsalleging fraud, breach of security, non-compliance with laws, breach of contract or negligence.


4/742


9. Patent Indemnification9.1ARRIS will indemnify, defend and hold You harmless against damages, liabilities and costs,excluding consequential and exemplary damages finally awarded against You and will, atARRIS expense, defend any claim, suit or proceeding (Claim) brought against You insofar assuch Claim is based on an allegation that the Products as provided to You directly infringe a

United States patent or copyright. ARRIS will pay those costs and damages, including settle-ment costs awarded or agreed-upon, as applicable, as the result of the Claim, provided (i) Youpromptly notify ARRIS of the Claim (ii) You give ARRIS all applicable evidence in Your posses-sion, custody or control, (iii) You give ARRIS reasonable assistance in and sole control of thedefense and all negotiations for its settlement or compromise, and (iv) You have paid all feesdue to ARRIS under this Agreement and continue to pay all such fees as such become due.

9.2In the event of an infringement allegation for which ARRIS is obligated to indemnify You,ARRIS may at its discretion: (i) obtain a license that allows You to continue to use the accusedProducts, (ii) replace or modify the accused Products with changes that reasonably meet theARRIS specification, so as to be non-infringing, or (iii) if (i) and (ii) are not commercially rea-sonable, repurchase ARRIS provided Products at its depreciated value based on a three-yearamortization rate. If ARRIS provides any one of the options set forth in clauses (i) through (iii)

above, ARRIS indemnity obligation under this Agreement shall be entirely fulfilled. ARRIS lia-bility for patent infringement indemnification in this section shall not exceed the amount Youpaid for the Products finally found to infringe a valid US patent.

10. Limited WarrantyIF YOU ACQUIRED THE PRODUCTS FROM ANYONE OTHER THAN ARRIS YOU DO NOT RECEIVEANY OF THE WARRANTIES DIRECTLY FROM ARRIS. YOUR EXCLUSIVE WARRANTY, IF ANY,COMES FROM THE PARTY FROM WHOM YOU ACQUIRED THE PRODUCTS: IN WHICH CASE THEREMAINDER OF THIS DOCUMENT, EXCEPT FOR THE ARRIS TOUCHSTONE PRODUCTS SAFETYINFORMATION, DOES NOT APPLY TO YOU.

11. Software Warranty

ARRIS warrants to the original purchaser that for ninety (90) days from the ship date of the

original ARRIS branded Software (the Software Warranty Period), the Software will perform insubstantial conformance with the technical specifications for such Software set forth in theDocumentation. Your sole and exclusive remedy, and ARRIS sole and exclusive liability under thisSection 11 (Software Warranty) shall be, at ARRIS option: (i) to use commercially reasonableefforts to correct any reproducible errors that You identify in writing during the Software WarrantyPeriod which renders the Software non-conforming, (ii) to replace the Software with functionallyequivalent software or (iii) to accept Your return of the Software, if applicable. ARRIS does notwarrant that the Software will work in combination with any hardware or application softwareproducts provided by third parties not supplied or approved by ARRIS, that the operation of theSoftware will be uninterrupted or error free, or that all defects in the Software can be corrected.ARRIS shall not have any obligation or liability with respect to this Section 11 for any errors or anydefects in the Software upon expiration of the Software Warranty Period.


5/742


12. Hardware Warranty12.1ARRIS warrants to the original Purchaser of the hardware that under normal use and ser-vice, for twelve (12) months from the ship date (the Hardware Warranty Period) of the Hard-ware, it will be free from defects in material and workmanship. Your sole and exclusive remedyand ARRIS sole and exclusive liability under this Section 12 shall be, at ARRIS option: (i) to

use commercially reasonable efforts to correct any reproducible Hardware errors that You iden-tify in writing during the Hardware Warranty Period which renders the Hardware non-con-forming, (ii) to replace the Hardware or (iii) accept return of the Hardware from Purchaser.ARRIS shall not be responsible for any of Your or third party software, firmware, informationor memory data contained in, stored on, or integrated with any Hardware Products returned toARRIS pursuant to any Warranty provided under this Agreement.

12.2ARRIS does not warrant (1) physical damage to the surface of the products, includingcracks or scratches on the casing; (2) damage caused by misuse, neglect, improper installationor testing, unauthorized attempts to open, repair or modify the products, or any other causebeyond the range of the intended use; (3) damage caused by accident, fire, power changes,other hazards, or acts of God.

12.3Battery Pack. If Your product has a battery pack, ARRIS warrants that the battery pack

will be free from defects in workmanship and materials, under normal use, for twelve (12)months from its ship date.

13. Warranty ClaimsTo make a return under the Warranty above, You must contact the ARRIS Repair Services centerwithin the applicable warranty period, in writing, by sending an E-mail to [email protected] toobtain an ARRIS Return Material Authorization number (RMA). The authorized RMA number Youreceive from ARRIS must be marked on the outside package and sent prepaid and packagedappropriately for safe shipment. ARRIS will use commercially reasonable efforts to ship anyrepaired or replaced Product to You, at ARRIS expense, not later than thirty (30) days after ARRISreceives the defective Product. ARRIS warrants the repaired or replaced Hardware or Software forthe longer of the remainder of the unexpired applicable Warranty Period or 90 days.Notwithstanding the above, if any return is due to errors or defects for which ARRIS is notresponsible or not otherwise covered by the Warranty, You shall be liable for and reimburse ARRISfor shipping and related expenses.

14. Disclaimer of WarrantyEXCEPT AS AGREED TO IN A SEPARATE WRITING BETWEEN THE PARTIES, THESE WARRANTIESARE IN LIEU OF ALL OTHER WARRANTIES WITH RESPECT TO THE SOFTWARE AND/OR SYSTEMDELIVERED TO YOU HEREUNDER, WHETHER STATUTORY, BY OPERATION OF LAW, EXPRESS ORIMPLIED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTY OF MERCHANTABILITY,FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, TITLE AND ANY WARRANTIESARISING OUT OF USAGE OR TRADE. THIS WARRANTY IS APPLICABLE SOLELY TO YOU AND NOTTO ANY SUCCESSOR IN INTEREST OR ANY OTHER THIRD PARTY. NO WAIVER, ALTERATION, ORMODIFICATION OF THIS WARRANTY SHALL BE BINDING AGAINST ARRIS UNLESS IN WRIT-ING

AS A SEPARATE AMENDMENT HERETO AND SIGNED BY AN ARRIS AUTHORIZED EXECUTIVE.

15. Warranty LimitationsARRIS shall be relieved of all obligations and liability under the Warranty provisions set forthherein, if:


6/742


a The Hardware or Software is operated with, or the error or defect is due to, any accessory,equipment, software or part not approved or sold by ARRIS; or

b The Hardware or Software was not installed, operated and maintained in accordance withARRIS instructions and Documentation; or

c The Hardware or Software has been repaired, altered or modified by someone other thanARRIS; or

d You do not notify ARRIS in writing of the error or defect within the applicable Warranty Periodwith sufficient information for ARRIS to identify and reproduce such error or defect, or fail toreturn the defective Hardware or Software according to the terms of this Agreement; or

e ARRIS demonstrates that the alleged error or defect in the Software or Hardware does not existor was caused by Your or any third partys misuse, neglect, improper installation or testing, ornegligent repair or any other cause beyond the range of the intended use, or by accident, fire,lightening or other hazard or act of God.

16. Miscellaneous16.1If any term, condition, or provision in this Agreement is found to be invalid, unlawful or

unenforceable to any extent, the remaining terms, conditions and provisions will continue to bevalid and enforceable to the fullest extent permitted by law.

16.2You may not assign or transfer this Agreement nor any rights hereunder, in whole or inpart, whether voluntary or by operation of law without ARRIS prior written consent. Subject tothe foregoing, this Agreement will be binding upon and will inure to the benefit of the partiesand their respective successors and assigns.

16.3This Agreement (including any addenda hereto signed by both parties) represents theentire agreement of the parties with respect to the subject matter of this Agreement and super-sedes all previous communications, representations, understandings and agreements, eitheroral or written, between the parties with respect to said subject matter.

16.4This Agreement may not be amended, except in writing, signed by both parties. No terms,provisions or conditions of any purchase order, acknowledgment or other business form that

You may use in connection with the acquisition or licensing of the Software will have any effecton the rights, duties or obligations of the parties under, or otherwise modify, this Agreement,regardless of any failure of ARRIS to object to such terms, provisions or conditions.

16.5The laws of the State of Georgia, USA shall govern and construe this Agreement. Any suitbrought in connection with this Agreement shall be subject to the exclusive jurisdiction of theState Court of Georgia or the Federal Courts for the Northern District of Georgia and You herebyagree and submit to the personal jurisdiction and venue thereof.

17. Safety Information for ARRIS Touchstone ProductsARRIS telephony modems and cable modems comply with the applicable requirements forperformance, construction, labeling, and information when used as outlined in this Section 17:

17.1Caution: Only a professional installer may connect the telephony modem to the homes

existing telephone wiring. Physical connections to the previous telephone provider must beremoved and the wiring must be checked; there must not be any voltages. Cancellation of tele-phone service is not sufficient to ensure there is no power to the telephony modem. Failure todo so may result in loss of service and/or permanent damage to the telephony modem.

17.2Do not use the product near water (e.g., wet basement, bathtub, sink or near a swimmingpool), to avoid risk of electrocution.


7/742


17.3Avoid using and/or connecting the equipment during an electrical storm, to avoid risk ofelectrocution.

17.4Do not locate the product within 6 feet (2 m) of a flame or ignition source, to avoiddamage or injury from battery explosion, or heat damage.

17.5Use only the power supply and/or power cord included with the Product. Install theProduct near and easily accessible to the power outlet. Ground the RF drop cables shield at thebuilding/residence either close to the point of entrance or at the point of attachment. Groundingas close as practical to the building/residence AC ground is required to minimize grounding con-nector length and thereby limit the potential voltage differences between the cable TV coaxialcable and other grounding system. Refer to the individual countrys National Electric Code forfurther details.

17.6In areas of high AC power surge events or poor AC power grounding situations and areasprone to lightning strikes additional AC power surge protection may be required on the AC, RF,Ethernet, USB and phone lines.

17.7If connecting the telephony modem or cable modem to a local computer through theEthernet or USB cable the computer must be properly grounded to the building/residence AC

ground network. All plug-in cards within the computer must be properly installed and groundedto the computer frame per the manufacturers specifications.


8/742



9/742

Release 4.4, Standard ARRIS PROPRIETARY All Rights Reserved ix

Table of Contents

1 About this Manual

Scope 1-1

In this Document 1-2

Conventions Used in This Manual 1-3

For More Information 1-4

FCC Statement 1-4

Safety 1-4

2 Getting Started

About the C3 CMTS 2-1

Fast Start 2-2

Introducing the ARRIS Cadant C3 CMTS 2-2

Major Components of the Cadant C3 CMTS 2-8

3 CMTS Installation

Planning the Installation 3-1

4 Bridge Operation

Terms and Abbreviations 4-2

Bridging Features 4-3

Bridge Concepts 4-4

Bridge Binding 4-14

IP Addressing 4-16

Attaching Bridge Groups 4-18

Incoming Traffic Allocation to a Sub-Interface 4-19


10/742

x ARRIS PROPRIETARY All Rights Reserved 10/25/06

Table of Contents C3 CMTS

5 Providing Multiple ISP Access

Open Access 5-1

Cable-VPN Implementation 5-3

Using the Modem IP Address to allocate CPE to a VPN 5-5

Using a Modem Configuration File to Allocate CPEs to a VPN 5-12

6 IP Routing

Routing Concepts 6-1

About RIP 6-3

About OSPF 6-3

Loopback Interfaces 6-8

Multicast Operations 6-9

Layer 3 Multicast Operation 6-12

Routing Command Overview 6-13

OSPF Point-To-Multipoint 6-14

OSPF User interface 6-16

Route-Maps 6-17

Match Clauses 6-19

Provisioning Route-Maps 6-20

Displaying Route-maps 6-20

OSPF Route Redistribution Filtering 6-21

7 Managing Cable Modems

Changing the Upstream Channel Type 7-3

DHCP 7-3

Data Errors 7-23

Provisioning Upstream Load Balancing 7-24

8 Configuring Security

Overview 8-2Physically Separating Data 8-3

Filtering Traffic 8-7

Cable Interface VLANS 8-27


11/742

C3 CMTS Table of Contents

Release 4.4, Standard ARRIS PROPRIETARY All Rights Reserved xi

Cable Source Verify 8-32

Packet Throttling 8-34

Broadcast Throttling 8-35

IP Throttling 8-35

Simple Law Enforcement Monitoring (SLEM) 8-36

Configuring SSH 8-39

Authentication, Authorization, and Accounting (AAA) 8-44

AAA Feature 8-44

AAA Method List Operation 8-52

CLI Infrastructure 8-53

AAA Authentication Commands 8-55

AAA Authorization Commands 8-56

AAA Accounting Commands 8-58

TACACS+ Commands 8-60

9 Service Procedures

Removing Power for Servicing 9-2

Resetting the Power Supplies 9-3

Replacing a Power Supply 9-4

Fan Tray Replacement 9-5

Replacing the Battery 9-5

Replacing the RF Card 9-8

Replacing Fuses 9-9

Upgrading the CMTS Software 9-10

Enabling Licensing Features 9-17

Upgrading Dual Upstream Receivers (DOCSIS 2.0 Systems) 9-19

10 PacketCable Multimedia (PCMM)

PacketCable Multimedia Overview 10-1

PCMM Core Functionality 10-2

COPS Communication Layer 10-3PCMM Messages 10-4

PCMM Gate Database 10-5

PCMM Gate Transactions 10-6


12/742

xii ARRIS PROPRIETARY All Rights Reserved 10/25/06


Gate Database Synchronization with Policy Server 10-6

Debugging and Logging 10-7

PCMM Timers 10-7

CLI Commands 10-10

Common CLI Commands 10-10

Debug Commands 10-11

Show Commands 10-12

11 Command Line Interface Reference

User Mode Commands 11-6

User Mode SHOW Commands 11-15

Privileged Mode Commands 11-31

Privileged SHOW Commands 11-54

Global Configuration Commands 11-117

Configure-keychain Mode 11-219

Configure Line Mode 11-222

Interface Configuration Commands 11-224

Router Configuration Mode 11-315

List of CLI Commands

A Specifications

Product Specifications A-1

B CMTS Configuration Examples

C3 CMTS Install B-2

DebugWhat to Do if DHCP is Not Working B-5Simple Bridging B-6

Simple Bridging with Separate Management Traffic B-8

Bridging, Separate Management Traffic, CM and CPE DHCP Servers B-11


13/742


Release 4.4, Standard ARRIS PROPRIETARY All Rights Reserved xiii

Advanced Bridging B-13

Simple IP Routing Network B-23

Routing, Separate Management Traffic B-24

Hybrid operation B-26

C Wireless Cable Applications

Overview C-1

Feature Summary C-2

Configuration C-2

User Interface C-3

SNMP C-4

D DS1 Applications

Provisioning Summary D-2

Example Modulation Profile D-2

Example Cable Modem Configuration File D-3

E SLEM MIB

F Quality of Service (QoS)

Introduction F-1

Best Effort QoS F-2

Docsis 1.1 token bucket F-2

Fairness implementation F-2

Priority implementation F-3

Downstream non-unicast traffic F-4

Upstream request opportunities F-5

Channel overhead F-6

Downstream overhead F-6

Upstream overhead F-7

Channel configuration changes F-9

Admissions F-10

Downstream admission F-10

Upstream admission F-10


14/742

xiv ARRIS PROPRIETARY All Rights Reserved 10/25/06


Controlling bunching F-10

Dominant interval F-10

SCDMA frames F-11

Debugging admission F-12

Customization via configuration F-14

Rate limiting F-14

Admission capacity F-14

Over-subscription F-14

Priority parameter usage F-15

Downstream-specific configuration F-15

Upstream-specific configuration F-16

Common traffic types F-17

Upstream single modem throughput F-17UDP F-18

TCP F-18

Voice F-19

DS1/T1 F-22

Cellular backhaul F-22

IP video F-23

QoS capabilities F-24

Admission capacity F-24

Utilization F-24

Grant/Poll intervals F-24

Grant/Poll jitters F-25

Modem configuration file contents F-25

Static voice packet flow F-25

Static voice packet flow with SIP snooping F-26

Dynamic voice packet flow with secondary signaling flow F-27

Dynamic voice packet flow with primary signaling flow F-28

DS1 configuration F-28

G Factory Defaults

Default Configuration Listing G-2

Default Modulation Profiles G-19


15/742


Release 4.4, Standard ARRIS PROPRIETARY All Rights Reserved xv

H Configuration Forms

Fastethernet 0/0 Configuration H-3

Fastethernet 0/1 Configuration H-4

Cable Configuration H-6

I C3 CMTS Syslog Events and SNMP Traps

Syslog Events I-1

SNMP Traps I-9


16/742

xvi ARRIS PROPRIETARY All Rights Reserved 10/25/06



17/742

Release 4.4, Standard ARRIS PROPRIETARY All Rights Reserved xvii

List of Figures

2 Getting Started

Figure 2-1: Major components of the C3 CMTS 2-5

Figure 2-2: Front panel of C3 CMTS 2-5

Figure 2-3: Rear panel port identification 2-7

3 CMTS Installation

Figure 3-1: Earthing using only DC power 3-2

Figure 3-2: Example positioning of the M4 nut and lock washers 3-3

Figure 3-3: Connector and pin locations 3-4

Figure 3-4: Example of CATV System Connections 3-6

Figure 3-5: CMTS rear view 3-8Figure 3-6: LCD location 3-9

Figure 3-7: Rear panel connectors 3-11

Figure 3-8: Rear cable connections 3-21

4 Bridge Operation

Figure 4-1: Example of a bridge group 4-4

Figure 4-2: Example of a sub-interface to access different bridge groups 4-5

Figure 4-3: Example of a Management Access Only interface 4-6Figure 4-4: Illustration of the default bridge configuration 4-7

Figure 4-5: Illustration of the factory default configuration 4-8

Figure 4-6: Example of a bridging network configuration 4-9


18/742

xviii ARRIS PROPRIETARY All Rights Reserved 10/25/06

List of Figures C3 CMTS

Figure 4-7: Data flow when FastEthernet 0/1 is the boot interface 4-11

Figure 4-8: Default, V2.0 compatible, operating mode 4-12

Figure 4-9: Example of Bridge group 0 4-13

Figure 4-10: Example of Bridge group 1 4-13

Figure 4-11: Example of CMTS management traffic 4-14

Figure 4-12: Bridge binding on US Layer 2 broadcast 4-15

Figure 4-13: Example of legal use of the bridge bind command 4-16

Figure 4-14: Example of IP addressing 4-17

Figure 4-15: Example of attaching bridge groups 4-19

Figure 4-16: Example of ARRIS VSE with a VPN ID of 000Bh 4-22

Figure 4-17: Example configuration file with VSE information 4-23

5 Providing Multiple ISP Access

Figure 5-1: Example of an Open Access system 5-2

Figure 5-2: Example network diagram 5-6

Figure 5-3: Bridging data flow through the C3 CMTS 5-7

Figure 5-4: Diagram of network used in this example 5-12

Figure 5-5: How the C3 CMTS bridges data in the example 5-13

Figure 5-6: How the C3 CMTS bridges data in this configuration 5-18

6 IP Routing

Figure 6-1: OSPF two-level hierarchy 6-6

Figure 6-2: Example of an OSPF-based network redistributing RIP routes 6-7

7 Managing Cable Modems

Figure 7-1: DHCP traffic flow through the C3 CMTS in transparent mode 7-4

Figure 7-2: DHCP traffic flow with dhcp-giaddr enabled 7-15

8 Configuring Security

Figure 8-1: Simplified network diagram 8-20


19/742

C3 CMTS List of Figures

Release 4.4, Standard ARRIS PROPRIETARY All Rights Reserved xix

Figure 8-2: Example of bridging traffic to the FastEthernet 8-25

Figure 8-3: RFC 3924 framework 8-37

Figure 8-4: AAA Security Model 8-45

Figure 8-5: Method list example 8-52

9 Service Procedures

Figure 9-1: Front panel latch 9-2

Figure 9-2: Front panel faceplate 9-2

Figure 9-3: Resetting power supplies 9-3

Figure 9-4: Power supply 9-4

Figure 9-5: Fan tray 9-5

Figure 9-6: Location of battery on CPU card 9-6

Figure 9-7: Removing the CPU card 9-7

Figure 9-8: Replacing the RF card 9-8

Figure 9-9: Fuse location 9-9

Figure 9-10: Location of compact flash 9-13

Figure 9-11: IF cable routing 9-19

Figure 9-12: Adding a MAC/PHY card 9-20

Figure 9-13: Securing the dual receiver board 9-21

Figure 9-14: Fully populated MAC/PHY card 9-22

10 PacketCable Multimedia (PCMM)

Figure 10-1: Network Diagram of PCMM Implementation 10-3

B CMTS Configuration Examples

Figure B-1: Simple configuration B-2

Figure B-2: Default allocation of sub-interfaces to the default bridge groups B-7

Figure B-3: Example of bridge-group capabilities B-9

Figure B-4: Example of how an ISP based DHCP server manages CPE IP addresses B-12

Figure B-5: Example of all the C3 CMTS vs. advanced bridging and VLAN abilities B-14


20/742


21/742

Release 4.4, Standard ARRIS PROPRIETARY All Rights Reserved 1-1

Topics Page

About this Manual

Scope 1

In this Document 2

Conventions Used in This Manual 3

For More Information 4

FCC Statement 4

Safety 4

Scope

This document provides necessary procedures to install, operate, andtroubleshoot the ARRIS Cadant C3 CMTS in a DOCSIS- or EuroDOCSIS-compatible environment. It is intended for cable operators and systemadministrators who configure and operate the CMTS. It is assumed thereader is familiar with day-to-day operation and maintenance functions innetworks that rely on TCP/IP protocols and hybrid fiber/coax (HFC) cablenetworks.

This document applies to version 4.4 of the CMTS software, includingminor revisions and point releases. This software is compatible withDOCSIS/EuroDOCSIS 1.1 C3 CMTS hardware with Dual Upstream ReceiverModules that have 3138 silicon and DOCSIS/EuroDOCSIS 2.0 C3 CMTShardware with Dual Upstream Receiver Modules that have 3140 A1 or3140 A3 (internal or external A/D) silicon.


22/742

1-2 ARRIS PROPRIETARY All Rights Reserved 10/25/06

1 About this Manual

In this Document

This manual provides the following content:

Chapter 2, Getting Started, provides a brief overview of the Cadant

C3 CMTS and its components.

Chapter 3, CMTS Installation, describes how to unpack and installthe CMTS including how to bring up the CMTS from an out of boxcondition to full operation.

Chapter 4, Bridge Operation, describes basic bridge operation of theCMTS and issues in upgrading to L3 capable code to restore DHCPoperation.

Chapter 5, Providing Multiple ISP Access, describes the supported802.1Q VLAN capabilities.

Chapter 6, IP Routing, describes how to configure the C3 CMTS as alayer 3 router.

Chapter 7, Managing Cable Modems, describes common proceduresfor operating and troubleshooting DOCSIS systems.

Chapter 8, Configuring Security, describes methods that can be usedto improve security of management and user traffic.

Chapter 9, Service Procedures, describes basic service procedures.

Chapter 10, PacketCable Multimedia (PCMM), describes the PCMMfunctionality available on the C3 CMTS.

Chapter 11, Command Line Interface Reference, describes thecommand line interface for managing and configuring the CMTS.

Appendix A, Specifications, lists physical, electrical, and networkingspecifications.

Appendix B, CMTS Configuration Examples, provides a configurationfor a bench top trial. Includes both RF and CLI configuration.

Appendix C, Wireless Cable Applications, describes features relatedto wireless cable support.

Appendix D, DS1 Applications, provides example configurations forproviding circuit emulation services.

Appendix E, SLEM MIB, provides the Simple Law Enforcement Moni-toring (SLEM) MIB.

Appendix F, Quality of Service (QoS), describes QoS provisioninginformation.

Appendix G, Factory Defaults, contains default configuration infor-

mation.

Appendix H, Configuration Forms, provides a form listing essentialconfiguration parameters.

Appendix I, C3 CMTS Syslog Events and SNMP Traps, provides a


23/742

C3 CMTS User Guide


listing of supported traps and syslog events.

Conventions Used in This Manual

Various fonts and symbols are used in this manual to differentiate text thatis displayed by an interface and text that is selected or input by the user:

Highlight Use Examples

boldKeyword: Text to be typedliterally at a CLI prompt.

Type exitat theprompt.

italics Indicates a required userparameter.

ping{ipaddr}

bracketed

A parameter in a CLI command.

A parameter enclosed in[square] brackets is optional; aparameter enclosed in {curly}brackets is mandatory.

ping {ipaddr}

terminal [no] monitor

monospacedDisplay text. Shows aninteractive session of commandsand resulting output.

ipaddrIP address: enter an IP addressin dotted-quad format

10.1.105.128

macaddr

MAC address: enter a MACaddress as three 4-digit

hexadecimal numbers,separated by periods.

00a0.731e.3f84

NOTENotes are intended to highlight additionalreferences or general information related to aprocedure, product, or system.

CAUTION

Caution: Indicates an action that may disruptservice if not performed properly.

WARNINGDanger: Indicates an action that may causeequipment damage, physical injury, or death ifnot performed properly.


24/742


25/742

C3 CMTS User Guide


The remaining non-RF and non-AC supply connections of the ARRISCadant C3 CMTS should be made by SELV rated circuits.


26/742


1 About this Manual


27/742


Topics Page

2

Getting Started

About the C3 CMTS 1

Fast Start 2

Introducing the ARRIS Cadant C3 CMTS 2

Major Components of the Cadant C3 CMTS 8

This chapter introduces the ARRIS Cadant C3 Cable Modem TerminationSystem (CMTS) and provides background information about the Data-

Over-Cable Service Interface Specification (DOCSIS) standards with whichthe product complies.

About the C3 CMTS

ARRIS has designed the C3 CMTS specifically for DOCSIS and EuroDOCSISspecifications.

From its inception, it has been designed to take advantage of alreadydefined Advanced Physical Layer features as well as new noise suppressiontechnologies to deliver the most efficient utilization of the upstream spec-trum. The hardware platform itself has been designed to scale to the most

demanding needs of the operator from a packet classification and featuresperspective. The processing power of the system is capable of accommo-dating the emerging needs of cable operators worldwide.


28/742


2 Getting Started

With dual RISC processors in its architecture, the C3 CMTS supplies theprocessing power needed to support high volumes of traffic, with excellentlatency control. The CMTS has scalable transmit and receive capacity,which can be configured to support one channel downstream and up to six

channels upstream. It supports multiple network protocols, and multiplearchitectures such as PPPoE and NetBEUI, making it easy to add to existingrouter- or switch-based cable networks. Easy-to-use system managementtools include an industry-standard command-line interface.

DOCSIS Compliance The C3 CMTS is DOCSIS 1.1, DOCSIS 2.0, and EuroDOCSIS 1.1 qualified.A EuroDOCSIS-2.0 based operation is supported when used with theDOCSIS 2.0 RF card.

The C3 CMTS works on any cable system with any DOCSIS compliant orEuroDOCSIS based modems.

Fast StartThe basics of commissioning the Cadant C3 CMTS are covered in Chapter3and a complete example of a bench top installation is also provided inAppendix B.

Introducing the ARRIS Cadant C3 CMTS

The C3 CMTS is a flexible, powerful, and easy-to-use Cable Modem Termi-nation System (CMTS). It is DOCSIS 1.1, DOCSIS 2.0, and EuroDOCSIS 1.1qualified and compliant with EuroDOCSIS 2.0 standards, which includesspecifications for features such as security enhancements, telephony, QoS,

and tiered services.

The C3 CMTS has dual 10/100/1000 Mbps Ethernet interfaces andsupports a 64 or 256 Quadrature Amplitude Modulation (QAM) cable TVdownstream channel, and up to six variable-rate Quadrature Phase ShiftKeying (QPSK) or 8, 16, 32, or 64 QAM upstream channels. Easy-to-usesystem management tools include an industry-standard command-lineinterface.


29/742

C3 CMTS User Guide


Table 2-1: C3 CMTS Features and Benefits

Features Benefits

Advanced TDMAsupport: 8QAM,32QAM, and 64QAM

200 KHz to 6.4 MHzchannel width

Designed from the ground up to supportadvanced symmetrical data rate applicationsbased on the DOCSIS 1.0, 1.1, and 2.0specifications while maintaining compatibilitywith existing modems. Delivers superiorperformance in real-world cable plants throughadvanced noise cancellation technology

Compact sizeFull DOCSIS 1.1 with ATDMA support, orDOCSIS 2.0 with ATDMA and SCDMA support, ina one-rack unit high system

Operator selectable

Layer 2 and Layer 3forwarding

Allows operators to choose the routing method

most appropriate to their needs

ACL supportUp to 30 ACLs with 30 entries per ACL may beapplied to any interface

Full upstream support5 to 65 MHz

Allows better utilization of upstream frequencyspace for DOCSIS in plants outside of NorthAmerica

DOCSIS andEuroDOCSIS supportselectable in software

Provides flexibility for operators by supportingeither protocol on the same unit with noadditional hardware to purchase

PacketCable

Multimedia (PCMM)COPS DQoS

PacketCable Multimedia COPS DQoS capability

will be supported. (Note: there will be nosupport in this release for RADIUS messaging tothe RKS or IPsec.)

Efficient bandwidthmanagement

Load-balancing allows the cable operator toautomatically or manually distribute upstreamtraffic evenly across available channels.

Integrated RF up-converter

Complete ready-to-use CMTS in only one rackunit (1.75 in. of space)


30/742


31/742


32/742


33/742

C3 CMTS User Guide


Rear Panel The following diagram shows the locations of ports on the rear panel.

Figure 2-3: Rear panel port identification

>300 packets per second 200 milliseconds



less than 10 packets per second 500 milliseconds

0 packets per second not flashing

Table 2-3: LED flash rates

Traffic Rate Flash Rate

AC powerDC power

DownstreamIF

Cable 1/0Upstreams 0-5

Cable 1/0Downstream Serial Alarm

DebugLEDs

F2

-

F1Fuses

FE1 FE0CompactFlash

AC powerDC power

DownstreamIF

Cable 1/0Upstreams 0-5

Cable 1/0Downstream Serial Alarm

DebugLEDs

F2

-

F1Fuses

FE1 FE0CompactFlash

DOCSIS 1.X C3 CMTS

DOCSIS 2.X C3 CMTS

TSTCLK OUT


34/742


2 Getting Started

The following table describes the ports on the rear panel.

NOTEARRIS does not support simultaneous use of the Downstream andDownstream IF outputs.

Major Components of the Cadant C3 CMTS

Redundant Power Supplies The Cadant C3 CMTS supports simultaneous powering from AC or DCusing one or two power supplies. If two power supplies are installed, theload is shared between both. In this configuration, one power supply may

fail without impacting system operations. The CMTS has separate connec-tions for AC and DC power.

Up-Converter The Cadant C3 CMTS incorporates a state-of-the-art up-converter for thedownstream signal. The signal may be output in either the DOCSIS (6 MHzwideAnnex B) or EuroDOCSIS (8 MHz wideAnnex A) formats. The inte-

Table 2-4: Rear panel ports

Port Interface

FE1 10/100/1000Base-T interface

FE0 10/100/1000Base-T interface

AC power Input receptacle for 90 to 264 volts AC

DC power Input receptacle for 40 to 60 volt DC

RS232 RS-232 serial port for initial setup (38400/N/8/1)

Alarm Reserved for future use.

RX0 Upstream #1 (cable upstream 0)






Downstream Downstream output from upconverter

TST CLK OUT10.24 MHz sync clock output. (DOCSIS 2.x C3 CMTSonly) This port is off by default and not required fornormal operation.

Downstream IFOutput

Intermediate frequency (IF) output (43.75 MHz for NADOCSIS; 36.125 MHz for EuroDOCSIS) which may berouted to an external upconverter.


35/742

C3 CMTS User Guide


grated up-converter can generate the full DOCSIS/EuroDOCSIS powerrange across the entire frequency. The up-converter is frequency agile.Either the command line interface or SNMP can be used to tune the upcon-verter and configure it for DOCSIS or EuroDOCSIS operation.

The CMTS is capable of using various frequency plans, including NorthAmerican Standard, IRC, HRC, Japanese, European PAL, and EuropeanSECAM. For more information on supported channel plans, see AppendixB. The C3 CMTS can operate at any frequency (in 62.5 KHz steps) withinthe band.

Wideband Digital Receiver The CMTS incorporates a wideband digital receiver for each upstreamchannel. The digital receiver section allows spectrum analysis as well asadvanced digital signal processing to remove noise (including ingress) anddeliver the highest possible performance.

Media Access Control (MAC)

Chip

The MAC chip implements media access control (MAC) protocol and

handles MPEG frames. It also supports Direct Memory Access (DMA) forhigh data transfer performance.

Ethernet Interfaces The CMTS has two Ethernet interfaces, each which is capable of operatingat 10, 100, or 1000 megabits per second. The ports are capable of bothhalf-duplex and full-duplex operation and automatically negotiate to theappropriate setting. One port may be dedicated to data while the otherport may be used for out-of-band management of the C3 CMTS and(optionally) cable modems.

Management Schemes The CMTS management mode determines how traffic is assigned to theEthernet ports, and may be selected through the C3 CMTS configuration.For example:

C3 CMTS management traffic can be restricted to one Ethernet port,and all subscriber traffic restricted to the other Ethernet port.

Cable modem traffic can be directed to either Ethernet port asrequired.

CPU The CMTS is built around dual, state-of-the art, reduced instruction set(RISC) processors. One processor is dedicated to data handling while theother processor performs control functions including SNMP.

Flash Disk The C3 CMTS uses a Compact Flash card to store operating software andconfiguration files. The disk may be removed without affecting normaloperation; however, the C3 CMTS disables all configuration-related CLI

and SNMP functions until you replace the disk.


36/742


2 Getting Started


37/742


Topics Page

3

CMTS Installation

Planning the Installation 1

Network Requirements 1

Power Requirements 2

Earthing 2

Cable Requirements 4

Cable Plant Requirements 5

Unpacking the CMTS 6

Mounting the CMTS 7

Initial Configuration 10

Use this chapter to install the Cadant C3 CMTS.

Planning the Installation

Network Requirements The CMTS may be connected to your network using one or both Ethernet

interfaces. If it is desired to keep subscriber data traffic physically separatefrom management traffic, then both ethernet interfaces must be used.Alternatively, data and management traffic can be sent on different VLANSvia a single Ethernet interface. Regardless of the connection methodselected, at least one network connection is required to the CMTS.


38/742


3 CMTS Installation

Power Requirements To assure high system reliability, the C3 CMTS chassis supports two hot-swappable, load-sharing power supply modules. A single supply canprovide all the power that a fully loaded system needs with sufficientsafety margin.

Each type of power supply has a separate power connector mounted onthe rear panel of the C3 CMTS chassis. The power connectors are typicallyplugged into the AC power or DC power distribution unit of the rack orcabinet using the power cords supplied with the C3 CMTS.

NOTEMake sure that the power circuits have sufficient capacity to power the C3CMTS before connecting power.

To disconnect power from the C3 CMTS for servicing, remove both powerleads (AC and DC) from the rear socket. The C3 CMTS has no power

switch.

Earthing Reliable earthing of rack mounted equipment should be maintained. SeeSafety, page 1-4, for common safety considerations. Also consider usingpower strips instead of direct connections to branch circuits.

When using only DC power, earth the C3 CMTS chassis using the suppliedM4 stud.

Figure 3-1: Earthing using only DC power

Use an M4 nut and M4 lock washers with the parts stacked as shown inthe example figure below.

AC - 110VDC


39/742

C3 CMTS User Guide


If using DC power, then the Earthing conductor on the DC power cablemay be secured under either the top nut or the bottom nut.

Figure 3-2: Example positioning of the M4 nut and lock washers

AC powering The AC power modules require 100 to 240 volt, 2A, 47 to 63 Hz AC power.The socket-outlet must be properly earthed.

DC powering The DC power modules requires 40 to 60 V DC, 4A power from a SELVrated source. The DC power source must have an over current protectiondevice rated at 10 Amp.

The external DC cable assembly must not be modified in the field; routeany excess length to avoid snags.

Connect both Feed 1 and Feed 2 to the DC power source even if only oneDC power supply is to be installed. This allows placing a single DC powersupply in either of the two possible locations, or placing two DC powersupplies in the chassis.

Lockwasher

Chassis

Ground

Metal

Lockwasher

DC Feed

Ground


40/742


3 CMTS Installation

The following diagram shows the connector and pin locations.

Figure 3-3: Connector and pin locations

Cable Requirements A variety of cables and connectors and the tools to work with them mustbe obtained to complete the installation.

NOTEUse only RG-59 coaxial cable with DOCSIS 1.1 cards. RG-6 cable is notsuitable for use with the connectors on these cards, but may be used withDOCSIS 2.0 cards.

Signal To AWG ColorDC Return Pin 1 18 Black

-40 to -60V Feed 1 Pin 2 18 Red

-40 to -60V Feed 2 Pin 3 18 White

DC RETURN BLACK-40 to -60V FEED 2 (RED)

-40 to -60V FEED 2 (WHITE)

1

2

3

Table 3-1: Cable and connector types

Cable Wire TypeConnector

Type

Serial console(included with C3CMTS)

9 pin RS-232 serial cable DB-9M

Ethernet connectionsCategory 3, 4, 5, or 5E twistedpair cable

RJ-45

CATVRG-59 coaxial cable (all)RG-6 (DOCSIS 2.0 cards only)

F


41/742

C3 CMTS User Guide


Ethernet Connections The C3 CMTS provides two 10/100/1000BaseT Ethernet ports to allowconnection to a terminating router, server, or other networking devicessuch as a hub, switch, or bridge.

Both Ethernet connectors are standard RJ-45 connectors. For 10BaseT and100BaseT, unshielded cable may be used. For 1000BaseT, use shieldedcategory 5E wire.

Cable Plant Requirements The RF cable plant should be designed so that all RF ports connect to SELVcircuits (meeting the requirements of SELV as defined in UL60950). Youmust provide suitable protection between these ports and the CATVoutside plant.

Table 3-2: Downstream RF cable plant requirements

Parameter Value

Frequency Range88 to 858 MHz (DOCSIS)

112 to 858 MHz (EuroDOCSIS)Carrier-to-Nose ratio at theRF input to the cable modem

30 dB

Channel bandwidth6 MHz (DOCSIS)

8 MHz (EuroDOCSIS)

Table 3-3: Upstream RF cable plant requirements

Parameter Value

Frequency Range*

5 to 42 MHz (DOCSIS)

5 to 55 MHz (Japan)

5 to 65 MHz (EuroDOCSIS

Carrier-to-noise ratio at theRF input to the C3 CMTS

At least 10 dB

Channel Bandwidth200 KHz, 400 KHz, 800 KHz, 1600 KHz,3200 KHz, 6400 KHz


42/742


43/742


44/742


45/742

C3 CMTS User Guide


4 (optional) Connect an Ethernet cable between the FE1 port and thenetwork manager.

5 Connect an Ethernet cable between the FE0 port and the network bridgeor router.

6 Make the power connection as follows:

If using AC power, connect the power cord to the input socket in theupper right (above the fuses).

If using DC power, connect the supplied DC power cable to the smallwhite connector to the immediate left of the AC input connector.

NOTEWhen DC powering, the chassis should be earthed to the rack using thesupplied M4 earthing stud as detailed in Earthing, page 3-2.

7 Apply power to the CMTS.

The cooling fans should start to turn, and the CMTS should display initialstartup messages on the LCD screen on the front panel. The followingfigure shows the location of the LCD.

End of procedure

Figure 3-6: LCD location

3 Transmit Data (TD)

4 Data Terminal Ready (DTR)

5 Ground (GND)

6 Data Set Ready (DSR)

7 Request to Send (RTS)

8 Clear to Send (CTS)

9 Unused

Pin Signal

LCDFANS

RX0RX

1RX

2RX

3RX

4RX

5FE

0AUX

FE1

UPCON

PSU2

PSU1

STATUS

LCD


46/742


3 CMTS Installation

Initial Configuration The following sequence can be used to start up the ARRIS Cadant C3CMTS. This startup sequence assumes an out of the box initial condition.

Prerequisites The following items must be set up before configuring the CMTS:

An external DHCP server must be running.

An external TFTP server must contain the cable modem configurationfile specified by the DHCP server.

Optional Items The following items are optional for the initial configuration, but may berequired for normal operation:

A ToD server is available for the cable modem.

An NTP server is available for the CMTS.

A Syslog server is available.

Initial Boot Parameters Required boot parameters depend on how the C3 CMTS loads its software

image.

The choice of the booting interface (fe0/0or fe0/1) also pre-definescertain bridging behavior of the CMTS. You can reconfigure this behavior,but from a factory default condition before the system loads its code forthe first time (or no startup-configuration on the compact flash disk):

Selecting fe0/0configures in-band behavior. All cable modem andCPE traffic is directed to fe0/0; you can use either Ethernet port formanaging the CMTS.

Selecting fe0/1configures out-of-band behavior. All CPE traffic isdirected to fe0/0. All cable modem traffic is directed to fe0/1. You can

use either Ethernet port for managing the CMTS if management-access is specified in the interface configuration.

Table 3-4: Required boot parameters

If the softwareimage is on Required boot parameters are

the C3 CMTS flashdisk

none

an external TFTPserver

booting interface (see below)

initial IP address of the booting interface

default gateway IP address to the TFTP server

the 802.1Q VLAN ID if booting over an 802.1QVLAN encoded backbone is required


47/742

C3 CMTS User Guide


Factory Default NetworkSettings

Factory default network settings are:

IP address is one of:

- 10.1.127.120

- 10.1.127.121- 10.1.127.122

- 10.1.127.123

Subnet mask: 255.255.128.0

Gateway address:10.1.0.3

SeeAppendix G, Factory Defaultsfor a complete list of factory defaultsettings.

Rear Panel Connectors Refer to the following diagram when performing this procedure.

Figure 3-7: Rear panel connectors

Perform the following tasks in the order shown.

Preparing the Connections, page 3-11

Verifying Proper Startup, page 3-12

Setting Boot Parameters, page 3-13

Configuring an Initial CLI Account, page 3-16

Procedure 3-4 Preparing the Connections

1 Connect the appropriate AC or DC power cables to the CMTS. Do notpower up yet.

2 Connect the RS232 serial cable to the serial port and connect the other end

to a terminal (or PC with a terminal emulation program).

AC power

DC power

Serial

-

FE0
http://-/?-http://-/?-http://-/?-


48/742


3 CMTS Installation

3 Start the console application and set the console configuration to:

Port: Com1/Com2, depending on your connection

Baud rate: 38400

Data: 8 bits Parity: None

Stop bit: 1

Flow control: None

End of procedure

Procedure 3-5 Verifying Proper Startup

Follow these steps to start the C3 CMTS for the first time.

1 Power on the CMTS and verify that the following status LEDs on the frontpanel are illuminated green:

FANS

PSU1

PSU2 (if second power supply is installed)

Status

2 Verify that the FE0 and FE1 ports on the back of the CMTS have illuminatedgreen Link LEDs (for the port that is being used).

3 Wait for the message Press any key to stop auto-boot... to appear on the

console, then press any key to stop auto booting before the count reaches0.

NOTEAuto booting continues after two seconds.

4 At prompt, type helpor ?and press Enterto view the differentcommands available for boot options.

The first commands you see are user level commands.

CMTS>?

----------------------------------------------------------------

Command Description----------------------------------------------------------------

boot Boot the CMTS using current boot parameters

bootShow Display current boot parameters

enable Enable Supervisor/Factory Level

sysShow Show system configuration

timeShow Displays current Date and Time from RTC


49/742

C3 CMTS User Guide


dir Show directory of Compact Flash

vlevel Set Verbosity Level

reboot Reboot

help Display general help or help about a command

? Display general help or help about a command

@ Boot the CMTS using current boot parameters>

End of procedure

Procedure 3-6 Setting Boot Parameters

1 Enter privileged mode using the enablecommand to change the bootparameters. The first time you enter this mode, there is no password setand you can enter with no password. Use the setpwdcommand if a

password is required in the future.Several more commands are now available. Type ?to see the entire list.

>enable

No supervisor level password set yet

Use "setpwd" command to set password

Supervisor level enabled

>?

----------------------------------------------------------------

Command Description

----------------------------------------------------------------

boot Boot the CMTS using current boot parameters

bootShow Display current boot parameters

bootCfg Configure the boot parameters

cf Select Compact Flash for booting

tftp Select TFTP for bootingwan Select FA0/0(WAN) port for network access

mgmt Select FA0/1(MGMT) port for network access

enable Enable Supervisor/Factory Level

disable Disable Supervisor/Factory Level

sysShow Show system configuration

setTime Set time in RTC

setDate Set Date in RTC

timeShow Displays current Date and Time from RTC

dir Show direcory of Compact Flash

setpwd Set password

vlevel Set Verbosity Level

setVlanId Set the VLAN tag to be used

vlanEnable Enable VLAN tagging/stripping as set by setVlanId

vlanDisable Disable VLAN tagging/stripping

reboot Reboothelp Display general help or help about a command

? Display general help or help about a command

@ Boot the CMTS using current boot parameters

>


50/742


51/742


52/742


53/742


54/742


3 CMTS Installation

Configuring IP Networking The C3 CMTS applies the CMTS IP address configured in the boot param-eters to the fastethernet interface selected as the boot interface, and tothe cable interface when booting from the default configuration (or whenno startup-configuration file is available). If these settings are not suitable,

use this procedure to specify the IP address information required fornormal C3 CMTS operation.

You should also specify at least one fastethernet sub-interface to be avail-able for system management; see management-access, page 11-235, fordetails.

Configuration Options The C3 CMTS supports two configuration options:

bridging (no IP routing) modesee Chapter 4, Bridge Operation

IP routing modesee Chapter 6, IP Routing

Default Bridge Groups Depending on the boot interface you chose in Setting Boot Parameters,

page 3-13, the C3 CMTS pre-configures two bridge groups.

Action Perform one of the following tasks:

Configuring Bridging Mode, page 3-18

Configuring IP Routing Mode, page 3-19

Procedure 3-9 Configuring Bridging Mode

Follow these steps to configure a different default route.

1 Log into the CMTS.2 Enter one of the following groups of commands:

a To assign the management IP address to the fastethernet 0/0.0(FE0/0) primary sub-interface, enter the following commands:

C3# config terminal

C3(config)# interface fastethernet 0/0

C3(config-if)# ip address {mgmt-ip-addr} {mask}

C3(config-if)# exit

C3(config)# exit

C3# write


55/742


56/742


3 CMTS Installation

c True IP routing, removing bridge-group memberships:

C3# config terminal

C3(config)# ip routing

C3(config)# interface fastethernet 0/0.0

C3(config-if)# no bridge-group

C3(config-if)# interface cable 1/0.0


C3(config-if)# interface fastethernet 0/1.0


C3(config-if)# interface cable 1/0.1


C3(config-if)# exit

C3(config)# exit

2 Set the IP address of the cable interface:

C3(config)# interface cable 1/0.0

C3(config-if)# ip address {cbl_ip} {subnet}

The cbl_ipaddress may not be in the same subnet as the managementIP address.

3 Configure the DHCP relay (this is required for a cable modem to register

when the CMTS is in IP routing mode):C3(config-if)# ip dhcp relay

4 Cable helper address is mandatory for IP routing cable sub-interfaces thatare running DHCP relay.

C3(interface)# cable helper-address {ipaddr}

C3(interface)# exit

5 Enter the following commands to save the routing configuration:

C3(config)# exit

C3# write

End of procedure


57/742


58/742


59/742

C3 CMTS User Guide


NOTEAll channel types for a particular channel must match the modulationprofile selected for that channel. If any channel type does not match themodulation profile, the C3 CMTS disables that channel until you correcteither the channel type or modulation profile.

3 Set the physical upstream channel width (in Hz) using the followingcommand:

C3(config-if)# cable upstream {X or X.Y physical orphysical.logical} channel-width {width}

The channel width specified must be a DOCSIS-standard upstreamchannel width.

ATDMA: 6400000(6.4 MHz)

ATDMA and TDMA: 3200000(3.2 MHz), 1600000(1.6 MHz), 800000(800 KHz), 400000(400 KHz), or 200000(200 KHz).

SCDMA: 1600000(1.6 MHz), 3200000(3.2 MHz), or 6400000(6.4 MHz).

Example: cable upstream 2 channel-width 3200000

4 Set the physical upstream channel frequency (in Hz) using the followingcommand:

C3(config-if)# cable upstream {X or X.Y physical orphysical.logical} frequency {freq}

The valid frequency range is 5000000(5 MHz) to 42000000(42 MHz)

for North American DOCSIS, and 5000000(5 MHz) to 65000000(65 MHz) for EuroDOCSIS.

Example: cable upstream 2 frequency 25000000

5 Assign the modulation profile to an upstream using the followingcommand:

C3(config-if)# cable upstream {X or X.Y physical orphysical.logical} modulation-profile {n}

Where nis a modulation profile index, 0to 5.

The factory default modulation profile for each upstream is profile 1. Thisprofile uses QPSK and is the safest profile to use to get modems online.

6 Set the input power level (the target receive power set during the DOCSISranging process) using the following command:

C3(config-if)# cable upstream {X or X.Y physical orphysical.logical} power level {power}


60/742


3 CMTS Installation

The valid power range depends on the channel width; the range -4to 14is valid for all channel widths. See cable upstream power-level,page 11-301for individual ranges.

Example:cable upstream 2 power level 0

7 Repeat steps 2 through 5 for each upstream that you need to configure.

Proceed to Enabling the Interfaces, page 3-24.

End of procedure

Procedure 3-13 Enabling the Interfaces

Follow these steps to enable the cable interfaces.

1 Enable an upstream cable interface using the following commands:

For physical interfaces:no cable upstream [X or X.Y physical orphysical.logical] shutdown

For logical interfaces: no cable upstream [X or X.Y physical orphysical.logical] shutdown

Repeat this command for each configured upstream or logical channel.

2 Enable the downstream cable interface using the following command:

C3(config-if)# no shutdown

The CMTS is now ready to acquire and register cable modems. To displaythe current CMTS configuration, use the show running-config

command.

End of procedure


61/742


Topics Page

4

Bridge Operation

Bridging Features 3

Bridge Concepts 4

Bridge Binding 14

IP Addressing 16

Attaching Bridge Groups 18

Incoming Traffic Allocation to a Sub-Interface 19

The C3 CMTS supports IP bridging and routing modes of operation. Thischapter describes bridging mode.

For more information, see:

Chapter 5, Providing Multiple ISP Accessfor information about usingbridge groups to separate traffic and provide cable modem access tomultiple ISPs.

Chapter 6, IP Routingfor information about the C3 CMTSs optional IProuting mode.


62/742


4 Bridge Operation

Terms and Abbreviations

The following are terms and abbreviations used in this chapter.

booting interface The Fast Ethernet interface specified in the bootoptions. Use the wancommand to specify fastethernet 0/0, or mgmttospecify fastethernet 0/1.

bridge binding Bridge binding maps a sub-interfaceAwith VLAN tagato a sub-interface Bwith VLAN tag b; packets with tag aarriving on sub-interfaceAare immediately bridged to sub-interface Bwith tag b, and vice-versa. No other layer 2 bridging rules are followed.

bridge group A group of sub-interfaces that may forward (bridge)packets to other sub-interfaces in the group. There is no interactionbetween bridge groups at the MAC level.

default cm subinterface A designated sub-interface used for cable

modem traffic until the cable modem receives an IP address from a DHCPserver.

default cpe sub-interface A designated sub-interface, used as asource sub-interface for CPE traffic when it has no VLAN tag or otherexplicit mapping (using the map-cpescommand or VSE method).

native tagging Cisco routing nomenclature; sub-interfaces usingnative tagging do not actually tag packets transmitted from that sub-inter-face, but the tag number is still associated with the sub-interface forinternal processing purposes.

routing sub-interface A sub-interface that supports layer 3 routing.The default sub-interface behavior is layer 2 bridging.

sub-interface A logical subdivision of a physical interface. The C3CMTS supports up to 250 sub-interfaces per physical interface.

VLAN tag The VLAN ID, used to associate a cable modem or CPE witha sub-interface. The tag can be specified either in 802.1Q VLAN encapsu-lated packets; or in native mode, in the cable modems VSE.

VSE Abbreviation for Vendor-Specific Encoding. The VSE is a TLV,stored in the cable modem configuration file, that specifies the VLAN IDused to associate the cable modems CPE with a sub-interface. Duringmodem registration, this information is passed to the CMTS allowing theCMTS to map traffic through the modem to a nominated cable subinterfacewith a matching native VLAN tag.


63/742

C3 CMTS User Guide


Bridging Features

The factory default operating mode of the C3 CMTS is bridging mode.

In general, normal bridging operation should not be assumed.

In no configuration does bridging occur between the two Fast Ethernetinterfaces.

Bridging between the FastEthernet interfaces and the cable interfacesis controlled by:

- the selection of the boot option network interface when nostartup-configuration file exists

- the selection of the boot option network interface when upgradingfrom release 2.0 to release 4.0 software

- an existing startup-configuration file; the configuration overridesthe boot options

IP forwarding occurs even though the C3 CMTS is running in bridging

mode. IP forwarding between bridge groups is turned off by default for secu-

rity reasons.

IP forwarding between bridge groups (IP traffic allowed to leave abridge group) may be turned on using the command ip l2-bg-to-bg-routingin the interface specification of any interface attached to thebridge group.

Static routes may be defined using the ip routecommand for:

- C3 CMTS management traffic

- the DHCP relay agent

- IP forwarding between bridge groups (using ip l2-bg-to-bg-

routing)

NOTEIn bridging mode, other cable modem and CPE traffic should be bridgedand static routes should notbe used.

NOTEDefine a default gateway for the C3 CMTS using the command ipdefault-gateway, page 11-175from the CLI. A default gateway has thesame purposes and restrictions as a static route.


64/742


4 Bridge Operation

Bridge Concepts

Bridge Groups Bridge groups provide the ability to operate self contained and separateMAC domains in one physical device.

A bridge group is defined as a group of interfaces attached to a layer 2bridge or a common broadcast domain.

Figure 4-1: Example of a bridge group

When the C3 CMTS runs in bridging mode, there is no interaction betweenbridge groups at the MAC level or layer 2 levelwhether by ARP or anyother protocol.

The problem with this concept is that although there are two physicalFastEthernet interfaces, allowing each to be assigned to a separate bridgegroup, there is only one physical cable interface. This issue is solved by theuse of sub-interfaces.

fastethernet 0/1.0bridge-group 0

cablebridge-group 0

cable bridge-group 1


PC

BACKBONE

bridge 1

bridge 0BACKBONE

PC


65/742

C3 CMTS User Guide


Sub-Interfaces Sub-interfaces split a physical interface into multiple logical interfaces toallow more flexibility in creating bridge groups. This allows each sub-inter-face to have different specifications for:

bridge group membership

IP addressing

DHCP relay address provided to the DHCP server

DHCP relay mode and helper address

IP routing e.g. for RIP

IGMP

Filtering using both ACL and subscriber management

C3 CMTS management access

802.1Q tagging

other layer 3 parameters

A sub-interface is specified using a dot notation as follows:

Cable 1/0.2 is a sub-interface of the physical interface cable 1/0.

Similarly FastEthernet 0/1.5 is a sub-interface of the FastEthernet 0/1physical interface.

Figure 4-2: Example of a sub-interface to access different bridgegroups


cable 1/0.0 bridge-group 0 default cm subinterface cable 1/0.0

cable 1/0.1 bridge-group 1 default cpe subinterface cable 1/0.1


Cable Operator

DHCP/TFTP/ToD

Modem

PC

BACKBONE

bridge 1

bridge 0


66/742


4 Bridge Operation

The C3 CMTS allows one sub-interface to be defined that is not a memberof any defined bridge group. This interface is marked as ManagementAccess Only in the show interface outputand as the descriptionsuggests, this interface can only be used to manage the CMTS.

Figure 4-3: Example of a Management Access Only interface

The big issue with sub-interfaces is the decision making process of howtraffic is mapped from the physical interface to a sub-interface for these

different specifications to have an effect. This issue is discussed later inthis chapter.

Bridge Operation The factory default mode of operation of the C3 CMTS is bridging mode.In this mode, the C3 CMTS has two bridge groups. Without the use of thekeyed bridge-group licensing feature, each of the two factory definedbridge groups can support a maximum of 2 sub-interfaces; only one maybe a cable sub-interface. Without the bridge group license, up to themaximum of 250 subinterfaces may be created and used in static iprouting mode but they cannot be connected to a bridge group if the limitof two subinterfaces per bridge group is exceeded. Once the bridge-grouplicense is purchased, up to 10 sub-interfaces per bridge group and up to254 bridge groups is allowed.

The Additional VLAN/Bridge Group License (Product ID 713869) extendsthe limits to 254 bridge groups, each of which supports up to 10 sub-inter-faces with no restriction on the number of cable sub-interfaces. Contact

Modem

PC

cable 1/0.0

bridge-group 0 default cpe interface cable 1/0.0 default cm interface cable 1/0.0

fastethernet 0/0.0 bridge-group 0

fastethernet 0/1.0

bridge 0

Management

BACKBONE


67/742

C3 CMTS User Guide


your ARRIS representative for ordering information and other details. Seethe next chapter for more details about advanced bridging, even if you arenot purchasing this license.

Figure 4-4: Illustration of the default bridge configuration

For more information, see:

the CLI commands ip default-gatewayand ip routefor their rele-vance in bridging mode

Appendix B, for sample bridging network configurations.

Selecting the Bridge GroupConfiguration

The above bridge group configurations may be changed:

from the boot options using the wanor mgmtcommand to select thenetwork interfaces labeled FE0/0 and FE0/1 respectively before astartup-configuration file is created on first power up. This can occurby deleting the existing startup-configuration file (using the writeerasecommand) then power cycling, or the first time the C3 CMTS ispowered up. In either case a default startup-configuration will becreated based on the selected boot options network interface.

by specification from the CLI after the Cadant C3 CMTS has been

booted (with this configuration subsequently saved to the startup-configuration)

BACKBONE

fastethernet 0/0

bridge-group 0

cable 1/0

bridge-group 0

default cpe subinterface cable 1/0.0

default cm subinterface cable 1/0.0

PC

Modem

cable 1/0.1

bridge-group 1

shutdown

fastethernet 0/1

bridge-group 1

shutdown

bridge 1

bridge 0


68/742


4 Bridge Operation

Fast Ethernet 0/0 as theBoot Options NetworkInterface

This is the factory default mode of operation of the C3 CMTS.

In this mode, the C3 CMTS:

pre-assigns interface fastethernet 0/0.0 to bridge group 0

pre-assigns interface cable 1/0.0 to bridge group 0

pre-assigns interface fastethernet 0/1.0 to bridge group 1, and shutsdown the interface

pre-assigns cable 1/0.1 to bridge group 1, and shuts down the inter-face

sets default cm subinterface cable 1/0.0

sets default cpe subinterface cable 1/0.0

carries the boot option specified IP address forward into a factorydefault configuration as the fastethernet 0/0 IP address, and alsoapplies this IP address to the cable 1/0.0 sub-interface (this defaultconfiguration can be overwritten from the CLI).

Figure 4-5: Illustration of the factory default configuration

NOTEAll the above settings may be changed at the CLI. For example, you canoverride the management IP address by a running-configuration

BACKBONE

fastethernet 0/0

no shutdown

boot IP address

bridge-group 0

cable 1/0 bridge-group 0

default cpe subinterface cable 1/0.0

default cm subinterface cable 1/0.0

PC

Modem

cable 1/0.1

bridge-group 1

shutdown

fastethernet 0/1

bridge-group 1

shutdown

bridge 1

bridge 0


69/742


70/742


4 Bridge Operation

shutdown

!

interface cable 1/0.0

bridge-group 0no shutdown

no cable upstream 0 shutdown

no cable upstream 0.0 shutdown

ip address 10.99.99.253 255.255.255.0

ip address 10.99.98.253 255.255.255.0 secondary

!

! Update giaddr with 10.99.99.253 for cable-modem

! update giaddr with 10.99.98.253 for host

ip dhcp relay

no ip dhcp relay information option

cable dhcp-giaddr policy

! unicast ALL dhcp to 10.99.99.1

cable helper-address 10.99.99.1exit

!

interface cable 1/0.1

bridge-group 1

shutdown

!

! nothing to do here in this case

exit

exit

Fast Ethernet 0/1 as theBoot Options Network

Interface

Selecting the fastethernet 0/1 interface as the boot options network inter-face, when there is no existing startup-configuration file, pre-assigns the

bridge groups to force all cable modem traffic to the fastethernet 0/1 inter-face, and all CPE traffic to the fastethernet 0/0 interface. This results inout of band operation of the C3 CMTS.

Selecting fastethernet 0/1 as the booting interface:


pre-assigns interface cable 1/0.0 to bridge group 0


pre-assigns cable 1/0.1 to bridge group 1

sets default cm subinterface cable 1/0

sets default cpe subinterface cable 1/0.1

carries the boot option specified IP address forward into a factorydefault configuration as the fastethernet 0/1 IP address.

Again, all the above settings may be changed at the CLI.


71/742

C3 CMTS User Guide


The following diagram shows data flow in the C3 CMTS when fastethernet0/1 is the boot interface.

Figure 4-7: Data flow when FastEthernet 0/1 is the boot interface

In this example, DHCP relay must be turned on in the cable 1/0.1 sub-interface specification if CPE DHCP is to be served by a DHCP server on thefastethernet 0/1 sub-interface (MGMT port).

In addition, ip l2-bg-to-bg-routingmust be enabled on the fastethernet

0/1.0 sub-interface for the CPE DHCP Renew to succeed. The DHCP Relayfunction relays the Renew from cable 1/0.1 to the fastethernet 0/1.0 sub-interface. The DHCP Renew ACK received at the fastethernet 0/1.0 sub-interface must be routed across bridge groups to cable 1/0.1; and the ACKfunction is not destined for cable 1/0.1 but it is destined for the CPE. Sincethe ACK is not relayed by the DHCP Relay function and must be routed bythe C3 CMTS, the fastethernet 0/1.0 must have ip l2-bg-to-bg-routingactivated.

For more information, see the network examples in Appendix B.

Decide what is ManagementTraffic

Software releases prior to v3.0 locked the user into accepting cablemodem traffic as management traffic.

This software release allows the user to decide what is managementtraffic:

CMTS traffic only, or

CMTS and cable modem traffic


72/742


4 Bridge Operation

By defining the default cable sub-interface for modem traffic to bedifferent than the default for CPE traffic, modem traffic can be removedfrom the bridge group that contains the CPE traffic. This requires that themodem DHCP, TFTP, and ToD servers be present on the fastethernet 0/1

interface as in the following example.

The following diagram shows the default, version 2.0-compatible, oper-ating mode. CMTS management traffic and cable modem traffic sharebridge group 0.

Figure 4-8: Default, V2.0 compatible, operating mode


73/742

C3 CMTS User Guide


The following diagram shows bridge group 0 restricted to carrying CMTSmanagement traffic, and bridge group 1 used for all cable modem and CPEtraffic.

Figure 4-9: Example of Bridge group 0

The following diagram shows bridge group 0 unused, and bridge group 1used for all cable modem traffic. CMTS management traffic is restricted toa management-only sub-interface. This sub-interface is configured withthe CMTS IP address and has management accessenabled.

Figure 4-10: Example of Bridge group 1

Modem

PC

CMTSManagement

Only

Backbone

cable 1/0.0bridge-group 0

cable 1/0.1bridge-group

default cpe subinterface cable 1/0.1 default cm subinterface cable 1/0.1

bridge-group 1

fastethernet 0/1.0no bridge group

Cable Operator

DHCP/TFTP/TOD

bridge 1

bridge 0

Modem

PC

CMTSManagement

Only

Backbone

cable 1/0.0bridge-group 0

cable 1/0.1bridge-group

default cpe subinterface cable 1/0.1 default cm subinterface cable 1/0.1

bridge-group 1

fastethernet 0/1.0no bridge group

Cable Operator

DHCP/TFTP/TOD

bridge 1

bridge 0


74/742


4 Bridge Operation

The final example shows CMTS management traffic on a management-only sub-interface, as before, and cable modem traffic and CPE traffic onseparate bridge groups.

Figure 4-11: Example of CMTS management traffic

Bridge Binding

Bridge binding provides a direct link between a tagged cable sub-interface

and a tagged FastE

Documents

Cadant C3 CMTS User Documentation(Release 4.4 Standard, October 2006) (2)