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Cisco Building Broadband Service Manager

BBSM 5.2 Cable Hardware Configuration Guide

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Document ID: 28644


Contents

Introduction
Prerequisites
      Requirements
      Components Used
      Conventions
Security
VPN Issues
Parameter Definitions
      About CMTS Configuration
Configuring the Cisco 2600 Router
      Entering Configuration Mode
      Configuring the NAT When You Use Private IPs on BBSM Networks
      Route to the Internet
      Route to the Internal BBSM Network
      Configure the SNMP Engine
      Configure the Access List for Security Control
      Configure the Serial Interface
      Configure the Ethernet Interface
      Configure the Telnet Interface
      Common Oversights and Mistakes
Configuring BBSM
      Configuration
      Common Oversights and Mistakes
Configure the 3500 XL Switch—Base Switch Configuration
      Enter Configuration Mode
      Global Configuration
      Configure the Access List for Security Control
      Configure the FastEthernet0/1 - 0/23 Interface
      Configure the FastEthernet0/1 - 0/24 Interface Storm Control (Optional)
      Configure the VLAN 1 Interface
      Configure the Telnet Interface
      Common Oversights and Mistakes
uBR7100 Cable Modem Termination System—IRB Configuration
      Enter Configuration Mode
      Global Configuration
      Configure the Access List for Security Control
      Configure the FastEthernet0/0 Interface
      Configure the FastEthernet0/1 Interface
      Configure the Cable1/0 Interface
      Configure the Bridgegroup Virtual Interface 1 Interface
      Configure the Telnet Interface
      Common Oversights and Mistakes
uBR7100 Cable Modem Termination System – Bridge Configuration
      Enter Configuration Mode
      Global Configuration
      Configure the Access List for Security Control
      Configure the FastEthernet0/0 Interface
      Configure the FastEthernet0/1 Interface
      Configure the Cable1/0 Interface
      Configure the Telnet Interface
      Common Oversights and Mistakes
uBR7x00 Cable Modem Termination System – Routed Configuration
      Enter Configuration Mode
      Global Configuration
      Configure the Access List for Security Control
      Configure the FastEthernet0/0 Interface
      Configure the FastEthernet0/1 Interface
      Configure the Cable1/0 Interface
      Configure the Telnet Interface
      Common Oversights and Mistakes
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Related Information

Introduction

This document outlines best practice methods for Cisco MxU Broadband Solution Deployment. In order to provide broadband connectivity for the MxU market, the Building Broadband Solution Unit (BBSU) Total Implementation Package (TIP) uses:

  • Cisco Systems, Inc. Building Broadband Service Manager (BBSM)

  • Ethernet

  • Long Reach Ethernet (LRE)

  • Aironet

  • Cable Product offerings

This document is a supplemental tool that is intended for use by Cisco partners, resellers, and customers for the deployment of Cisco products. This tool is subject to the terms and conditions of the Cisco TIP License Agreement.

This document provides baseline configuration guidelines for a Cisco Systems BBSM Network within a coaxial cable plant. This document does not replace individual Point Product Configuration documentation.

Prerequisites

Requirements

Readers of this document should have knowledge of these topics:

  • BBSM network design

  • The BBSM Internet Protocol (IP) scheme for the property (BBSM-to-router, BBSM-to-client)

  • The external IP scheme from the Internet service provider (ISP), including a Domain Name System (DNS) forwarder and a Simple Mail Transfer Protocol (SMTP) forwarder

  • Internal network design; for example, the IP addresses of all of the switches and application processes (APs)

Components Used

The information in this document is based on BBSM 5.2.

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Conventions

For more information on document conventions, refer to the Cisco Technical Tips Conventions.

Security

The configurations that are contained in this document are provided as a sample and might require modifications for use in your network. Access lists are provided in these sections of the document:

They are examples of how to prevent unauthorized access to routers and switches. These security measures are not comprehensive and you must modify them as required for each individual network. You must test any additions or modifications to access lists and other configuration items prior to inclusion into a production network environment.

It is the responsibility of the network administrator to analyze all security risks and respond to security issues for the BBSM network. Cisco assumes no responsibility for damage done by unauthorized personnel that access network equipment.

VPN Issues

BBSM supports all Virtual Private Network (VPN) solutions, once a customer is connected to the BBSM service. You may experience problems depending on the IP scheme of the BBSM internal network. Some VPNs do not support Network Address Translation (NAT) or Port Address Translation (PAT). NAT or PAT must occur when you are using a private or non-routable IP scheme (for example, 10.10.0.0). Translation of a private address to a public, routable address occurs on the router and is what actually causes some VPN solutions not to work. The Cisco VPN 3000 Concentrator, for example, is a system that can support VPN over NAT.

To ensure that all VPNs work all of the time, the entire BBSM solution must use a routable (public) IP scheme.

Note: Even though you use routable IP addresses, customers that rely on Plug and Play to connect to BBSM with statically configured IP addresses might not be able to activate a VPN session. The reason for this is because BBSM uses a form of NAT to translate between their static IP address and an IP address from the Foreign Range.

If the customer requires a VPN connection and can not initiate one with a static IP address, then the customer must configure their computer for DHCP.

Parameter Definitions

This section defines the parameters, or variables, that you use throughout this document.

  • BBSM_External_IP_Network—The network ID of the BBSM external network

  • BBSM_Internal_IP_Network—The network ID of the BBSM internal network

  • BBSM_External_NIC—The IP address of the BBSM external network interface controller (NIC)

  • BBSM_I/E_NIC—The IP address of the internal and external NIC. Commands with this parameter should be repeated for both the internal and the external NICs

  • BBSM_Internal_NIC—The IP address of the BBSM internal NIC

  • BBSM_Network_SNM—The subnet mask of the BBSM internal network.

  • CD_Drive—The drive letter of the CD drive of the computer

  • Client_IP_Address—The IP address for the cable modem termination system (CMTS) client networks

  • Client_SNM—The subnet mask for the CMTS client networks

  • CM_Net_ID—The cable modem (CM) network ID

  • CM_Network_IP_Address—The IP address for the CMTS as a router for the cable modem network

  • CM_Network_SNM—The subnet mask for the CMTS for the cable modem network

  • DOCSIS_Config_File_Name—The file name of the Data-over-Cable Service Interface Specifications (DOCSIS) cable modem configuration file loaded on and accessible from the TFTP server

  • DS_Freq—The downstream (DS) frequency

  • DS_Mod—The downstream signal modulation

  • Gateway_to_Router—The IP address for the F0/0 interface on the CMTS (on the BBSM internal subnet)

  • IP_Addr—The destination IP address or IP network for router access list 100

  • IP_Address_1—The IP address of the router Serial0/0 interface

  • IP_Address_2—The IP address of the router Ethernet0/0 interface

  • ISP_Gateway—The gateway IP address for the router, which is received from the ISP

  • Int_Depth—The interleave depth

  • Man_Network—The integrator or corporate network that is used to monitor and to administer the network

  • Netmask—The subnet mask

  • password_1—The password that is required to enter Privileged mode

  • password_2—The password that is required to log on to the switch with Telnet

  • Private_IP_(X)—The private IP address that receives a 1:1 NAT map to a Real_IP_(X)

  • Real_IP_(X)—The real IP addresses that is obtained from the ISP

  • RO_String—The read-only SNMP community string

  • RW_String—The read-write SNMP community string

  • Switch_IP—The IP address of the switch

  • USx_Freq—The upstream (US) frequency for USx (US0, US1, US2, US3)

  • USx_Power—The upstream power level from the cable modem for USx

  • USx_Ch_Width—The upstream channel width for USx

  • Wildcard—Used with IP_Addr to determine the size of the destination network for router access list 100

About CMTS Configuration

There are three different possible configuration modes for the uBR7x00 CMTS on a network: transparent bridging, routing, or integrated routing and bridging (IRB). BBSM can support all three of these configuration modes.

The questions that arise are when to use a particular configuration mode and why to use it. Follow these guidelines when you configure a CMTS on a BBSM network:

  • Bridging—You may place the CMTS in transparent bridging mode, which provides the necessary connectivity to support statically configured clients. All modems receive an IP address from one of the client subnets that are configured on the BBSM internal network. For this configuration, you must configure the primary subnet on BBSM with all of the required cable modem DHCP scope options. Therefore, these options are also sent to all of the clients that connect to the network.

  • Routing—You may place the CMTS in routing mode, as long as you do not desire support for statically configured clients. Support for statically configured clients requires a bridged network: either transparent bridging or IRB. Cable modems are placed on their own subnet, which are separate from any client subnets. In a routed cable modem network, you may use BBSM or a separate system to provision cable modems.

  • IRB—You may place the CMTS in IRB mode, which provides support for statically configured clients and places the modems on a subnet that is separate from the client subnets. This configuration mode is most desirable, because it provides full Plug and Play support for clients and it allows the CMTS to act as a router for the cable modems.

Note: The uBR7200 series CMTS do not support bridging or IRB configuration mode. If you place a uBR7200 series CMTS in a BBSM network, you must configure it in routing mode.

Configuring the Cisco 2600 Router

Entering Configuration Mode

Issue these commands to enter configuration mode:

Router> enable

!--- Enter password, if prompted.

Router# config terminal

Router(config)# enable secret password_1 

Router(config)# hostname SJ1

!--- Use a unique hostname for each router, for easy identification.

Configuring the NAT When You Use Private IPs on BBSM Networks

Issue these commands to configure the NAT pool for BBSM end users:

SJ1(config)# ip nat pool all_clients Real_IP_2 Real_IP_3 netmask Netmask 

SJ1(config)# ip nat inside source list 1 pool all_clients overload

SJ1(config)# ip nat inside source static Private_IP_X Real_IP_X 

SJ1(config)# access-list 1 permit BBSM_Internal_IP_Network Wildcard 

SJ1(config)# access-list 1 permit BBSM_External_IP_Network Wildcard

Route to the Internet

Issue this command to route to the Internet:

SJ1(config)# ip route 0.0.0.0 0.0.0.0 ISP_Gateway

Route to the Internal BBSM Network

Issue this command to route to the BBSM internal network:

SJ1(config)# ip route BBSM_Internal_IP_Network Netmask BBSM_External_NIC 

!--- Note: Include routes for all of the networks that are internal to BBSM,
!--- including networks that are internal to routers.

Configure the SNMP Engine

Issue these commands to configure the SNMP engine:

SJ1(config)# snmp community RW_String RW

SJ1(config)# snmp community RO_String RO

Configure the Access List for Security Control

Issue these commands to configure the access list for security control:


!--- Issue these commands on one line each.

SJ1(config)# access-list 100 permit
            icmp Man_Network Wildcard any echo

SJ1(config)# access-list 100 permit
            tcp Man_Network Wildcard host BBSM_I/E_NIC eq 9488

SJ1(config)# access-list 100 permit
            tcp Man_Network Wildcard host BBSM_I/E_NIC eq  ftp

SJ1(config)# access-list 100 permit
            tcp Man_Network Wildcard host BBSM_I/E_NIC eq snmp

SJ1(config)# access-list 100 permit
            tcp Man_Network Wildcard host BBSM_I/E_NIC eq telnet

SJ1(config)# access-list 100 permit
            tcp Man_Network Wildcard host BBSM_I/E_NIC eq www

SJ1(config)# access-list 100 permit
            udp Man_Network Wildcard host BBSM_I/E_NIC eq tftp

SJ1(config)# access-list 100 permit
            icmp Man_Network Wildcard IP_Addr Wildcard echo

SJ1(config)# access-list 100 permit
            tcp Man_Network Wildcard IP_Addr Wildcard eq telnet

SJ1(config)# access-list 100 permit
            tcp Man_Network Wildcard IP_Addr Wildcard eq www

SJ1(config)# access-list 100 permit
            tcp Man_Network Wildcard IP_Addr Wildcard eq snmp

SJ1(config)# access-list 100 permit
            udp Man_Network Wildcard IP_Addr Wildcard eq tftp

SJ1(config)# access-list 100 deny ip any IP_Addr Wildcard 

SJ1(config)# access-list 100 deny icmp any any echo

SJ1(config)# access-list 100 permit ip any any

Note: The previous access-list statements may be repeated for multiple source and destination IP addresses, for source and destination port numbers, and for protocols.

Configure the Serial Interface

Issue these commands to configure the serial interface:

SJ1(config)# interface serial0/0

SJ1(config-if)# ip address IP_Address_1 Netmask 

SJ1(config-if)# ip nat outside

SJ1(config-if)# ip access-group 100 in

Configure the Ethernet Interface

Issue these commands to configure the Ethernet interface:

SJ1(config-if)# interface Ethernet0/0

SJ1(config-if)# ip address IP_Address_2 Netmask 

SJ1(config-if)# ip nat inside

Configure the Telnet Interface

Issue these commands to configure the Telnet interface:

SJ1(config-if)# line vty 0 4

SJ1(config-line)# password password_2 

SJ1(config-line)# login

SJ1(config-line# line vty 5 15

SJ1(config-line)# login

SJ1(config-line)# ^Z

!--- Ctrl-Z ends the configuration session.

Common Oversights and Mistakes

These common oversights and mistakes are associated with the configuration of the Cisco 2600 router:

  • NAT configurations are missing or are configured incorrectly

  • The route for the BBSM internal network(s) is missing or is incorrect

Configuring BBSM

Configuration

The BBSM Installation CD includes detailed instructions to configure the BBSM software at CD_Drive:\Documentation\config.pdf.

Note: You must install Adobe Acrobat Reader to view this file.

Common Oversights and Mistakes

These oversights and mistakes are common with the configuration of BBSM:

  • The filter on the external NIC is missing or is configured incorrectly.

  • If an error is committed during the installation of the BBSM software, then stop the installation, reformat the hard drive, and begin the installation again with a clean copy of Windows 2000 Server.

Configure the 3500 XL Switch—Base Switch Configuration

Enter Configuration Mode

Issue these commands to enter configuration mode:

Switch> enable

!--- Enter password, if prompted.

Switch# config terminal

Global Configuration

Issue these commands for global configuration:

Switch(config)# enable secret password_1 

Switch(config)# hostname BaseSwitch1

!--- Use a unique hostname for each switch, for easy identification.

BaseSwitch1(config)# ip default-gateway BBSM_Internal_NIC 

BaseSwitch1(config)# snmp community RW_String RW

BaseSwitch1(config)# snmp community RO_String RO

Configure the Access List for Security Control

Issue these commands to configure the access list for security control:


!--- Issue these commands on one line each.

BaseSwitch1(config)# access-list 100 permit
                   icmp host BBSM_Internal_NIC host Switch_IP echo

BaseSwitch1(config)# access-list 100 permit
                   tcp host BBSM_Internal_NIC host Switch_IP eq telnet

BaseSwitch1(config)# access-list 100 permit
                   tcp host BBSM_Internal_NIC host Switch_IP eq www

BaseSwitch1(config)# access-list 100 permit
                   udp host BBSM_Internal_NIC host Switch_IP eq tftp

BaseSwitch1(config)# access-list 100 permit
                   udp host BBSM_Internal_NIC host Switch_IP eq snmp

Configure the FastEthernet0/1 - 0/23 Interface

Issue these commands to configure the FastEthernet0/1 - 0/23 interface:

BaseSwitch1(config)# interface fastethernet0/x 

!--- Where x equals the interface number; for example, 0/1 or 0/23.

BaseSwitch1(config-if)# port protected

BaseSwitch1(config-if)# spanning-tree rootguard

BaseSwitch1(config-if)# spanning-tree portfast

Configure the FastEthernet0/1 - 0/24 Interface Storm Control (Optional)

Issue these commands to configure the FastEthernet0/1 - 0/24 interface storm control:

BaseSwitch1(config-if)# port block unicast

BaseSwitch1(config-if)# port block multicast

Configure the VLAN 1 Interface

Issue these commands to configure the VLAN 1 interface:

BaseSwitch1(config-if)# interface vlan 1

BaseSwitch1(config-if)# ip address Switch_IP Netmask 

BaseSwitch1(config-if)# ip access-group 100 in

BaseSwitch1(config-if)# no ip directed-broadcast

BaseSwitch1(config-if)# no ip route-cache

Configure the Telnet Interface

Issue these commands to configure the Telnet interface:

BaseSwitch1(config-if)# line vty 0 4

BaseSwitch1(config-line)# password password_2 

BaseSwitch1(config-line)# login

BaseSwitch1(config-line)# line vty 5 15

BaseSwitch1(config-line)# login

BaseSwitch1(config-line)# ^Z

!--- Ctrl-Z ends the configuration session.

Common Oversights and Mistakes

These oversights and mistakes are common with the configuration of the 3500 XL switch for a base switch configuration:

  • Do not include base switches in WEBConfig > Switches.

  • Interface FastEthernet0/24—the port that points towards the BBSM server—can not be configured with the port protected, spanning-tree rootguard, or spanning-tree portfast commands.

uBR7100 Cable Modem Termination System—IRB Configuration

Enter Configuration Mode

Issue these commands to enter configuration mode:

Router> enable

!--- Enter password, if prompted.

Router# config terminal

Global Configuration

Issue these commands for global configuration:

Router(config)# enable secret password_1 

Router(config)# hostname uBR7100

!--- Use a unique hostname for each CMTS, for easy identification.

uBR7100(config)# cable time-server

uBR7100(config)# ip routing

uBR7100(config)# ip subnet-zero

uBR7100(config)# no ip domain-lookup

uBR7100(config)# ip name-server BBSM_Internal_NIC 

uBR7100(config)# bridge irb

uBR7100(config)# ip classless

uBR7100(config)# no ip http server

uBR7100(config)# ip route 0.0.0.0 0.0.0.0 BBSM_Internal_NIC 

uBR7100(config)# snmp community RW_String RW

uBR7100(config)# snmp community RO_String RO

uBR7100(config)# bridge 1 protocol ieee

uBR7100(config)# bridge 1 route ip

Configure the Access List for Security Control

Issue these commands to configure the access list for security control:


!--- Issue these commands on one line each.

uBR7100(config)# access-list 100 permit
                icmp host BBSM_Internal_NIC host Switch_IP echo

uBR7100(config)# access-list 100 permit
                tcp host BBSM_Internal_NIC host Switch_IP eq telnet

uBR7100(config)# access-list 100 permit
                tcp host BBSM_Internal_NIC host Switch_IP eq www

uBR7100(config)# access-list 100 permit
                udp host BBSM_Internal_NIC host Switch_IP eq tftp

uBR7100(config)# access-list 100 permit
                udp host BBSM_Internal_NIC host Switch_IP eq SNMP

uBR7100(config)# access-list 100 permit
                ip host BBSM_Internal_NIC CM_Net_ID Wildcard_Mask_2 

uBR7100(config)# access-list 100 permit
                ip CM_Net_ID Wildcard_Mask_2 host BBSM_Internal_NIC

Configure the FastEthernet0/0 Interface

Issue these commands to configure the FastEthernet0/0 interface:

uBR7100(config)# interface fastethernet0/0

uBR7100(config-if)# no ip address

uBR7100(config-if)# no ip route-cache

uBR7100(config-if)# no ip mroute-cache

uBR7100(config-if)# duplex auto

uBR7100(config-if)# speed auto

uBR7100(config-if)# bridge-group 1

uBR7100(config-if)# no bridge-group 1 subscriber-loop-control

Configure the FastEthernet0/1 Interface

Issue these commands to configure the FastEthernet0/1 interface:

uBR7100(config-if)# interface fastethernet0/1

uBR7100(config-if)# no ip address

uBR7100(config-if)# no ip route-cache

uBR7100(config-if)# no ip mroute-cache

uBR7100(config-if)# shutdown

uBR7100(config-if)# duplex auto

uBR7100(config-if)# speed auto

uBR7100(config-if)# bridge-group 1

uBR7100(config-if)# no bridge-group 1 subscriber-loop-control

Configure the Cable1/0 Interface

Issue these commands to configure the Cable1/0 interface:

uBR7100(config-if)# interface cable1/0

uBR7100(config-if)# no ip address

uBR7100(config-if)# no ip route-cache

uBR7100(config-if)# no ip mroute-cache

uBR7100(config-if)# cable downstream annex B

uBR7100(config-if)# cable downstream modulation DS_Mod 

uBR7100(config-if)# cable downstream interleave-depth Int_Depth 

uBR7100(config-if)# cable downstream frequency DS_Freq 

uBR7100(config-if)# no cable downstream rf-shutdown

uBR7100(config-if)# cable upstream 0 frequency US0_Freq 

uBR7100(config-if)# cable upstream 0 power-level US0_Power 

uBR7100(config-if)# cable upstream 0 channel-width US0_Ch_Width 

uBR7100(config-if)# no cable upstream 0 shutdown

uBR7100(config-if)# cable upstream 1 frequency US1_Freq 

uBR7100(config-if)# cable upstream 1 power-level US1_Power 

uBR7100(config-if)# cable upstream 1 channel-width US1_Ch_Width 

uBR7100(config-if)# no cable upstream 1 shutdown

uBR7100(config-if)# cable upstream 2 frequency US2_Freq 

uBR7100(config-if)# cable upstream 2 power-level US2_Power 

uBR7100(config-if)# cable upstream 2 channel-width US2_Ch_Width 

uBR7100(config-if)# no cable upstream 2 shutdown

uBR7100(config-if)# cable upstream 3 frequency US3_Freq 

uBR7100(config-if)# cable upstream 3 power-level US3_Power 

uBR7100(config-if)# cable upstream 3 channel-width US3_Ch_Width 

uBR7100(config-if)# no cable upstream 3 shutdown

uBR7100(config-if)# bridge-group 1

uBR7100(config-if)# no bridge-group 1 subscriber-loop-control

Configure the Bridgegroup Virtual Interface 1 Interface

Issue these commands to configure the Bridge Group Virtual Interface (BVI) 1 interface:

uBR7100(config-if)# interface bvi 1

uBR7100(config-if)# ip address Switch_IP BBSM_Network_SNM secondary

uBR7100(config-if)# ip address CM_Network_IP_Address CM_Network_SNM 

uBR7100(config-if)# ip access-group 100 in

uBR7100(config-if)# ip helper-address BBSM_Internal_NIC 

uBR7100(config-if)# no ip route-cache

uBR7100(config-if)# no ip mroute-cache

uBR7100(config-if)# no keepalive

Configure the Telnet Interface

Issue these commands to configure the Telnet interface:

uBR7100 (config-if)# line vty 0 4

uBR7100 (config-line)# password password_2 

uBR7100 (config-line)# login

uBR7100 (config-line)# line vty 5 15

uBR7100 (config-line)# login

uBR7100 (config-line)# ^Z

!--- Ctrl-Z  ends the configuration session.

Common Oversights and Mistakes

These oversights and mistakes are common with the configuration of the uBR7100 CMTS:

  • The uBR7114 has four upstream ports. The uBR7111 has only one US port; therefore, you can only configure US0. See Configure the Cable 1/0 Interface for more information.

  • When you are using an uBR7114, make sure that all of the upstream frequencies are different and do not overlap.

  • Be sure to turn off the subscriber-loop-control on all interfaces (with the no bridge 1 subscriber-loop-control command) and copy a specific startup-config for Cable 1/0. It is turned on by default for Cable 1/0, and reappears after a reboot, if not specifically disabled.

  • When in Integrated Routing and Bridging (IRB) mode, the physical interfaces do not receive IP addresses.

uBR7100 Cable Modem Termination System – Bridge Configuration

Enter Configuration Mode

Issue these commands to enter configuration mode:

Router> enable

!--- Enter password, if prompted.

Router# config terminal

Global Configuration

Issue these commands for global configuration:

Router(config)# enable secret password_1 

Router(config)# hostname uBR7100

!--- Use a unique hostname for each CMTS, for easy identification.

uBR7100(config)# cable time-server

uBR7100(config)# ip subnet-zero

uBR7100(config)# no ip domain-lookup

uBR7100(config)# ip name-server BBSM_Internal_NIC 

uBR7100(config)# ip classless

uBR7100(config)# no ip http server

uBR7100(config)# ip default-gateway BBSM_Internal_NIC 

uBR7100(config)# snmp community RW_String RW

uBR7100(config)# snmp community RO_String RO

uBR7100(config)# bridge 1 protocol ieee

Configure the Access List for Security Control

Issue these commands to configure the access list for security control:


!--- Issue these commands on one line each.

uBR7100(config)# access-list 100 permit
                icmp host BBSM_Internal_NIC host Switch_IP echo

uBR7100(config)# access-list 100 permit
                tcp host BBSM_Internal_NIC host Switch_IP eq telnet

uBR7100(config)# access-list 100 permit
                tcp host BBSM_Internal_NIC host Switch_IP eq www

uBR7100(config)# access-list 100 permit
                udp host BBSM_Internal_NIC host Switch_IP eq tftp

uBR7100(config)# access-list 100 permit
                udp host BBSM_Internal_NIC host Switch_IP eq SNMP

uBR7100(config)# access-list 100 permit
                ip host BBSM_Internal_NIC CM_Net_ID Wildcard_Mask_2 

uBR7100(config)# access-list 100 permit
                ip CM_Net_ID Wildcard host BBSM_Internal_NIC

Configure the FastEthernet0/0 Interface

Issue these commands to configure the FastEthernet0/0 interface:

uBR7100(config)# interface fastethernet0/0

uBR7100(config-if)# ip address Switch_IP BBSM_Network_SNM 

uBR7100(config-if)# no ip route-cache

uBR7100(config-if)# no ip mroute-cache

uBR7100(config-if)# duplex auto

uBR7100(config-if)# speed auto

uBR7100(config-if)# bridge-group 1

Configure the FastEthernet0/1 Interface

Issue these commands to configure the FastEthernet0/1 interface:

uBR7100(config-if)# interface fastethernet0/1

uBR7100(config-if)# no ip address

uBR7100(config-if)# no ip route-cache

uBR7100(config-if)# no ip mroute-cache

uBR7100(config-if)# shutdown

uBR7100(config-if)# duplex auto

uBR7100(config-if)# speed auto

uBR7100(config-if)# bridge-group 1

Configure the Cable1/0 Interface

Issue these commands to configure the Cable1/0 interface:

uBR7100(config-if)# interface cable1/0

uBR7100(config-if)# ip address Switch_IP BBSM_Network_SNM 

uBR7100(config-if)# no ip route-cache

uBR7100(config-if)# no ip mroute-cache

uBR7100(config-if)# cable downstream annex B

uBR7100(config-if)# cable downstream modulation DS_Mod 

uBR7100(config-if)# cable downstream interleave-depth Int_Depth 

uBR7100(config-if)# cable downstream frequency DS_Freq 

uBR7100(config-if)# no cable downstream rf-shutdown

uBR7100(config-if)# cable upstream 0 frequency US0_Freq 

uBR7100(config-if)# cable upstream 0 power-level US0_Power 

uBR7100(config-if)# cable upstream 0 channel-width US0_Ch_Width 

uBR7100(config-if)# no cable upstream 0 shutdown

uBR7100(config-if)# cable upstream 1 frequency US1_Freq 

uBR7100(config-if)# cable upstream 1 power-level US1_Power 

uBR7100(config-if)# cable upstream 1 channel-width US1_Ch_Width 

uBR7100(config-if)# no cable upstream 1 shutdown

uBR7100(config-if)# cable upstream 2 frequency US2_Freq 

uBR7100(config-if)# cable upstream 2 power-level US2_Power 

uBR7100(config-if)# cable upstream 2 channel-width US2_Ch_Width 

uBR7100(config-if)# no cable upstream 2 shutdown

uBR7100(config-if)# cable upstream 3 frequency US3_Freq 

uBR7100(config-if)# cable upstream 3 power-level US3_Power 

uBR7100(config-if)# cable upstream 3 channel-width US3_Ch_Width 

uBR7100(config-if)# no cable upstream 3 shutdown

uBR7100(config-if)# bridge-group 1

uBR7100(config-if)# no bridge-group 1 subscriber-loop-control

Configure the Telnet Interface

Issue these commands to configure the Telnet interface:

uBR7100 (config-if)# line vty 0 4

uBR7100 (config-line)# password password_2 

uBR7100 (config-line)# login

uBR7100 (config-line)# line vty 5 15

uBR7100 (config-line)# login

uBR7100 (config-line)# ^Z

!--- Ctrl-Z ends the configuration session.

Common Oversights and Mistakes

These oversights and mistakes are common with the configuration of the uBR7100 CMTS for Bridge configuration:

  • The uBR7114 has four upstream ports. The uBR7111 has only one US port; therefore, you can only configure US0.

  • When you are using a uBR7114, make sure that all of the upstream frequencies are different and do not overlap.

  • Be sure to turn off the subscriber-loop-control on all interfaces (with the no bridge 1 subscriber-loop-control command) and copy a specific startup-config for Cable 1/0. It is turned on by default for Cable 1/0, and will reappear after a reboot, if not disabled.

uBR7x00 Cable Modem Termination System – Routed Configuration

Enter Configuration Mode

Issue these commands to enter configuration mode:

Router> enable

!--- Enter password, if prompted.

Router# config terminal

Global Configuration

Issue these commands for global configuration:

Router(config)# enable secret password_1 

Router(config)# hostname uBR7100

!--- Use a unique hostname for each CMTS, for easy identification.

uBR7100(config)# cable time-server

uBR7100(config)# ip routing

uBR7100(config)# ip subnet-zero

uBR7100(config)# no ip domain-lookup

uBR7100(config)# ip name-server BBSM_Internal_NIC 

uBR7100(config)# ip classless

uBR7100(config)# no ip http server

uBR7100(config)# ip route 0.0.0.0 0.0.0.0 BBSM_Internal_NIC 

uBR7100(config)# snmp community RW_String RW

uBR7100(config)# snmp community RO_String RO

Configure the Access List for Security Control

Issue these commands to configure the access list for security control:


!--- Issue these commands on one line each.

uBR7100(config)# access-list 100 permit
                icmp host BBSM_Internal_NIC host Client_IP_Address echo

uBR7100(config)# access-list 100 permit
                tcp host BBSM_Internal_NIC host Client_IP_Address eq telnet

uBR7100(config)# access-list 100 permit
                tcp host BBSM_Internal_NIC host Client_IP_Address eq www

uBR7100(config)# access-list 100 permit
                udp host BBSM_Internal_NIC host Client_IP_Address eq tftp

uBR7100(config)# access-list 100 permit
                udp host BBSM_Internal_NIC host Client_IP_Address eq SNMP

uBR7100(config)# access-list 100 permit
                ip host BBSM_Internal_NIC CM_Net_ID Wildcard_Mask_2 

uBR7100(config)# access-list 100 permit
                ip CM_Net_ID Wildcard host BBSM_Internal_NIC

Configure the FastEthernet0/0 Interface

Issue these commands to configure the FastEthernet0/0 interface:

uBR7100(config)# interface fastethernet0/0

uBR7100(config-if)# ip address Gateway_to_Router BBSM_Network_SNM 

uBR7100(config-if)# no ip route-cache

uBR7100(config-if)# no ip mroute-cache

uBR7100(config-if)# duplex auto

uBR7100(config-if)# speed auto

Configure the FastEthernet0/1 Interface

Issue these commands to configure the FastEthernet0/1 interface:

uBR7100(config-if)# interface fastethernet0/1

uBR7100(config-if)# no ip address

uBR7100(config-if)# no ip route-cache

uBR7100(config-if)# no ip mroute-cache

uBR7100(config-if)# shutdown

uBR7100(config-if)# duplex auto

uBR7100(config-if)# speed auto

Configure the Cable1/0 Interface

Issue these commands to configure the Cable1/0 interface:

uBR7100(config-if)# interface cable1/0

uBR7100(config-if)# ip address Client_IP_Address Client_SNM secondary

uBR7100(config-if)# ip address Client_IP_Address Client_SNM secondary

uBR7100(config-if)# ip address CM_IP_Address CM_SNM 

uBR7100(config-if)# ip access-group 100 in

uBR7100(config-if)# no ip route-cache

uBR7100(config-if)# no ip mroute-cache

uBR7100(config-if)# cable downstream annex B

uBR7100(config-if)# cable downstream modulation DS_Mod 

uBR7100(config-if)# cable downstream interleave-depth Int_Depth 

uBR7100(config-if)# cable downstream frequency DS_Freq 

uBR7100(config-if)# no cable downstream rf-shutdown

uBR7100(config-if)# cable upstream 0 frequency US0_Freq 

uBR7100(config-if)# cable upstream 0 power-level US0_Power 

uBR7100(config-if)# cable upstream 0 channel-width US0_Ch_Width 

uBR7100(config-if)# no cable upstream 0 shutdown

uBR7100(config-if)# cable upstream 1 frequency US1_Freq 

uBR7100(config-if)# cable upstream 1 power-level US1_Power 

uBR7100(config-if)# cable upstream 1 channel-width US1_Ch_Width 

uBR7100(config-if)# no cable upstream 1 shutdown

uBR7100(config-if)# cable upstream 2 frequency US2_Freq 

uBR7100(config-if)# cable upstream 2 power-level US2_Power 

uBR7100(config-if)# cable upstream 2 channel-width US2_Ch_Width 

uBR7100(config-if)# no cable upstream 2 shutdown

uBR7100(config-if)# cable upstream 3 frequency US3_Freq 

uBR7100(config-if)# cable upstream 3 power-level US3_Power 

uBR7100(config-if)# cable upstream 3 channel-width US3_Ch_Width 

uBR7100(config-if)# no cable upstream 3 shutdown

uBR7100(config-if)# cable helper-address BBSM_Internal_NIC 

uBR7100(config-if)# cable dhcp-giaddr policy

Configure the Telnet Interface

Issue these commands to configure the Telnet interface:

uBR7100 (config-if)# line vty 0 4

uBR7100 (config-line)# password password_2 

uBR7100 (config-line)# login

uBR7100 (config-line)# line vty 5 15

uBR7100 (config-line)# login

uBR7100 (config-line)# ^Z

!--- Ctrl-Z ends the configuration session.

Common Oversights and Mistakes

These oversights and mistakes are common with the configuration of the uBR7x00 CMTS for Routed configuration:

  • The uBR7111 has only one upstream port; therefore, you can only configure US0.

  • When you are using multiple upstream ports, make sure all of the upstream frequencies are different and do not overlap.

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Updated: Oct 26, 2005Document ID: 28644