Cisco Systems MC-607 manual Routing Applications, MC-615

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Configuring Subscriber-End Broadband Access Router Features

Subscriber-End Broadband Access Router Data Operations

Figure 111 Cisco uBR900 Series Cable Access Router in a Bridging Configuration

Ethernet

PC

 

CATV

 

coaxial cable

Cisco uBR7200 series

Cisco uBR900 series

CMTS

cable access router

 

HFC network

 

Ethernet

Ethernet

Ethernet

PC

PC

PC or hub

13305

DOCSIS-compliant transparent bridging is the factory default configuration of the Cisco uBR900 series cable access router. If your cable service provider is using a DHCP server, all you need to do is connect the cables and power on the cable access router; your service provider configuration program will automatically configure both the coaxial cable interface and the bridging functionality. You need not set up IP addresses for the attached PCs or enter any CLI configuration commands. This type of operation is called “plug-and-play” bridging.

In DOCSIS-compliant bridging mode, the cable access router is able to locate a downstream and upstream channel; find the ToD, TFTP, and DHCP server(s); obtain an IP address; download a DOCSIS configuration file; and obtain DHCP parameters to work in a bridging mode.

You can configure a customized bridging application on the Cisco uBR900 series using a downloadable configuration file or the CLI. For details, see the sections “Configuring Bridging” and “Customizing the Cable Access Router Interface” later in this chapter.

Routing Applications

The Cisco uBR900 series cable access router can be configured to act as a router to preserve IP address space and limit broadcasts that can impact the performance of the network. A typical use would be if you are connecting the cable access router to an internal Ethernet hub that is connected to an existing PC network. The Cisco uBR900 series supports Routing Information Protocol Version 2 (RIP V2) for this application.

When configured in routing mode, the Cisco uBR900 series is automatically configured to use the headend IP address as its IP default gateway. This allows the cable access router to send packets not intended for the Ethernet interface to the headend when IP host-routing is configured.

RIP V2 routing is useful for small internetworks in that it enables optimization of Network Interface Center (NIC)-assigned IP addresses by defining variable-length subnet masks (VLSMs) for network addresses, and it allows classless interdomain routing (CIDR) addressing schema.

Cisco IOS Multiservice Applications Configuration Guide

MC-615

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Contents MC-607 Configuring Subscriber-End Broadband Access Router FeaturesCisco IOS Software Feature Sets Subscriber-end OverviewMC-608 Base IP Bridging Feature Set Home Office Easy IP Feature SetMC-609 Small Office Feature Set Telecommuter Feature SetMC-610 MC-611 Operating ModesData Specifications Description Downstream Values Upstream ValuesMC-612 MC-613 Service AssignmentsDownstream and Upstream Data Transfer Bridging ApplicationsMC-614 MC-615 Routing ApplicationsEasy IP L2TP ProtocolDhcp Server Network Address Translation and Port Address TranslationMC-617 Voice over IP OperationsSimplified VoIP over Cable Network MC-618MC-619 Voice Compression and DecompressionMC-620 Protocol StackSgcp Protocol Stack Subscriber-End Broadband Access Router Voice SpecificationsMetric Value MC-621MC-622 Backup Pots ConnectionDocsis Baseline Privacy IPSec Network SecurityMC-623 Firewall Triple Data Encryption StandardNetRanger Support-Cisco IOS Intrusion Detection MC-624MC-625 Subscriber-End Broadband Access Router Configuration OptionsMC-626 MC-627 Event DescriptionMC-628 Sequence Event DescriptionMC-629 MC-630 MC-631 Cable Modem Initialization FlowchartMC-632 Subscriber-End Broadband Access Router Basic TroubleshootingWaitforlinkupstate MC-633UBR924# show controllers cable-modem 0 mac ? MC-634Event 1-Wait for the Link to Come Up Event 2-Scan for a Downstream Channel, then SynchronizeMC-635 Event 4-Start Ranging for Power Adjustments Event 3-Obtain Upstream ParametersMC-636 MC-637 Event 5-Establish IP ConnectivityEvent 7-Establish Security Event 6-Establish the Time of DayEvent 8-Transfer Operational Parameters Event 9-Perform RegistrationEvent 11-Enter the Maintenance State Event 10-Comply with Baseline PrivacyMC-639 MC-640 Subscriber-End Broadband Access Router Configuration TasksConfiguring a Host Name and Password Command PurposeMC-641 MC-642 Configuring Ethernet and Cable Access Router InterfacesMC-643 Configuring RoutingMC-644 Verifying RoutingMC-645 Configuring BridgingMC-646 MC-647 Reestablishing DOCSIS-Compliant BridgingMC-648 Verifying DOCSIS-Compliant BridgingCustomizing the Cable Access Router Interface Using Multiple PCs with the Cable Access RouterMC-649 MC-650 Basic Internet Access Bridging Configuration ExampleMC-651 Basic Internet Access Routing Configuration ExampleMC-652 IP Multicast Routing Configuration ExampleMC-653 VoIP Bridging Using H.323v2 Configuration ExampleMC-654 VoIP Routing Using H.323v2 Configuration ExampleMC-655 NAT/PAT Configuration ExampleMC-656 VoIP Bridging Using Sgcp Configuration ExampleMC-657 IPSec Configuration ExampleMC-658 L2TP Configuration ExampleMC-659 MC-660