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Cisco uBR924 Configuration Manual
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Cisco uBR924 Configuration Manual

Cisco uBR924 Configuration Manual

Cable access router
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Download this manual See also: Installation and Startup, Troubleshooting Tips
Bridging and Routing Features for the
Cisco uBR924 Cable Access Router
Feature Overview
The Cisco uBR924 cable access router is a fully-functional Cisco IOS router and standards-based
bidirectional cable modem that gives a residential or small office/home office (SOHO) subscriber
high-speed Internet or Intranet access and packet telephone services via a shared two-way cable
system and IP backbone network. The Cisco uBR924 is based on the current Data-Over-Cable
Service Interface Specifications (DOCSIS) standards.
The Cisco uBR924 cable access router connects computers, telephone equipment, and other
customer premises devices at a subscriber site to the service provider's Hybrid/Fiber Coax (HFC)
and IP backbone network. Subscribers can access the Internet at speeds of up to 10 Mbps as well as
make telephone calls—all using the same cable system that delivers broadcast TV signals.
The Cisco uBR924 is a compact device that supports the direct connection of up to four PCs and has
the familiar features and programming interface of other routers in Cisco's extensive line of small-
and medium-sized business product offerings. The Cisco uBR924 provides packet data transport and
network address translation for TCP/IP applications between home or office computers and the cable
headend.
Note
You can configure the cable access router to act as a bridge or as a router. See Figure 1 and Figure 2.
For more detailed descriptions of these options, see the "Configuration Options" section on page 3.
Figure 1
Cisco uBR7200 series
This document describes the features available in Cisco IOS Release 12.0(5)T.
Cisco uBR924 in a Bridging Configuration
CATV
coaxial cable
CMTS
HFC network
Bridging and Routing Features for the Cisco uBR924 Cable Access Router 1
Ethernet
Ethernet
Cisco uBR900 series
cable access router
Ethernet
Ethernet
PC
PC
PC
PC or hub

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Summary of Contents for Cisco uBR924

  • Page 1 TV signals. The Cisco uBR924 is a compact device that supports the direct connection of up to four PCs and has the familiar features and programming interface of other routers in Cisco’s extensive line of small- and medium-sized business product offerings.
  • Page 2 CMTS HFC network The Cisco uBR924 cable access router is referred to as a subscriber unit. The subscriber unit functions as an interface between the subscriber’s customer premises equipment (CPE) devices at the small office/home office and the cable operator’s network (the headend).
  • Page 3 CMTS shares a 27 Mbps or 26 Mbps, 6 MHz data channel in the 88 to 860 MHz range. The Cisco uBR924 cable access router shares an upstream data rate of up to 10 Mbps on a 200 kHz-wide to 3.2 MHz-wide channel in the 5 to 42 MHz range.
  • Page 4 DOCSIS-compliant transparent bridging. In bridging applications, the Cisco uBR924 acts as a transparent bridge for up to four PCs plugged directly into the four Ethernet ports on the rear panel of the unit. The cable access router is connected to the Internet via the coaxial cable.
  • Page 5 Routing Routing The Cisco uBR924 cable access router can also 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.
  • Page 6 • If the Cisco uBR924 cable access router is connected to a DOCSIS 1.0 headend that does not support multiple CoS per cable access router, voice and data will be mixed, and voice traffic will be transmitted on a best effort basis. This may cause poorer voice quality and lower data throughput when calls are being made from the cable access router’s telephone ports.
  • Page 7 Supported Platforms Supported Platforms The Cisco uBR924 cable access router is a standalone device; it works in conjunction with the Cisco uBR7246 and the Cisco uBR7223 universal broadband routers. Prerequisites In order to use the Cisco uBR924 cable access router for data-over-cable applications, the following tasks must be completed: •...
  • Page 8 In order to use the Cisco uBR924 cable access router for VoIP-over-cable applications, the following additional conditions must be met: • In order to run VoIP Fax, the uBR924 cable access router must be configured for voice and you must be using Cisco IOS Release 12.0(5)T or higher. Supported MIBs and RFCs The Cisco uBR924 cable access router supports the following: •...
  • Page 9 Cable Device MIB reports statistics on the cable access router, while the RFI MIB reports statistics on the radio frequency transmissions over the cable television line. For descriptions of supported MIBs and how to use MIBs, see Cisco’s MIB web site on CCO at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.
  • Page 10 QAM constellation can be computed by 2 raised to the power of <number of bits/symbol>. For example, 16-QAM has 4 bits per symbol, 64-QAM has 6 bits per symbol, and 256-QAM has 8 bits per symbol. Cisco IOS Release 12.0(5)T...

  • Page 11: Table Of Contents

    Reestablishing DOCSIS-Compliant Bridging on page 18 • Customizing the Cable Access Router Interface on page 19 Before attempting to reconfigure a Cisco uBR924 cable access router at a subscriber site, contact Caution your network management, provisioning manager, or billing system administrator to ensure remote configuration is allowed.

  • Page 12: Configuring A Host Name And Password

    Setting an encrypted password allows you to prevent unauthorized configuration changes. Passwords are case sensitive. Note To configure a host name and an encrypted password for a Cisco uBR924 cable access router, perform the following tasks, starting in global configuration mode: Step Command...

  • Page 13: Configuring Ethernet And Cable Access Router Interfaces

    Make sure you are using the correct IP address. • Make sure the cable interface is not shut down. Use the show running-config command to check the cable interface status. Bridging and Routing Features for the Cisco uBR924 Cable Access Router 13...

  • Page 14: Configuring Routing

    Configuring Routing Configuring Routing DOCSIS-compliant transparent bridging is the factory default configuration of the Cisco uBR924 cable access router. To change the configuration of your cable access router from bridging to routing using the CLI, perform the following tasks, starting in global configuration mode:...
  • Page 15 699000000 39 no cable-modem compliant bridge router rip network 4.0.0.0 network 172.16.0.0 ip classless no ip http server line con 0 transport input none line vty 0 4 Bridging and Routing Features for the Cisco uBR924 Cable Access Router 15...

  • Page 16: Configuring Bridging

    Configuring Bridging Configuring Bridging The Cisco uBR924 cable access router is configured for DOCSIS-compliant transparent bridging by default. If it becomes necessary to reconfigure the unit for bridging after it has been configured for routing, you can erase the routing configuration and return the unit to factory default configuration settings, or you can reconfigure the unit manually using the CLI.
  • Page 17 Note To configure multiple PCs, repeat Steps 4 through 7 above for each additional PC. You can connect a maximum of three PCs to the Cisco uBR924 cable access router in a bridging application. Verifying Bridging To verify that routing has been disabled on all interfaces and that bridging has been reenabled, enter the show startup-config command from privileged EXEC mode:...

  • Page 18: Reestablishing Docsis-Compliant Bridging

    NVRAM). After entering this command, perform a warm reset of the Cisco uBR924 cable access router by pressing and holding down the Reset button for less than 10 seconds. For information on the location and operation of the Reset button, refer to the “Physical Description”...

  • Page 19: Customizing The Cable Access Router Interface

    Different geographical regions and different cable plants use different frequency bands. The Cisco uBR924 cable access router uses a built-in default frequency scanning feature to address this issue. After the cable access router finds a successful downstream frequency channel, it saves the channel and power setting to NVRAM.

  • Page 20: Current Configuration

    VoIP Bridging Configuration Using H.323v2 on page 23 • VoIP Routing Configuration Using H.323v2 on page 24 Basic Internet Access Bridging Configuration The following Cisco uBR924 cable access router configuration supports a typical residential Internet-access, data only subscriber: Current configuration: version 12.0...

  • Page 21: Clock Timezone

    Basic Internet Access Routing Configuration The Cisco uBR924 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 sample configuration file follows.

  • Page 22: No Cable-Modem Compliant Bridge

    0 4 Multicast-Enabled Routing Configuration The following configuration is for a Cisco uBR924 that uses PIM sparse-dense mode and belongs to a specific multicast group. Other multicast routing protocols such as PIM sparse-mode or PIM dense-mode can be used.

  • Page 23: Transport Input None Line Vty 0

    0 4 VoIP Bridging Configuration Using H.323v2 In this example, the Cisco uBR924 is configured for bridging, with an H.323v2 dial peer to another Cisco uBR924 attached to the same downstream interface on the headend CMTS. Current configuration:...
  • Page 24 0 4 login VoIP Routing Configuration Using H.323v2 In this example, the Cisco uBR924 is configured for IP routing, with an H.323v2 dial peer to another Cisco uBR924 attached to the same downstream interface on the headend CMTS. Current configuration: ! No configuration change since last restart version 12.0...
  • Page 25 <<==== Not necessary no ip classless ip route 0.0.0.0 0.0.0.0 10.1.71.1 no ip http server line con 0 exec-timeout 0 0 transport input none line vty 0 4 login Bridging and Routing Features for the Cisco uBR924 Cable Access Router 25...
  • Page 26 627000000 54 no cable-modem compliant bridge ip default-gateway 24.3.90.2 ip classless ip route 0.0.0.0 0.0.0.0 24.3.90.2 access-list 1 permit any line con 0 line vty 0 4 login Cisco IOS Release 12.0(5)T...
  • Page 27 All commands relating to VoIP applications are documented in the Cisco IOS Release 12.0 command references, or in Voice over IP for the Cisco AS5300, which can be accessed online or on the Documentation CDROM by going to New Features in Cisco IOS Release 12.0(3)T.
  • Page 28 CLI commands. See the “Configuring Bridging” section on page 16 for instructions. Examples The following example shows how to enter the cable-modem compliant bridge command for a cable access router interface, starting from global configuration mode: uBR924(config)# interface cable-modem 0 uBR924(config-if)# cable-modem compliant bridge uBR924(config-if)# Cisco IOS Release 12.0(5)T...
  • Page 29 Cisco uBR924 to the CMTS. cable-modem voip best-effort Allows voice traffic to be transmitted on the upstream via best effort rather than by assigning it a higher priority class of service. Bridging and Routing Features for the Cisco uBR924 Cable Access Router 29...
  • Page 30 Use the no cable-modem downstream saved channel ds-frequency us-power command to remove the saved frequency and power setting from the running configuration, which will be resaved at the next initialization cycle. Cisco recommends that this command NOT be used by end users of the Cisco uBR924 cable access router. Examples The following example shows how to remove the downstream frequency of 91000000 Hz and the upstream power level of 33 dBmV from the running configuration of a cable-modem interface,...
  • Page 31 Cisco uBR924 to the CMTS. cable-modem voip best-effort Allows voice traffic to be transmitted on the upstream via best effort rather than by assigning it a higher priority class of service. Bridging and Routing Features for the Cisco uBR924 Cable Access Router 31...
  • Page 32 Examples The following example shows how to enter the cable-modem fast-search command, starting from global configuration mode: uBR924(config)# interface cable-modem 0 uBR924(config-if)# cable-modem fast-search uBR924(config-if)# Cisco IOS Release 12.0(5)T...
  • Page 33 Cisco uBR924 to the CMTS. cable-modem voip best-effort Allows voice traffic to be transmitted on the upstream via best effort rather than by assigning it a higher priority class of service. Bridging and Routing Features for the Cisco uBR924 Cable Access Router 33...
  • Page 34 Usage Guidelines Examples The following example shows how to enter the cable-modem upstream preamble qpsk command for a cable access router interface, starting from global configuration mode: uBR924(config)# interface cable-modem 0 uBR924(config-if)# cable-modem upstream preamble qpsk uBR924(config-if)# Cisco IOS Release 12.0(5)T...
  • Page 35 Cisco uBR924. cable-modem voip best-effort Allows voice traffic to be transmitted on the upstream via best effort rather than by assigning it a higher priority class of service. Bridging and Routing Features for the Cisco uBR924 Cable Access Router 35...
  • Page 36 This command was first introduced. Usage Guidelines This command allows you to configure the voice traffic on a Cisco uBR924 to allow only calls having a high priority service identifier (SID) to be connected. If the dynamic configuration of high priority queues for voice traffic fails, or if the far end cannot support the multiple SIDs and multiple classes of service required by high priority traffic, the flag...
  • Page 37 Enables a faster downstream search algorithm on the cable interface of a Cisco uBR924. cable-modem upstream preamble qpsk Enables the QPSK modulation scheme in the upstream direction from the Cisco uBR924 to the CMTS. Bridging and Routing Features for the Cisco uBR924 Cable Access Router 37...
  • Page 38 To specify the cable interface on a Cisco uBR924 cable access router, enter the interface cable-modem command from global configuration mode. interface cable-modem number Syntax Description number The interface number of the cable interface on the rear panel of the cable access router.
  • Page 39 Cisco uBR924 to the CMTS. cable-modem voip best-effort Allows voice traffic to be transmitted on the upstream via best effort rather than by assigning it a higher priority class of service. Bridging and Routing Features for the Cisco uBR924 Cable Access Router 39...
  • Page 40 To display bridging information for a Cisco uBR924 cable access router, enter the show bridge cable-modem command from privileged EXEC mode. show bridge cable-modem number Syntax Description number The interface number of the cable interface on the rear panel of the Cisco uBR924.
  • Page 41 Command Description show dhcp Displays the current DHCP settings on point-to-point interfaces. show interfaces cable-modem Displays information about the cable interface on the Cisco uBR924 cable access router. Bridging and Routing Features for the Cisco uBR924 Cable Access Router 41...
  • Page 42 You can use this command on any point-to-point type of interface that uses DHCP for temporary IP address allocation. Examples Following is sample output for the show dhcp lease command: uBR924# show dhcp lease Temp IP addr: 188.188.1.40 for peer on Interface: cable-modem0 Temp sub net mask: 0.0.0.0 DHCP Lease server: 4.0.0.32, state: 3 Bound...
  • Page 43 Renew, or Rebinding. For descriptions of these states, see RFC 2131. DHCP transaction id Unique number established by the Cisco uBR924 before the first request message is sent to the DHCP server. The same transaction id is used as long as the lease keeps getting renewed and is valid.
  • Page 44 Allows voice traffic to be transmitted on the upstream via best effort rather than by assigning it a higher priority class of service. show bridge cable-modem Ddisplays bridging information for a Cisco uBR924 cable access router. show interfaces cable-modem Displays information about the cable interface on the Cisco uBR924 cable access router.
  • Page 45 To display information about the Cisco uBR924 cable access router’s cable interface, enter the show interfaces cable-modem command from either user EXEC mode or privileged EXEC mode. show interfaces cable-modem number [accounting | counters | crb | irb | type]...
  • Page 46 Examples Traffic passing through the cable access router interface is shown in the following example: uBR924# show interfaces cable-modem 0 cable-modem0 is up, line protocol is up Hardware is BCM3300, address is 0050.7366.2439 (bia 0050.7366.2439) Internet address is 5.2.0.11/16...
  • Page 47 Bridging and Routing Features for the Cisco uBR924 Cable Access Router 47...
  • Page 48 Interface resets can also occur when an interface is looped back or shut down. output buffer failures Number of times the output buffer has failed. output buffers swapped out Number of times the output buffer has been swapped out. Cisco IOS Release 12.0(5)T...
  • Page 49 Number of times the downstream input first-in first-out (FIFO) buffer became full on the Cisco uBR924. Re-requests Number of times a bandwidth request generated by the Cisco uBR924 was not responded to by the CMTS. DS MAC Message Overruns Number of times the Cisco uBR924’s DMA controller had a downstream MAC message and there were no free MAC message buffer descriptors to accept the message.
  • Page 50 Field Description DS Data Overruns Number of times the Cisco uBR924’s DMA controller had downstream data and there were no free data PDU buffer descriptors to accept the data. Received MAPs Number of times a MAP message passed all filtering requirements and was received by the Cisco uBR924.
  • Page 51 Displays bridging information for a Cisco uBR924 cable access router. show interfaces cable-modem Displays information about the cable interface on the Cisco uBR924 cable access router. Bridging and Routing Features for the Cisco uBR924 Cable Access Router 51...
  • Page 52 All cable-modem debug commands used with the uBR924 cable access router are documented in Troubleshooting Tips for the Cisco uBR924 Cable Access Router, which can be accessed online or on the Documentation CDROM by going to New Features in Cisco IOS Release 12.0(5)T.

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