Configuring Headend Broadband Access Router Features This chapter contains procedures for configuring the Cisco uBR7200 series universal broadband routers using the Cisco command-line interface (CLI). For detailed descriptions of the commands used, refer to the Cisco IOS Multiservice Applications Command Reference publication.
Configuring Headend Broadband Access Router Features Headend Overview Headend Overview a WAN backbone and a hybrid fiber-coaxial (HFC) cable network.
Configuring Headend Broadband Access Router Features Headend Overview Figure 106 Topology of a Typical Broadband Network Internet WAN ATM, 100BT, 10BT 100BT 100BT Proxy server Cisco uBR7246 ISP 100BT IF MSO: Multiple Service Organization US-RF Analog TV 5-42 MHz signals Upconverter RF DS-RF 54-860 Mhz Combiner Digital TV signals Fiber Transceiver 80 km 1000 ft Fiber node (Telephone pole, underground box) Tap Cable modem (Cisco uBR904) 11278 Drop box Two-way distribution amplifier Cisco
Configuring Headend Broadband Access Router Features Voice over IP Services • Data interfaces for cable modems and CPE devices, as well as the CMTS network-side interface between the Cisco uBR7200 series routers and the data network. • Operations support interfaces—Network element management layer interfaces between the network elements and the operations support systems.
Configuring Headend Broadband Access Router Features Telco Return Figure 107 Two-Way IP Telephony Network Diagram Gateway/PSTN Service provider backbone Cisco uBR7200 series Gatekeeper or calling agents Remote cable modem Calling party Residence or SOHO* subscriber site 1 Policy server HFC cable plant Remote cable modem Called party Residence or SOHO* subscriber site 2 25659 HFC cable plant Cisco uBR7200 series *Small Office Home Office The Cisco uBR7200 series equipment and DOCSIS-based cabl
Configuring Headend Broadband Access Router Features Telco Return Cisco uBR7200 series input/output (I/O) controller or applicable port adapter. Upstream data is through a telephone modem typically connected to an analog telephone line. (The telephone modem can be external or internal to a cable modem, or a cable modem card in a PC, based on the third-party cable modem vendor.
Configuring Headend Broadband Access Router Features QoS Features QoS Features The Cisco uBR7200 series universal broadband routers support QoS as defined by the DOCSIS 1.0 specification. Service class profiles can be configured through the Cisco CLI to support the QoS profile number, traffic priority, maximum upstream bandwidth, guaranteed upstream bandwidth, maximum downstream bandwidth, maximum transmit burst length, baseline privacy enable/disable, and type of service (ToS) overwrite byte.
Configuring Headend Broadband Access Router Features QoS Features Multiple SIDs provide the following functionality: • Voice traffic can be designated on a higher QoS committed information rate (CIR) secondary SID, while data traffic can be forwarded on a best-effort basis on a primary SID. • Secondary SIDs are higher QoS CIR-type classes to be used for higher priority traffic such as voice. These classes have a nonzero minimum reserved rate (CIR-type service).
Configuring Headend Broadband Access Router Features QoS Features • Source and destination TCP/UDP port numbers • IP protocol type • Type of Service (ToS) field • TCP flags • Source and destination autonomous system numbers • Source and destination subnet masks Tag Switching Tag switching is a Cisco-developed technology that implements a next-generation architecture for the Internet backbone and large intranets.
Configuring Headend Broadband Access Router Features Security Features Weighted Random Early Detection Weighted Random Early Detection (WRED) enables you to specify traffic handling policies to maximize throughput under congestion conditions. Random early detection (RED) works in conjunction with TCP to intelligently avoid network congestion.
Configuring Headend Broadband Access Router Features Security Features DOCSIS Baseline Privacy The Cisco uBR7200 series routers support DOCSIS baseline privacy (BPI). When BPI is enabled, the Cisco uBR7200 series generates Traffic Encryption Keys (TEKs) for each applicable SID. The router uses the keys to encrypt downstream data and decrypt upstream traffic from two-way cable modems. The Cisco uBR7200 series supports both 40-bit and 56-bit encryption/decryption.
Configuring Headend Broadband Access Router Features Traffic Shaping Features Traffic Shaping Features Traffic shaping is a Cisco patent-pending feature that conserves bandwidth by reducing the chances that information will be retransmitted to hosts on the HFC network. Traffic shaping in the upstream direction delays the scheduling of the upstream packet, causing the packet to be buffered on the cable CPE device instead of being dropped.
Configuring Headend Broadband Access Router Features Operations and Provisioning Features Downstream Channel ID Configuration Downstream channel ID configuration allows all cable modems on the HFC network to identify themselves via unique downstream channel IDs instead of their downstream frequencies. Cable modems communicate their downstream ID when making a connection, not their downstream frequency.
Configuring Headend Broadband Access Router Features Spectrum Management Per-Modem and per-Host Access Lists Per-modem and per-host access lists allow Cisco uBR7200 series routers to filter incoming packets from individual hosts or cable modems based on the source MAC or IP address. Access lists can thus be specified on a per-interface or a per-address basis. The packets received from cable modems or individual hosts are filtered based on the cable modem or host from which the packets are received.
Configuring Headend Broadband Access Router Features Headend Broadband Access Router Configuration Prerequisites data. The DOCSIS specification sets the minimum value for both of these parameters to 25 dB in the 5-MHz to 42-MHz frequency range. If the CNR drops below this value on a particular channel due to noise, the cable modem on that channel will drop off of the HFC network. We recommend that system administrators use upstream frequency hopping as a countermeasure to long-term narrowband noise.
Configuring Headend Broadband Access Router Features Headend Broadband Access Router Configuration Tasks – Diplex filters installed in the downstream RF path between the cable modems and the cable modem cards in the Cisco uBR7200 series. Diplex filters are used to convert the single, bidirectional signals used by cable modems to the two separate unidirectional signals used by the cable modem cards.
Configuring Headend Broadband Access Router Features Configuring the Downstream Cable Interface Configuring the Downstream Cable Interface The first step in configuring the Cisco cable modem interface is to configure the downstream cable interface. The downstream direction refers to the data flow from the Cisco cable modem card in a Cisco uBR7200 series to the subscriber’s cable modem.
Configuring Headend Broadband Access Router Features Configuring the Downstream Cable Interface Step 4 Command Purpose CMTS01(config-if)# cable downstream if-output or CMTS01(config-ikf)# no cable downstream if-output Default. Activates downstream digital data from the Cisco uBR7200 series. Deactivates downstream digital data. This command mutes the IF output of the cable modem line card and shuts down the interfaces.
Configuring Headend Broadband Access Router Features Configuring the Downstream Cable Interface • Although some DOCSIS cable modems will search on 250 kHz step size, use of non-NTSC channel plans could significantly increase the cable modem installation time. Note The digital carrier frequency is not the same as the video carrier frequency. For EIA channel 95, the video carrier frequency is 91.250 MHz, which is 1.75 MHz below the center frequency.
Configuring Headend Broadband Access Router Features Configuring the Downstream Cable Interface Setting the Downstream Channel ID To assign a numeric channel ID to the downstream port on the Cisco cable modem card, use the following command in cable interface configuration mode: Command Purpose CMTS01(config-if)# cable downstream channel-id id Specifies the downstream channel ID. Acceptable range is 0 to 255.
Configuring Headend Broadband Access Router Features Configuring the Downstream Cable Interface Verifying the Downstream MPEG Framing Format To verify the downstream MPEG framing format setting, enter the show controllers cable command for the downstream port you have just configured: router# show controllers cable 6/0 downstream Cable6/0 Downstream is up Frequency=96000000, Channel Width 6 MHz, 64-QAM, Symbol Rate 5.056941 Msps FEC ITU-T J.
Configuring Headend Broadband Access Router Features Configuring the Downstream Cable Interface Troubleshooting Tips To troubleshoot the configuration, perform the following tasks: • Make sure the cable connections are not loose or disconnected. • Make sure the Cisco cable modem card is firmly seated in its chassis slot and the captive installation screws are tight. • Make sure you entered the correct slot and port numbers when you typed the command.
Configuring Headend Broadband Access Router Features Configuring the Downstream Cable Interface Setting the Downstream Helper Address Specify an IP address of a DHCP server where UDP broadcast (DHCP) packets will be sent. You can specify a DHCP server for UDP broadcast packets from cable modems and a DHCP server for UDP broadcast packets from hosts.
Configuring Headend Broadband Access Router Features Configuring the Downstream Cable Interface • If the cable modems acquire an RF and a DHCP, but fail on TOD or TFTP: check DHCP options and the IP address of the TOD server; ping the TOD server using the source IP address option (the primary IP address of a cable interface); check IP routing; verify that the TFTP filename is correct, the TFTP file is in the correct directory on the TFTP server, and that the TFTP file has read privileges for all; ping the
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface Verifying Downstream Rate Limiting To verify whether or not downstream rate limiting has been configured and activated, enter the show running-config command and look for the cable interface configuration information. If downstream rate limiting has been configured and enabled, a rate limiting entry will be displayed in the output; if downstream rate limiting is disabled, no rate limiting entry will be displayed.
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface • Activating Upstream Differential Encoding • Activating Upstream Rate Limiting • Activating Upstream Frequency Adjustment • Activating Upstream Power Adjustment • Activating Upstream Timing Adjustment • Activating the Upstream Ports • Setting Upstream Backoff Values Setting the Upstream Frequency The upstream channel frequency of your RF output must be set to comply with the expected input frequency
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface To set a fixed upstream frequency, use the following commands in cable interface configuration mode: Command Purpose Step 1 CMTS01(config-if)# cable upstream usport frequency up-freq-hz Sets a fixed upstream frequency when you enter the fixed center frequency for your upstream RF carrier in Hz. Valid range for usport is from 0 to 5 if you are using the MC16 cable modem card.
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface Setting the Upstream Channel Width Enter the channel width in Hz. Valid values are 200000 Hz (160 kilosymbols per second, or ksps), 400000 Hz (320 ksps), 800000 Hz (640 ksps), 1600000 Hz (1280 ksps), and 3200000 Hz (2560 ksps). The default is 1600000 Hz. Note If you change the channel width, the symbol rate changes accordingly (symbol rate = 1.25 * channel width).
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface • Use a recommended or previously tested modulation profile. It is not uncommon to create a modulation profile that does not allow cable modem-to-headend communication. Because each message type is individually specified, some messages may not work. • Verify with IP ping packets of varying lengths (64 to 1500 bytes) by pinging from the headend to the cable modem.
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface Verifying the Upstream Input Power Level To verify the current value of the upstream input power level, enter the show controllers cable command for the upstream port you have just configured: CMTS01# show controllers cable 6/0 u0 Cable6/0 Upstream 0 is up Frequency 24.016 MHz, Channel Width 0.800 MHz, QPSK Symbol Rate 0.640 Msps Spectrum Group is overridden SNR 33.
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface Troubleshooting Tips To troubleshoot the configuration, perform the following tasks: • Make sure the cable connections are not loose or disconnected. • Make sure the Cisco cable modem card is firmly seated in its chassis slot and the captive installation screws are tight. • Make sure you entered the correct slot and port numbers when you typed the command.
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface Verifying Upstream FEC To verify if FEC is activated or deactivated, enter the more system:running-config command and look for the cable interface configuration information. If FEC is enabled, an FEC entry will be displayed in the show running-config output. If FEC is disabled, no FEC entry will be displayed in the output. The following is an excerpt from the more system:running-config command output.
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface Verifying Upstream Minislot Size To verify upstream minislot size, enter the show controllers cable 6/0 u0 command for the upstream port you have just configured: CMTS01# show controllers cable 6/0 u0 Cable6/0 Upstream 0 is up Frequency 24.016 MHz, Channel Width 1.600 MHz, QPSK Symbol Rate 1.280 Msps Spectrum Group is overridden SNR 33.
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface Caution The upstream scrambler must be activated for normal operation. Disabling it can result in corrupted packets. Disable it only for prototype modems that do not support scrambler. To activate the upstream scrambler after it has been disabled, use the following command in cable interface configuration mode: Command Purpose CMTS01(config-if)# cable upstream usport scrambler Enables the scrambler.
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface Activating Upstream Differential Encoding To enable differential encoding on upstream traffic to a specified cable interface, use the following command in cable interface configuration mode: Command Purpose CMTS01(config-if)# cable upstream usport differential-encoding Enables differential encoding. Upstream differential encoding is disabled by default.
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface To enable upstream rate limiting for an upstream port on a Cisco cable modem card, use one of the following commands in cable interface configuration mode: Step 1 Command Purpose CMTS01(config-if)# cable upstream usport rate-limit Enables rate limiting for the specified upstream cable interface.
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface Step 4 Make the cable modem exceed its peak upstream rate by generating heavy upstream traffic and see the effect of grant buffering (shaping) at the CMTS. If you use cable modem-to-CMTS pings, you will notice the pings slowing down. Let the pings run for a few minutes (to let averages at CMTS settle); then see the upstream rate received by this single modem.
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface Verifying Upstream Frequency Adjustment To verify whether or not upstream frequency adjustment has been configured and activated, enter the show running-config command and look for the cable interface configuration information. If upstream frequency adjustment is enabled, frequency adjustment entries will be displayed in the show running-config output.
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface To return the automatic upstream power adjustment noise value to the default of 30 percent, enter the following command in cable interface configuration mode: CMTS01(config-if)# no cable upstream usport power-adjust noise To return the upstream power adjustment threshold value to the default of 1 dB, enter the following command in cable interface configuration mode: CMTS01(config-if)# no cable upstream usport pow
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface To return the upstream time adjustment ranging value to the default of 2 seconds, enter the following command in cable interface configuration mode: CMTS01(config-if)# no cable upstream usport time-adjust continue To return the upstream time adjustment threshold value to the default of 1 second, enter the following command in cable interface configuration mode: CMTS01(config-if)# no cable upstream usport time-adj
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface To activate the upstream ports, use the following commands beginning in global configuration mode: Command Purpose Step 1 CMTS01(config)# interface cable slot/port Specifies a cable interface and enters cable interface configuration mode. Step 2 CMTS01(config-if)# no cable upstream usport shutdown Enables upstream data traffic.
Configuring Headend Broadband Access Router Features Configuring the Upstream Cable Interface You can set fixed start and end values for data backoff on the upstream ports, or you can set the upstream ports for automatic data backoff. You have the same options for ranging backoff. For both backoff windows, the default start value is 0; the default end value is 4. Valid values are from 0 to 15.
Configuring Headend Broadband Access Router Features Configuring and Activating Baseline Privacy Verifying Upstream Data Backoff Automatic To verify backoff window settings, enter the show controllers cable 6/0 u0 command for the upstream port you have just configured: CMTS01# show controllers cable 6/0 u0 Cable6/0 Upstream 0 is up Frequency 24.016 MHz, Channel Width 1.600 MHz, QPSK Symbol Rate 1.280 Msps Spectrum Group is overridden SNR 33.
Configuring Headend Broadband Access Router Features Configuring and Activating Baseline Privacy A KEK is assigned to a cable modem based on the cable modem SID and permits the cable modem to connect to the Cisco uBR7200 series when baseline privacy is activated. The TEK is assigned to a cable modem when its KEK has been established. The TEK is used to encrypt data traffic between the cable modem and the Cisco uBR7200 series. KEKs and TEKs can be set to expire based on a grace-time or a life-time value.
Configuring Headend Broadband Access Router Features Configuring and Activating Baseline Privacy Verifying KEK Privacy To verify the KEK life-time or grace-time values that have been set, enter the show cable privacy kek command: CMTS01# show cable privacy kek Configured KEK life time value = 750000 Configured KEK grace time value = 800 Troubleshooting Tips To troubleshoot the configuration, make sure you have entered a valid value for grace time or life time.
Configuring Headend Broadband Access Router Features Configuring and Activating Frequency Agility Activating Baseline Privacy After the KEK and TEK values have been set, activate encryption on the HFC network by using the following commands in cable interface configuration mode: Command Purpose Step 1 CMTS01(config-if)# cable privacy enable Activates cable privacy. This is the default.
Configuring Headend Broadband Access Router Features Configuring and Activating Frequency Agility Figure 109 Sparse Versus Dense Segment Illustrations Sparse Segment 3 Segment 4 Segment 1 DS DS US0 US0 US1 US1 US2 US2 US3 US3 US4 US4 US5 US5 1x4 CM card 1x4 CM card Segment 2 Segment x Optical receiver = attenuator x attenuator Segment 5 Segment 6 27979 Dense Cable modems Reverse optical Fiber-optic transmitter cable Distribution network As shown in Figure 109, the downstream segment can c
Configuring Headend Broadband Access Router Features Configuring and Activating Frequency Agility Frequency Management Policy Upstream port frequency should be set to a fixed value during system installation and testing. This value is chosen from the allocation plan for the RF domain for the RF plant segment connected to the upstream.
Configuring Headend Broadband Access Router Features Configuring and Activating Frequency Agility • Configuring Spectrum Group Characteristics • Assigning the Spectrum Group and the Upstream Ports Determining the Upstream Ports Assigned to a Combiner Group Following is an example topology for a Cisco uBR7223 with combiner groups designated A through J. Combiner groups C and E have multiple upstream ports that should be configured in a shared spectrum group.
Configuring Headend Broadband Access Router Features Configuring and Activating Frequency Agility Creating Spectrum Groups To create a spectrum group, use one of the following commands in global configuration mode: Command Purpose CMTS01(config)# cable spectrum-group group-number type blind Creates a blind spectrum group. or CMTS01(config)# cable spectrum-group group-number type scheduled daily Creates a scheduled spectrum group that can change its frequency and power level at the same time every day.
Configuring Headend Broadband Access Router Features Configuring and Activating Frequency Agility To configure and activate a spectrum group, use one of the following commands in global configuration mode: Command Purpose CMTS01(config)# cable spectrum-group group-number [time day hh:mm:ss] [delete] frequency ctr-freq-hz [power-level-dbmv] Adds the upstream frequency to the list of valid frequencies with a default power level for a spectrum group.
Configuring Headend Broadband Access Router Features Configuring and Activating Frequency Agility The following example enables spectrum management for all upstream ports, assuming that all combiner groups use the frequency band from 20 to 26 MHz: CMTS01(config)# cable spectrum-group 1 band 20000000 26000000 CMTS01(config)# cable spectrum-group 2 shared CMTS01(config)# cable spectrum-group 2 band 20000000 26000000 CMTS01(config)# cable spectrum-group 3 shared CMTS01(config)# cable spectrum-group 3 band 200
Configuring Headend Broadband Access Router Features Configuring and Activating Frequency Agility Note There are no alternate frequency assignments for either port and bandwidth is wasted from 24.8 to 26.0 MHz. To create alternate channels, increase the upper boundary from 26.0 to 28.0 MHz. > Channel > > 1 > 2 > 3 > 4 > 5 > 6 > 7 Width Start Stop Center (Mhz) (Mhz) (Mhz) (Mhz) 3.2 20.0 23.2 21.6 3.2 23.2 26.4 24.8 1.6 20.0 21.6 20.8 1.6 21.6 23.2 22.4 1.6 23.2 24.8 24.0 1.6 24.8 26.4 25.6 1.6 26.4 28.
Configuring Headend Broadband Access Router Features Configuring and Activating Frequency Agility If you do not have an RF tone generator, use another line card and modem that carries traffic. Connect the upstream to the same combiner group, and use the data carrier as an interfering signal by setting it to the same frequency. For example, to test frequency hopping on c3/0, install c4/0 and connect both upstreams together using a combiner. If the upstream frequency of c3/0 is 22.4 MHz, set c4/0 to 22.
Configuring Headend Broadband Access Router Features Configuring and Activating Frequency Agility To adjust the frequency hop threshold percentage or the minimum period between frequency hops, use the following commands in global configuration mode: Command Purpose Step 1 CMTS01(config)# cable spectrum-group groupnum hop threshold percent Sets the percentage of all cable modems losing keepalive messages (going offline) that will cause a frequency hop.
Configuring Headend Broadband Access Router Features Activating IP Address Resolution Protocol Assigning the Spectrum Group and the Upstream Ports To configure a frequency hop table after you have determined which upstream ports you want assigned to a combiner group, use the following commands: Command Purpose Step 1 CMTS01(config)# interface cable slot/port Enters cable interface configuration mode for the interface to which you wish to assign a spectrum group.
Configuring Headend Broadband Access Router Features Activating Host-to-Host Communication (Proxy ARP) Verifying ARP Requests To verify whether or not cable ARP has been activated, enter the more system:running-config command and look for the cable interface configuration information. If ARP has been activated, it does not appear in this output.
Configuring Headend Broadband Access Router Features Configuring DHCP Options Activating Cable Proxy ARP Requests To activate cable proxy ARP for host-to-host communications, use the following command in cable interface configuration mode: Command Purpose CMTS01(config-if)# cable proxy-arp Enables proxy ARP on the cable interface. This is the default.
Configuring Headend Broadband Access Router Features Configuring DHCP Options With the cable relay agent activated, the Cisco uBR7200 series will insert the cable modem MAC address into a DHCP packet when a packet is received from a cable modem or another host. The Cisco uBR7200 series will then forward the packet to a DHCP server.
Configuring Headend Broadband Access Router Features Setting Service Options Troubleshooting Tips To troubleshoot the configuration, perform the following tasks: • Make sure you entered the correct port and cable modem card slot number when you activated DHCP giaddr. • A DOCSIS-based DHCP server is required. The DHCP server verifies that the “fixed” IP address, if any, returned to the host is valid for the IP subnet on that downstream interface.
Configuring Headend Broadband Access Router Features Setting Optional IP Parameters Activating IP Multicast Echo The Cisco uBR7200 series echoes IP multicast packets by default. To activate IP multicast echo if it has been previously disabled, use the following command in cable interface configuration mode: Command Purpose CMTS01(config-if)# cable ip-multicast-echo Enables IP multicast echo. This is the default.
Configuring Headend Broadband Access Router Features Configuring Cable Profiles To disable IP broadcast echo (the default setting), enter the no cable ip-broadcast-echo command in cable interface configuration mode.
Configuring Headend Broadband Access Router Features Configuring Cable Profiles The following modulation profile values can be changed: • Interval usage code (iuc)—Valid values are initial, long, reqdata, request, short, and station. • Fec-tbytes—The number of bytes that can be corrected per FEC codeword. Valid range is 0 to 10 bytes, where 0 means no FEC. • Fec-len—FEC codeword length. Valid range is 8 to 254 bits. • Burst-len—Maximum burst length in bytes.
Configuring Headend Broadband Access Router Features Configuring Cable Profiles Verifying Cable Modulation Profiles To verify whether or not a cable modulation profile has been created and to see how it is configured, enter the show cable modulation-profile command: CMTS01# show cable modulation-profile Mo IUC Type Preamb Diff FEC err FEC length enco correct T Max B 1 1 1 1 1 0 0 0 request initial station short qpsk qpsk qpsk qpsk 64 128 128 72 no no no no 0x0 0x5 0x5 0x5 Scrambl seed bytes 0x10 0
Configuring Headend Broadband Access Router Features Configuring Cable Profiles Command Purpose Step 5 CMTS01(config)# cable qos-profile groupnum max-upstream rate Sets the maximum upstream data rate in kbps that a cable modem using this QoS profile will send. Valid values are from 0 to 100000 kbps. Default = 0 (no upstream rate limit.
Configuring Headend Broadband Access Router Features Configuring Cable Profiles Setting QoS Permission The Cisco uBR7200 series router supports the creation of QoS table entries by SNMP or by cable modem registration requests. You can also configure the Cisco uBR7200 series to dynamically update QoS table entries via SNMP.
Configuring Headend Broadband Access Router Features Managing Cable Modems on the HFC Network Verifying a QoS Profile Assignment To verify a QoS profile assignment, perform the following steps: Step 1 Load the Cisco uBR7200 series and wait for the cable modems to come online as indicated by the show cable modem command. Notice that the modems are getting their provisioned class of service as indicated by the show cable modem and show cable qos profile commands.
Configuring Headend Broadband Access Router Features Managing Cable Modems on the HFC Network Configuring Sync Message Interval To specify the interval between successive sync message transmissions from the Cisco uBR7200 series, use the following command in cable interface configuration mode: Command Purpose CMTS01(config-if)# cable sync-interval msec Specifies the interval in milliseconds (ms) between successive sync message transmissions from the Cisco uBR7200 series.
Configuring Headend Broadband Access Router Features Managing Cable Modems on the HFC Network Command Purpose CMTS01(config-if)# cable shared-secret [0 | 7] authentication-key Enables cable modem authentication. The number 0 specifies that an unencrypted authentication key follows; the number 7 specifies that an encrypted authentication key follows.
Configuring Headend Broadband Access Router Features Managing Cable Modems on the HFC Network To activate cable modem upstream address verification, use the following command in cable interface configuration mode: Command Purpose CMTS01(config-if)# cable source-verify [dhcp] Activates cable modem upstream verification. The dhcp option specifies that queries will be sent to verify unknown IP addresses in upstream data packets.
Configuring Headend Broadband Access Router Features Managing Cable Modems on the HFC Network modem to join the network is known as initial ranging. The default insertion interval setting (automatic) configures the Cisco uBR7200 series to automatically vary the initial ranging times available to new cable modems that attempt to join the network.
Configuring Headend Broadband Access Router Features Managing Cable Modems on the HFC Network Troubleshooting Tips To troubleshoot the configuration, make sure that you entered the correct slot and port numbers when you typed the command.
Configuring Headend Broadband Access Router Features Managing Cable Modems on the HFC Network Command Purpose CMTS01(config-if)# cable registration-timeout n Specifies the maximum number of minutes that can elapse with no upstream activity before a cable modem is declared inactive and the connection terminated. Valid range is from 2 to 60 minutes. Default = 3 minutes.
Configuring Headend Broadband Access Router Features Managing Cable Modems on the HFC Network Command Purpose CMTS01(config-if)# clear cable modem mac-addr reset Removes the cable modem with a specific MAC address from the Station Maintenance List and resets it. ip-addr reset Removes the cable modem with a specific IP address from the Station Maintenance List and resets it.
Configuring Headend Broadband Access Router Features Headend Broadband Access Router Configuration Examples Verifying that Cable Modem Counters are Cleared To verify whether the counters in the Station Maintenance List have been cleared, enter the show cable flap list command. The station maintenance list counter will be 0. CMTS01# show cable flap list Troubleshooting Tips To troubleshoot the configuration, make sure you entered the correct cable modem MAC address or IP address when you typed the command.
Configuring Headend Broadband Access Router Features Headend Broadband Access Router Configuration Examples Spectrum Management Configuration Example In the following example, the Cisco uBR7200 series is configured to support spectrum management and modulation profiles. ! version 12.1 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname uBR7246 ! boot system flash slot0:ubr7200-p-mz.120-4.
Configuring Headend Broadband Access Router Features Headend Broadband Access Router Configuration Examples ! ! router eigrp 100 network 10.0.0.0 ! ip classless no ip http server ! ! ! line con 0 password cisco login transport input none line aux 0 line vty 0 4 password cisco login ! end Virtual Private Network Configuration Example VPN support enables you to offer private network connections to telecommuters and other business-oriented customers.
Configuring Headend Broadband Access Router Features Headend Broadband Access Router Configuration Examples ip subnet-zero ip host abrick 223.255.254.254 ! ! ! interface FastEthernet0/0 ip address 10.30.0.1 255.255.0.0 no ip directed-broadcast full-duplex no cdp enable ! interface FastEthernet1/0 ip address 10.31.0.1 255.255.0.0 ip helper-address 10.0.0.101 no ip directed-broadcast full-duplex no cdp enable ! interface Ethernet2/0 ip address 10.32.0.1 255.255.0.
Configuring Headend Broadband Access Router Features Headend Broadband Access Router Configuration Examples cable upstream 4 frequency 18000000 cable upstream 4 power-level 0 no cable upstream 4 shutdown cable upstream 5 frequency 18000000 cable upstream 5 power-level 0 no cable upstream 5 shutdown ! interface Cable4/0 no ip address no ip directed-broadcast no keepalive shutdown cable downstream annex B cable downstream modulation 64qam cable downstream interleave-depth 32 cable upstream 0 shutdown cable u
Configuring Headend Broadband Access Router Features Headend Broadband Access Router Configuration Examples VoIP Configuration Example Following is a sample VoIP configuration file for a Cisco uBR7200 series cable router: Caution In certain countries, the provisioning of voice telephony over the Internet may be prohibited or subject to laws, regulations, or licenses, including requirements applicable to the use of the products under telecommunications and other laws and regulations; you must comply with
Configuring Headend Broadband Access Router Features Headend Broadband Access Router Configuration Examples ! ! ! ip subnet-zero no ip domain-lookup ip host abrick 223.255.254.254 ip host muck 255.255.255.255 ip host keyer 223.255.254.254 ip host bell 223.255.254.253 ! ! ! interface FastEthernet0/0 ip address 2.2.2.2 255.255.255.0 no ip directed-broadcast no ip mroute-cache shutdown ! interface Ethernet1/0 ip address 1.11.8.1 255.255.0.0 ip broadcast-address 1.11.255.255 ip helper-address 223.255.254.
Configuring Headend Broadband Access Router Features Headend Broadband Access Router Configuration Examples ! ! line con 0 exec-timeout 0 0 transport input none line aux 0 line vty 0 4 login line vty 5 11 login ! end Telco Return Configuration Example Following is a sample configuration file displaying critical elements of a telco return network configuration for the Cisco uBR7200 series, including the following: Note • AAA configuration • Telco return-specific configuration • SNMP server-specific
Configuring Headend Broadband Access Router Features Headend Broadband Access Router Configuration Examples ip address 24.1.2.246 255.255.255.0 no ip directed-broadcast ! interface FastEthernet0/0 no ip address no ip directed-broadcast shutdown media-type MII full-duplex ! interface Hssi1/0 ip unnumbered Loopback0 no ip directed-broadcast ! interface Cable3/0 ip address 10.1.1.1 255.255.255.0 no ip directed-broadcast ip helper-address 24.1.1.
Configuring Headend Broadband Access Router Features Headend Broadband Access Router Configuration Examples ! radius-server host 24.1.1.78 auth-port 1645 acct-port 1646 radius-server key radius_server_key ! line con 0 password No need to change; this is encrypted already. transport input none flowcontrol software line aux 0 password No need to change; this is encrypted already. flowcontrol hardware line vty 0 4 password No need to change; this is encrypted already.
Configuring Headend Broadband Access Router Features Troubleshooting Using Cable Flap Lists Troubleshooting Using Cable Flap Lists A cable flap list is a table maintained by the Cisco uBR7200 series for every cable modem (active or not active) that is having difficulties communicating with the headend. Flapping refers to the rapid disconnecting and reconnecting of a cable modem. The flap list contains cable modem MAC addresses and logs the time of the most recent activity.
Configuring Headend Broadband Access Router Features Troubleshooting Using Cable Flap Lists Verifying Cable Flap List Aging To verify that cable flap list aging is set, enter the show cable flap list command: CMTS01# show cable flap list Mac Addr CableIF Ins 0010.7b6b.5d1d C3/0 U0 0 0010.7b6b.5e15 C3/0 U0 1 0010.7b6b.5e27 C3/0 U0 1 0010.7b6b.5d29 C3/0 U0 1 0010.7b6b.
Configuring Headend Broadband Access Router Features Troubleshooting Using Cable Flap Lists Command Purpose CMTS01(config)# cable flap-list power-adjust threshold dbmv Specifies the minimum power adjustment that will constitute a flap list event. Verifying Cable Flap List Power Adjustment Threshold To verify the cable flap list power adjustment threshold, enter the show cable flap list command: CMTS01# show cable flap list Mac Addr CableIF Ins 0010.7b6b.5d1d C3/0 U0 0 0010.7b6b.5e15 C3/0 U0 1 0010.
Configuring Headend Broadband Access Router Features Troubleshooting Using Cable Flap Lists Setting Cable Flap List Size You can specify the maximum number of cable modems that can be listed in the cable flap list tables. The valid range is from 1 to 8192 cable modems. The default is 8192 cable modems.
