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Table Of Contents
Cisco uBR7246 Universal Broadband Router Features
Description of Cisco uBR7246 Cable Router
Universal Broadband Features Configuration Task List
Configure the Downstream Cable Interface
Set the Downstream Center Frequency
Verify the Downstream Center Frequency
Set the Downstream Symbol Rate
Verify the Downstream Symbol Rate
Set the Downstream MPEG Framing Format (Annex A or Annex B)
Verify the Downstream MPEG Framing Format (Annex A or Annex B)
Verify the Downstream Modulation
Set the Downstream Interleave Depth
Verify the Downstream Interleave Depth
Activate the Downstream Carrier
Configure the Upstream Cable Interface
Set the Upstream Input Power Level
Verify the Upstream Input Power Level
Activate Upstream Forward Error Correction
Verify Upstream Forward Error Correction
Activate the Upstream Scrambler
Configure and Activate Baseline Privacy
Configure Kek Encryption Key Privacy
Verify Key Encryption Key Privacy
Configure Traffic Encryption Key Privacy
Verify Traffic Encryption Key Privacy
Verify Baseline Privacy Activation
Configure and Activate Frequency Agility
Verify Spectrum Group Creation
Configure and Activate Spectrum Groups
Verify Spectrum Group Configuration and Activation
Activate IP Address Resolution Protocol
Activate Address Resolution Protocol Requests
Activate Host-to-Host Communication (Proxy ARP)
Verify IP Multicast Echo Activation
Verify IP Broadcast Echo Activation
Manage Cable Modems on the HFC Network
Activate Cable Modem Authentication
Verify Cable Modem Authentication
Activate Cable Modem Upstream Address Verification
Verify Cable Modem Upstream Verification
Activate Cable Modem Insertion Interval
Verify Cable Modem Insertion Interval
Universal Broadband Features Configuration Example
cable downstream interleave-depth
cable spectrum-group frequency
show interface cable signal-quality
Cisco uBR7246 Universal Broadband Router Features
Feature Summary
Cisco uBR7246 universal broadband features enable the Cisco uBR7246 universal broadband router to communicate with a hybrid fiber coaxial (HFC) cable network via a Cisco MC11 cable modem card. Cisco MC11 cable modem cards allow you to connect cable modems on the HFC network to a Cisco uBR7246 in a Community Antenna Television (CATV) headend facility. The modem card provides the interface between the Cisco uBR7246 protocol control information (PCI) bus and the radio frequency (RF) signal on the HFC network.
The MC11 cable modem cards consist of the following components:
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One downstream cable F-connector port—The downstream port supports quadrature amplitude modulation (QAM) speeds of 64-QAM, or 6 bits per symbol. A symbol is the basic unit of modulation in CATV systems.
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You must install at least one Cisco MC11 cable modem card in the Cisco uBR7246 chassis to establish communication between the Cisco uBR7246 and the HFC network.
shows the network topology for the modem card and illustrates network connections using the Cisco uBR7246.
Figure 1 Topology for uBR7246 Universal Broadband
Description of Cisco uBR7246 Cable Router
As shown in , the Cisco uBR7246 serves as an interface between a WAN backbone and an HFC cable plant. Typically installed at a CATV headend, the Cisco uBR7246 is often colocated with the following internet service provider-related components.
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The Ethernet switch is used to reduce traffic on the WAN backbone.
The proxy server usually functions as a Web cache for host computers, and the DHCP/TFTP server for cable modems. DHCP for host computers in the HFC plant is often handled over the WAN. The WAN router provides a gateway to the data network.
On the RF side, the downstream port is assigned a 6-8 MHz channel slot at a standard broadcast CATV frequency. An upconverter device is used to convert the 44 MHz intermediate frequency (IF) output to the assigned slot. In North America, carrier frequencies in the forward plant are assigned between 54-860 MHz. After upconversion, the signal is combined with other analog TV or digital TV signals and sent to the transmit input of a fiber transceiver.
The receive input of the fiber transceiver is connected to an upstream port of the Cisco uBR7246. The upstream port is assigned a 0.2-3.2 MHz frequency band in the reverse plant. In North America, carrier frequencies in the reverse plant are between 5-42 MHz.
The fiber transceiver is connected to up to 80 kilometers of optical fiber. Signals are carried in analog form to a neighborhood where they terminate in a fiber node. The fiber node, located on a telephone pole or in an underground box, converts the optical signal back to an electrical signal which is passed on to a two-way, distribution amplifier system. The distribution amplifier system passes through the neighborhood where it is tapped off to individual CATV subscribers. Typically, there are 500-1500 homes passed per fiber node.
A coaxial cable delivers the signal from the tap to a subscriber's drop box. From the drop box, the signal is split and cabled to consumer CATV appliances. In addition to analog or digital television, the subscriber obtains data services using a cable modem appliance, like the Cisco uBR904 cable modem.
Benefits of Cisco uBR7246
The Cisco uBR7246 features bring value to the digital broadband network by:
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The Cisco uBR7246 cable modem cards are fully compatible with the Data Over Cable System Interface Specification (DOCSIS) established by major North American cable operators through the Multimedia Cable Network System (MCNS) consortium.
The Cisco uBR7246 supports both two-way and telephone return modems on a single downstream channel. The Cisco uBR7246 therefore allows both one-way and two-cable plants to provide cable modem service, and gives cable operators the flexibility to roll out service in systems that are only partially upgraded to two-way.
List of Terms
Community Antenna Television (CATV)—Broadband transmission facility.
Downstream—Frequency multiplexed band in a CATV channel that distributes signals from headend to users. In this instance, downstream refers to the data flow from the Cisco MC11 modem card in a Cisco uBR7246 to the user's cable modem.
Headend—Originating point of a signal in a Cable TV system.
Intermediate Frequency (IF)—Intermediate electromagnetic frequencies generated by a superheterodyne radio receiver.
Hybrid Fiber Coaxial Cable (HFC)—Distribution cabling concept using both fiber optic and coaxial cable. Fiber is used for the backbone distribution medium, terminating in a remote unit where optoelectrical conversion takes place. The signal is then passed as data to coaxial cables that carry it to its destination.
Quadrature Amplitude Modulation (QAM)—Modulation technique that allows data-encoded symbols to be represented in 16 or 32 different states.
Quaternary Phase Shift Keying (QPSK)—Compression technique used in modems and wireless networks, allowing the transmission of 2 bits per symbol. QPSK provides a 2:1 compression ratio, resulting in double efficiency for the circuit being used.
Radio Frequency (RF)—Group of electromagnetic energy whose wavelengths are between the audio and light range, usually between 500 KHz and 300 GHz.
Symbol—Phase range of a sine wave.
Upstream—Frequency multiplexed band in a CATV channel that distributes signals from transmitting stations to headend. In this instance, upstream refers to the data flow from a cable modem to the Cisco MC11 modem card in a Cisco uBR7246.
Platforms
This feature is supported only on the Cisco uBR7246. The access unit installed in the subscriber's location is the Cisco uBR904 Cable Modem. Other compatible cable modems may also be used.
Prerequisites
Before you can configure Cisco uBR7246 universal broadband router features, you must first:
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For information about installing and configuring the 4-port 10BASE-T port adapter, refer to the 4-E Ethernet 10BASE-T Port Adapter Installation and Configuration document.
For information about installing and configuring the 8-port 10BASE-T port adapter, refer to the 8-E Ethernet 10BASE-T Port Adapter Installation and Configuration document.
For information about installing and configuring the 100BASE-T Fast Ethernet port adapter, refer to the 100BASE-T Fast Ethernet Port Adapter Installation and Configuration document.
For information about installing and configuring the ATM port adapter, refer to the ATM Port Adapter Installation and Configuration document.
For information about installing and configuring the HSSI port adapter, refer to the HSSI Port Adapter Installation and Configuration document.
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Supported MIBs and RFCs
The Cisco uBR7246 universal broadband features support the RF Interface Management Information Base (MIB). For descriptions of supported MIBs and how to use MIBs, see Cisco's MIB website on CCO at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml. No RFCs are supported by this feature.
Universal Broadband Features Configuration Task List
The Cisco IOS software command-line interface (CLI) is used to configure the Cisco MC11 cable modem card for correct operation on the HFC network. Perform the following tasks to configure the MC11 cable modem card. For some tasks, the default values are adequate to configure the device; these configuration tasks are optional.
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Configure the Downstream Cable Interface
The first step in configuring the MC11 cable modem interface is to configure the downstream cable interface. In this case, downstream refers to the data flow from the Cisco MC11 modem card in a Cisco uBR7246 to the user's cable modem. Data passing through the MC11 cable modem card is converted to IF and then run through an upconverter to transform the signal to RF. This RF signal is then sent down the line to the user's cable modem. Downstream cable interface commands configure the frequency, symbol rate, compression, and modulation of the downstream signal.
Perform the following tasks to configure the downstream cable interface:
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Set the Downstream Center Frequency
You need to set the downstream frequency of your RF output to comply with the expected input frequency of your upconverter. To do this, enter the fixed center frequency of the downstream RF carrier for a downstream port.
Downstream frequency is an information-only command that should reflect the digital carrier frequency, which is the center frequency of the downstream RF carrier (the channel) for that downstream port. The configuration controlling the digital carrier frequency is done in the IF-to-RF upconverter that must be installed in the downstream path from the Cisco uBR7246. Refer to the upconverter's manufacturer's instructions for information about configuring the upconverter.
The digital carrier frequency is specified to be the center of a 6.0 MHz channel. For example, EIA channel 95 spans 90.000 to 96.000 MHz. The center frequency is 93.000 MHz, which is the digital carrier frequency that should be configured as the downstream frequency.
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To set the downstream center frequency, use the following command in cable interface configuration mode:
cable downstream frequency down-freq-hz
Enter the fixed center frequency for your downstream RF carrier in Hz.
Verify the Downstream Center Frequency
To verify the current value of the center frequency, enter the show controllers cable command for the downstream port that you have just configured:
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router# show controllers cable 6/0 downstreamCable6/0 Downstream is upFrequency=96000000, Channel Width 6 MHz, 64-QAM, Symbol Rate 5.056941 MspsFEC ITU-T J.83 Annex B, R/S Interleave I=32, J=4•
router# show controllers cable 6/0 downstreamCable6/0 Downstream is upFrequency is not set. Channel Width 6 MHz, 64-QAM, Symbol Rate 5.056941 MspsFEC ITU-T J.83 Annex B, R/S Interleave I=32, J=4Tips
If you are having trouble:
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Set the Downstream Symbol Rate
You need to set the megasymbols per second (Msps) rate for a downstream port on a cable modem card. A symbol is the basic unit of modulation. QPSK encodes 2 bits per symbol, 16-QAM encodes 4 bits per symbol, 64-QAM encodes 6 bits per symbol, and 256-QAM encodes 8 bits per symbol. The valid range for the downstream symbol rate is 0 to 6,000,000 Msps.
CautionThe default downstream symbol rate is set to comply with MCNS specifications for Annex B cable modem support at 5.056941 Msps with 64-QAM modulation and 5.36037 Msps with 256-QAM modulation. This command should only be used to change the symbol rate to support Annex A cable modems that are used outside North America.
To set the downstream symbol rate, use the following command in cable interface configuration mode:
cable downstream symbol-rate number
Set the downstream symbol rate for Annex A (5.056944 Msps). Do not enter the decimal point in the symbol rate.
Verify the Downstream Symbol Rate
To verify the downstream symbol rate, enter the show controllers cable command for the downstream port that you have just configured:
router# show controllers cable 6/0 downstreamCable6/0 Downstream is upFrequency=96000000, Channel Width 6 MHz, 64-QAM, Symbol Rate 5.056941 MspsFEC ITU-T J.83 Annex B, R/S Interleave I=32, J=4Tips
If you are having trouble:
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Set the Downstream MPEG Framing Format (Annex A or Annex B)
The MPEG framing format must be compatible with the downstream symbol rate you set. Set the MPEG framing format for a downstream port on a cable modem card to either Annex A or Annex B.
Annex B is the North America standard and Annex A is the European standard. You should review your local standards and specifications for downstream MPEG framing to determine which format you should use.
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To set the downstream MPEG framing format, use the following command in cable interface configuration mode:
Verify the Downstream MPEG Framing Format (Annex A or Annex B)
To verify the downstream MPEG framing format (Annex A or Annex B) setting, enter the show controllers cable command for the downstream port that you have just configured:
router# show controllers cable 6/0 downstreamCable6/0 Downstream is upFrequency=96000000, Channel Width 6 MHz, 64-QAM, Symbol Rate 5.056941 MspsFEC ITU-T J.83 Annex B, R/S Interleave I=32, J=4Tips
If you are having trouble:
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Set the Downstream Modulation
Downstream modulation is the number of symbols per second; by setting the downstream modulation, you define the speed at which data travels downstream to the user, which is 64 qam (6 bits per downstream symbol rate).
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To set the downstream modulation, use the following command in cable interface configuration mode:
Verify the Downstream Modulation
To verify the downstream modulation setting, enter the show controllers cable command for the downstream port that you have just configured:
router# show controllers cable 6/0 downstreamCable6/0 Downstream is upFrequency=96000000, Channel Width 6 MHz, 64-QAM, Symbol Rate 5.056941 MspsFEC ITU-T J.83 Annex B, R/S Interleave I=32, J=4Tips
If you are having trouble:
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Set the Downstream Interleave Depth
The next step is to set the interleave depth for a downstream port on a cable modem card. A higher interleave depth provides more protection from bursts of noise on the HFC network; however, it will increase downstream latency. The valid values are 8, 16, 32 (default), 64, and 128.
To set the downstream interleave depth, use the following command in cable interface configuration mode:
cable downstream interleave-depth {8 | 16 | 32 | 64 | 128}
Set the downstream interleave depth.
Verify the Downstream Interleave Depth
To verify the downstream interleave depth setting, enter the show controllers cable command for the downstream port that you have just configured:
router# show controllers cable 6/0 downstreamCable6/0 Downstream is upFrequency=96000000, Channel Width 6 MHz, 64-QAM, Symbol Rate 5.056941 MspsFEC ITU-T J.83 Annex B, R/S Interleave I=32, J=Tips
If you are having trouble:
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Activate the Downstream Carrier
To activate a downstream port on a cable modem card for digital data transmissions over the HFC network, use the following commands in global configuration mode:
Verify the Downstream Carrier
To verify that the downstream carrier is active (up), enter the show controllers cable command for the downstream port that you have just configured:
router# show controllers cable 6/0 downstreamCable6/0 Downstream is upFrequency=96000000, Channel Width 6 MHz, 64-QAM, Symbol Rate 5.056941 MspsFEC ITU-T J.83 Annex B, R/S Interleave I=32, J=4Tips
If you are having trouble with this configuration:
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Configure the Upstream Cable Interface
The next step is to configure the upstream cable interface. In this case, upstream refers to the data flow from a cable modem to the Cisco MC11 modem card in a Cisco uBR7246. The user's cable modem sends an RF signal back to the MC11 cable modem card, which translates the RF signal back to data format. Upstream cable interface commands configure the frequency and input power level of the upstream signal, in addition to error detection and correction of the upstream signal.
The configuration of the upstream cable interface depends on each cable operator's physical plant.
Perform the following tasks to configure the upstream cable interface:
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Set the Upstream Frequency
You need to set the upstream frequency of your RF output to comply with the expected input frequency of your Cisco MC11 cable modem. You do this by entering a fixed frequency of the upstream RF carrier for an upstream port. The valid range for a fixed upstream frequency is 5,000,000 Hz to 42,000,000 Hz.
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To set the upstream frequency, use the following command in cable interface configuration mode:
cable upstream port frequency up-freq-hz
Enter the fixed center frequency for your upstream RF carrier in Hz.
Verify the Upstream Frequency
To verify the current value of the upstream frequency, enter the show controllers cable command for the upstream port that you have just configured:
router# show controllers cable 6/0 u0Cable6/0 Upstream 0 is upFrequency 7.008 MHz, Channel Width 1.6 MHz, QPSK Symbol Rate 1.280 MspsNominal Input Power Level 0 dBmV, Tx Timing Offset 0Ranging Backoff Start 0, Ranging Backoff End 4, Tx Backoff Start 0Tx Backoff End 4, Modulation Profile Group 1part_id=0x3136, rev_id=0x02, rev2_id=0x61nb_agc_thr=0x0100, nb_agc_nom=0x3000Range Load Reg Size=0x58Request Load Reg Size=0x0CMinislot Size in number of Timebase Ticks is = 8Minislot Size in Symbols =64Minislot Size in Bytes = 16UCD Count = 361894DES Reg #580 = E204301, #584 = 3E030303, #588 = 0.#590 = C0C0C0C.Tips
If you are having trouble:
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Set the Upstream Input Power Level
The uBR7246 controls the output power levels of the cable modems to meet the desired upstream input power level. The default setting of 0 dBmV is the optimal setting for the upstream power level.
CautionIf you increase the input power level, the cable modems on your HFC network will increase their transmit power level. This might cause an increase in the carrier-to-noise ratio (CNR) on the network. Be careful if you adjust this parameter. You might violate the upstream return laser design parameters.
To set the upstream input power level, use the following command in cable interface configuration mode:
Verify 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 that you have just configured:
router# show controllers cable 6/0 u0Cable6/0 Upstream 0 is upFrequency 7.008 MHz, Channel Width 1.6 MHz, QPSK Symbol Rate 1.280 MspsNominal Input Power Level 0 dBmV, Tx Timing Offset 0Ranging Backoff Start 0, Ranging Backoff End 4, Tx Backoff Start 0Tx Backoff End 4, Modulation Profile Group 1part_id=0x3136, rev_id=0x02, rev2_id=0x61nb_agc_thr=0x0100, nb_agc_nom=0x3000Range Load Reg Size=0x58Request Load Reg Size=0x0CMinislot Size in number of Timebase Ticks is = 8Minislot Size in Symbols = 64Minislot Size in Bytes = 16UCD Count = 361894DES Reg #580 = E204301, #584 = 3E030303, #588 = 0.#590 = C0C0C0C.Tips
If you are having trouble:
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Activate Upstream Forward Error Correction
The Cisco uBR7246 uses forward error correction (FEC) to attempt to correct any upstream data that might have been corrupted. FEC is activated by default and should not be disabled. When FEC is activated, all cable modems on the network also activate FEC.
To activate the upstream forward error correction, use the following command in cable interface configuration mode:
Verify Upstream Forward Error Correction
To verify if FEC is activated or deactivated, enter the command more system:running-config and look for the cable interface configuration information. The following is an excerpt from the more system:running-config command output.
router#more system:running-configBuilding configuration...!interface Cable6/0ip address 1.1.1.1 255.255.255.0no keepalivecable insertion-interval 150000cable downstream annex Bcable downstream modulation 64qamcable downstream interleave-depth 32cable downstream symbol-rate 5056941cable upstream 0 frequency 15008000cable upstream 0 feccable upstream 0 scramblerno cable upstream 0 shutdown!Tips
If you are having trouble:
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Activate the Upstream Scrambler
The scrambler on the upstream RF carrier enables cable modems on the HFC network to use built-in scrambler circuitry for upstream data transmissions. The scrambler circuitry improves reliability of the upstream receiver on the cable modem card. The upstream scrambler is activated by default and should not be disabled.
CautionScrambler must be activated for normal operation. Deactivate only for prototype modems that do not support scrambler.
To activate the upstream scrambler, use the following command in cable interface configuration mode:
Verify the Upstream Scrambler
To verify if the upstream scrambler is activated, enter the command more system:running-config and look for the cable interface configuration information. The following is an excerpt from the more system:running-config command output.
router# more system:running-configBuilding configuration...Current configuration:!!interface Cable6/0ip address 1.1.1.1 255.255.255.0no keepalivecable insertion-interval 150000cable downstream annex Bcable downstream modulation 64qamcable downstream interleave-depth 32cable downstream symbol-rate 5056941cable upstream 0 frequency 15008000cable upstream 0 feccable upstream 0 scramblerno cable upstream 0 shutdown!endTips
If you are having trouble:
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Make sure that you have entered the correct upstream port number. Currently this is always u0.
Activate the Upstream Ports
Activate the RF carrier on the upstream ports. Each upstream port must be activated to enable upstream data from the cable modems on the HFC network to the Cisco uBR7246.
To activate the upstream ports, use the following commands in global configuration mode:
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interface cable port/slot
Specify a cable interface, and enter the cable interface configuration mode.
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no cable upstream 0 shutdown
Enable upstream data traffic.
Verify the Upstream Ports
To verify if the upstream ports are activated or deactivated, enter the show interface cable command for the upstream port that you have just configured:
router# show interface cable 6/0Cable6/0 is up, line protocol is upHardware is BCM3210 FPGA, address is 00e0.1e5f.7a60 (bia 00e0.1e5f.7a60)Internet address is 1.1.1.3/24MTU 1500 bytes, BW 27000 Kbit, DLY 1000 usec, rely 255/255, load 1/255Encapsulation, loopback not set, keepalive not setARP type: ARPA, ARP Timeout 04:00:00Last input 00:00:25, output 00:00:00, output hang neverLast clearing of "show interface" counters neverQueueing strategy: fifoOutput queue 0/40, 0 drops; input queue 0/75, 0 drops5 minute input rate 0 bits/sea, 0 packets/sec5 minute output rate 0 bits/sec, 0 packets/sec10878 packets input, 853740 bytes, 0 no bufferReceived 3679 broadcasts, 0 runts, 0 giants, 0 throttles3 input errors, 3 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort5401 packets output, 645885 bytes, 0 underruns0 output errors, 0 collisions, 9 interface resets0 output buffer failures, 0 output buffers swapped outTips
If you are having trouble:
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Configure and Activate Baseline Privacy
To encrypt upstream and downstream data, you need to configure and activate baseline privacy. Baseline privacy on an HFC network is configured with key encryption keys (keks) and traffic encryption keys (teks). The encryption is based on 40-bit or 56-bit data encryption standard (DES) encryption algorithms.
A kek is assigned to a cable modem based on the cable modem's service identifier (SID) and permits the cable modem to connect to the Cisco uBR7246 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 uBR7246.
Keks and teks can be set to expire based on a grace-time or a life-time value. A grace-time key is used to assign a temporary key to a cable modem to access the network. A life-time key is used to assign a more permanent key to a cable modem. Each cable modem that has a life-time key assigned will request a new life-time key from the Cisco uBR7246 before the current one expires.
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The configuration and activation of baseline privacy depend on each cable operator's physical plant.
To configure and activate baseline privacy, perform the following tasks:
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Configure Kek Encryption Key Privacy
To configure kek data privacy on the HFC network, use the following command in global configuration mode:
cable privacy kek grace-time seconds
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cable privacy kek life-time secodsSet the cable privacy kek grace-time.
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Set the cable privacy kek life-time.
A grace-time kek can be set from 300 to 1,800 seconds. A life-time kek can be set from 86,400 to 6,048,000 seconds.
Verify Key Encryption Key Privacy
To verify the kek life-time or grace-time values that have been set, enter the show cable privacy kek command:
router# show cable privacy kekConfigured KEK life-time value = 750000Tips
If you are having trouble, make sure you have entered a valid value for grace-time or life-time.
Configure Traffic Encryption Key Privacy
To configure tek data privacy on the HFC network, use the following command in global configuration mode:
cable privacy tek grace-time seconds
cable privacy tek life-time secondsSet the cable privacy tek grace-time.
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Set the cable privacy tek life-time.
A grace-time tek can be set from 300 to 1,800 seconds. A life-time tek can be set from 1,800 to 604,800 seconds.
Verify Traffic Encryption Key Privacy
To verify the tek life-time or grace-time values that have been set, enter the show cable privacy tek command:
router# show cable privacy tekConfigured TEK life-time value = 56000Tips
If you are having trouble, make sure you have entered a valid value for grace-time or life-time.
Activate Baseline Privacy
After the kek and tek vales have been set, you can activate encryption on the HFC network.
To activate baseline data privacy on the HFC network, use the following commands in global configuration mode:
Verify Baseline Privacy Activation
To verify if baseline privacy is activated, enter the cable privacy enable or cable privacy mandatory command. By default, cable privacy is enabled and can only be disabled with the no cable privacy command.
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If you are having trouble, make sure you have entered a valid value for grace-time or life-time for kek and tek privacy.
Configure and Activate Frequency Agility
Frequency agility is a way to improve performance on upstream signal traffic and to compensate for noise and interference. The spectrum manager monitors the upstream frequencies; if too much noise or interference is detected in an upstream channel, the spectrum manager reassigns the upstream channel to a different upstream frequency.
Frequency agility is configured and activated using spectrum groups. A spectrum group is a table of frequencies that can be used by upstream ports to implement a frequency-hopping policy. There are two types of policies, blind and scheduled, with two corresponding types of spectrum groups.
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The configuration and activation of frequency agility depends on each cable operator's physical plant.
To configure and activate frequency agility, perform the following tasks:
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Create Spectrum Groups
To create spectrum groups, use the following commands in global configuration mode:
Verify Spectrum Group Creation
To verify that a spectrum group has been created, enter the show cable spectrum-group command:
router# show cable spectrum-groupspectrum-group 1spectrum-group 2spectrum-group 3Tips
If you are having trouble, make sure you have entered a valid spectrum group number and type.
Configure and Activate Spectrum Groups
After you create a spectrum group, you need to configure a list of upstream frequencies and nominal power levels that each spectrum group can use when an upstream frequency change is necessary. Each spectrum group should have its own list of upstream frequencies. Valid frequencies are 5,000,000 to 42,000,000 Hz, and valid power levels are -10 dBmV to 10 dBmV. The power level value should only be changed if you want to change only the power level as part of spectrum management. The standard power level is 0 dBmV.
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To configure and activate a spectrum group, use the following command in global configuration mode:
Verify Spectrum Group Configuration and Activation
To verify if spectrum groups have been configured and activated, enter the show cable spectrum-group command:
router# show cable spectrum-groupspectrum-group 16 .500 MHz 0 dBmV input level7 .000 MHz 0 dBmV input levelspectrum-group 27 .500 MHz -5 dBmV input levelspectrum-group 39 .000 MHz -0 dBmV input level9 .500 MHz -5 dBmV input levelTips
If you are having trouble, make sure you entered a valid spectrum group number, time, frequency, and input power level.
Activate IP Address Resolution Protocol
Address Resolution Protocol (ARP) is an Internet protocol used to map IP addresses to MAC addresses on computers and other equipment installed in a network. You need to activate ARP requests so the Cisco uBR7246 can perform IP address resolution on the downstream path.
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Activate Address Resolution Protocol Requests
To activate ARP requests, use the following command in cable interface configuration mode:
Verify ARP Activation
To verify if ARP has been activated, enter the command more system:running-config and look for the cable interface configuration information. If ARP has been activated, it does not appear in this output. If ARP has been deactivated, it will appear in the output as no cable arp as shown in this command output excerpt:
router# more system:running-configBuilding configuration...Current configuration:!interface Cable6/0ip address 1.1.1.1 255.255.255.0no keepaliveno cable arpcable insertion-interval 150000cable downstream annex Bcable downstream modulation 64qamcable downstream interleave-depth 32cable downstream symbol-rate 5056941cable upstream 0 frequency 15008000cable upstream 0 feccable upstream 0 scramblerno cable upstream 0 shutdown!Tips
If you are having trouble, make sure you entered the correct port and modem card slot number when you activated ARP and when you entered the show interface cable command.
Activate Host-to-Host Communication (Proxy ARP)
Proxy ARP allows the Cisco uBR7246 to issue ARP requests on behalf of cable modems on the same cable network subnet.
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Activate Proxy ARP Requests
To activate proxy ARP for host-to-host communications, use the following command in cable interface configuration mode:
Verify Proxy ARP Activation
To verify if proxy ARP has been activated or deactivated, enter the command more system:running-config and look for the cable interface configuration information. If proxy ARP has been activated, it does not appear in this output. If proxy ARP has been deactivated, it will appear in the output as no cable proxy-arp as shown in this command output excerpt:
router# more system:running-configBuilding configuration...Current configuration:!interface Cable6/0ip address 1.1.1.1 255.255.255.0no keepaliveno cable proxy-arpcable insertion-interval 150000cable downstream annex Bcable downstream modulation 64qamcable downstream interleave-depth 32cable downstream symbol-rate 5056941cable upstream 0 frequency 15008000cable upstream 0 feccable upstream 0 scramblerno cable upstream 0 shutdown!Tips
If you are having trouble, make sure you entered the correct port and modem card slot number when you activated proxy ARP.
Set Optional IP Parameters
There are additional IP parameters that you can optionally set to enable downstream echoing of upstream data.
To configure optional IP parameters, perform the following tasks:
Note
Activate IP Multicast Echo
You can activate upstream IP multicast echo so that the Cisco uBR7246 can echo multicast packets. The default is "on" (IP multicast echo is activated). To activate IP multicast echo, use the following command in cable interface configuration mode:
Verify IP Multicast Echo Activation
To verify if IP multicast echo has been activated or deactivated, enter the command more system:running-config and look for the cable interface configuration information. If IP multicast echo has been activated, it does not appear in this output. If IP multicast echo has been deactivated, it appears in this output as no cable ip-multicast-echo as shown in the command output excerpt below:
router# more system:running-configBuilding configuration...Current configuration:!interface Cable6/0ip address 1.1.1.1 255.255.255.0no keepaliveno cable ip-multicast-echocable insertion-interval 150000cable downstream annex Bcable downstream modulation 64qamcable downstream interleave-depth 32cable downstream symbol-rate 5056941cable upstream 0 frequency 15008000cable upstream 0 feccable upstream 0 scramblerno cable upstream 0 shutdown!Tips
If you are having trouble, make sure that you have entered the correct slot and port numbers when you entered cable interface configuration mode.
Activate IP Broadcast Echo
You can activate upstream IP broadcast echo so that the Cisco uBR7246 can echo broadcast packets. The default value is "off" (IP broadcast echo is not activated). To activate IP broadcast echo, use the following command in cable interface configuration mode:
Verify IP Broadcast Echo Activation
To verify if IP broadcast echo has been activated or deactivated, enter the command more system:running-config and look for the cable interface configuration information as shown in this command output excerpt:
router# more system:running-configBuilding configuration...Current configuration:!interface Cable6/0ip address 1.1.1.1 255.255.255.0no keepalivecable ip-broadcast-echocable insertion-interval 150000cable downstream annex Bcable downstream modulation 64qamcable downstream interleave-depth 32cable downstream symbol-rate 5056941cable upstream 0 frequency 15008000cable upstream 0 feccable upstream 0 scramblerno cable upstream 0 shutdown!Tips
If you are having trouble, make sure that you entered the correct slot and port numbers when you entered cable interface configuration mode.
Manage Cable Modems on the HFC Network
After you have completed upstream and downstream signal configuration, there are a number of different things you can do to manage how your cable modems operate in the HFC network. You can control access by forcing cable modems to authenticate with the Cisco uBR7246, allow only known cable modems to send upstream data, move cable modems to different channels, and define a length of time a cable modem can request a connection.
To manage cable modems, perform the following tasks:
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Note
Activate Cable Modem Authentication
You can activate authentication so all cable modems must return a known text string to register with the Cisco uBR7246 for access to the network. The text string can be from 1 to 80 characters in length. The default is "on" (cable modem authentication is activated).
To activate cable modem authentication, use the following command from the cable interface configuration mode:
Verify Cable Modem Authentication
To verify if cable modem authentication has been activated or deactivated, enter the command more system:running-config and look for the cable interface configuration information. If cable modem authentication has been activated, it does not appear in this output. If cable modem authentication has been deactivated, it appears in this output as no cable secret-shared as shown in this command output excerpt:
router# more system:running-configBuilding configuration...Current configuration:!interface Cable6/0ip address 1.1.1.1 255.255.255.0no keepaliveno cable secret-sharedcable insertion-interval 150000cable downstream annex Bcable downstream modulation 64qamcable downstream interleave-depth 32cable downstream symbol-rate 5056941cable upstream 0 frequency 15008000cable upstream 0 feccable upstream 0 scramblerno cable upstream 0 shutdown!Tips
If you are having trouble, make sure you entered the correct slot and port numbers when you entered cable interface configuration mode.
Activate Cable Modem Upstream Address Verification
You activate cable modem upstream address verification to ensure that only known cable modems on the HFC network can transmit upstream data to a Cisco uBR7246. The default is "off" (cable modem upstream address verification is deactivated).
To activate or deactivate cable modem upstream verification, use the following command:
Verify Cable Modem Upstream Verification
To verify that cable modem upstream verification has been activated or deactivated, enter the command more system:running-config and look for the cable interface configuration information. If cable modem upstream verification has been deactivated, it does not appear in this output. If cable modem upstream verification has been activated, it appears in this output as cable source-verify as shown in this command output excerpt:
router# more system:running-configBuilding configuration...Current configuration:!interface Cable6/0ip address 1.1.1.1 255.255.255.0no keepalivecable source-verifycable insertion-interval 2000cable downstream annex Bcable downstream modulation 64qamcable downstream interleave-depth 32cable downstream symbol-rate 5056941cable upstream 0 frequency 15008000cable upstream 0 feccable upstream 0 scramblerno cable upstream 0 shutdown!Tips
If you are having trouble, make sure that you entered the correct slot and port numbers when you entered cable interface configuration mode.
Activate Cable Modem Insertion Interval
When a cable modem is ready to transmit data, it requests a channel from the Cisco uBR7246. You can limit the amount of time that a cable modem requests a channel for the first time from the Cisco uBR7246. A cable modem's initial channel request is known as insertion. The valid range is 100 to 2000 milliseconds.
To activate cable modem insertion interval, use the following command in cable interface configuration mode:
Verify Cable Modem Insertion Interval
To verify that a cable modem insertion interval has been set, enter the command more system:running-config and look for the cable interface configuration information as shown in this command output excerpt:
router# more system:running-configBuilding configuration...Current configuration:!interface Cable6/0ip address 1.1.1.1 255.255.255.0no keepalivecable insertion-interval 2000cable downstream annex Bcable downstream modulation 64qamcable downstream interleave-depth 32cable downstream symbol-rate 5056941cable upstream 0 frequency 15008000cable upstream 0 feccable upstream 0 scramblerno cable upstream 0 shutdown!Tips
If you are having trouble, make sure that you entered the correct slot and port numbers when you typed the command.
Universal Broadband Features Configuration Example
Most of the default values for the commands described in this document are adequate to configure the Cisco uBR7246. The following example shows the minimum configuration necessary to enable this feature:
! Enter the global configuration mode.configure terminal!!Enter the cable interface configuration mode. This example shows that the!Cisco MC11 card is in the 6th slot or bottom slot of the Cisco uBR7246 chassis.interface cable 6/0!!Configure the upstream data frequency. In this example, for channel 0, the frequency is 15, 800 MhZ, or 15,800,000 Hz.cable u0 1580000!Enable cable interface.no cable upstream 0 shutdown!Enable router interface.no shutdown!Set interface's IP addressip address <ipaddr> <subnet mask>endCommand Reference
This section documents new or modified commands on the Cisco uBR7246. All other commands used with this feature are documented in the Cisco IOS Release 11.3 command references.
The following commands are new or have been modified to support the Cisco uBR7246:
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Changed Commands
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cable arp
To activate cable Address Resolution Protocol (ARP), use the cable arp cable interface configuration command. Use the no form of this command to disable cable ARP.
cable arp
no cable arpSyntax Description
This command has no arguments or keywords.
Default
ARP enabled
Command Mode
Cable interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
ARP is an Internet protocol used to map IP addresses to MAC addresses on computers and other equipment installed in a network. You need to activate ARP requests so the Cisco uBR7246 can perform IP address resolution on the downstream path.
Examples
This following example activates cable ARP requests for port 0 on the cable modem installed in slot 6:
configure terminalinterface cable 6/0cable arpcable channel-change
To move a cable modem to another channel, use the cable channel-change cable interface configuration command. Use the no form of this command to disable this feature.
cable channel-change sid channel
no cable channel-change sid channelSyntax Description
Default
0
Command Mode
Cable interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Moving a cable modem to a new channel can improve performance, increase bandwidth availability, or troubleshoot a cable modem. You use the SID to identify a particular cable modem.
Examples
The following example changes a cable modem channel allocation from SID 50 to 0:
interface cable 6/0cable channel-change 50 0cable downstream annex
To set the MPEG framing format for a downstream port on a cable modem card to either Annex A (Europe) or Annex B (North America), use the cable downstream annex cable interface configuration command.
cable downstream annex {A | B}
Syntax Description
Default
Annex B
Command Mode
Cable interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
The MPEG framing format must be compatible with the downstream symbol rate you set. Annex B is the North America standard and Annex A is the European standard. You should review your local standards and specifications for downstream MPEG framing to determine which format you should use.
Note
Example
The following example sets the MPEG framing format to Annex A:
interface cable 6/0cable downstream annex Acable downstream frequency
To set the fixed center frequency for downstream RF carrier in Hz, enter the cable downstream frequency cable interface configuration command. Use the no form of this command to set no fixed center frequency.
cable downstream frequency down-freq-hz
no cable downstream frequencySyntax Description
down-freq-hz
The known center frequency of the downstream carrier in Hz. The valid range is 54,000,000 to 1,020,000,000 Hz.
Default
Disabled
Command Mode
Cable interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
You need to set the downstream frequency of your RF output to comply with the expected input frequency of your upconverter. To do this, you enter the fixed center frequency of the downstream RF carrier for a downstream port. (You can also select a default which does not set a specific fixed value.) The valid range for a fixed center frequency is 54,000,000 to 1,020,000,000 Hz. The center frequency is also used to configure an IF-to-RF upconverter that must be installed in your downstream path.
To calculate the center frequency, add the frequencies in Hz of the lowest channel and the highest channel available at your headend. Divide that number by 2. The typical range for current CATV headends is 88,000,000 to 860,000,000 Hz; the MCNS specification is 94,000,000 to 860,000,000 Hz.
Note
Example
The following example sets the downstream center frequency:
interface cable 6/0cable downstream frequency 96000000cable downstream if-output
To activate a downstream port on a cable modem card for digital data transmissions over the HFC network, use the cable downstream if-output cable interface configuration command. Use the no form of this command to disable the 44 MHz intermediate frequency (IF) carrier.
cable downstream if-output
no cable downstream if-outputSyntax Description
This command has no arguments or keywords.
Default
Downstream carrier enabled
Command Mode
Cable interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Example
The following example enables the downstream port 0 on the cable modem installed in slot 6:
interface cable 6/0cable downstream if-outputcable downstream interleave-depth
To set the downstream interleave depth, use the cable downstream interleave-depth cable interface configuration command. Use the no form of this command to restore the default.
cable downstream interleave-depth {8 | 16 | 32 | 64 | 128}
no cable downstream interleave-depthSyntax Description
8 | 16 | 32 | 64 | 128
Indicates the amount of time (in milliseconds) that defines the downstream interleave depth. The default is 32.
Default
32
Command Mode
Interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
This command sets the minimum latency of the system. Higher interleave depth provides more protection from bursts of noise on the HFC network; however, higher depth also increases downstream latency. shows interleave characteristics.
Table 1
Interleaver Characteristics
Example
The following example configures the downstream interleave depth to 128:
interface cable 6/0cable downstream interleave-depth 128cable downstream modulation
To set the modulation rate for a downstream port on a cable modem card, use the cable downstream modulation cable interface configuration command:
cable downstream modulation {64qam}
Syntax Description
Default
64qam
Command Mode
Cable interface configuration
Usage Guidelines
This command was added in Cisco IOS Release 11.3 XA.
Downstream modulation is the speed at which downstream data travels to the user; by setting the downstream modulation, you define the speed, which is 64qam (6 bits per downstream symbol rate, which is the standard Multimedia Cable Network Systems (MCNS) rate).
Note
Example
The following example sets the downstream modulation:
interface cable 6/0cable downstream modulation 64cable downstream symbol-rate
To set the megasymbols per second (Msps) rate for a downstream port on a cable modem card, use the cable downstream symbol-rate cable interface configuration command. Use the no form of this command to restore the default.
cable downstream symbol-rate number
no cable downstream symbol-rateSyntax Description
number
Number of megasymbols per second (Msps) rate for a downstream port. The valid range is 0 to 6000000 Msps.
Default
5056941 symbols per second (sps) with 64-QAM and 5360537 sps for 256-QAM.
Command Mode
Cable interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
A symbol is the basic unit of modulation. QPSK encodes 2 bits per symbol, 16-QAM encodes 4 bits per symbol, 64-QAM encodes 6 bits per symbol, and 256-QAM encodes 8 bits per symbol. The valid range for the downstream symbol rate is 0 to 6,000,000 Msps.
CautionThe default downstream symbol rate is set to comply with MCNS specifications for Annex B cable modem support at 5.056941 Msps with 64-QAM modulation and 5.36037 Msps with 256-QAM modulation. This command should only be used to change the symbol rate to support Annex A cable modems that are used outside of North America.
Example
The following example sets the downstream symbol rate to 5056941 symbols per second (sps) to comply with MCNS specifications for Annex B:
interface cable 6/0cable downstream symbol-rate 5056941cable insertion-interval
To limit the amount of time that a cable modem can request a channel for the first time from the Cisco uBR7246, use the cable insertion-interval cable interface configuration command. Use the no form of this command to restore the default value fro this command.
cable insertion-interval milliseconds
no cable insertion-intervalSyntax Description
milliseconds
Amount of time in milliseconds the cable modem can request a channel. Valid entries are from 100 to 2000 milliseconds.
Default
2000 milliseconds
Command Mode
Cable interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
When a cable modem connects to the HFC network, it requests a channel from the Cisco uBR7246. Use the cable insertion-interval command to limit the amount of time that a cable modem requests a channel for the first time from the Cisco uBR7246. A cable modem's initial channel request is known as insertion.
Example
The following example limits the amount of time that a cable modem can request a channel for the first time from the Cisco uBR7246 (insertion-interval) to 1500 milliseconds:
interface cable 6/0cable insertion-interval 1500cable ip-multicast-echo
To enable IP multicast echo, use the cable ip-multicast-echo cable interface configuration command. Use the no form of this command to disable IP multicast echo.
cable ip-multicast-echo
no cable ip-multicast-echoSyntax Description
This command has no arguments or keywords.
Default
IP multicast echo is enabled.
Command Mode
Cable interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Example
The following example activates IP multicast echo:
interface cable 6/0cable ip-multicast-echocable ip-broadcast-echo
To activate upstream IP broadcast echo so the Cisco uBR7246 can echo broadcast packets, use the cable ip-broadcast-echo cable interface configuration command. Use the no form of this command to disable the upstream IP broadcast echo.
cable ip-broadcast-echo
no cable ip-broadcast-echoSyntax Description
This command has no arguments or keywords.
Default
IP broadcast echo is disabled
Command Mode
Cable interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Example
The following example activates IP broadcast echo:
interface cable 6/0cable ip-broadcast-echocable privacy kek grace-time
To set key encryption keys (keks) grace-time values for baseline privacy on an HFC network, use the cable privacy kek grace-time global configuration command. Use the no form of this command to restore the default value.
cable privacy kek grace-time [seconds]
no cable privacy kek grace-timeSyntax Description
seconds
Number of seconds defining the length of key encryption grace-time. Valid range is 300 to 1800 seconds. Default is 600 seconds.
Default
600 seconds for kek grace-time
Command Mode
Global configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Baseline privacy on an HFC network is configured with key encryption keys (keks) and traffic encryption keys (teks). The encryption is based on 40-bit or 56-bit data encryption standard (DES) encryption algorithms.
A kek is assigned to a cable modem based on the cable modem's service identifier (SID) and permits the cable modem to connect to the Cisco uBR7246 when baseline privacy is activated. Keks can be set to expire based on a grace-time or a life-time value. A grace-time key is used to assign a temporary key to a cable modem to access the network.
A cable modem must renew its kek (grace-seconds) before it expires.
Example
The following example sets kek privacy grace-time to 800 seconds:
configure terminalcable privacy kek grace-time 800cable privacy kek life-time
To set key encryption keys (keks) life-time values for baseline privacy on an HFC network, use the cable privacy kek life-time global configuration command. Use the no form of this command to restore the default value.
cable privacy kek life-time [seconds]
no cable privacy kek life-timeSyntax Description
seconds
Number of seconds defining the length of the key encryption life-time.Valid range is 86400 to 6048000. Default is 604800 seconds.
Default
604800 seconds for kek life-time
Command Mode
Global configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Baseline privacy on an HFC network is configured with key encryption keys (keks) and traffic encryption keys (teks). The encryption is based on 40-bit or 56-bit data encryption standard (DES) encryption algorithms.
A kek is assigned to a cable modem based on the cable modem's service identifier (SID) and permits the cable modem to connect to the Cisco uBR7246 when baseline privacy is activated. Keks can be set to expire based on a grace-time or a life-time value. A life-time key is used to assign a more permanent key to a cable modem. Each cable modem that has a life-time key assigned will request a new life-time key from the Cisco uBR7246 before the current one expires.
A cable modem must renew its kek (lifetime-seconds) before it expires.
Example
The following example sets kek privacy life-time to 750,000 seconds:
configure terminalcable privacy kek life-time 750000cable privacy tek grace-time
To set traffic encryption keys (teks) grace-time values for baseline privacy on an HFC network, use the cable privacy tek grace-time global configuration command. Use the no form of this command to restore the default value.
cable privacy tek grace-time [seconds]
no cable privacy tek grace-timeSyntax Description
seconds
Number of seconds defining the length of traffic encryption grace-time. Valid range is 300 to 1800 seconds. Default is 600 seconds.
Default
600 seconds for tek grace-time
Command Mode
Global configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Baseline privacy on an HFC network is configured with key encryption keys (keks) and traffic encryption keys (teks). The encryption is based on 40-bit or 56-bit data encryption standard (DES) encryption algorithms.
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 uBR7246. Teks can be set to expire based on a grace-time or a life-time value. A grace-time key is used to assign a temporary key to a cable modem to access the network.
A cable modem must renew its tek (grace-seconds) before it expires.
Example
The following example sets traffic encryption key grace-time to 800 seconds:
configure terminalcable privacy tek grace-time 800cable privacy tek life-time
To set traffic encryption keys (teks) grace-time and life-time values for baseline privacy on an HFC network, use the cable privacy tek life-time global configuration command. Use the no form of this command to restore the default value.
cable privacy tek life-time [seconds]
no cable privacy tek life-timeSyntax Description
seconds
Number of seconds defining the length of the traffic encryption lifetime.Valid range is 1800 to 6048000. Default is 43200 seconds.
Default
43,200 seconds for tek life-time
Command Mode
Global configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Baseline privacy on an HFC network is configured with key encryption keys (keks) and traffic encryption keys (teks). The encryption is based on 40-bit or 56-bit data encryption standard (DES) encryption algorithms.
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 uBR7246. Teks can be set to expire based on a grace-time or a life-time value. A life-time key is used to assign a more permanent key to a cable modem. Each cable modem that has a life-time key assigned will request a new life-time key from the Cisco uBR7246 before the current one expires.
A cable modem must renew its tek (life-time second) before it expires.
Example
The following example sets traffic encryption key life-time to 43,200 seconds:
configure terminalcable privacy tek life-time 43200cable proxy-arp
To activate cable proxy Address Resolution Protocol (ARP) on the cable interface, use the cable proxy-arp cable interface configuration command. Use the no form of this command to disable this feature.
cable proxy-arp
no cable proxy-arpSyntax Description
This command has no arguments or keywords.
Default
Disabled
Command Mode
Cable interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Because the downstream and upstream are separate interfaces, modems can not directly perform address resolution with other modems on the cable plant. This command allows modems to perform address resolution through a proxy.
Example
The following example activates proxy ARP for host-to-host communications:
interface cable 6/0cable proxy-arpcable shared-secret
To enable cable modem authentication, use the cable shared-secret cable interface configuration command. Use the no form of this command to disable cable modem authentication.
cable shared-secret secret-key
no cable shared-secretSyntax Description
Default
Null string
Command Mode
Cable interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Use this command to activate authentication so that all cable modems must return a known text string to register with the Cisco uBR7246 for access to the network.
Example
The following example activates cable modem authentication, using "scoobee" as the shared secret key:
interface cable 6/0cable shared-secret scoobeecable spectrum-group
To create a spectrum group, use the cable spectrum-group global configuration command. Use the no form of this command to disable this spectrum group.
cable spectrum-group group-number type {blind | scheduled | daily periodic-sec seconds}
no cable spectrum-group group-number type {blind | scheduled | daily periodic-sec seconds}Syntax Description
Default
No spectrum group is defined.
Command Mode
Global configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Upstream traffic may be affected by noise or other cable plant impairment. The spectrum manager monitors the upstream traffic. If station maintenance messages from cable modems are not received for approximately 2.5 minutes, then the spectrum manager reassigns a different upstream frequency to the upstream channel.
Frequency agility is configured and activated using spectrum groups. A spectrum group is a table of frequencies that can be used by upstream ports to implement a frequency-hopping policy. There are two types of policies, blind and scheduled, with two corresponding types of spectrum groups.
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Note
A maximum of 32 spectrum groups can be configured in the system.
Example
The following example creates spectrum groups and sets the periodic rate to 48000 seconds:
configure terminalcable spectrum-group 1 type blindcable spectrum-group 2 type scheduled dailycable spectrum-group 3 type scheduled periodic-sec 48000cable spectrum-group frequency
To configure a list of upstream frequencies and nominal power levels that each spectrum group can use when an upstream frequency change is necessary, use the cable spectrum-group frequency global configuration command. Use the no form of this command to delete a spectrum group list.
cable spectrum-group group-number [time hh:mm:ss] frequency up-freq-hz
[power-level-dbmv]
no cable spectrum-group group-numberSyntax Description
Default
Operator must determine a value based on his spectrum allocation plan.
Command Mode
Global configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
After you create a spectrum group, you need to configure a list of upstream frequencies and nominal power levels that each spectrum group can use when an upstream frequency change is necessary. Each spectrum group should have its own list of upstream frequencies. Valid frequencies are 5,000,000 to 42,000,000 Hz, and valid power levels are -10 dBmV to 10 dBmV. The power level value should only be changed if you want to change only the power level as part of spectrum management. The standard power level is 0 dBmV.
Example
The following example creates spectrum group frequencies:
configure terminalcable spectrum-group 1 frequency 6500000cable spectrum-group 1 frequency 7000000dcable spectrum-group 2 frequency 750000 -5cable spectrum-group 3 time 02:00:00 frequency 9000000cable spectrum-group 3 time 02:00:00 frequency 9500000 -5endcable source-verify
To display information about the cable source, use the cable source-verify cable interface configuration command. Use the no form of this command to disable the display of this information.
cable source-verify
no cable source-verifySyntax Description
This command has no arguments or keywords.
Default
Disabled
Command Mode
Cable interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Example
The following example activates cable upstream verification:
configure terminalinterface cable 6/0cable source-verifycable upstream fec
To enable the upstream forward error correction (FEC), use the cable upstream fec cable interface configuration command. Use the no form of this command to disable FEC.
cable upstream port fec
no cable upstream port fecSyntax Description
Default
FEC is disabled.
Command Mode
Interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
The Cisco uBR7246 uses forward error correction (FEC) to attempt to correct any upstream data that might have been corrupted. To use this feature, you need to activate FEC on the upstream RF carrier. When FEC is activated, the Cisco uBR7246 commands all cable modems on the network to activate FEC.
Example
The following example activates upstream forward error correction:
configure terminalinterface cable 6/0cable upstream 0 fecRelated Commands
You can use the master indexes or search online to find documentation of related commands.
cable upstream frequency
cable upstream power level
cable upstream scrambler
cable upstream shutdowncable upstream frequency
To enter a fixed frequency of the upstream RF carrier for an upstream port, use the cable upstream frequency cable interface configuration command. Use the no form of this command to restore the default value for this command.
cable upstream port frequency up-freq-hz
no cable upstream port frequency up-freq-hzSyntax Description
Default
Upstream center frequency is not configured to a fixed value.
Command Mode
Cable interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
You need to set the upstream frequency of your RF output to comply with the expected input frequency of your Cisco MC11 cable modem. You do this by entering a fixed frequency of the upstream RF carrier for an upstream port. The valid range for a fixed upstream frequency is 5,000,000 Hz to 42,000,000 Hz.
Example
The following example configures the upstream center frequency for port 0 (located in slot 6) to 5,700,000 Hz.
interface cable 6/0cable upstream 0 frequency 5700000cable upstream power-level
To set the input power level for the upstream RF carrier in decibels per millivolt (dBmV), use the cable upstream power-level cable interface configuration command. Use the no form of this command to restore the default configuration value for this command.
cable upstream port power-level dbmv
no cable upstream port power-level dbmvSyntax Description
Default
Upstream nominal input power level is configured to 0 dBmV
Command Mode
Cable interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
The power level of the upstream signal has to match MC11 cable modems expected input power levels. Because of this, you need to set the nominal input power level for the upstream RF carrier in decibels per millivolt (dBmV). You can also select the default of 0 dBmV, which is the optimal setting for the upstream power level.
The valid range for the input power level is -10 dBmV to 10 dBmV. Higher values cause the modems to increase their transmit power, achieving a greater carrier-to-noise ratio (CNR). If your power levels operate at greater than 10 dBmV, you must use an in-line attenuator to bring the power level to within the valid range.
CautionIf you increase the input power level, the cable modems on your HFC network will increase their transmit power level. This might cause an increase in the carrier-to-noise ratio (CNR) on the network. Be careful if you adjust this parameter. You might violate the upstream return laser design parameters.
Example
The following example sets the upstream input power level:
interface cable 6/0cable upstream 0 power-level -5Related Commands
You can use the master indexes or search online to find documentation of related commands.
cable upstream fec
cable upstream frequency
cable upstream scrambler
cable upstream shutdowncable upstream scrambler
To enable the cable upstream scrambler, use the cable upstream scrambler cable interface configuration command. Use the no form of this command to restore the default configuration value for this command.
cable upstream port scrambler
no cable upstream port scramblerSyntax Description
Default
Upstream scrambler disabled
Command Mode
Cable interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
You need to activate the scrambler on the upstream RF carrier so that the cable modems on the HFC network will use built-in scrambler circuitry for upstream data transmissions. The scrambler circuitry improves reliability of the upstream receiver on the cable modem card. This command causes modems to enable their pseudo-random scrambler circuitry to improve the robustness of the upstream receiver on the line card.
CautionScrambler must be activated for normal operation. Deactivate only for prototype modems that do not support scrambler.
Example
The following example activates the upstream scrambler:
interface cable 6/0cable upstream 0 scramblerRelated Commands
You can use the master indexes or search online to find documentation of related commands.
cable upstream fec
cable upstream frequency
cable upstream power level
cable upstream shutdowncable upstream shutdown
To disable the upstream port, use the cable upstream shutdown cable interface configuration command. Use the no form of this command to enable the upstream port.
cable upstream port shutdown
no cable upstream port shutdownSyntax Description
Default
Upstream port enabled
Command Mode
Cable interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Example
The following example disables the upstream ports:
interface cable 6/0cable upstream 0 shutdownshow cable burst-profile
To display the upstream data burst profiles used to configure the upstream PHY, use the show cable burst-profile Privileged EXEC command.
show cable burst-profile
Syntax Description
This command has no arguments or keywords.
Command Mode
Privileged EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Sample Display
The following is sample output from the show cable burst-profile command:
router# show cable burst-profileBurst Type Preamb Diff FEC err FEC Scrambl Max Guard Last Scrambl profile length encode correct codeword seed burst time codewordnumber length size size shortened1 1 48 no 0x0 0x6 0x152 1 16 1 yes2 1 48 no 0x0 0x6 0x152 1 12 1 no3 1 48 no 0x5 0x2C 0x152 0 48 1 yes4 1 48 no 0x5 0x2C 0x152 0 48 1 yes5 1 48 no 0x5 0x32 0x152 0 20 1 yes6 1 48 no 0x0 0x32 0x152 0 20 1 nodescribes the fields shown in the show cable burst-profile display.
Related Commands
You can use the master indexes or search online to find documentation of related commands.
show cable modem
show cable modulation profile
show cable privacy
show cable qos
show cable spectrum-groupshow cable modem
To view configuration settings on the Cisco uBR7246, use the show cable EXEC command.
show cable modem [ip-address]
Syntax Description
Command Mode
Privileged EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
This command displays information on all cable modems or a particular cable modem on the network.
Sample Display
The following are sample outputs from the show cable modem command specifying two different IP addresses:
router# show cable modem 172.16.0.0Interface Upstream Timing offset SID QoS IP address MAC addressCable6/0 U0 2851 1 2 1.1.1.5 00e0.1eab.2c0bCable6/0 U0 2850 2 2 1.1.1.7 00e0.1eb2.bb07Cable6/0 U0 2852 3 2 1.1.1.2 00e0.1eab.2c29Cable6/0 U0 2851 4 2 1.1.1.6 00e0.1eb2.bb8fCable6/0 U0 2851 5 2 1.1.1.3 00e0.1eb2.bb53Cable6/0 U0 2852 6 2 1.1.1.4 00e0.1eb2.bbb1router# show cable modem 1.1.1.5Interface Upstream Timing offset SID QoS IP address MAC addressCable6/0 U0 2851 1 2 1.1.1.5 00e0.1eab.2c0bdescribes the fields shown in the show cable modem display.
Related Commands
You can use the master indexes or search online to find documentation of related commands.
show cable burst-profile
show cable modulation-profile
show cable privacy
show cable qos
show cable spectrum-groupshow cable modulation-profile
To display modulation profile group information, use the show cable modulation-profile Privileged EXEC command.
show cable modulation-profile
Syntax Description
This command has no arguments or keywords.
Command Mode
Privileged EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
This command displays modulation profile group information. A modulation profile is a collection of six burst profiles that are sent out in a UCD message to configure a modem's transmit parameters for the following upstream message types: request, request/data, initial maintenance, station maintenance, short grant, and long grant.
Sample Display
The following is sample output from the show cable modulation-profile command:
router# show cable modulation-profileModulation profile group Interval usage code Burst profile number1 1 11 3 31 4 41 5 51 6 6describes the fields shown in the show cable modulation-profile display.
.
Related Commands
You can use the master indexes or search online to find documentation of related commands.
show cable burst-profile
show cable modem
show cable privacy
show cable qos
show cable spectrum-groupshow cable privacy
To display baseline privacy information, use the show cable privacy Privileged EXEC command.
show cable privacy {tek | kek}
Syntax Description
Command Mode
Privileged EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Sample Display
The following are sample outputs for the show cable privacy command:
router# show cable privacy tekConfigured TEK life-time value = 56000Configured TEK grace-time value = 900router# show cable privacy kekConfigured KEK life-time value = 750000Configured KEK grace-time value = 800describes the fields shown in the show cable privacy displays.
Related Commands
You can use the master indexes or search online to find documentation of related commands.
show cable burst-profile
show cable modem
show modulation-profile
show cable qos
show cable spectrum-groupshow cable qos
To display information about the quality of service (QoS), use the show cable qos Privileged EXEC command.
show cable qos
Syntax Description
This command has no arguments or keywords.
Command Mode
EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Sample Display
The following is sample output from the show cable qos command:
router# show cable qosService Priority Max upstream Guarantee upstream Max downstream Max txclass bandwidth bandwidth bandwidth burst1 7 0 0 0 02 7 2000000 100000 4000000 0describes the fields shown in the show cable qos display.
Related Commands
You can use the master indexes or search online to find documentation of related commands.
show cable burst-profile
show cable modem
show modulation-profile
show cable spectrum-groupshow cable spectrum group
To display spectrum group information, use the show cable spectrum-group Privileged EXEC command.
show cable spectrum group [group-number]
Syntax Description
Command Mode
EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Use this command to display spectrum group information. Spectrum groups are used to manage frequency agility; the automatic reassignment of upstream channels when a channel shows loss of signal quality.
Sample Displays
The following are sample outputs from two uses of the show cable spectrum-group command:
router# show cable spectrum-groupspectrum-group 16 .500 MHz 0 dBmV input level7 .000 MHz 0 dBmV input level7 .500 MHz 0 dBmV input levelspectrum-group 27 .000 MHz -10 dBmV input level7 .000 MHz -5 dBmV input level7 .000 MHz 0 dBmV input level7 .000 MHz 5 dBmV input level7 .000 MHz 10 dBmV input levelrouter# show cable spectrum-group 1spectrum-group 16 .500 MHz 0 dBmV input level7 .000 MHz 0 dBmV input level7 .500 MHz 0 dBmV input leveldescribes the fields shown in the show cable spectrum-group displays.
Related Commands
You can use the master indexes or search online to find documentation of related commands.
show cable burst-profile
show cable modem
show cable modulation-profile
show cable privacy
show cable qosshow controllers cable
To display information about a specific cable modem card slot's interface controllers, use the show controllers cable Privileged EXEC command.
show controllers cable slot/port [downstream | upstream [channel]]
Syntax Description
Command Mode
Privileged EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Example
The following is sample output from the show controllers cable command for the cable modem located in slot 3/port 0:
router# show controllers cable 3/0Cable3/0: Downstream is up2422977 packets output, 126650143 bytes, 0 discarded0 output errorsHardware is CMTS Line Cardidb 0x6099DFD8 MAC regs 0x3CC80000 PLX regs 0x3CC00000rx ring entries 64 tx ring entries 128 MAP tx ring entries 128Rx ring 0x4B0607C0 shadow 0x60A64BF8 head 5Tx ring 0x4B060A00 shadow 0x60A64D68 head 47 tail 47 count 0MAP Tx ring 0x4B060E40 shadow 0x60A655D8 head 80 tail 80 count 0MAP timer sourced from slot 6throttled 0 enabled 0 disabled 0Rx: spurious 0 framing_err 0 hcs_err 0 no_buffer 0no_enqueue 0 no_enp 0 miss_count 2 latency 2Tx: full 0 drop 0 stuck 0 latency 0MTx: full 0 drop 0 stuck 0 latency 0Slots 2134 NoUW 1 Uncorr 0 Corr 0Req 96524429 ReqColl 0 ReqNoise 0Rng 494 RngColl 0 RngNoise 1MAP FIFO overflow 0, Rx FIFO overflow 0Bandwidth Requests= 0x47BPiggyback Requests= 0x2Ranging Requests= 0x1ECTiming Offset = 0x1describes the fields shown in the show controllers cable display.
The following is sample output for the downstream connection for slot 3 on port 0 from the show controllers cable downstream command:
router# show controllers cable 3/0 downstreamCable 3/0 Downstream is upFrequency not set, Channel Width 6 MHz, 64-QAM,Symbol Rate 5.056941 MspsFEC ITU-T J.83 Annex A, R/S Interleave I=12, J=17describes the fields shown in the show controllers cable downstream display.
The following is sample output for the upstream connection for slot 3 on port 0 from the show controllers cable upstream command:
router# show controllers cable 3/0 upstream 0Cable3/0 Upstream 0 is upFrequency 7.008 MHz, Channel Width 1.6 MHz, QPSK Symbol Rate 1.280 MspsNominal Input Power Level 0 dBmV, Tx Timing Offset 0Ranging Backoff Start 0, Ranging Backoff End 3, Tx Backoff Start 2Tx Backoff End 8, Modulation Profile Group 1part_id=0x3136, rev_id=0x02, rev2_id=0x61nb_agc_thr=0x0100, nb_agc_nom=0x3000Range Load Reg Size=0x44Request Load Reg Size=0x0CDES Reg #580 = E204301, #584 = 3E030303, #588 = 0#590 = C0C0C0Cdescribes the fields shown in the show controllers cable upstream display.
show interface cable
To display cable interface information, use the show interface cable Privileged EXEC command:
show interface cable port/slot [downstream | upstream]
Syntax Description
Command Mode
Privileged EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Example
The following is sample output for the cable modem located in slot 6/port 0 from the show interface cable command:
router# show interface cable 6/0Cable6/0 is up, line protocol is upHardware is BCM3210 FPGA, address is 00e0.1e5f.7a60 (bia 00e0.1e5f.7a60)Internet address is 1.1.1.3/24MTU 1500 bytes, BW 27000 Kbit, DLY 1000 usec, rely 255/255, load 1/255Encapsulation, loopback not set, keepalive not setARP type: ARPA, ARP Timeout 04:00:00Last input 4d07h, output 00:00:00, output hang neverLast clearing of "show interface" counters neverQueueing strategy: fifoOutput queue 0/40, 0 drops; input queue 0/75, 0 drops5 minute input rate 0 bits/sec, 0 packets/sec5 minute output rate 0 bits/sec, 0 packets/sec10908 packets input, 855000 bytes, 0 no bufferReceived 3699 broadcasts, 0 runts, 0 giants, 0 throttles3 input errors, 3 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort5412 packets output, 646488 bytes, 0 underruns0 output errors, 0 collisions, 13082 interface resets0 output buffer failures, 0 output buffers swapped out
describes the fields shown in the show interface cable display.
The following is sample output for the downstream cable interface of slot 6 on port 0 from the show interface cable downstream command:
router# show interface cable 6/0 downstreamCable6/0: Downstream is up111947771 packets output, 1579682655 bytes, 0 discarded0 output errorsdescribes the fields shown in the show controllers cable downstream display.
The following is sample output for the upstream cable interface located in slot 6/port 0 from the show interface cable upstream command:
router# show interface cable 6/0 upstreamCable6/0: Upstream 0 is upReceived 3699 broadcasts, 0 multicasts, 28586 unicasts0 discards, 0 errors, 0 unknown protocol21817 packets error-free, 2371 corrected, 8097 uncorrectable0 noise, 0 microreflectionsCBR_queue_depth: [not implemented], ABR_queue_depth: [not implemented],UBR[1]_queue_depth: 0, UBR[2]_queue_depth: 0,UBR[3]_queue_depth: 0, POLLS_queue_depth: [not implemented]ADMIN_queue_depth: [not implemented]Last Minislot Stamp (current_time_base):190026 FLAG:1Last Minislot Stamp (scheduler_time_base):200706 FLAG:1describes the fields shown in the show interface cable upstream display.
Related Commands
You can use the master indexes or search online to find documentation of related commands.
show interface cable signal-quality
show interface cable sidshow interface cable signal-quality
To display information about the signal quality, use the show interface cable signal-quality Privileged EXEC command:
show interface cable slot/port signal-quality
Syntax Description
Command Mode
EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Sample Display
The following is sample output from the show interface signal quality command:
router# show interface cable 6/0 signal-qualityCable6/0: Upstream 0 is up includes contention intervals: TRUE
describes the fields shown in the show controllers cable upstream display.
Table 14 Show Interface Cable Signal Quality Command Field Descriptions
Cable
Interface name.
Upstream is up includes contention intervals
States whether this statement is true.
Related Commands
You can use the master indexes or search online to find documentation of related commands.
show interface
show interface cable downstream
show interface cable sid
show interface cable upstreamshow interfaces cable sid
To display information by service identifier (SID) of each cable modem on the network, use the show interface sid Privileged EXEC command:
show interfaces cable slot/port sid [sid-number]
Syntax Description
slot/port
Identifies the slot number and downstream port number.
sid-number
(Optional) Identifies the service identification number.
Command Mode
EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Sample Display
The following are sample outputs from two uses of the show interface cable sid command:
router# show interface cable 6/0 sidSID Status QoS Creattime Inoctets Inpackets IP address MAC address1 enable 2 57 80139964 101336 1.1.1.5 00e0.1eab.2c0b2 enable 2 57 49132 649 1.1.1.7 00e0.1eb2.bb073 enable 2 58 80042891 100555 1.1.1.2 00e0.1eab.2c29router#show interface cable 6/0 sid 1SID Status QoS Creattime Inoctets Inpackets IP address MAC address1 enable 2 57 80140204 101340 1.1.1.5 00e0.1eab.2c0bIf the value for the QoS group in the display appears as 0, it indicates that a temporary SID has been assigned to a cable modem that is in the process of connecting to the network:
router# show interface cable 6/0 sidSID Status QoS Creattime Inoctets Inpackets IP address MAC address1 enable 0 57 80140204 101340 1.1.1.5 00e0.1eab.2c0bIf there are no cable modems connected to the cable interface you have selected, the display will appear as follows:
router# show interface cable 6/0 sidSID Status QoS Creattime Inoctets Inpackets IP address MAC address1 Not in use
Note
describes the fields shown in the output for the show interface cable sid displays.
Related Commands
You can use the master indexes or search online to find documentation of related commands.
show interface cable signal-quality
show diag
To display the revision level information for the cable line card, use the show diag Privileged EXEC command.
show diag
Syntax Description
There are no arguments or keywords for this command.
Command Mode
Privileged EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Sample Display
The following is sample output from the show diag command displaying revision level information for the cable line card (Slot 6):
router#show diagSlot 6:MC11 port adapter, 1 portPort adapter is analyzedPort adapter insertion time 02:37:10 agoHardware Revision : 1.2Part Number : 800-02455-02Board Revision : 03Deviation Number : 0-3Fab Version : 03PCB Serial Number : 00004500239RMA Test History : 00RMA Number : 0-0-0-0RMA History : 00Calibration Data : Minimum: -8 dBmV, Maximum: 8 dBmVCalibration values : 0x5D43 0x3F05 0x1794Unknown Field (type 0083): 83 FF FF FFEEPROM format version 4EEPROM contents (hex):0x00: 04 FF 40 00 F1 41 01 02 C0 46 03 20 00 09 97 020x10: 42 30 33 80 00 00 00 03 02 03 C1 8B 30 30 30 300x20: 34 35 30 30 32 33 39 03 00 81 00 00 00 00 04 000x30: C8 09 F8 08 03 5D 43 3F 05 17 94 83 83 FF FF FF0x40: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x50: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x60: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x70: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FFdescribes the fields shown in the show diag display.
show c7200
To display the revision level information for the Cisco uBR7246 midplane, use the show c7200 Privileged EXEC command.
show c7200
Syntax Description
There are no arguments or keywords for this command.
Command Mode
Privileged EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 XA.
Sample Display
The following is sample output from the show c7200 command. The midplane EEPROM data describes the characteristics of the device's midplane chassis; the CPU EEPROM data describes the characteristics of the device's CPU. The fault history buffer data provides diagnostic information used only by Cisco Customer Support Engineers.
router#show c7200Network IO Interrupt Throttling:throttle count=0, timer count=0active=0, configured=0netint usec=3999, netint mask usec=200UBR7200 Midplane EEPROM:Number of Slots : 6Hardware Revision : 1.1Chassis MAC Address : 0008.cefb.fc00MAC Address block size : 256Unknown Field (type 01B9): 2C 1F E0 00Unknown Field (type 01B8): 85 FF FF FFEEPROM format version 4EEPROM contents (hex):0x00: 04 FF 40 00 F0 01 06 41 01 01 C3 06 00 08 CE FB0x10: FC 00 43 01 00 C7 20 45 53 00 29 00 2E 00 3D 000x20: 4C 00 34 00 36 00 87 00 81 00 83 00 86 00 84 000x30: B6 00 E0 00 00 B8 DB 00 B9 2C 1F E0 00 00 B8 850x40: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x50: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x60: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x70: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FFC7200 CPU EEPROM:Hardware revision 2.1 Board revision A0Serial number 4371856 Part number 73-1536-03Test history 0x0 RMA number 00-00-00EEPROM format version 1EEPROM contents (hex):0x20: 01 15 02 01 00 42 B5 90 49 06 00 03 00 00 00 000x30: 50 00 00 00 FF FF FF FF FF FF FF FF FF FF FF FFFault History Buffer:7200 Software (UBR7200-P-M), Experimental Version 11.3(19980514:205205)[johnchen-spydrman_2 232]Compiled Fri 12-Jun-98 19:20 by johnchenSignal = 23, Code = 0x24, Uptime 00:02:09$0 : 00000000, AT : 00000000, v0 : 00000000, v1 : 00000004a0 : 00000000, a1 : 0000FF00, a2 : 00000006, a3 : 00000002t0 : 00000020, t1 : 3401FF01, t2 : 3401C100, t3 : FFFF00FFt4 : 6027E180, t5 : 30443044, t6 : 30384330, t7 : 30783630s0 : 00000000, s1 : 608BFD88, s2 : 606D9E4C, s3 : 60B43E0Cs4 : 608BFD88, s5 : 0000004A, s6 : 00000000, s7 : 608BFF9Ct8 : 00009BCB, t9 : 00000000, k0 : 3041D001, k1 : BF800000gp : 6083B400, sp : 60BC4CA0, s8 : 608BFDF8, ra : 602797ECEP6027AE58, SREG : 3401FF03, Cause : 00000424Debug Commands
The following debug cable commands are available to troubleshoot the cable interfaces on the Cisco uBR7246:
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debug cable env
Use the debug cable env EXEC command to display information about the Cisco uBR7246 physical environment, including internal temperature, midplane voltages, fan performance, and power supply voltages. The no form of this command disables debugging output.
[no] debug cable env
Usage Guidelines
This command is used to debug the sensor circuitry used to measure internal temperature, midplane voltages, fan performance, and power supply voltages on the Cisco uBR7246 console.
Sample Display
Figure shows the sample debug cable env output.
ENVM: ps id=0xFF0, v=0x2050, r=0xC0AB, pstype=1> ENVM: ps id=0x2FD0, v=0x2050, r=0x24201, pstype=27> ENVM: Sensor 0: a2dref=131, a2dact=31, vref=12219, vact=1552> Alpha=8990, temp=27>Table 17 Sample Output for the debug cable env Command
Related Commands
You can use the master indexes or search online to find documentation of related commands.
show environment all
show environment last
show environment tabledebug cable err
Use the debug cable err EXEC command to display errors that occur in the cable MAC protocols. The no form of this command disables debugging output.
[no] debug cable err
Usage Guidelines
This command is used to display unexpected DOCSIS MAC protocol messages. When the
Cisco uBR7246 does not to expect to receive a specific MAC message, an error message and hex dump are printed. Other miscellaneous error conditions may result in output.Sample Display
Following is sample debug cable err output.
This is a UCD Message> This is a MAP Message> This is a RNG_RSP Message> This is a REG_RSP Message> This is a UCC_REQ Message> This is a BPKM_RSP Message> This is a TRI_TCD Message> This is a TRI_TSI Message> This is a unrecognized MCNS message>> ERROR:######TICKS PER MSLOT NOT POWER OF 2####debug cable keyman
Use the debug cable keyman EXEC command to activate debugging of tek and kek baseline privacy key activity. The no form of this command disables debugging output.
[no] debug cable keyman
Usage Guidelines
This command activates debugging of the tek and kek baseline privacy key activity. When this command is activated, all activity related to kek and tek keys will be displayed on the Cisco uBR7246 console. This command is used to display encryption key management debugging output.
Sample Display
Following is sample debug cable keyman output.
Read Verify DES failed with SID %2x> Verify key failed with SID %2x : setvalue = %llx, readback = %llx> Verify iv failed with SID %2x : setvalue = %llx, readback = %llx> Next TEK lifetime check is set to %u seconds.> Next Multicast TEK lifetime check is set to 1 seconds>> [UCAST_TEK] :", idbp->hw_namestring);> show_sid_key_chain(ds, &ds->mcast_sid_key_list_hdr);>> [MCAST_TEK] :", idbp->hw_namestring);> buginf("\nSID : %4x\t", sidkey->sid);> buginf("seq : %2x\t current : %2x\n", sidkey->key_seq_num,> sidkey->current_key_num);> buginf(" Status[0] : %x\tDES IV[0] : %llx\tKey Life[0]: %u sec\n",> sidkey->key_status[0], sidkey->des_key[0].iv,> compute_remain_lifetime(&sidkey->des_key[0]));>> buginf(" Status[1] : %x\tDES IV[1] : %llx\tKey Life[1]: %u sec\n",> sidkey->key_status[1], sidkey->des_key[1].iv,> compute_remain_lifetime(&sidkey->des_key[1]));>debug cable phy
Use the debug cable phy EXEC command to activate debugging of messages generated in the cable physical layer. The no form of this command disables debugging output.
[no] debug cable phy
Usage Guidelines
This command activates debugging of messages generated in the cable phy, which is the physical layer where upstream and downstream activity between the Cisco uBR7246 and the HFC network is controlled. When this command is activated, any messages generated in the cable phy will be displayed on the Cisco uBR7246 console.
Sample Display
Following is sample debug cable phy output.
cmts_phy_init: mac_version == BCM3210_FPGA>bcm3033_set_tx_sym_rate(5056941)>stintctl = 0x54484800>bcm3033_set_tx_if_freq(44000000)>stfreqctl = 0x5BAAAAAA>cmts_phy_init_us: U0 part_id = 0x3136, revid = 0x05, rev_id2 = 0x64>cmts_phy_init: mac_version == BCM3210_FPGAMedia access controller chip version.>bcm3033_set_tx_sym_rate(5056941)> stintctl = 0x54484800Physical layer symbol rate register value.>00:51:49: bcm3033_set_tx_if_freq(44000000)>00:51:49: stfreqctl = 0x5BAAAAAAPhysical layer intermediate frequency (IF) register value.>00:51:49: cmts_phy_init_us: U0 part_id = 0x3136, revid = 0x05, rev_id2 = 0x64Physical layer receiver chip part version.debug cable privacy
Use the debug cable privacy EXEC command to activate debugging of baseline privacy. The no form of this command disables debugging output.
[no] debug cable privacy
Usage Guidelines
This command activates debugging of baseline privacy. When this command is activated, any messages generated by the spectrum manager will be displayed on the Cisco uBR7246 console.
Sample Display
Following is sample debug cable privacy output.
Removing both odd and even keys for sid %x.>> Invalid Len for TLV_SERIAL_NUM_TYPE : %d.>> Invalid Len for TLV_MANUF_ID_TYPE : %d.>> Invalid Len for TLV_MANUF_ID_TYPE : %d.>debug cable qos
Use the debug cable qos EXEC command to activate quality of service debugging. The no form of this command disables debugging output.
[no] debug cable qos
Usage Guidelines
This command activates debugging of QoS. When this command is activated, any messages related to QoS parameters will be displayed on the Cisco uBR7246 console.
Sample Display
Following is sample debug cable qos output.
>CMTS_QOS_LOG_NO_MORE_QOS_INDEXModems cannot add more entries to the class of service table.>CMTS_QOS_LOG_NOMORE_QOSPRF_MEMMemory allocation error when creating class of service table entry.>CMTS_QOS_LOG_NO_CREATION_ALLOWEDClass of service entry cannot be created by modem. Use CLI or SNMPinterface instead of the modem's TFTP configuration file.>CMTS_QOS_LOG_CANNOT_REGISTER_COS_SIDA service identifier (SID) could not be assigned to the registering modem.>CMTS_QOS_LOG_CANNOT_DEREGISTER_COS_SIDThe modem's service identifier (SID) was already removed.>CMTS_QOS_LOG_MSLOT_TIMEBASE_WRAPPEDThe 160 KHz timebase clock drives a 26-bit counter which wraps aroundapproximately every 7 minutes. This message is generated every time itwraps around.debug cable range
Use the debug cable range EXEC command to display ranging messages from cable modems on the HFC network. The no form of this command disables debugging output.
[no] debug cable range
Usage Guidelines
This command activates debugging of ranging messages from cable modems on the HFC network. When this command is activated, any ranging messages generated when cable modems request or change their upstream frequencies will be displayed on the Cisco uBR7246 console. Use this command to display the details of the initial and station maintenance procedures. The initial maintenance procedure is used for link establishment. The station maintenance procedure is used for link keep-alive monitoring.
Sample Display
Following are samples of debug cable range output.
>Got a ranging request>SID value is 0 on Interface Cable3/0/U0>CM mac address 00:10:7B:43:AA:21 Timing offset is 3312>3E 1E 3F FF 00 00 59 BF 01 15 F8 01 A7 00 0C F0Output when a modem first seeks to establish a link to the Cisco uBR7246. The SID value of 0 indicates that the modem has no assigned service identifier. The "CM mac address" is"the MAC address of the modem's radio frequency (RF) interface, not its Ethernet interface. The "Timing offset" is a measure of the distance between the modem and the Cisco uBR7246 expressed in 10.24 MHz clocks. This value is adjusted down to zero by the maintenance procedures. The first 16 bytes of the prepended header of the message are dumped in hexadecimal.
CM mac address 0010.7b43.aa21>found..Assigned SID #2 on Interface Cable3/0/U0>Timing offset is CF0>Power value is 15F8, or -1 dB>Freq Error = 423, Freq offset is 1692>Ranging Modem with Sid 2 on i/f : Cable3/0/U0Output when the modem is first assigned a SID during initial maintenance.
>Initial Range Message Received on Interface Cable3/0/U0>CMTS reusing old sid : 2 for modem : 0010.7b43.aa21>Timing offset is CF0>Power value is 15F8, or -1 dB>Freq Error = 423, Freq offset is 1692>Ranging Modem with Sid 2 on i/f : Cable3/0/U0Output when the modem is reassigned the same SID during initial maintenance.
>Ranging Modem with Sid 2 on i/f : Cable3/0/U0>>Got a ranging request>SID value is 2 on Interface Cable3/0/U0>CM mac address 00:10:7B:43:AA:21>Timing offset is 0>Power value is 1823, or -1 dB>Freq Error = 13, Freq offset is 0>Ranging has been successful for SID 2 on Interface Cable3/0/U0Output when the modem is polled by the uBR7246 during station maintenance. Polling happens at a minimum rate of once every 10 seconds.
debug cable reset
Use the debug cable reset EXEC command to display reset messages from cable interfaces. The no form of this command disables debugging output.
[no] debug cable reset
Usage Guidelines
This command activates display of reset messages from cable interfaces.
Sample Display
Following is sample debug cable reset output.
>Resetting CMTS interface.Output when the interface is reset due to complete loss of receive packets.
debug cable specmgmt
Use the debug cable specmgmt EXEC command to debug spectrum management (frequency agility) on the HFC network. The no form of this command disables debugging output.
[no] debug cable specmgmt
Usage Guidelines
This command activates debugging of spectrum management (frequency agility) on the HFC network. When this command is activated, any messages generated due to spectrum group activity will be displayed on the Cisco uBR7246 console. Spectrum group activity can be additions or changes to spectrum groups, or frequency and power lever changes controlled by spectrum groups.
Sample Display
Following is sample debug cable specmgmt output.
>cmts_next_frequency(0x60A979AC, 1, 1)Frequency hop was commanded.
>add_interface_to_freq(0x60BD3734, 0x60C44F68)Interface was added to a frequency's interface list.
>set_upstream(0x60A979AC,1,21000000,-5)Spectrum management has set an upstream port's frequency and power level.
>cmts_frequency_hop_decision(0x60B57FEC)An interface was checked for a frequency hop decision.
debug cable startalloc
Use the debug cable startalloc EXEC command to debug channel allocations on the HFC network. The no form of this command disables debugging output.
[no] debug cable startalloc
Usage Guidelines
This command activates debugging of any channel allocations on the HFC network. When this command is activated, any messages generated when channels are allocated to cable modems on the HFC network will be displayed on the Cisco uBR7246 console.
Sample Display
Following is sample debug cable startalloc output.
>MAP startalloc adjusted by <n> mslotsIndicates time-slot MAP processing is active.
debug cable ucc
Use the debug cable ucc EXEC command to debug upstream channel change (UCC) messages generated when cable modems request or are assigned a new channel. The no form of this command disables debugging output.
[no] debug cable ucc
Usage Guidelines
This command activates debugging of any upstream channel change (UCC) messages generated when cable modems request or are assigned a new channel. When this command is activated, any messages related to upstream channel changes will be displayed on the Cisco uBR7246 console.
Sample Display
Following is sample debug cable ucc output.
>SID 2 has been registered>>Mac Address of CM for UCC> 00:0E:1D:D8:52:16>>UCC Message Sent to CM>>Changing SID 2 from upstream channel 1 to upstream channel 2Output when moving modem from one upstream channel to another.
debug cable ucd
Use the debug cable ucd EXEC command to debug upstream channel descriptor (UCD) messages. The no form of this command disables debugging output.
[no] debug cable ucd
Usage Guidelines
This command activates debugging of any upstream channel descriptor (UCD) messages. UCD messages contain information about upstream channel characteristics and are sent to the cable modems on the HFC network. Cable modems that are configured to use enhanced upstream channels use these UCD messages to identify and select an enhanced upstream channel to use. When this command is activated, any messages related to upstream channel descriptors will be displayed on the Cisco uBR7246 console.
Sample Display
Following is sample debug cable ucd output.
UCD MESSAGE-----------FRAME HEADERFC - 0xC2 ==MAC_PARM - 0x00LEN - 0xD3MAC MANAGEMENT MESSAGE HEADERDA - 01E0.2F00.0001SA - 0009.0CEF.3730msg LEN - C1DSAP - 0SSAP t - 0control - 03version - 01type - 02 ==US Channel ID - 1Configuration Change Count - 5Mini-Slot Size - 4DS Channel ID - 1Symbol Rate - 8Frequency - 10000000Preamble Pattern - CC CC CC CC CC CC CC CC CC CC CC CC CCCC 0D 0DBurst Descriptor 0Interval Usage Code - 1Modulation Type - 1 == QPSKDifferential Encoding - 2 == OFFPreamble Length - 64Preamble Value Offset - 56FEC Error Correction - 0FEC Codeword Length - 16Scrambler Seed - 0x0152Maximum Burst Size - 2Guard Time Size - 8Last Codeword Length - 1 == FIXEDScrambler on/off - 1 == ONBurst Descriptor 1Interval Usage Code - 3Modulation Type - 1 == QPSKDifferential Encoding - 2 == OFFPreamble Length - 128Preamble Value Offset - 0FEC Error Correction - 5FEC Codeword Length - 34Scrambler Seed - 0x0152Maximum Burst Size - 0Guard Time Size - 48Last Codeword Length - 1 == FIXEDScrambler on/off - 1 == ONBurst Descriptor 2Interval Usage Code - 4Modulation Type - 1 == QPSKDifferential Encoding - 2 == OFFPreamble Length - 128Preamble Value Offset - 0FEC Error Correction - 5FEC Codeword Length - 34Scrambler Seed - 0x0152Maximum Burst Size - 0Guard Time Size - 48Last Codeword Length - 1 == FIXEDScrambler on/off - 1 == ONBurst Descriptor 3Interval Usage Code - 5Modulation Type - 1 == QPSKDifferential Encoding - 2 == OFFPreamble Length - 72Preamble Value Offset - 48FEC Error Correction - 5FEC Codeword Length - 75Scrambler Seed - 0x0152Maximum Burst Size - 0Guard Time Size - 8Last Codeword Length - 1 == FIXEDScrambler on/off - 1 == ONThe UCD MESSAGE is :0xC2 0x00 0x00 0xD3 0x00 0x00 0x01 0xE00x2F 0x00 0x00 0x01 0x00 0x09 0x0C 0xEF0x37 0x30 0x00 0xC1 0x00 0x00 0x03 0x010x02 0x00 0x01 0x05 0x04 0x01 0x01 0x010x08 0x02 0x04 0x00 0x98 0x96 0x80 0x030x10 0xCC 0xCC 0xCC 0xCC 0xCC 0xCC 0xCC0xCC 0xCC 0xCC 0xCC 0xCC 0xCC 0xCC 0x0D0x0D 0x04 0x25 0x01 0x01 0x01 0x01 0x020x01 0x02 0x03 0x02 0x00 0x40 0x04 0x020x00 0x38 0x05 0x01 0x00 0x06 0x01 0x100x07 0x02 0x01 0x52 0x08 0x01 0x02 0x090x01 0x08 0x0A 0x01 0x01 0x0B 0x01 0x010x04 0x25 0x03 0x01 0x01 0x01 0x02 0x010x02 0x03 0x02 0x00 0x80 0x04 0x02 0x000x00 0x05 0x01 0x05 0x06 0x01 0x22 0x070x02 0x01 0x52 0x08 0x01 0x00 0x09 0x010x30 0x0A 0x01 0x01 0x0B 0x01 0x01 0x040x25 0x04 0x01 0x01 0x01 0x02 0x01 0x020x03 0x02 0x00 0x80 0x04 0x02 0x00 0x000x05 0x01 0x05 0x06 0x01 0x22 0x07 0x020x01 0x52 0x08 0x01 0x00 0x09 0x01 0x300x0A 0x01 0x01 0x0B 0x01 0x01 0x04 0x250x05 0x01 0x01 0x01 0x02 0x01 0x02 0x030x02 0x00 0x48 0x04 0x02 0x00 0x30 0x050x01 0x05 0x06 0x01 0x4B 0x07 0x02 0x010x52 0x08 0x01 0x00 0x09 0x01 0x08 0x0A0x01 0x01 0x0B 0x01 0x01
