Table Of Contents
Cisco uBR7246 Universal Broadband Router Feature Enhancements
cable flap-list insertion-time
cable flap-list power-adjust threshold
cable spectrum-group frequency
cable spectrum-group hop period
cable spectrum-group hop threshold
cable upstream admission-control
cable upstream modulation-profile
show interface cable signal-quality
Cisco uBR7246 Universal Broadband Router Feature Enhancements
Feature Summary
The enhancements to the Cisco uBR7246 cable router extend and improve the command line interface (CLI). They support burst profile, quality of service (QoS), improved parameter configuration, the MC11 modem card, and the MC16 modem card.
Downstream QoS handling is compliant with Multimedia Cable Network System (MCNS) requirements, and upstream QoS handling and Spectrum Management have been improved.
The Cisco uBR7246 now supports multicast authentication via RADIUS, and security has been enhanced for baseline privacy, including MCNS Data Over Cable System Interface Specification (DOCSIS) compliance. Also, this cable router now supports Dynamic Host Configuration Protocol (DHCP) Relay Subscriber ID Insertion.
Benefits
These enhancements to the Cisco uBR7246 cable router bring value to the digital broadband network by:
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Supporting burst profile configuration.
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Supported Platforms
This feature is supported on the Cisco uBR7246 router only.
Prerequisites
Before configuring the feature enhancements, complete the basic configuration of the Cisco uBR7246 as described in the Cisco uBR7246 Universal Broadband Router Installation and Configuration Guide and the Voice, Video, and Home Applications Configuration Guide.
Supported MIBs and RFC
The Cisco uBR7246 feature enhancements support the Radio Frequency (RF) Interface Management Information Base (MIB). For descriptions of supported MIBs and how to use MIBs, see Cisco's MIB website on Cisco Connection Online (CCO) at the following URL: http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.
No RFCs are supported by this feature.
List of Terms and Acronyms
Amplifier—Used on coaxial segments of a Community Antenna Television (CATV) plant to restore signal levels lost due to attenuation through distance. Unfortunately, amplifiers amplify noise as well as signal.
Branch Line—A coaxial cable that runs from a trunk line to a subscriber drop point. A branch line is also known as "Feeder Cable."
Cable Modem—Any device that modulates and demodulates digital data onto a CATV plant.
Cable Line Card—Modem front-end card of the cable router headend unit, plugged into the midplane. Each Cable Line Card provides a number of radio frequency (RF) channels as external interfaces.
Cable Router—A modular chassis-based router optimized for the data-over-CATV hybrid fiber-coaxial (HFC) application.
CATV—Originally Community Antenna Television. Now used to refer to any cable-based (coaxial/fiber) system provision of television services.
CDM—Cable Data Modem.
CDMTS, CMTS—Cable (Data) Modem Termination System.
Channel—A specific frequency allocation and bandwidth. Downstream channels used for television in the US are 6 MHz wide. In Europe, downstream channel width is 8 MHz.
CLI—Command line interface.
Combiner Group—The return paths of several fiber nodes can be combined at a single point to form one RF domain. This single point is called a combiner group. See also Spectrum Group.
CPE—Customer Premises Equipment. In the Cable Router application, this will usually be one or multiple PCs located at the customer side.
Distribution Hub—A smaller or remote headend distribution point for a CATV system. Video signals are received here from another site (headend), and redistributed. Sometimes a small number of locally originated signals are added. Such signals can be city information channels, HFC cable modem signals, and so forth.
Downstream—Set of frequencies used to send data from a headend to a subscriber.
Drop—A subscriber access point. The actual coaxial connection in the subscriber's home.
Fiber Node, Node—An optical node located in the outside plant distribution system which terminates the fiber-based downstream signal as an electrical signal onto a coaxial RF cable. Each fiber node is defined to support a certain serving area, either defined by number of homes passed or total amplifier cascade (number of active amplifiers in the longest line from the node to the end of the line).
Headend—Central distribution point for a CATV system. Video signals are received here from satellite (either co-located or remote), and the frequency is converted to the appropriate channels. Channels are then combined with locally originated signals, and rebroadcast onto the hybrid fiber-coaxial (HFC) plant. For a CATV data system, the headend is the typical place to link the HFC system and any external data networks.
HFC—Hybrid fiber-coaxial. Older CATV systems were provisioned using only coaxial cable. Modern systems use fiber transport from the headend to an optical node located in the neighborhood to reduce system noise. Coaxial cable runs from the node to the subscriber. The fiber plant is generally a star configuration with all optical node fibers terminating at a headend. The coaxial cable part of the system is generally a trunk and branch configuration.
Homes Passed—Number of homes or offices potentially serviceable by a cable system either on a per node or per system basis.
Midsplit—A frequency allocation plan where 5 to 108 MHz is used for upstream data and 178+ MHz is used for downstream data.
Optical Node—A device used to convert broadband RF (for example, television signals) to and from a fiber optic signal. An optical node is typically located in the outside field.
Predator—Code name for the Cisco 7200 class of modular routers that accept PCI bus-based port adapters.
QAM—Modulation scheme mostly used in the downstream direction (QAM-64, QAM-256). QAM-16 is expected to be usable in the upstream direction. Numbers indicate number of code points per symbol. Number of bits per symbol can be computed by 2(number of bits/symbol) = number of code points.
QPSK—Modulation scheme used in the upstream direction. Supports two data bits per symbol.
Spectrum Group—A combiner group can be associated with a frequency hop table. This frequency hop table associated with a combiner group is the spectrum group, as opposed to the RF topology point, which is the combiner group. See also Combiner Group.
Subsplit—A frequency allocation plan where 0 to 42 MHz is used for upstream data and 50+ MHz is used for downstream data.
Tap—A passive device that divides the signal between the trunk or feeder lines and splits the signal into ports for subscriber drop access.
Telephony Return—A variant of a cable data system where the return path from the subscriber cable modem is routed over a dialup (or ISDN) connection instead of over an upstream channel.
Trunk Line—A CATV backbone coaxial cable. This runs from an Optical Node and through a specific neighborhood or serving area.
Upstream—The set of frequencies used to send data from a subscriber to the headend.
Configuration Tasks
The basic configuration tasks required by this version of the Cisco uBR7246 cable router are the same as those described in the Cisco uBR7246 Universal Broadband Router Installation and Configuration Guide and the Voice, Video, and Home Applications Configuration Guide.
Additional configuration tasks are:
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Configuring Spectrum Groups
You can configure upstream frequency hop tables using cable spectrum-group commands. Start by determining which upstream ports are assigned to a combiner group. Then apply the following steps to configure a spectrum group:
Configuring Frequency Hopping
To configure frequency hopping, apply the following steps:
After you have established basic operation, inject a tone to the upstream port. For example, if the upstream frequency is currently 22.4 MHz, inject a 22.4 MHz tone at approximately the same power level as the modem. (If the power level at the modem is 40 dBmV, set the tone power to 40 dBmV.) The interfering carrier should shut down the channel and cause the frequency to change to the next configured value. In this example, it would be 24.0 MHz.
If you do not have an RF tone generator, use another line card and modem that caries traffic. Connect the upstream to the same combiner group, and use the data carrier as an interfering signal by setting it to the same frequency. For example, to test frequency hopping on c3/0, install c4/0 and connect both upstreams together using a combiner. If the upstream frequency of c3/0 is currently 22.4 Mhz, set c4/0 to 22.4 Mhz while c4/0 is carrying traffic. This should force c3/0 to change the frequency to the next configured value.
Verifying
The verification tasks required by this version of the Cisco uBR7246 cable router are the same as those described in the Cisco uBR7246 Universal Broadband Router Installation and Configuration Guide and the Voice, Video, and Home Applications Configuration Guide.
Note the following:
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Configuration Examples
To illustrate configuring spectrum groups, assume that an MC16 card is in slot 3 and is named cable3/0. Its upstream ports are named U0 through U5. You want ports U0 through U3 to belong to one combiner group, and ports U4 and U5 to belong to a different combiner group because of higher subscriber penetration. In both combiner groups, the allocated spectrum should be three 3.2 MHz slots centered at 21.6, 24.8, and 28.0 MHz. The allocated spectrum is 20.0 to 29.6 MHz. From global configuration mode, enter the configure terminal command. Then enter:
router(config)# cable spectrum-group 1 frequency 21600000router(config)# cable spectrum-group 1 frequency 24800000router(config)# cable spectrum-group 1 frequency 28000000router(config)# cable spectrum-group 2 sharedrouter(config)# cable spectrum-group 2 frequency 21600000router(config)# cable spectrum-group 2 frequency 24800000router(config)# cable spectrum-group 2 frequency 28000000Spectrum group 1 will be used for ports U0 through U3. Spectrum group 2 will be used for ports U4 and U5. Because ports U4 and U5 belong to the same combiner group, spectrum group 2 is configured as shared. The shared keyword prevents frequency collision.
To assign the upstream ports to the frequency hop tables for slot 3, enter:
router(config)# interface Cable3/0Then enter:
router(config-if)# cable u0 spectrum-group 1router(config-if)# cable u1 spectrum-group 1router(config-if)# cable u2 spectrum-group 1router(config-if)# cable u3 spectrum-group 1router(config-if)# cable u4 spectrum-group 2router(config-if)# cable u5 spectrum-group 2The upstream ports are assigned frequencies from their respective spectrum groups. Ports U0 through U3 will be set to 21.6 MHz. Ports U4 and U5 will be set to 21.6 and 24.8 MHz, respectively.
For additional configuration examples, refer to the Cisco uBR7246 Universal Broadband Router Installation and Configuration Guide and the Voice, Video, and Home Applications Configuration Guide.
Command Reference
This section documents new or modified commands. All other commands used with this feature are documented in the Cisco IOS Release 11.3 command references.
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cable 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 | 256qam}
Syntax Description
64qam
Modulation is 6 bits per downstream symbol rate.
256qam
Modulation is 8 bits per downstream symbol rate.
Default
64qam
Command Mode
Cable interface configuration
Command History
Usage Guidelines
Downstream modulation defines the modulation type used for downstream traffic. Specifying the symbol rate indirectly influences the interface speed; at 64qam, the interface speed is 6xx bits/second. Specifying 256qam sets the interface speed to 8xx bits/second.
Example
The following example sets the downstream modulation:
Router(config)# interface cable 6/0Router(config-if)# cable downstream modulation 256qamcable downstream rate-limit
To enable Data Over Cable Services Interface Specification (DOCSIS) rate limiting on downstream traffic, use the cable downstream rate-limit interface configuration command. Use the no form of this command to disable DOCSIS rate-limiting on downstream traffic.
cable downstream rate-limit [token-bucket | weighted-discard] [exp-weight]
no cable downstream rate-limitSyntax Description
Default
cable downstream rate-limit, which enforces strict DOCSIS-complaint rate limiting.
Command Mode
Interface configuration
Command History
Usage Guidelines
When you enter this command without an option, it enables strict DOCSIS-compliant rate limiting, which sets the burst rate to the interface speed.
Example
The following example applies the token bucket filter algorithm:
Router(config-if)# cable downstream rate-limit token-bucketRelated Commands
cable flap-list aging
To specify the number of days to age the cable modem from the flap-list table, use the cable flap-list aging global configuration command. Use the no form of this command to disable this feature.
cable flap-list aging number of days
no cable flap-list agingSyntax Description
number of days
Specifies how many days of cable modem performance is retained in the flap list. Valid values are from 1 to 60.
Default
No default behavior or values.
Command Mode
Global configuration
Command History
Usage Guidelines
A flap list is a table maintained by the Cisco uBR7246 for every modem (active or not) that is having communication difficulties. The cable flap list tracks the cable modem MAC address up and down transitions, registration events, missed periodic ranging packets, upstream power adjustments, and the CMTS physical interface. (Flapping refers to the rapid disconnecting and reconnecting of a cable modem that is having problems holding a connection.) The flap list contains modem MAC addresses and logs the time of the most recent activity. You can configure the size and entry thresholds for the flap list.
Example
The following example specifies that the flap-list table retain two days of performance for this cable modem:
Router(config)# cable flap-list aging 2Related Commands
cable flap-list insertion-time
To set the insertion time interval, use the cable flap-list insertion-time global configuration command. Use the no form of this command to disable insertion time.
cable flap-list insertion-time seconds
no cable flap-list insertion-timeSyntax Description
Default
No default behavior or values.
Command Mode
Global configuration
Command History
Usage Guidelines
This command controls the operation of a flapping modem detector. When the link establishment rate of a modem is shorter than the period defined by this command, the modem is placed in the flap list.
Example
The following example sets the insertion time interval to 62 seconds:
Router(config)# cable flap-list insertion-time 62Related Commands
cable flap-list power-adjust threshold
To specify the power-adjust threshold for recording a flap-list event, use the cable flap-list power-adjust threshold global configuration command. Use the no form of this command to disable power-adjust thresholds.
cable flap-list power-adjust threshold dBmV
no cable flap-list power-adjust thresholdSyntax Description
Default
No default behavior or values.
Command Mode
Global configuration
Command History
Usage Guidelines
This command controls the operation of a flapping modem detector. When the power adjustment of a modem exceeds the threshold, the modem is placed in the flap list.
Example
The following example shows the power-adjust threshold to 1:
Router(config)# cable flap-list power-adjust threshold 1Related Commands
cable flap-list size
To specify the maximum number of modems reported in the flap-list table, use the cable flap-list size global configuration command. Use the no form of this command to specify the default flap-list table size.
cable flap-list size number
no cable flap-list sizeSyntax Description
number
Specifies the number of modems that report flap performance to the flap-list table. Valid values are from 1 to 8191.
Default
The default cable flap-list size is 8192.
Command Mode
Global configuration
Command History
Example
The following example limits the flap-list table size to no more than 2 modems:
Router(config)# cable flap-list size 2Related Commands
cable helper-address
To specify a destination address for User Datagram Protocol (UDP) broadcast (DHCP) packets, use the cable helper-address interface configuration command. Use the no form of this command to disable this feature.
cable helper-address IP-address {cable-modem | host}
no cable helper-address IP-address {cable-modem | host}Syntax Description
IP-address
The IP address of a DHCP server.
cable-modem
Specifies that only cable modem UDP broadcasts are forwarded.
host
Specifies that only host UDP broadcasts are forwarded.
Default
No default behavior or values.
Command Mode
Interface configuration
Command History
Usage Guidelines
If you specify a secondary interface address, the giaddr field in the DHCP requests will be sent to the primary address for DHCP requests received from cable modems, and to the secondary IP address for DHCP requests received from hosts.
Examples
The following example forwards UDP broadcasts from cable modems to the DHCP server at 172.23.66.44:
Router(config-if)# cable helper-address 172.23.66.44 cable-modemThe following example forwards UDP broadcasts from hosts to the DHCP server at 172.23.66.44:
Router(config-if)# cable helper-address 172.23.66.44 hostcable insertion-interval
To set the time between opportunities for cable modems to request a connection from the Cisco uBR7246, use the cable insertion-interval interface configuration command. Use the no form of this command to use the automatic setting and ignore any minimum or maximum time settings.
cable insertion-interval [automatic] [min | max]
no cable insertion-intervalSyntax Description
Default
automatic (dynamically varying the frequency of initial ranging upstream slots between 50 milliseconds to 2 seconds).
Command Mode
Interface configuration
Command History
Usage Guidelines
Use this command to configure the frequency at which the initial maintenance interval is to appear in MAP messages. MAP messages define the precise time intervals during which modems can transmit.
Use the automatic keyword with this command when you have to bring a lot of modems on line quickly (for example, after a major power failure). Override the automatic keyword by specifying an insertion interval.
Example
The following example specifies the automatic setting:
Router(config-if)# cable insertion-interval automaticRelated Commands
Sets the time interval that a modem must wait after a failed attempt to connect to the uBR7246.
cable match address
To specify that IP multicast streams be encrypted, use the cable match address interface configuration command. Use the no form of this command if you do not want to use encryption.
cable match address access-list
no cable match addressSyntax Description
Default
No default behavior or values.
Command Mode
Interface configuration
Command History
Usage Guidelines
Configure the access list using the ip access-list command.
Examples
The following example specifies that the multicast stream defined by the access list named reno be encrypted:
Router(config-if)# cable match address renoThe following example specifies that the multicast stream defined by the access list number 102 be encrypted:
Router(config-if)# cable match address 102Related Commands
cable modulation-profile
To define the modulation profile, use the cable modulation-profile global configuration command. Use the no form of this command to remove the specified modulation profile.
cable modulation-profile profile iuc fec-tbytes fec-len burst-len guard-t mod scrambler seed diff pre-len last-cw uw-len
no cable modulation-profile profile iuc fec-tbytes fec-len burst-len guard-t mod scrambler seed diff pre-len last-cw uw-lenSyntax Description
Default
No default behavior or values.
Command Mode
Global configuration
Command History
Usage Guidelines
You can use the no form of this command to remove all modulation profiles except modulation profile 1. In the case of modulation profile 1, the no form of this command sets all of the parameters in a burst to default values.
CautionChanges to modulation profiles causes changes to the physical layer. Because changing physical layer characteristics affects router performance and function, this task should be reserved for expert users.
Example
The following example defines the burst parameters for profile 2 as follows:
The request burst is defined to have 0 fec-tbytes, 16 kbytes fec-len, a burst-len of 1, a guard time of 8, a mod value of qpsk, scrambler enabled with a seed value of 152, differential encoding disabled, a preamble length of 64 bits, a fixed code word length, and 8-bit unique words for upstream unique word length. The remaining initial, station, short, and long bursts are defined in similar fashion for profile 2.
Router(config)# cable modulation-profile 2 request 0 16 1 8 qpsk scrambler 152 no-diff 64 fixed uw8Router(config)# cable modulation-profile 2 initial 5 34 0 48 qpsk scrambler 152 no-diff 128 fixed uw16Router(config)# cable modulation-profile 2 station 5 34 0 48 qpsk scrambler 152 no-diff 128 fixed uw16Router(config)# cable modulation-profile 2 short 6 75 6 8 16qam scrambler 152 no-diff 144 fixed uw8Router(config)# cable modulation-profile 2 long 8 220 0 8 16qam scrambler 152 no-diff 160 fixed uw8
Note
See the show cable modulation-profile command for a description of the output display fields.
Related Commands
Assigns a modulation profile to an interface.
Displays a modulation profile group's information.
cable privacy
To enable privacy in the system, use the cable privacy interface configuration command. Use the no form of this command to disable privacy.
cable privacy [mandatory | authenticate-modem | authorize-multicast]
no cable privacySyntax Description
Default
mandatory
Command Mode
Interface configuration
Command History
Usage Guidelines
While the default for this command is to enable privacy, it is not mandatory.
Examples
The following example displays the options available with this command:
Router(config-if)# cable privacy ?authenticate-modem turn on BPI modem authenticationauthorize-multicast turn on BPI multicast authorizationkek KEK Key Parmsmandatory force privacy be mandatorytek TEK Key ParmsThe following example forces Baseline Privacy to be used for all modems:
Router(config-if)# cable privacy mandatoryThe following example turns on BPI modem authentication:
Router(config-if)# cable privacy authenticate-modemThe following example turns on BPI muticast authorization:
Router(config-if)# cable privacy authorize-multicastRelated Commands
cable qos permission
To specify permission for updating the QoS table, use the cable qos permission global configuration command. Use the no form of this command to remove a previously enabled permission.
cable qos permission {create-snmp | modems | update-snmp}
no cable qos permissionSyntax Description
Default
Enable by modem and SNMP.
Command Mode
Global configuration
Command History
Example
The following example enables modems to request arbitrary QoS parameters:
Router(config)# cable qos permission modemsRelated Commands
Configures a quality of service (QoS) profile.
Displays the status of the QoS table permissions.
Displays QoS profiles.
cable qos profile
To configure a QoS profile, use the cable qos profile global configuration command. Use the no form of this command to either set default values for profile group numbers 1 or 2, or remove the QoS profile if no specific parameters remain.
cable qos profile {groupnum | guaranteed-upstream | max-burst | max-upstream | max-downstream | priority | tos-overwrite | value}
no cable qos profile {groupnum | guaranteed-upstream | max-burst | max-downstream | priority | tos-overwrite | value}Syntax Description
Default
No default behavior or values.
Command Mode
Global configuration
Command History
Example
The following example configures QoS profile 4 with guaranteed upstream of 2 kbps, maximum transmission burst of 2, maximum downstream rate of 3 kbps, with a priority of 4, cable baseline privacy set, and a tos-overwrite mask and value byte (in hex) of 0x2:
Router(config)# cable qos profile 4 guaranteed-upstream 2Router(config)# cable qos profile 4 max-burst 2Router(config)# cable qos profile 4 max-downstream 3Router(config)# cable qos profile 4 priority 4Router(config)# cable qos profile 4 tos-overwrite 0x2Related Commands
cable relay-agent-option
To enable the system to insert the cable modem MAC address into a DHCP packet received from a modem or host and forward the packet to a DHCP server, use the cable relay-agent-option interface configuration command. Use the no form of this command to disable insertion.
cable relay-agent-option
no cable relay-agent-optionSyntax Description
This command has no keywords or arguments.
Default
no cable relay-agent-option
Command Mode
Interface configuration
Command History
Usage Guidelines
This functionality enables a DHCP server to identify the user (cable modem) sending the request and initiate appropriate action based on this information.
Example
The following example enables the insertion of DHCP relay agent information into DHCP packets:
Router(config-if)# cable relay-agent-optioncable shared-secret
To configure authentication and data privacy parameters, use the cable shared-secret interface configuration command. Use the no form of this command to disable authentication during the modem's registration phase.
cable shared-secret [0 | 7] authentication-key
no cable shared-secretSyntax Description
Default
no cable shared-secret
Command Mode
Interface configuration
Command History
Example
The following example activates cable modem authentication, using "3344912349988...sf" as the shared secret key and indicating that an encrypted message follows:
router(if-config)# cable shared-secret 7 3344912349988cisco@xapowenaspasdpuy230jhm...sfcable spectrum-group band
To configure a continuous band setting for a spectrum group, use the cable spectrum-group band global configuration command. Use the no form of this command to delete the band settings for a spectrum group.
cable spectrum-group group-number [time day hh:mm:ss] [delete] band start-freq-hz end-freq-hz [power-level-dbmv]
no cable spectrum-group group-numberSyntax Description
Default
No default behavior or values.
Command Mode
Global configuration
Command History
Usage Guidelines
This command specifies that a continuous band setting be used as a unit of allocated spectrum within this spectrum group. Cable plants can choose to set up a daily schedule that changes the input power level and not the frequency.
Examples
The following example specifies that all the upstream ports for spectrum-group 4 share the same spectrum from 5000004 Hz to 40000000 Hz with a power level of 5 dBmV on Mondays at noon:
Router(config)# cable spectrum-group 4 time Monday 12:00:00 band 5000004 40000000 5The following example deletes the frequency band created in the previous example:
Router(config)# cable spectrum-group 4 time Monday 12:00:00 delete band 5000004 40000000 5cable spectrum-group frequency
To configure a spectrum group to use a center frequency, use the cable spectrum-group frequency global configuration command. Use the no form of this command to delete the configured frequency setting for this spectrum group.
cable spectrum-group groupnum [time day hh:mm:ss] [delete] frequency freq-hz [dBmV]
no cable spectrum-group groupnum [time day hh:mm:ss] [delete] frequency freq-hz [dBmV]Syntax Description
Default
No default behavior or values.
Command Mode
Global configuration
Command History
Usage Guidelines
A spectrum group allows the upstream frequency and input power level to change whenever noise impairs upstream traffic.
Cable plants can choose to set up a daily schedule that changes the input power level and not the frequency.
Example
The following example configures spectrum group 4 with an upstream frequency of 5000004 Hz and a power level of 5 dBmV:
Router(config)# cable spectrum-group 4 frequency 5000004 5cable spectrum-group hop period
To set the frequency-hop period, use the cable spectrum-group hop period global configuration command. Use the no form of this command to delete the frequency hop period for this spectrum group.
cable spectrum-group groupnum hop period seconds
no cable spectrum-group groupnum hop periodSyntax Description
groupnum
Spectrum group number. Valid values are from 1 to 32.
seconds
Specifies the frequency-hop time period in seconds. Valid values are from 1 to 3600.
Default
300 seconds
Command Mode
Global configuration
Command History
Example
The following example sets the frequency-hop period to 60 seconds:
Router(config)# cable spectrum-group hop period 60Related Commands
cable spectrum-group hop threshold
To specify a hop threshold for a spectrum group, use the cable spectrum-group hop threshold global configuration command. Use the no form of this command to delete the hop threshold for this spectrum group.
cable spectrum-group groupnum hop threshold [percent]
no cable spectrum-group groupnum hop thresholdSyntax Description
groupnum
Spectrum group number. Valid values are from 1 to 32.
percent
(Optional) Specifies the hop threshold in percentage of capacity. Valid range of modems used is 1 to 100.
Default
100 percent
Command Mode
Global configuration
Command History
Example
The following example sets the threshold which triggers frequency hop to 20% for
spectrum-group 4:Router(config)# cable spectrum-group 4 hop threshold 20Related Commands
cable spectrum-group shared
To specify that the upstream ports share the same spectrum, use the cable spectrum-group shared global configuration command. Use the no form of this command to delete the spectrum group.
cable spectrum-group groupnum shared
no cable spectrum-group groupnum sharedSyntax Description
Default
Upstream port frequency the same for all ports in the spectrum group.
Command Mode
Global configuration
Command History
Usage Guidelines
Because this command forces upstream ports to use the same spectrum, do not use this command for overlapping carriers.
Example
The following example specifies that all the upstream ports for spectrum-group 4 share the same spectrum:
Router(config)# cable spectrum-group 4 sharedcable upstream admission-control
To specify the percentage overbooking rate, use the cable upstream admission-control interface configuration command. Use the no form of this command to disable upstream admission control.
cable upstream portnum admission-control percentage
no cable upstream portnum admission-controlSyntax Description
portnum
Specifies the upstream port.
percentage
Specifies the percentage overbooking rate to limit overbooking. Valid values are from 100 to 10000.
Default
Disabled
Command Mode
Interface Configuration
Command History
Example
The following example limits overbooking on upstream port 4 to 1000%:
Router(config-if)# cable upstream 4 admission-control 1000cable upstream channel-width
To specify an upstream channel width, use the cable upstream channel-width interface configuration command. Use the no form of this command to set the channel width to 1600000 for a port number.
cable upstream portnum channel-width width
no cable upstream portnum channel-widthSyntax Description
Default
1600000
Command Mode
Interface configuration
Command History
Example
The following example configures port 2 with a channel width of 200,000 Hz (which is equivalent to a symbol rate of 160 ksym/s):
Router(config-if)# cable upstream 2 channel-width 200000cable upstream data-backoff
To specify automatic or fixed start and stop values for data backoff, use the cable upstream data-backoff interface configuration command. Use the no form of this command to use the default data backoff values.
cable upstream portnum data-backoff {automatic | start end}
no cable upstream portnum data-backoffSyntax Description
Default
0 (start), 4 (end)
Command Mode
Interface configuration
Command History
Usage Guidelines
Cisco recommends that you use this automatic setting.
Example
The following example sets the automatic values for port 2:
Router(config-if)# cable upstream 2 data-backoff automaticcable upstream minislot-size
To specify a minislot size, use the cable upstream minislot-size interface configuration command. Use the no form of this command to set the default minislot size of 8 if this is valid for the current channel width setting.
cable upstream portnum minislot-size size
no cable upstream portnum minislot-sizeSyntax Description
Default
8
Command Mode
Interface configuration
Command History
Usage Guidelines
CautionUsing values of 64 or 128 for higher symbol rates such as 1280 Ksymb/sec or 2560 Ksymb/sec can cause performance problems. Depending on your current setting's symbol rate, you should select the minislot size (in ticks) that yields a minislot size of 32 or 64 symbols.
Example
The following example sets the minislot size on upstream port 4 to 16 (or 256 symbols):
Router(config-if)# cable upstream 4 minislot-size 16cable upstream modulation-profile
To assign a modulation profile to an interface, use the cable upstream modulation-profile interface configuration command. Use the no form of this command to assign modulation profile 1 to the interface.
cable upstream portnum modulation-profile profile
no cable upstream portnum modulation-profileSyntax Description
portnum
Specifies the port number.
profile
Assigns the modulation profile to the specified interface.
Default
Modulation profile 1
Command Mode
Interface configuration
Command History
Example
The following example assigns modulation profile 8 to port (interface) 2:
Router(config-if)# cable upstream 2 modulation-profile 8Related Commands
cable upstream range-backoff
To specify automatic or configured initial ranging backoff calculation, use the cable upstream range-backoff interface configuration command. Use the no form of this command to set default values.
cable upstream portnum range-backoff {automatic | start end}
no cable upstream portnum range-backoffSyntax Description
Default
0 (start), 4 (end)
Command Mode
Interface configuration
Command History
Example
The following example sets the range backoff to automatic for port 2:
Router(config-if)# cable upstream 2 range-backoff automaticcable upstream rate-limit
To set DOCSIS rate limiting for an upstream port on a cable modem card, use the cable upstream rate-limit interface configuration command. Use the no form of this command to disable DOCSIS rate limiting for an upstream port on a cable modem card.
cable upstream portnum rate-limit [token-bucket]
no cable upstream portnum rate-limitSyntax Description
portnum
Specifies the upstream port.
token-bucket
(Optional) Applies the token bucket filter algorithm.
Default
The rate limit of the cable upstream port.
Command Mode
Interface configuration
Command History
Usage Guidelines
Use of the default value (the upstream port's rate limit) enforces strict DOCSIS-compliant rate limiting.
Example
The following example uses the token bucket filter algorithm for upstream port 4:
Router(config-if)# cable upstream 4 rate-limit token-bucketRelated Commands
clear cable flap-list
To reset the flap-list table, use the clear cable flap-list privileged EXEC configuration command.
clear cable flap-list [mac-addr | all]
Syntax Description
mac-addr
(Optional) MAC address. Specify the 48-bit hardware address of an individual cable modem.
all
(Optional) Remove all modems from the flap-list table.
Default
No default behavior or values.
Command Mode
Privileged EXEC
Command History
Example
The following example removes all the modems from the flap-list table:
Router# clear cable flap-list allRelated Commands
clear cable modem counters
To reset a cable modem's flapping counters to zero, use the clear cable modem counters privileged EXEC configuration command.
clear cable modem {mac-addr | ip-addr | all} counters
Syntax Description
Default
No default behavior or values.
Command Mode
Privileged EXEC
Command History
Example
The following example clears the counters for the modem at IP address 172.00.00.00:
Router# clear cable modem 172.00.00.00 countersRelated Commands
Removes the specified modem from the Station Maintenance List and resets the modem.
clear cable modem reset
To remove a modem from the Station Maintenance List and reset the modem, use the clear cable modem reset privileged EXEC configuration command.
clear cable modem {mac-addr | ip-addr | all} reset
Syntax Description
Default
No default behavior or values.
Command Mode
Privileged EXEC
Command History
Usage Guidelines
This command causes the link to the modem to drop. The modem responds by resetting itself. It can take up to 30 seconds for the modem to start the reset sequence.
Example
The following example removes the cable modem at 172.00.00.00 from the Station Maintenance List:
Router# clear cable modem 172.00.00.00 resetRelated Commands
ping cable-modem
To determine whether a specific cable modem is on line, use the ping cable-modem privileged EXEC configuration command.
ping cable-modem mac-addr
Syntax Description
Default
No default behavior or values.
Command Mode
Privileged EXEC
Command History
Usage Guidelines
This ping is a MAC layer ping that uses extra keep-alive poll messages. It also uses smaller data units than a standard IP ping, which reduces the overhead. It will work even if the IP layer in the modem is down or not fully registered.
Example
The following example confirms that the cable modem at 172.00.00.00 is connected to the network and is operational:
Router# ping cable-modem 172.00.00.00172.00.00.00 is aliveshow cable flap-list
To display the cable flap-list, use the show cable flap-list privileged EXEC configuration command.
show cable flap-list [sort-flap | sort-time]
Syntax Description
sort-flap
(Optional) Sort by number of times the cable modem has flapped.
sort-time
(Optional) Sort most recent time the cable modem is detected to have flapped.
Default
No default behavior or values.
Command Mode
Privileged EXEC
Command History
Sample Display
The following displays show the return for flap-list tables sorted by MAC address, by time, and by a specific upstream interface:
router# show cable flap-list sort-flapMac Address Upstream Ins Hit Miss CRC P-Adj Flap Time.1eab.2c0b C6/0 U0 108 318 27 0 0 108 Sep 10 15:26:56.1eb2.bb07 C6/0 U0 0 293 31 1 1 1 Sep 10 15:15:49.7b6b.71cd C6/0 U0 1 288 32 0 0 1 Sep 10 15:12:13.1eb2.bb8f C6/0 U0 1 295 30 0 0 1 Sep 10 15:11:44router#Router# show cable flap-list sort-timeMac Address Upstream Ins Hit Miss CRC P-Adj Flap Time00e0.2222.2202 C4/0 U0 464 2069 242 0 421 885 Oct 16 22:47:230010.7b6b.57e1 C4/0 U0 0 2475 43 0 1041 1041 Oct 16 22:47:04router#router# show cable flap cable 3/0MAC Address Upstream Ins Hit Miss CRC P-Adj Flap Time0050.7366.1803 Cable3/0/U0 1787 3645 19861 0 !4 3578 Jan 17 03:28:350050.7366.17ab Cable3/0/U0 1785 3718 19817 0 !3 3573 Jan 17 03:28:290050.7366.1801 Cable3/0/U0 1785 3628 19781 0 !3 3573 Jan 17 03:28:250050.7366.17d3 Cable3/0/U0 1675 3934 19492 0 !35 3385 Jan 17 03:28:3700d0.bad3.c459 Cable3/0/U0 407 8293 3450 0 0 796 Jan 17 03:28:250090.8330.0214 Cable3/0/U0 174 659 2657 0 0 348 Jan 17 03:28:310090.8330.020f Cable3/0/U0 173 624 2662 0 0 347 Jan 17 03:27:080090.8330.0213 Cable3/0/U0 173 648 2655 0 0 346 Jan 17 03:26:420090.8330.0211 Cable3/0/U0 173 579 2653 0 0 346 Jan 17 03:27:08
show cable modem
To view configuration settings on the Cisco uBR7246, use the show cable EXEC command.
show cable modem [ip-address | mac-address]
Syntax Description
ip-address
(Optional) Specify the IP address of the modem.
mac-address
(Optional) Specify the MAC address of the modem.
Default
No default behavior or values.
Command Mode
Privileged EXEC
Command History
Usage Guidelines
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:
router# show cable modemInterface SID Online Timing Receive QoS IP address MAC addressState Offset PowerCable6/0/U0 1 online 3046 -2.00 4 10.30.128.35 0010.7b6b.7213Cable6/0/U0 2 online 3047 0.00 4 10.30.128.34 0010.7bb3.fbddCable6/0/U0 3 offline 3033 6.75 2 0.0.0.0 0020.4001.3e66describes the fields shown in the show cable modem display.
Related Commands
show cable modulation-profile
To display modulation profile group information, use the show cable modulation-profile privileged EXEC command.
show cable modulation-profile [profile] [iuc-code]
Syntax Description
Default
No default behavior or values.
Command Mode
Privileged EXEC
Command History
Usage Guidelines
This command displays modulation profile group information. A modulation profile is a collection of six burst profiles that are sent out in an upstream channel descriptors (UCD) message to configure a modem's transmit parameters for the following upstream message types: request, 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-profile 1Mo IUC Type Preamb Diff FEC FEC Scrambl Max Guard Last Scrambl Preamb length enco T CW seed B time CW offset bytes size size size short1 request qpsk 64 no 0x0 0x10 0x152 1 8 no yes 56 1 initial qpsk 128 no 0x5 0x22 0x152 0 48 no yes 0 1 station qpsk 128 no 0x5 0x22 0x152 0 48 no yes 0 1 short qpsk 72 no 0x5 0x4B 0x152 0 8 no yes 48describes the fields shown in the show cable modulation-profile display.
.
Related Commands
show cable qos permission
To display the status of permissions for changing QoS tables, use the show cable qos permission privileged EXEC configuration command.
cable qos permission
Syntax Description
This command has no keywords or arguments.
Command Mode
Privileged EXEC
Command History
Sample Displays
The following example displays the output of the show cable qos permission command:
Router# show cable qos permissionCreate by SNMP Update by SNMP Create by modemsyes yes yesdescribes the fields shown in the show cable qos permission displays.
Related Commands
Configures permissions for updating the QoS table.
Configures QoS profiles.
Displays QoS profiles.
show cable qos profile
To display QoS profiles, use the show cable qos profile privileged EXEC configuration command.
show cable qos profile service class
Syntax Description
Default
No default behavior or values.
Command Mode
Privileged EXEC
Command History
Sample Displays
The following example displays the QoS tables for profiles 1, 2, 3, and 4:
Router# show cable qos profileService Prio Max Guarantee Max Max tx TOS TOS Create Bclass upstream upstream downstream burst mask value by privbandwidth bandwidth bandwidth enab1 0 0 0 0 0 0x0 0x0 cmts no2 0 64000 0 1000000 0 0x0 0x0 cmts no3 0 1000 0 1000 0 0x0 0x0 cmts no4 7 2000000 100000 4000000 0 0x0 0x0 cm yesdescribes the fields shown in the show cable qos profile displays.
Related Commands
Configures permissions for updating the QoS table.
Displays QoS profiles.
Displays the status of permissions for changing QoS tables.
show cable spectrum-group
To display information about spectrum groups, use the show cable spectrum-group privileged EXEC configuration command.
show cable spectrum-group [groupnum]
Syntax Description
groupnum
(Optional) Displays information about the specified group number. If no group number is specified, information for all spectrum groups is displayed.
Default
All spectrum groups
Command Mode
Privileged EXEC
Command History
Sample Displays
The following are sample outputs from the show cable spectrum-group command for the upstream spectrum group named sales:
Router# show cable spectrum-group salesSpectrum Frequency Band Upstream Time Time Input SharedGroup (MHz) Port Available Delete PowerLevel Topology4 5.000-40.000 5 N4 5.000 5 N4 5.000-40.000 Mon 12:00:00 Mon 12:00:00 5 N4 5.000 Mon 12:00:00 5 Ndescribes the fields shown in the show cable spectrum-group displays.
Related Commands
show 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 [upstream] [port]
Syntax Description
slot/port
Slot number/port number indicating the location of the Cisco MC11 cable modem card.
upstream
(Optional) Displays upstream interface status.
port
(Optional) Selects specific upstream port.
Default
No default behavior or values.
Command Mode
Privileged EXEC
Command History
11.3 XA
This command was first introduced.
12.0(2)XC
This command was modified.
Sample Display
The following is sample output from the show controllers cable upstream command for the modem located in slot 4, port 0:
Router# show controllers cable 4/0 upstream 2Cable4/0 Upstream 2 is administratively downFrequency 5.008 MHz, Channel Width 0.200 MHz, QPSK Symbol Rate 0.160 MspsSpectrum Group 4Nominal Input Power Level 5 dBmV, Tx Timing Offset 0Ranging Backoff Start 16, Ranging Backoff End 16, Tx Backoff Start 16Tx Backoff End 16, Modulation Profile Group 1part_id=0x3137, rev_id=0x01, rev2_id=0xFFnb_agc_thr=0x0000, nb_agc_nom=0x0000Range Load Reg Size=0x58Request Load Reg Size=0x0EMinislot Size in number of Timebase Ticks is = 8Minislot Size in Symbols =8Bandwidth Requests = 0x0Piggyback Requests = 0x0Invalid BW Requests= 0x0Minislots Requested= 0x0Minislots Granted = 0x0Minislot Size in Bytes = 2UCD Count = 0DES Ctrl Reg#0 = C00C0C43, Reg#1 = 0
describes the fields shown in the show controllers cable upstream display.
Related Commands
Displays interface controllers information about the specified cable modem card slot.
show interface cable
To display cable interface information, use the show interface cable privileged EXEC command.
show interface cable slot/port [downstream | upstream]
Syntax Description
Default
No default behavior or values.
Command Mode
Privileged EXEC
Command History
Sample Display
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 interface 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 input, 0 corrected, 0 uncorrectable0 noise, 0 microreflectionsGuaranteed-rate service queue depth:0Best-effort service queue depth:0Total Modems On This Upstream Channel:3 (3 active)Current Total Bandwidth Reserved:192000 bpsCurrent Admission Control Status: ENFORCEDPercentage of Oversubscription: 200%Reservation Limit (with Oversubscription):5120000 bpsLast 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
Displays the service identifier information for each cable modem on the network.
Displays signal quality information for the specified slot.
show interface 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 Cisco uBR7200 chassis slot number and downstream port number. Valid values are from 3 to 6.
sid-number
(Optional) Identifies the service identification number.
Default
No default behavior or values.
Command Mode
Privileged EXEC
Command History
Usage Guidelines
Data transport over the RF link uses the registered SID address rather than the Ethernet address. This allows multiple hosts to access the network via a single cable modem.
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
show 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
slot/port
Identifies the Cisco uBR7200 chassis slot number and downstream port number. Valid values are from 3 to 6.
Default
No default behavior or values.
Command Mode
Privileged EXEC
Command History
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 12 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
test cable atp cable
To run the acceptance test procedure on a port, use the test cable atp cable privileged EXEC configuration command.
test cable atp cable slot/port MAC-address category test-id
Syntax Description
Default
No default behavior or values.
Command Mode
Privileged EXEC
Command History
Usage Guidelines
You should read and understand the ATP documentation before using this command.
The ATP tests are organized into categories such as PHY, MP, MAC, and so forth. Tests within each category are labeled MP01, MP02, ..., MAC01, MAC02, and so forth. If you run a test from the CLI, you can omit the leading zero in the test ID.
In this release, Cisco supports only a subset of all of the tests.
Examples
The following example tests the upstream cable interface located in slot 2/port 0 at MAC address 1.1.1. The test specified is MAC-PHY test 4 (MP-04).
Router# test cable atp cable 2/0 1.1.1 mp 4Running Upstream Channel Change (MP-04)Testing MP_04_UCD_FREQ_CHANGESetting the upstream to 30MHz through UCD.Waiting 30 seconds for new frequency to be effective.05:18:46: %UBR7200-5-USFREQCHG: Interface Cable2/0 Port U-1, frequency changed to 30.000 MHzConducting connectivity test.Some tests, such as the one shown below, produce volumious output:
Router#test cable atp c6/0 0010.7b43.aab9 8Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 19.1.25.195, timeout is 2 seconds:.!!!!Success rate is 80 percent (4/5), round-trip min/avg/max = 8/8/8 ms*** 1-1. Normal TLV order UCD test started.Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 19.1.25.195, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 8/26/100 ms*** 1-1. Normal TLV order UCD test passed.Continue to next step?[confirm]*** 1-2. Reversed TLV order UCD test started.Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 19.1.25.195, timeout is 2 seconds:!!!!!...!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 8/27/104 ms*** 2-6. negative burst descriptor(type 129, len 1; in Request msg) test passed.Continue to next step?[confirm]*** 2-7. undefined burst descriptor(type 12; in Short Data msg) test started.Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 19.1.25.195, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 8/26/100 ms*** 2-7. undefined burst descriptor(type 12; in Short Data msg) test passed.Continue to next step?[confirm]*** 2-8. Null burst descriptor(len 0, type 12; in Short Data msg) test started.Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 19.1.25.195, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 8/27/104 ms*** 2-8. Null burst descriptor(len 0, type 12; in Short Data msg) test passed.Continue to next step?[confirm]*** 2-9. negative burst descriptor(type 129, len 1; in Short Data msg) teststarted.Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 19.1.25.195, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 8/26/100 ms*** 2-9. negative burst descriptor(type 129, len 1; in Short Data msg) testpassed.Continue to next step?[confirm]*** 3-1. Number of burst profiles test(#burst desc.in UCD > # burst profiles inMAP) started.Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 19.1.25.195, timeout is 2 seconds:!!!!!...!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 8/26/100 ms*** 4-1. Long Grant without max. burst size test(Short Grant size=1) passed.Continue to next step?[confirm]*** 5-6. UCD count less than MAP change count test started.UCD count:19, next MAP change count:20Station maintenance req failedUCD count:19, next MAP change count restored:19*** 5-6. UCD count less than MAP change count test passed.Continue to next step?[confirm]*** 5-7. Stopping UCD test started.CM T1 timeout and reset (y/n)?[confirm]wait for CM to come up again.Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 19.1.25.195, timeout is 2 seconds:.!!!!Success rate is 80 percent (4/5), round-trip min/avg/max = 8/34/112 ms*** 5-7. Stopping UCD test passed.Continue to next step?[confirm]...Debug Commands
The following debug cable commands have been added to or modified in this release of the Cisco uBR7246 and are available to help you troubleshoot the cable interfaces:
For information on other debug cable commands, refer to the Voice, Video, and Home Applications Configuration Guide.
debug cable mac
Use the debug cable mac EXEC command to display MAC-layer information for the specified cable modem. The no form of this command disables debugging output.
debug cable mac
no debug cable macSyntax Description
This command has no keywords or arguments.
Default
No default behavior or values.
Command Mode
Privileged EXEC
Command History
Usage Guidelines
Note
Example
The following example shows the return for the MAC layer:
router# debug cable mac19:46:27: Ranging Modem with Sid 1 on i/f : Cable6/0/U019:46:27: Got a ranging request19:46:27: SID value is 1 on Interface Cable6/0/U019:46:27: CM mac address 00:E0:1E:B2:BB:0719:46:27: Timing offset is 019:46:27: Power value is FE0, or 0 dB19:46:27: Freq Error = 0, Freq offset is 019:46:27: Ranging has been successful for SID 1 on Interface Cable6/0/U019:46:29: Ranging Modem with Sid 2 on i/f : Cable6/0/U019:46:29: Got a ranging request19:46:29: SID value is 2 on Interface Cable6/0/U019:46:29: CM mac address 00:E0:1E:B2:BB:8F19:46:29: Timing offset is 119:46:29: Power value is 1350, or 0 dB19:46:29: Freq Error = 0, Freq offset is 019:46:29: Ranging has been successful for SID 2 on Interface Cable6/0/U019:46:32: Ranging Modem with Sid 3 on i/f : Cable6/0/U019:46:32: Got a ranging request19:46:32: SID value is 3 on Interface Cable6/0/U019:46:32: CM mac address 00:E0:1E:B2:BB:B119:46:32: Timing offset is FFFFFFFF19:46:32: Power value is 1890, or -1 dB19:46:32: Freq Error = 0, Freq offset is 019:46:32: Ranging has been successful for SID 3 on Interface Cable6/0/U019:46:34: Ranging Modem with Sid 5 on i/f : Cable6/0/U0
Related Commands
debug cable map
Use the debug cable map EXEC command to display map debugging messages. The no form of this command disables debugging output.
debug cable map
no debug cable mapSyntax Description
This command has no keywords or arguments.
Default
No default behavior or values.
Command Mode
Privileged EXEC
Command History
Example
The following example displays all the MAP messages with and without data grants:
router# debug cable map19:41:53: On interface Cable6/0, sent 5000 MAPs, 1321 MAPs had grant(s)Long Grants 13256993, Total Short Grants 223A sample Map without any data grant------------------ MAP MSG --------------------us_ch_id: 1 ucd_count: 5 num_elems: 9 reserved: 0Alloc Start Time: 33792 Ack Time: 33618Rng_bkoff_start: 0 Rng_bkoff_end: 2Data_bkoff_start: 1 Data_bkoff_end: 3:sid:16383 iuc:1 mslot_offset:0sid:0 iuc:7 mslot_offset:40A sample Map with data grant(s)------------------ MAP MSG ---------------------us_ch_id: 1 ucd_count: 5 num_elems: 7 reserved: 0Alloc Start Time: 33712 Ack Time: 33578Rng_bkoff_start: 0 Rng_bkoff_end: 2Data_bkoff_start: 1 Data_bkoff_end: 3sid:2 iuc:6 mslot_offset:0sid:16383 iuc:1 mslot_offset:16sid:0 iuc:7 mslot_offset:40
Related Commands
What to Do Next
For more information on the Cisco uBR7246, refer to the Voice, Video, and Home Applications Configuration Guide.
For instructions on the advanced configuration of the port adapters installed in your Cisco uBR7246, refer to the respective installation documents that shipped with each port adapter. This documentation is also available on the Cisco Documentation CD-ROM and on Cisco Connection Online (CCO).
For instructions on the advanced configuration of the cable modem cards, refer to the document Cisco uBR7246 Universal Broadband Router Cable Modem Card Installation and Configuration This document accompanies every Cisco cable modem card that is shipped from the factory as an installed item in a Cisco uBR7246 or as a field replaceable unit (FRU). The document is also available on the Cisco Documentation CD-ROM and on CCO.
Guest
