Cisco Systems UBR904 manual Display the Cable Modem’s MAC Log File

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wait_for_link_up_state

Troubleshooting Tips

Display the Cable Modem’s MAC Log File

A MAC layer circular log file is inside the cable modem. This file contains a history of log messages, such as state event activities and timestamps, which are used for troubleshooting purposes. This log file contains the most valuable information for a cable technician or engineer to debug the cable interface.

The MAC log file is displayed by entering the show controller cable-modem 0 mac log EXEC command.

The most useful display fields in this log file are the reported state changes. These fields are preceded by the message CMAC_LOG_STATE_CHANGE. These fields show how the cable modem progresses through the various processes involved in establishing communication with the CMTS and registration. The maintenance_state is the normal operational state, and the

is the normal state when the interface is shutdown.

Here is the normal progression of states as displayed by the MAC log:

wait_for_link_up_state

ds_channel_scanning_state wait_ucd_state wait_map_state ranging_1_state ranging_2_state dhcp_state establish_tod_state security_association_state configuration_file_state registration_state establish_privacy_state maintenance_state

Note To translate this output into more meaningful information, see the “Interpret the MAC Log File and Take Action” section on page 10.

Here is what an example MAC log file looks like when the cable modem interface successfully comes up and registers with the cable network. The output you see is directly related to the messages that are exchanged between the cable modem and the CMTS (the Cisco uBR7246).

uBR904# show controller cable-modem 0 mac log

 

508144.340

CMAC_LOG_DRIVER_INIT_IDB_RESET

0x08098FEA

508144.342

CMAC_LOG_LINK_DOWN

 

508144.344

CMAC_LOG_LINK_UP

 

508144.348

CMAC_LOG_STATE_CHANGE

ds_channel_scanning_state

508144.350

CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND

88/453000000/855000000/6000000

508144.354

CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND

89/93000000/105000000/6000000

508144.356

CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND

90/111250000/117250000/6000000

508144.360

CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND

91/231012500/327012500/6000000

508144.362

CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND

92/333015000/333015000/6000000

508144.366

CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND

93/339012500/399012500/6000000

508144.370

CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND

94/405000000/447000000/6000000

508144.372

CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND

95/123015000/129015000/6000000

508144.376

CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND

96/135012500/135012500/6000000

508144.380

CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND

97/141000000/171000000/6000000

508144.382

CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND

98/219000000/225000000/6000000

508144.386

CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND

99/177000000/213000000/6000000

508144.390

CMAC_LOG_WILL_SEARCH_SAVED_DS_FREQUENCY

699000000

508145.540

CMAC_LOG_UCD_MSG_RCVD

3

508146.120

CMAC_LOG_DS_64QAM_LOCK_ACQUIRED

699000000

8Release 11.3(4)NA

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Contents Feature Summary BenefitsFeature Summary List of TermsList of Terms PrerequisitesSupported MIBs and RFCs Cmts to Cable Modem Network Topology Cmts to Cable Modem Network TopologyUnderstand How Basic Initialization Works Troubleshooting TipsUnderstand How Basic Initialization Works Troubleshooting Tips Cable Modem Initialization FlowchartConnect to the Cable Modem Display the Cable Modem’s MAC Log File UBR904# show controller cable-modem 0 mac logDisplay the Cable Modem’s MAC Log File Cmaclogresetfromdriver Interpret the MAC Log File and Take ActionEvent 1-Wait for the Link to Come Up UBR904# show controller cable-modem 0 mac ?Interpret the MAC Log File and Take Action Event 4-Start Ranging for Power Adjustments Event 3-Obtain Upstream ParametersEvent 7-Establish Security Event 5-Establish IP ConnectivityEvent 6-Establish the Time of Day Event 10-Comply with Baseline Privacy Event 8-Transfer Operational ParametersEvent 9-Perform Registration Use Additional Troubleshooting Commands Event 11-Enter the Maintenance StateUse Additional Troubleshooting Commands Command PurposeCommand Reference Command ReferenceCommand Mode Show controller cable-modemSyntax Description Usage GuidelinesRelated Commands UBR904# show controller cable-modem 0 bpkm Show controller cable-modem bpkmShow controller cable-modem bpkm Show controller cable-modem des UBR904# show controller cable-modem 0 des downstream desShow controller cable-modem des Show controller cable-modem filters DsmacdafiltersShow controller cable-modem filters Show controller cable-modem lookup-table Lookup table is displayed in the following exampleShow controller cable-modem lookup-table Errors Show controller cable-modem mac014308 528311.396 Cmacloginitialrangingminislots 014313 528315.936 CmaclogadjustrangingoffsetShow controller cable-modem mac 014259 528302.046 CmaclogdriverinitidbshutdownCmaclogwatchdogtimer CmaclogresetdhcpwatchdogexpiredUBR904# show controller cable-modem 0 mac errors CmaclogdhcpprocesskilledPossible but Uncommon Cable Interface Reset Causes UBR904# show controller cable-modem 0 mac resetsSample Displays Message DescriptionCmaclogresetprivacywatchdogexpired CmaclogresetchangeuswatchdogexpiredCmaclogresetsecuritywatchdogexpired CmaclogresetallfrequenciessearchedCmaclogresetdstunerwatchdog CmaclogresetunabletosetmibobjectInterrupts Irqpend=0x0018, irqmask=0x00E7 UBR904# show controller cable-modem 0 mac state TrueDS ID 64QAMUS ID Burst Descriptor Interval Usage CodeRanging Backoff Start D12=FFD3FFE0 Show controller cable-modem phyD11=FFD3FFAD Show controller cable-modem phy CC CC CC CC CC 0D 0D CC CC CC CC CC CC CC CC 0DShow controller cable-modem tuner Show controller cable-modem tuner Show interface cable-modem AccountingShow interface cable-modem UBR904# show int cable-modem 0 accountingARP UBR904# show int cable-modem 0 countersDebug Commands Debug CommandsDebug cable-modem bpkm Debug cable-modem bpkmBpkm UBR904# debug cable bpkmRelated Commands UBR904# debug cable-modem bridge Debug cable-modem bridgeDebug cable-modem bridge Debug cable-modem error Debug cable-modem errorSample Debug Cable-Modem Error Output UBR904# debug cable-modem interrupts Debug cable-modem interruptsDebug cable-modem interrupts Debug cable-modem mac UBR904# debug cable-modem mac log Debug cable-modem macSample Debug Cable-Modem Mac Log Output Debug cable mac messages UBR904# debug cable mac logUBR904# debug cable mac log verbose Rsvd CC 0DEhdr MAC Management Message HeaderDebug cable-modem map Debug cable-modem mapDebug cable-modem map What to do Next What to do Next
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UBR904 specifications

The Cisco UBR904 is a versatile broadband access device designed to deliver high-speed internet and data services in various deployment scenarios, particularly suitable for cable operators and service providers. This device allows operators to provide broadband services over a wide area, utilizing advanced technologies to ensure reliability and performance.

One of the key features of the UBR904 is its capability to support multiple channels for upstream and downstream communication, allowing for greater bandwidth and improved network performance. With its integrated DOCSIS (Data Over Cable Service Interface Specification) compliance, the UBR904 enables operators to leverage existing coaxial cable infrastructures to deliver data services efficiently. This makes it an ideal choice for operators looking to expand their service offerings without the need for extensive infrastructure changes.

Equipped with a powerful processor and ample memory, the UBR904 is designed for high throughput and low latency, supporting IP data services, voice services, and video on demand. It utilizes advanced modulation techniques and error correction algorithms that enhance data transmission efficiency and reliability. This results in a robust platform capable of meeting the demands of high-density areas while accommodating future growth.

The UBR904 also features flexible management capabilities. It includes support for SNMP (Simple Network Management Protocol), enabling operators to monitor and manage network performance effectively. The device can be easily configured through a graphical user interface or command-line interface, providing system administrators with the tools needed for straightforward deployment and maintenance.

In addition to its core functionalities, the UBR904 integrates security features to protect network traffic and ensure user data integrity. This includes capabilities for secure tunneling and access control lists, which enhance the security of the broadband connection.

Furthermore, the Cisco UBR904 is designed with scalability in mind. Operators can easily scale their networks by adding additional modules or interfaces as demand grows. This ensures that the UBR904 can meet the evolving needs of service providers without necessitating a complete hardware overhaul.

In summary, the Cisco UBR904 is a robust, feature-rich broadband access device that combines high performance, advanced technologies, and scalability, making it an excellent choice for operators looking to deliver high-speed internet and data services across diverse environments. Its ease of use and extensive management features further enhance its appeal, positioning it as a key player in the broadband access market.