RNG-REQ/RNG-RSP
verbose keyword.
Sample Displays
Figure 8 shows sample display output from the debug cable-modem mac log Privileged EXEC command. After the debug command is entered, the fields of the output are: the date, local time, seconds since bootup, the log message, and in some cases a parameter that gives more detail about the log entry.
The line “0 events dropped due to lack of a chunk” at the end of a display indicates that no log entries were discarded due to a temporary lack of memory. This means the log is accurate and reliable.
CMAC_LOG_WATCHDOG_TIMER
After initial ranging is successful (dhcp_state has been reached), further
messages and watchdog timer entries are suppressed from output, unless the verbose keyword suffix is used. For example, the debug cable-modem mac log verbose command is entered. Note that
entries while in the maintenance_state are normal when using the
Mac log messages are written to a circular log file even when debugging is not turned on. These messages include timestamps, events, and information pertinent to these events. Enter the debug cable-modem mac log command to view Mac log messages. If you want to view this information without entering debug mode, enter the show controller cable-modemnumber mac log command. The same information is displayed by both commands.
If the cable modem interface fails to come up or resets periodically, the Mac log will show what happened. For example, if an address is not obtained from the DHCP server, an error is logged, initialization starts over, and the cable modem scans for a downstream frequency. The debug cable-modem mac log command displays the log from oldest entry to newest entry.

Debug Commands

debug cable-modem mac

Use the debug cable-modem mac Privileged EXEC command to troubleshoot the cable modem MAC layer. The no form of this command turns debugging messages off.

[no] debug cable-modem mac {log [verbose] messages}

Syntax Description

log

Realtime MAC log display.

verbose

(Optional) Displays periodic MAC layer events, such as ranging.

messages

MAC layer management messages.

Usage Guidelines

This command first appeared in Cisco IOS Release 11.3 NA.

Of all the available debug cable modem commands, the most useful is debug cable-modem mac log.

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Cisco Systems UBR904 manual Debug cable-modem mac, Syntax Description

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.