Command Reference

show controller cable-modem mac

To show detailed MAC layer information for a cable modem, enter the show cable controller cable-modemnumber mac Privileged EXEC command.

show controller cable-modem number mac [errors hardware log resets state]

Syntax Description

number

The controller number inside the cable modem.

errors

(Optional) Displays a log of the error events that are reported to

 

SNMP. This keyword gives you a way of looking at the error

 

events without using a MIB.

hardware

(Optional) Displays all MAC hardware registers.

log

(Optional) Displays a history of MAC log messages, up to 1023

 

entries. This is the same output that is displayed when the

 

debug cable mac log command is entered.

resets

(Optional) Extracts all the reset causes out of the MAC log file

 

and summarizes them into a mini report.

state

(Optional) Displays a summary of the MAC state.

Command Mode

Privileged EXEC

Usage Guidelines

This command first appeared in Cisco IOS Release 11.3 NA.

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 show controller cable-modemnumber mac log command to view MAC log messages.

If the cable modem interface fails to come up or resets periodically, the MAC log will capture 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 most useful keywords for troubleshooting a cable modem are log, errors, and resets. See Sample Display 1, Sample Display 2, and Sample Displays 3.

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Cisco Systems UBR904 manual Show controller cable-modem mac, Errors

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.