Cisco Systems UBR924 manual Troubleshooting Steps, Understand How Basic Initialization Works

Step 1—Understand How Basic Initialization Works

Troubleshooting Steps

To troubleshoot a malfunctioning cable modem, perform the following tasks:

•Step 1—Understand How Basic Initialization Works

•Step 2—Connect to the Cisco uBR924

•Step 3—Display the Cisco uBR924’s MAC Log File

•Step 4—Interpret the MAC Log File and Take Action

•(Optional) Step 5—Use Additional Troubleshooting Commands

Step 1—Understand How Basic Initialization Works

Before you troubleshoot a Cisco uBR924 cable access router, you should be familiar with the cable modem initialization process. See Figure 2 and Table 1. Understanding this flowchart and sequence of events will help you determine where and why connections fail.

The sequence numbers shown in Figure 2 are explained in Table 1, which appears after the illustration. The Cisco uBR924 will complete all the steps in this flowchart each time it needs to reestablish ranging and registration with the CMTS.

8Cisco IOS Release 12.0(5)T