Page 2 - Feature Summary; List of Terms; and to the upstream data slots.
Feature Summary 2 Release 11.3(4)NA List of Terms CATV —Originally stood for Community Antenna Television. CATV now refers to any cable (coaxial/fiber) based system that provides television services. Cable modem —Any device that modulates and demodulates digital data onto a CATV plant. Cable router ...
Page 3 - Troubleshooting Tips for the Cisco uBR904 Cable Modem; Prerequisites; show; EXEC command to display the software version level.; Supported MIBs and RFCs; The Cisco uBR904 cable modem supports the following:; Cisco Product Documentation: Network Management: CiscoWorks
List of Terms Troubleshooting Tips for the Cisco uBR904 Cable Modem 3 Prerequisites Cisco IOS Release 11.3(4)NA or later must be running inside the cable modem. Enter the show version EXEC command to display the software version level. Supported MIBs and RFCs The Cisco uBR904 cable modem supports th...
Page 4 - CMTS to Cable Modem Network Topology; Figure 1
CMTS to Cable Modem Network Topology 4 Release 11.3(4)NA CMTS to Cable Modem Network Topology Figure 1 shows the physical relationship between the devices in the HFC network and the cable modem. Figure 1 Sample Topology IP-related ATM, FDDI, 100BT... 100BT Analog TV Digital TV Upconvertor ISP @ home...
Page 5 - Troubleshooting Tips; Understand How Basic Initialization Works
Understand How Basic Initialization Works Troubleshooting Tips for the Cisco uBR904 Cable Modem 5 Troubleshooting Tips Perform the following steps to troubleshoot a cable modem: • Step 1—Understand How Basic Initialization Works • Step 2—Connect to the Cable Modem • Step 3—Display the Cable Modem’s ...
Page 7 - Connect to the Cable Modem
Connect to the Cable Modem Troubleshooting Tips for the Cisco uBR904 Cable Modem 7 . Connect to the Cable Modem Telnet to the IP address assigned to the cable interface or Ethernet interface. If the interface is not up, you need to access the Cisco IOS software via the RJ-45 console port, which is a...
Page 8 - Display the Cable Modem’s MAC Log File
Troubleshooting Tips 8 Release 11.3(4)NA 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 th...
Page 10 - show controller; show controller cable-modem; Interpret the MAC Log File and Take Action; Event 1—Wait for the Link to Come Up
Troubleshooting Tips 10 Release 11.3(4)NA You can display other aspects of the MAC layer by using variations of the show controller cable-modem 0 mac command: uBR904# show controller cable-modem 0 mac ? errors Mac Error Log data hardware All CM Mac Hardware registers log Mac log data resets Resets o...
Page 11 - Event 2
Interpret the MAC Log File and Take Action Troubleshooting Tips for the Cisco uBR904 Cable Modem 11 Event 2 — Scan for a Downstream Channel then Synchronize Different geographical regions and different cable plants use different frequency bands. The Cisco uBR904 cable modem uses a built-in default f...
Page 12 - Event 3—Obtain Upstream Parameters; The field
Troubleshooting Tips 12 Release 11.3(4)NA Event 3—Obtain Upstream Parameters The cable modem waits for an upstream channel descriptor messages (UCD) from the headend Cisco uBR7246. This is done to retrieve transmission parameters for the upstream channel. 508146.124 CMAC_LOG_STATE_CHANGE wait_ucd_st...
Page 13 - Event 5—Establish IP Connectivity
Interpret the MAC Log File and Take Action Troubleshooting Tips for the Cisco uBR904 Cable Modem 13 Event 5—Establish IP Connectivity After ranging is complete, the cable interface on the cable modem is up. Now the cable modem accesses a remote DHCP server to get an IP address. The DHCP request also...
Page 14 - Event 8; shows the filename containing the; Event 9
Troubleshooting Tips 14 Release 11.3(4)NA Event 8 — Transfer Operational Parameters After the DHCP and security operations are successful, the cable modem downloads operational parameters from a cable company’s TFTP server. These parameters are transferred via a configuration file. The field CMAC_LO...
Page 15 - Enter the Maintenance State; Use Additional Troubleshooting Commands; Command; verbose
Use Additional Troubleshooting Commands Troubleshooting Tips for the Cisco uBR904 Cable Modem 15 Event 11 — Enter the Maintenance State As soon as the cable modem is completely up and running, it enters the operational maintenance state. 508178.322 CMAC_LOG_STATE_CHANGE maintenance_state Use Additio...
Page 16 - Command Reference
Command Reference 16 Release 11.3(4)NA Command Reference This section provides new commands for troubleshooting the Cisco uBR904 cable modem. All other commands used with this feature are documented in the Cisco IOS Release 11.3 command references. • show controller cable-modem • show controller cab...
Page 17 - Privileged EXEC command.; Syntax Description; Privileged EXEC; Usage Guidelines; This command first appeared in Cisco IOS Release 11.3 NA.; Sample Display; Following is a sample output for this command:; number
show controller cable-modem Troubleshooting Tips for the Cisco uBR904 Cable Modem 17 show controller cable-modem To display high-level controller information about a cable modem, use the show controller cable-modem Privileged EXEC command. Syntax Description Command Mode Privileged EXEC Usage Guidel...
Page 18 - Related Commands
Command Reference 18 Release 11.3(4)NA Global control and status: global_ctrl_status=0x00 interrupts: irq_pend=0x0008, irq_mask=0x00F7 Related Commands show controller cable-modem bpkmshow controller cable-modem desshow controller cable-modem filtersshow controller cable-modem lookup-tableshow contr...
Page 19 - show controller cable-modem bpkm; show controller cable-modem bpkm; bpkm
show controller cable-modem bpkm Troubleshooting Tips for the Cisco uBR904 Cable Modem 19 show controller cable-modem bpkm To display information about the baseline privacy key management exchange between the cable modem and the headend CMTS, use the show controller cable-modem bpkm Privileged EXEC ...
Page 20 - show controller cable-modem des; This command has no key words or arguments.; Command Mode; DES engine registers are displayed in the following example:
Command Reference 20 Release 11.3(4)NA show controller cable-modem des To display information about the Data Encryption Standard (DES) engine registers, use the show controller cable-modem des Privileged EXEC command. show controller cable-modem des Syntax Description This command has no key words o...
Page 22 - show controller cable-modem filters; There are no key words or arguments for this command.
Command Reference 22 Release 11.3(4)NA show controller cable-modem filters To display the registers in the MAC hardware that are used for filtering received frames, use the show controller cable-modem filters Privileged EXEC command. show controller cable-modem filters Syntax Description There are n...
Page 26 - show controller cable-modem mac
Command Reference 26 Release 11.3(4)NA show controller cable-modem mac To show detailed MAC layer information for a cable modem, enter the show cable controller cable-modem number mac Privileged EXEC command. show controller cable-modem number mac [ errors | hardware | log | resets | state ] Syntax ...
Page 27 - Sample Display 1
show controller cable-modem mac Troubleshooting Tips for the Cisco uBR904 Cable Modem 27 Sample Display 1 The following sample display shows the MAC log file for a cable-modem interface that has successfully come up: uBR904# show controller cable-modem 0 mac log *Mar 7 01:42:59: 528302.040 CMAC_LOG_...
Page 28 - Sample Display 2
Command Reference 28 Release 11.3(4)NA *Mar 7 01:43:15: 528317.958 CMAC_LOG_RNG_RSP_MSG_RCVD *Mar 7 01:43:15: 528317.960 CMAC_LOG_ADJUST_TX_POWER 14 *Mar 7 01:43:15: 528317.962 CMAC_LOG_POWER_LEVEL_IS 34.0 dBmV (commanded) *Mar 7 01:43:15: 528317.964 CMAC_LOG_RANGING_CONTINUE *Mar 7 01:43:16: 528318...
Page 29 - Sample Displays 3; The; command shows only the entries in the cable MAC; Table 2; The DHCP server took too long to respond.
show controller cable-modem mac Troubleshooting Tips for the Cisco uBR904 Cable Modem 29 Sample Displays 3 The show controller cable-modem 0 mac resets command shows only the entries in the cable MAC log that begin with the field CMAC_LOG_RESET . Collectively presenting these fields provides you wit...
Page 30 - The TFTP server took too long to respond.
Command Reference 30 Release 11.3(4)NA CMAC_LOG_RESET_PRIVACY_WATCHDOG_EXPIRED The baseline privacy exchange with the CMTS took too long. CMAC_LOG_RESET_CHANGE_US_WATCHDOG_EXPIRED The cable modem was unable to transmit a response to a UCC-REQ message. CMAC_LOG_RESET_SECURITY_WATCHDOG_EXPIRED The “fu...
Page 31 - Sample Display 4; This example display for the; command shows the
show controller cable-modem mac Troubleshooting Tips for the Cisco uBR904 Cable Modem 31 Sample Display 4 This example display for the show controller cable-modem 0 mac hardware command shows the detailed configuration of the interface driver and MAC layer hardware. The most interesting bit is the s...
Page 33 - Sample Display 5; command summarizes the state of the cable MAC
show controller cable-modem mac Troubleshooting Tips for the Cisco uBR904 Cable Modem 33 timing recovery circuit: loop_enable=0x00, minislot_divisor=0x00 K0_ctrl=0x06, K1_ctrl=0x07, acq_threshhold=0x01 err_threshhold=0x04, timeout_threshold=0xFF nco_bias=0x4F7004F7, ranging_offset=0x00000000 ts_err=...
Page 36 - show controller cable-modem phy; show controller cable-modem phy; receive; transmit
Command Reference 36 Release 11.3(4)NA show controller cable-modem phy To display detailed contents about the registers used in the downstream physical hardware used by a cable modem, use the show controller cable-modem phy Privileged EXEC command. show controller cable-modem phy { receive | transmi...
Page 38 - show controller cable-modem tuner; Table 3; Field; Indicates the current downstream frequency.; Current upstream frequency.; EXEC command to see the power level in dBmV.
Command Reference 38 Release 11.3(4)NA show controller cable-modem tuner To display the settings for the upstream and downstream tuners used by a cable modem, use the show controller cable-modem tuner Privileged EXEC command. show controller cable-modem tuner Syntax Description There are no key word...
Page 40 - show interface cable-modem; EXEC
Command Reference 40 Release 11.3(4)NA show interface cable-modem To display information about the cable modem interface on a cable modem, use the show interface cable-modem EXEC command. show interface cable-modem number [ accounting | counters | crb | irb | type ] Syntax Description Command Mode E...
Page 42 - Debug Commands
Debug Commands 42 Release 11.3(4)NA Debug Commands The following new debug commands are available to troubleshoot a cable modem: • debug cable-modem bpkm • debug cable-modem bridge • debug cable-modem error • debug cable-modem interrupts • debug cable-modem mac • debug cable-modem map
Page 43 - debug cable-modem bpkm; Figure 3; Figure 4
debug cable-modem bpkm Troubleshooting Tips for the Cisco uBR904 Cable Modem 43 debug cable-modem bpkm To debug baseline privacy information on a cable modem, use the debug cable-modem mac Privileged EXEC command. The no form of this command turns debugging messages off. [ no ] debug cable-modem bpk...
Page 45 - debug cable-modem bridge; debug cable-modem bridge; debug cable-modem bridge; Figure 5
debug cable-modem bridge Troubleshooting Tips for the Cisco uBR904 Cable Modem 45 debug cable-modem bridge Use the debug cable-modem bridge Privileged EXEC command to debug bridge filter processing information on a cable modem. The no form of this command turns debugging messages off. [ no ] debug c...
Page 46 - debug cable-modem error; debug cable-modem error; Figure 6
Debug Commands 46 Release 11.3(4)NA debug cable-modem error Use the the debug cable-modem error Privileged EXEC command to enable debugging messages for the cable interface driver. The no form of this command turns debugging messages off. [ no ] debug cable-modem error Usage Guidelines This command ...
Page 47 - debug cable-modem interrupts; debug cable-modem interrupts; Figure 7
debug cable-modem interrupts Troubleshooting Tips for the Cisco uBR904 Cable Modem 47 debug cable-modem interrupts Use the debug cable-modem interrupts command to debug cable modem interrupts. The no form of this command turns debugging messages off. [ no ] debug cable-modem interrupts Usage Guideli...
Page 48 - debug cable-modem mac; Sample Displays
Debug Commands 48 Release 11.3(4)NA 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 Usage Gu...
Page 49 - Figure 8
debug cable-modem mac Troubleshooting Tips for the Cisco uBR904 Cable Modem 49 Figure 8 Sample Debug Cable-Modem Mac Log Output uBR904# debug cable-modem mac log *Mar 7 01:42:59: 528302.040 CMAC_LOG_LINK_DOWN *Mar 7 01:42:59: 528302.042 CMAC_LOG_RESET_FROM_DRIVER *Mar 7 01:42:59: 528302.044 CMAC_LOG...
Page 50 - Figure 9; Sample Debug Cable-Modem Mac Messages Output
Debug Commands 50 Release 11.3(4)NA Figure 9 compares the output of the debug cable-modem mac log command with the debug cable-modem mac log verbose command. The keyword verbose displays periodic events such as ranging. Figure 9 Sample Debug Cable-Modem Mac Log and Verbose Output uBR904# debug cable...
Page 53 - debug cable-modem map; debug cable-modem map; debug cable map; Sample Debug Cable-Modem Map Output
debug cable-modem map Troubleshooting Tips for the Cisco uBR904 Cable Modem 53 debug cable-modem map Use the debug cable-modem map Privileged EXEC command to display the timing from MAP messages to sync messages and the timing between MAP messages. The no form of this command disables debugging outp...
Page 54 - What to do Next; Cisco Cable
What to do Next 54 Release 11.3(4)NA What to do Next For more troubleshooting tips, see the chapter “Troubleshooting the Installation” in the Cisco Cable Modem Installation and Configuration Guide .
