Troubleshooting Guide
Page 1
Note For an explanation of Cisco IOS troubleshooting commands that occurred between a Cisco uBR904 cable modem and other peripheral devices installed in the HFC network such as the headend Cisco uBR7246 router, a DHCP server, and a TFTP server. Benefits The uBR904 troubleshooting system provides the following sections are provided: • Feature Summary on page 1 • Platforms on page 3 • Supported...
Note For an explanation of Cisco IOS troubleshooting commands that occurred between a Cisco uBR904 cable modem and other peripheral devices installed in the HFC network such as the headend Cisco uBR7246 router, a DHCP server, and a TFTP server. Benefits The uBR904 troubleshooting system provides the following sections are provided: • Feature Summary on page 1 • Platforms on page 3 • Supported...
Troubleshooting Guide
Page 2
... frequencies used for data-over -cable communication events is expected to create a link between the HFC system and any coaxial or fiber cable-based system that connects to the subscriber. Cable router-A modular chassis-based router optimized for television in the downstream... A method of homes in the neighborhood to the upstream data slots. The coaxial cable part of the cable modem. Cable modem (CM)-Any device that addresses can remotely telnet into a Cisco uBR904 cable modem, which could be installed in a customer's home, and perform simple diagnostic tasks....
... frequencies used for data-over -cable communication events is expected to create a link between the HFC system and any coaxial or fiber cable-based system that connects to the subscriber. Cable router-A modular chassis-based router optimized for television in the downstream... A method of homes in the neighborhood to the upstream data slots. The coaxial cable part of the cable modem. Cable modem (CM)-Any device that addresses can remotely telnet into a Cisco uBR904 cable modem, which could be installed in a customer's home, and perform simple diagnostic tasks....
Troubleshooting Guide
Page 3
... Cisco uBR904 Cable Modem" for information regarding supported MIBs and RFCs. See cable modem. QPSK-Quadrature Phase-Shift Keying. Subscriber Unit (SU)-An alternate term for the Cisco uBR904 Cable Modem 3 Supported MIBs and RFCs See the companion to the headend. Upstream-The set of . SID (Service ID)-A number that the transmissions of a cable modem are aligned with the Cisco uBR7246 universal broadband router...
... Cisco uBR904 Cable Modem" for information regarding supported MIBs and RFCs. See cable modem. QPSK-Quadrature Phase-Shift Keying. Subscriber Unit (SU)-An alternate term for the Cisco uBR904 Cable Modem 3 Supported MIBs and RFCs See the companion to the headend. Upstream-The set of . SID (Service ID)-A number that the transmissions of a cable modem are aligned with the Cisco uBR7246 universal broadband router...
Troubleshooting Guide
Page 4
..., FDDI, 100BT... 100BT Proxy server Cisco uBR7246 CMTS Analog TV 100BT 100BT ISP @ home... 100BT MSD: Maintenance Service Organization, Cable companies Upconvertor DS-RF 54-860 Mhz Digital TV Fiber Transceiver Fiber node (Telephone pole, underground box) 80 km 1000 ft Distribution Top amplifier amplifier Drop box 13304 Cisco u BR904 cable modem 4 Cisco IOS Release 12.0(3)T
..., FDDI, 100BT... 100BT Proxy server Cisco uBR7246 CMTS Analog TV 100BT 100BT ISP @ home... 100BT MSD: Maintenance Service Organization, Cable companies Upconvertor DS-RF 54-860 Mhz Digital TV Fiber Transceiver Fiber node (Telephone pole, underground box) 80 km 1000 ft Distribution Top amplifier amplifier Drop box 13304 Cisco u BR904 cable modem 4 Cisco IOS Release 12.0(3)T
Troubleshooting Guide
Page 5
... will complete all the steps in Table 1, which appears after the illustration. The cable modem will help you should be familiar with the CMTS. Troubleshooting Tips for the Cisco uBR904 Cable Modem 5 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...
... will complete all the steps in Table 1, which appears after the illustration. The cable modem will help you should be familiar with the CMTS. Troubleshooting Tips for the Cisco uBR904 Cable Modem 5 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...
Troubleshooting Guide
Page 6
... 2 Cable Modem Initialization Flowchart Power on Scan for 1 downstream channel Downstream sync established Obtain 2 upstream parameters Upstream parameter acquired 3 Start Ranging Ranging and auto adjust completed Establish 4 IP connectivety IP complete Establish 5 time of day Time of day established Establish security 6 Security established Transfer operational 7 parameters Transfer complete Register with the Cisco 8 uBR7246...
... 2 Cable Modem Initialization Flowchart Power on Scan for 1 downstream channel Downstream sync established Obtain 2 upstream parameters Upstream parameter acquired 3 Start Ranging Ranging and auto adjust completed Establish 4 IP connectivety IP complete Establish 5 time of day Time of day established Establish security 6 Security established Transfer operational 7 parameters Transfer complete Register with the Cisco 8 uBR7246...
Troubleshooting Guide
Page 7
..., and in two stages: ranging state 1 and ranging state 2. Step 2-Connect to the Cable Modem Telnet to the IP address assigned to the Cable Modem . Step 2-Connect to the cable interface or Ethernet interface. The cable modem waits for the Cisco uBR904 Cable Modem 7 The ranging process adjusts the cable modem's transmit power. Establish the time of Day (TOD) server's address. Perform registration...
..., and in two stages: ranging state 1 and ranging state 2. Step 2-Connect to the Cable Modem Telnet to the IP address assigned to the Cable Modem . Step 2-Connect to the cable interface or Ethernet interface. The cable modem waits for the Cisco uBR904 Cable Modem 7 The ranging process adjusts the cable modem's transmit power. Establish the time of Day (TOD) server's address. Perform registration...
Troubleshooting Guide
Page 8
...between the cable modem and the headend Cisco uBR7246. The most valuable information for troubleshooting the cable interface: a history of what the MAC log file looks like when the cable modem interface successfully comes up and registers with the CMTS. uBR904# show controllers cable-modem 0 mac ...97/141000000/171000000/6000000 98/219000000/225000000/6000000 99/177000000/213000000/6000000 699000000 3 699000000 wait_ucd_state 8 Cisco IOS Release 12.0(3)T Troubleshooting Steps Step 3-Display the Cable Modem's MAC Log File A MAC-layer circular log file is shut down. The output you see...
...between the cable modem and the headend Cisco uBR7246. The most valuable information for troubleshooting the cable interface: a history of what the MAC log file looks like when the cable modem interface successfully comes up and registers with the CMTS. uBR904# show controllers cable-modem 0 mac ...97/141000000/171000000/6000000 98/219000000/225000000/6000000 99/177000000/213000000/6000000 699000000 3 699000000 wait_ucd_state 8 Cisco IOS Release 12.0(3)T Troubleshooting Steps Step 3-Display the Cable Modem's MAC Log File A MAC-layer circular log file is shut down. The output you see...
Troubleshooting Guide
Page 9
Step 3-Display the Cable Modem's MAC Log File 508147.554 CMAC_LOG_UCD_MSG_RCVD 508147.558 CMAC_LOG_UCD_NEW_US_FREQUENCY 508147.558 CMAC_LOG_SLOT_SIZE_CHANGED 508147.622 CMAC_LOG_FOUND_US_CHANNEL 508147.624 CMAC_LOG_STATE_CHANGE 508148.058 CMAC_LOG_MAP_MSG_RCVD 508148.060 ...-9 31.0 dBmV (commanded) dhcp_state 188.188.1.62 4.0.0.1 4.0.0.32 360 platinum.cm establish_tod_state 3107617539 security_association_state configuration_file_state platinum.cm registration_state 1/2 2 establish_privacy_state maintenance_state Troubleshooting Tips for the Cisco uBR904 Cable Modem 9
Step 3-Display the Cable Modem's MAC Log File 508147.554 CMAC_LOG_UCD_MSG_RCVD 508147.558 CMAC_LOG_UCD_NEW_US_FREQUENCY 508147.558 CMAC_LOG_SLOT_SIZE_CHANGED 508147.622 CMAC_LOG_FOUND_US_CHANNEL 508147.624 CMAC_LOG_STATE_CHANGE 508148.058 CMAC_LOG_MAP_MSG_RCVD 508148.060 ...-9 31.0 dBmV (commanded) dhcp_state 188.188.1.62 4.0.0.1 4.0.0.32 360 platinum.cm establish_tod_state 3107617539 security_association_state configuration_file_state platinum.cm registration_state 1/2 2 establish_privacy_state maintenance_state Troubleshooting Tips for the Cisco uBR904 Cable Modem 9
Troubleshooting Guide
Page 10
... of the MAC layer by using variations of the show controllers cable-modem 0 mac command: uBR904# show controllers cable-modem 0 mac log 528302.040 CMAC_LOG_LINK_DOWN 528302.042 CMAC_LOG_RESET_FROM_DRIVER 528302.044 ...CMAC_LOG_STATE_CHANGE 528302.046 CMAC_LOG_DRIVER_INIT_IDB_SHUTDOWN 528302.048 CMAC_LOG_LINK_DOWN 528308.428 CMAC_LOG_DRIVER_INIT_IDB_RESET 528308.432 CMAC_LOG_LINK_DOWN 528308.434 CMAC_LOG_LINK_UP wait_for_link_up_state 0x08098D02 0x08098E5E 10 Cisco...
... of the MAC layer by using variations of the show controllers cable-modem 0 mac command: uBR904# show controllers cable-modem 0 mac log 528302.040 CMAC_LOG_LINK_DOWN 528302.042 CMAC_LOG_RESET_FROM_DRIVER 528302.044 ...CMAC_LOG_STATE_CHANGE 528302.046 CMAC_LOG_DRIVER_INIT_IDB_SHUTDOWN 528302.048 CMAC_LOG_LINK_DOWN 528308.428 CMAC_LOG_DRIVER_INIT_IDB_RESET 528308.432 CMAC_LOG_LINK_DOWN 528308.434 CMAC_LOG_LINK_UP wait_for_link_up_state 0x08098D02 0x08098E5E 10 Cisco...
Troubleshooting Guide
Page 11
... CMAC_LOG_DS_64QAM_LOCK_ACQUIRED communicates the same information. The HRC plan is not supported by Cisco's cable modems since the DOCSIS specification does not mandate their coverage. The cable modem recalls this plan. The field CMAC_LOG_WILL_SEARCH_SAVED_DS_FREQUENCY tells you what frequency the cable modem will scan for the Cisco uBR904 Cable Modem 11 The search table is arranged so that the scanning and synchronization was...
... CMAC_LOG_DS_64QAM_LOCK_ACQUIRED communicates the same information. The HRC plan is not supported by Cisco's cable modems since the DOCSIS specification does not mandate their coverage. The cable modem recalls this plan. The field CMAC_LOG_WILL_SEARCH_SAVED_DS_FREQUENCY tells you what frequency the cable modem will scan for the Cisco uBR904 Cable Modem 11 The search table is arranged so that the scanning and synchronization was...
Troubleshooting Guide
Page 12
... CMAC_LOG_STATE_CHANGE 508148.058 CMAC_LOG_MAP_MSG_RCVD 508148.060 CMAC_LOG_INITIAL_RANGING_MINISLOTS wait_ucd_state 3 20000000 8 1 wait_map_state 40 Event 4-Start Ranging for an upstream channel descriptor (UCD) message from the headend Cisco uBR7246. The cable modem performs ranging in two stages: ranging state 1 and ranging state 2. The field CMAC_LOG_POWER_LEVEL_IS is done to . This is the power level that the ranging...
... CMAC_LOG_STATE_CHANGE 508148.058 CMAC_LOG_MAP_MSG_RCVD 508148.060 CMAC_LOG_INITIAL_RANGING_MINISLOTS wait_ucd_state 3 20000000 8 1 wait_map_state 40 Event 4-Start Ranging for an upstream channel descriptor (UCD) message from the headend Cisco uBR7246. The cable modem performs ranging in two stages: ranging state 1 and ranging state 2. The field CMAC_LOG_POWER_LEVEL_IS is done to . This is the power level that the ranging...
Troubleshooting Guide
Page 13
... CMAC_LOG_DHCP_TZ_OFFSET 508176.990 CMAC_LOG_DHCP_CONFIG_FILE_NAME 508176.992 CMAC_LOG_DHCP_ERROR_ACQUIRING_SEC_SVR_ADDR 508176.996 CMAC_LOG_DHCP_COMPLETE dhcp_state 188.188.1.62 4.0.0.1 4.0.0.32 360 platinum.cm Event 6-Establish the Time of Day The Cisco uBR904 cable modem accesses the Time of day sequence. 508177.120 CMAC_LOG_STATE_CHANGE 508177.126 CMAC_LOG_TOD_REQUEST_SENT 508177.154 CMAC_LOG_TOD_REPLY_RECEIVED 508177.158 CMAC_LOG_TOD_COMPLETE establish_tod_state 3107617539 Event 7-Establish Security The...
... CMAC_LOG_DHCP_TZ_OFFSET 508176.990 CMAC_LOG_DHCP_CONFIG_FILE_NAME 508176.992 CMAC_LOG_DHCP_ERROR_ACQUIRING_SEC_SVR_ADDR 508176.996 CMAC_LOG_DHCP_COMPLETE dhcp_state 188.188.1.62 4.0.0.1 4.0.0.32 360 platinum.cm Event 6-Establish the Time of Day The Cisco uBR904 cable modem accesses the Time of day sequence. 508177.120 CMAC_LOG_STATE_CHANGE 508177.126 CMAC_LOG_TOD_REQUEST_SENT 508177.154 CMAC_LOG_TOD_REPLY_RECEIVED 508177.158 CMAC_LOG_TOD_COMPLETE establish_tod_state 3107617539 Event 7-Establish Security The...
Troubleshooting Guide
Page 14
..., a link level encryption is on in the configuration file that shows baseline privacy enabled. These parameters are successful, the cable modem downloads operational parameters from the cable company's TFTP server. The TEKs are exchanged between the cable modem and the headend Cisco uBR7246. There is a TEK for each SID configured to the uBR904. 14 Cisco IOS Release 12.0(3)T
..., a link level encryption is on in the configuration file that shows baseline privacy enabled. These parameters are successful, the cable modem downloads operational parameters from the cable company's TFTP server. The TEKs are exchanged between the cable modem and the headend Cisco uBR7246. There is a TEK for each SID configured to the uBR904. 14 Cisco IOS Release 12.0(3)T
Troubleshooting Guide
Page 15
... the following commands in real time. show controllers cable-modem filters Displays information about the MAC and SID cable modem filters. Troubleshooting Tips for the Cisco uBR904 Cable Modem 15 Debugs cable interface errors. Debugs map message processing information. show controllers cable-modem lookup-table Displays the cable modem's internal mini-slot lookup table. show controllers cable-modem mac [errors | hardware | Displays detailed MAC-layer...
... the following commands in real time. show controllers cable-modem filters Displays information about the MAC and SID cable modem filters. Troubleshooting Tips for the Cisco uBR904 Cable Modem 15 Debugs cable interface errors. Debugs map message processing information. show controllers cable-modem lookup-table Displays the cable modem's internal mini-slot lookup table. show controllers cable-modem mac [errors | hardware | Displays detailed MAC-layer...
Troubleshooting Guide
Page 16
... the Cisco uBR904 cable modem. Command Reference Command Reference This section describees new and changed commands in the Cisco IOS Release 12.0 command references. • show controllers cable-modem • show controllers cable-modem bpkm • show controllers cable-modem des • show controllers cable-modem filters • show controllers cable-modem lookup-table • show controllers cable-modem mac • show controllers cable-modem phy • show controllers cable-modem...
... the Cisco uBR904 cable modem. Command Reference Command Reference This section describees new and changed commands in the Cisco IOS Release 12.0 command references. • show controllers cable-modem • show controllers cable-modem bpkm • show controllers cable-modem des • show controllers cable-modem filters • show controllers cable-modem lookup-table • show controllers cable-modem mac • show controllers cable-modem phy • show controllers cable-modem...
Troubleshooting Guide
Page 17
...descriptor, and packet descriptor rings. When using this command: uBR904# show controllers cable-modem display begins with information from the BCM3220 chip, DMA ...Cisco uBR904 Cable Modem 17 Then comes MIB statistics from the first few registers of time, it indicates there are packets stuck on the ring. show controllers cable-modem show controllers cable-modem To display high-level controller information about a cable modem, use the show controllers cable-modem number Syntax Description number Controller number inside the cable modem. show controllers cable-modem command in Cisco...
...descriptor, and packet descriptor rings. When using this command: uBR904# show controllers cable-modem display begins with information from the BCM3220 chip, DMA ...Cisco uBR904 Cable Modem 17 Then comes MIB statistics from the first few registers of time, it indicates there are packets stuck on the ring. show controllers cable-modem show controllers cable-modem To display high-level controller information about a cable modem, use the show controllers cable-modem number Syntax Description number Controller number inside the cable modem. show controllers cable-modem command in Cisco...
Troubleshooting Guide
Page 19
... server TOD server Security server Description The unit number of this uBR904 cable modem interface. Indicates the bit to the uBR904 by the factory for MAC messages. Current MAC state of the BCM3220 registers. Downstream frequency (in Hz) that the uBR904 searched for the Cisco uBR904 Cable Modem 19 Frequency on which the transmitter and the tuner communicate. Transmit...
... server TOD server Security server Description The unit number of this uBR904 cable modem interface. Indicates the bit to the uBR904 by the factory for MAC messages. Current MAC state of the BCM3220 registers. Downstream frequency (in Hz) that the uBR904 searched for the Cisco uBR904 Cable Modem 19 Frequency on which the transmitter and the tuner communicate. Transmit...
Troubleshooting Guide
Page 20
... filtering requirements and was received by the uBR904. Total number of data PDUs (protocol data units) of times a timestamp message was not responded to synchronize the cable modem time clock with its index. If tx_count...cable modem. Indicates the memory location of the beginning of the file stored on the cable company's TFTP server that ensures the integrity of times a bandwidth request generated by the uBR904 was received by the uBR904. Indicates current head buffer descriptor. Indicates current head packet descriptor. This condition may be caused by the uBR904. 20 Cisco...
... filtering requirements and was received by the uBR904. Total number of data PDUs (protocol data units) of times a timestamp message was not responded to synchronize the cable modem time clock with its index. If tx_count...cable modem. Indicates the memory location of the beginning of the file stored on the cable company's TFTP server that ensures the integrity of times a bandwidth request generated by the uBR904 was received by the uBR904. Indicates current head buffer descriptor. Indicates current head packet descriptor. This condition may be caused by the uBR904. 20 Cisco...
Troubleshooting Guide
Page 21
.... Hexadecimal values of valid headers received by the uBR904. show controllers cable-modem tuner Troubleshooting Tips for the Cisco uBR904 Cable Modem 21 Related Commands show controllers cable-modem bpkm show controllers cable-modem des show controllers cable-modem filters show controllers cable-modem lookup-table show controllers cable-modem mac show controllers cable-modem phy show controllers cable-modem Table 2 Show Controllers Cable-Modem Field Descriptions (Continued) Field Mac msgs Valid hdrs...
.... Hexadecimal values of valid headers received by the uBR904. show controllers cable-modem tuner Troubleshooting Tips for the Cisco uBR904 Cable Modem 21 Related Commands show controllers cable-modem bpkm show controllers cable-modem des show controllers cable-modem filters show controllers cable-modem lookup-table show controllers cable-modem mac show controllers cable-modem phy show controllers cable-modem Table 2 Show Controllers Cable-Modem Field Descriptions (Continued) Field Mac msgs Valid hdrs...