Cisco uBR924 Troubleshooting Tips Download Page 15 | Manualshive

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Step 4—Interpret the MAC Log File and Take Action

Troubleshooting Tips for the Cisco uBR924 Cable Access Router 15

The search table is arranged so that the first frequencies tried are above 450 MHz. Because many
CATV systems have been upgraded from 450 MHz to 750 MHz coaxial cable, digital channels have
a high chance of being assigned in the new spectrum. The search table omits channels below 90 MHz
and above 860 MHz since the DOCSIS specification does not mandate their coverage.

Some CATV systems use alternative frequency plans such as the IRC (Incrementally Related
Carrier) plan and HRC (Harmonically Related Carrier) plan. Cisco cable access routers support both
of these plans. Most of the IRC channel slots overlap the EIA plan.

Event 3—Obtain Upstream Parameters

The Cisco uBR924 waits for an upstream channel descriptor (UCD) message from the headend
CMTS. The UCD provides transmission parameters for the upstream channel.

508146.124 CMAC_LOG_STATE_CHANGE wait_ucd_state

508147.554 CMAC_LOG_UCD_MSG_RCVD 3

508147.558 CMAC_LOG_UCD_NEW_US_FREQUENCY 20000000

508147.558 CMAC_LOG_SLOT_SIZE_CHANGED 8

508147.622 CMAC_LOG_FOUND_US_CHANNEL 1

508147.624 CMAC_LOG_STATE_CHANGE wait_map_state

508148.058 CMAC_LOG_MAP_MSG_RCVD

508148.060 CMAC_LOG_INITIAL_RANGING_MINISLOTS 40

Event 4—Start Ranging for Power Adjustments

The ranging process adjusts the transmit power of the cable access router. The Cisco uBR924
performs ranging in two stages: ranging state 1 and ranging state 2.

The

CMAC_LOG_POWER_LEVEL_IS

field is the power level that the CMTS told the Cisco uBR924 to

adjust to. The

CMAC_LOG_RANGING_SUCCESS

field indicates that the ranging adjustment was

successful.

508148.062 CMAC_LOG_STATE_CHANGE ranging_1_state

508148.064 CMAC_LOG_RANGING_OFFSET_SET_TO 9610

508148.066 CMAC_LOG_POWER_LEVEL_IS 28.0 dBmV (commanded)

508148.068 CMAC_LOG_STARTING_RANGING

508148.070 CMAC_LOG_RANGING_BACKOFF_SET 0

508148.072 CMAC_LOG_RNG_REQ_QUEUED 0

508148.562 CMAC_LOG_RNG_REQ_TRANSMITTED

508148.566 CMAC_LOG_RNG_RSP_MSG_RCVD

508148.568 CMAC_LOG_RNG_RSP_SID_ASSIGNED 2

508148.570 CMAC_LOG_ADJUST_RANGING_OFFSET 2408

508148.572 CMAC_LOG_RANGING_OFFSET_SET_TO 12018

508148.574 CMAC_LOG_ADJUST_TX_POWER 20

508148.576 CMAC_LOG_POWER_LEVEL_IS 33.0 dBmV (commanded)

508148.578 CMAC_LOG_STATE_CHANGE ranging_2_state

508148.580 CMAC_LOG_RNG_REQ_QUEUED 2

508155.820 CMAC_LOG_RNG_REQ_TRANSMITTED

508155.824 CMAC_LOG_RNG_RSP_MSG_RCVD

508155.826 CMAC_LOG_ADJUST_RANGING_OFFSET -64

508155.826 CMAC_LOG_RANGING_OFFSET_SET_TO 11954

508155.828 CMAC_LOG_RANGING_CONTINUE

508165.892 CMAC_LOG_RNG_REQ_TRANSMITTED

508165.894 CMAC_LOG_RNG_RSP_MSG_RCVD

508165.896 CMAC_LOG_ADJUST_TX_POWER -9

508165.898 CMAC_LOG_POWER_LEVEL_IS 31.0 dBmV (commanded)

508165.900 CMAC_LOG_RANGING_CONTINUE

508175.962 CMAC_LOG_RNG_REQ_TRANSMITTED

508175.964 CMAC_LOG_RNG_RSP_MSG_RCVD

508175.966 CMAC_LOG_RANGING_SUCCESS

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Summary of Contents for uBR924

Page 1: ...he progression of normal data over cable communication events is clearly explained simplifying the resolution of faulty system connections Troubleshooting and diagnostic tasks can be performed on the Cisco uBR924 from a remote location using TELNET Restrictions When using the Cisco uBR924 cable access router keep the following restrictions and limitations in mind The Cisco uBR924 is able to implem...

Page 2: ... or other DOCSIS based CMTS located at the cable operator s headend facility Related Documents For related information on the Cisco uBR924 cable access router refer to the following documents Cisco uBR924 Cable Access Router Quick Start Guide Cisco uBR924 Cable Access Router Installation and Configuration Guide Regulatory Compliance and Safety Info for the Cisco uBR924 Cable Access Router Cisco uB...

Page 3: ... 3 4 NA or later must be running on the Cisco uBR924 cable access router When the cable access router is up and running you can display the IOS release number by entering the show version command from user EXEC mode Note If the Cisco uBR7246 universal broadband router at the cable headend is using MC16 modem cards Cisco IOS Release 11 3 7 NA or later must be running on the Cisco uBR924 cable acces...

Page 4: ...nt applications this MIB allows access to statistics such as MAC driver configuration and counters Cable Device MIB Records statistics related to the configuration and status of the Cisco uBR924 cable access router Statistics include an events log and device status The Cable Device MIB is very similar to the RFI MIB in that both allow access to statistics they are different in that the Cable Devic...

Page 5: ... and cable operators headends downstream The set of frequencies used to send data from a headend to a subscriber FDM Frequency Division Multiplexing A data transmission method in which a number of transmitters share a transmission medium each occupying a different frequency FEC Forward Error Correction In data transmission a process by which additional data is added that is derived from the payloa...

Page 6: ...ber of code points per symbol The QAM rate or the number of points in the QAM constellation can be computed by 2 raised to the power of number of bits symbol For example 16 QAM has 4 bits per symbol 64 QAM has 6 bits per symbol and 256 QAM has 8 bits per symbol QPSK Quadrature Phase Shift Keying A digital modulation method in which there are 2 data bits represented with each baud symbol ranging Th...

Page 7: ...co uBR924 cable access router Figure 1 Sample Topology IP related ATM FDDI 100BT 100BT Analog TV Digital TV Upconvertor ISP home DS RF 54 860 Mhz Fiber Transceiver 80 km Fiber node Telephone pole underground box Distribution amplifier Top amplifier 1000 ft Drop box Cisco u BR904 cable modem 100BT 100BT 100BT Proxy server ISP WAN Cisco uBR7246 CMTS MSD Maintenance Service Organization Cable compani...

Page 8: ...ditional 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 Tab...

Page 9: ... for downstream channel Obtain upstream parameters Upstream parameter acquired Start Ranging Ranging and auto adjust completed Establish IP connectivety IP complete Establish time of day Time of day established Establish security Transfer operational parameters Transfer complete Baseline privacy initialization Baseline privacy initialized Operational 1 2 3 4 5 6 7 8 9 10 12960 Downstream sync esta...

Page 10: ...ransmit power Ranging is performed in two stages ranging state 1 and ranging state 2 4 Establish IP connectivity The Cisco uBR924 sends a DHCP request to obtain an IP address which is needed for IP connectivity The DHCP response also includes the name of a file that contains additional configuration parameters the TFTP server s address and the Time of Day TOD server s address 5 Establish the time ...

Page 11: ...stablish_privacy_state maintenance_state Note To translate this output into more meaningful information see Step 4 Interpret the MAC Log File and Take Action on page 13 Following is an example of what the MAC log file looks like when the Cisco uBR924 interface successfully comes up and registers with the CMTS The output you see is directly related to the messages that are exchanged between the Cis...

Page 12: ..._RANGING_OFFSET 64 508155 826 CMAC_LOG_RANGING_OFFSET_SET_TO 11954 508155 828 CMAC_LOG_RANGING_CONTINUE 508165 892 CMAC_LOG_RNG_REQ_TRANSMITTED 508165 894 CMAC_LOG_RNG_RSP_MSG_RCVD 508165 896 CMAC_LOG_ADJUST_TX_POWER 9 508165 898 CMAC_LOG_POWER_LEVEL_IS 31 0 dBmV commanded 508165 900 CMAC_LOG_RANGING_CONTINUE 508175 962 CMAC_LOG_RNG_REQ_TRANSMITTED 508175 964 CMAC_LOG_RNG_RSP_MSG_RCVD 508175 966 C...

Page 13: ...and descriptions of how to use these keywords see the show controllers cable modem mac command reference page Step 4 Interpret the MAC Log File and Take Action The MAC log file gives a detailed history of initialization events that occurred in the Cisco uBR924 All pertinent troubleshooting information is stored here The following sample log file is broken down into the chronological sequence of ev...

Page 14: ..._scanning_state 508144 350 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 88 453000000 855000000 6000000 508144 354 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 89 93000000 105000000 6000000 508144 356 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 90 111250000 117250000 6000000 508144 360 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 91 231012500 327012500 6000000 508144 362 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 92 33301500...

Page 15: ...rocess adjusts the transmit power of the cable access router The Cisco uBR924 performs ranging in two stages ranging state 1 and ranging state 2 The CMAC_LOG_POWER_LEVEL_IS field is the power level that the CMTS told the Cisco uBR924 to adjust to The CMAC_LOG_RANGING_SUCCESS field indicates that the ranging adjustment was successful 508148 062 CMAC_LOG_STATE_CHANGE ranging_1_state 508148 064 CMAC_...

Page 16: ...AY_ADDRESS 508176 988 CMAC_LOG_DHCP_TZ_OFFSET 360 508176 990 CMAC_LOG_DHCP_CONFIG_FILE_NAME platinum cm 508176 992 CMAC_LOG_DHCP_ERROR_ACQUIRING_SEC_SVR_ADDR 508176 996 CMAC_LOG_DHCP_COMPLETE Event 6 Establish the Time of Day The Cisco uBR924 cable access router accesses the Time of Day server for the current date and time which is used to create time stamps for logged events The CMAC_LOG_TOD_COMP...

Page 17: ...seline Privacy Keys for baseline privacy are exchanged between the Cisco uBR924 and the headend CMTS During this event a link level encryption is performed so that a user s data cannot be sniffed by anyone else who is on the cable network Following is a trace that shows baseline privacy enabled The key management protocol is responsible for exchanging two types of keys KEKs and TEKs The KEK key ex...

Page 18: ...lers cable modem bpkm Displays privacy state information show controllers cable modem des Displays information about the Data Encryption Standard DES engine registers show controllers cable modem filters Displays information about the MAC and SID filters show controllers cable modem lookup table Displays the Cisco uBR924 s internal mini slot lookup table show controllers cable modem mac errors har...

Page 19: ...ow controllers cable modem tuner In Cisco IOS Release 12 0 1 T or later you can search and filter the output for show and more commands This functionality is useful when you need to sort through large amounts of output or if you want to exclude output that you do not need to see To use this functionality enter a show or more command followed by the pipe character one of the keywords begin include ...

Page 20: ...e MAC message buffer descriptor and packet descriptor rings Then comes MIB statistics from the BCM3300 chip DMA base registers to indicate where the rings start global control and status information and finally interrupts for the interrupt code When using this command be sure to check the tx_count and the tx_head and tx_tail values for the buffer descriptor TX BD and packet descriptor TX PD rings ...

Page 21: ...atus 0x80 pak_size 0 04 pak 0x8325F28 buf 0x22480E status 0x80 pak_size 0 05 pak 0x8327CB0 buf 0x22B1C2 status 0x80 pak_size 0 06 pak 0x8323BB8 buf 0x21C936 status 0x80 pak_size 0 RX MAC message ring with 8 entries at 0x201E80 rx_head_mac 0x201E88 1 rx_p_mac 0x831BE80 1 00 pak 0x8326120 buf 0x224F1A status 0x80 pak_size 0 01 pak 0x8324590 buf 0x21EC72 status 0x80 pak_size 0 02 pak 0x8323FA8 buf 0x...

Page 22: ...data_dma_ctrl 0x98 ds_mac_dma_ctrl 0xD8 ds_dma_data_index 0x0007 ds_dma_msg_index 0x0000 upstream dma us_bd_base 0x001FB8 us_pd_base 0x002038 us_dma_ctrl 0x80 us_dma_tx_start 0x00 Global control and status global_ctrl_status 0x00 interrupts irq_pend 0x0008 irq_mask 0x00F7 Table 2 briefly describes some of the fields shown in the display For more information see the Broadcom documentation for the B...

Page 23: ...dend Security server IP address of the security server at the headend Timezone Offset Correction received from the DHCP server to synchronize the Cisco uBR924 time clock with the CMTS Config filename Name of the file stored on the cable company s TFTP server that contains operational parameters for the Cisco uBR924 buffer size Size in bytes of the BCM3300 message buffers RX data PDU ring rx_head r...

Page 24: ... free data PDU buffer descriptors to accept the data Qualified maps Number of times a MAP message passed all filtering requirements and was received by the Cisco uBR924 Qualified syncs Number of times a timestamp message was received by the Cisco uBR924 CRC fails Number of times a MAC message failed a cyclic redundancy CRC check HDR chk fails Number of times a MAC header failed its 16 bit CRC chec...

Page 25: ...registers show controllers cable modem filters Displays the registers in the MAC hardware that are used for filtering received frames show controllers cable modem lookup table Displays the mini slot lookup table inside a Cisco uBR924 show controllers cable modem mac Displays detailed MAC layer information for a Cisco uBR924 show controllers cable modem phy Displays the contents of the registers us...

Page 26: ...pport baseline privacy and the privacy class of service is enabled via the configuration file that is downloaded to the cable access router Baseline privacy code images for the Cisco uBR924 contain k1 in the code image name Examples The following output is displayed when the headend CMTS does not have baseline privacy enabled uBR924 show controllers cable modem 0 bpkm CM Baseline Privacy Key Manag...

Page 27: ...he number of seconds before the current TEK is set to expire that the TEK grace timer begins signaling the TEK state machine to request a replacement key authorization rej wait time Number of seconds the Cisco uBR924 waits before sending another Authorization Request message to the CMTS after it has received an Authorization Reject message kek state The current state of the key encryption key that...

Page 28: ...rmation about the Data Encryption Standard DES engine registers use the show controllers cable modem des command in privileged EXEC mode show controllers cable modem number des Syntax Description Defaults No default behavior or values Command Modes Privileged EXEC number Controller number inside the Cisco uBR924 ...

Page 29: ..._1 0x1234 ds_unencrypted_length 0x0C Table 4 briefly describes some of the fields shown in the display For more information see the Broadcom documentation for the BCM3300 chip Release Modification 11 3 NA This command was first introduced Table 4 Show Controllers Cable Modem DES Field Descriptions Field Description ds_des_key_table Table showing downstream DES keys ds_des_cbc_iv_table Table of dow...

Page 30: ...s high level controller information about a Cisco uBR924 cable access router show controllers cable modem bpkm Displays information about the baseline privacy key management exchange between the Cisco uBR924 and the CMTS show controllers cable modem filters Displays the registers in the MAC hardware that are used for filtering received frames show controllers cable modem lookup table Displays the ...

Page 31: ...controllers cable modem filters command in privileged EXEC mode show controllers cable modem number filters Syntax Description Defaults No default behavior or values Command Modes Privileged EXEC Command History Usage Guidelines Some of the filtering parameters are MAC hardware addresses Service IDs SIDs and upstream channel IDs number Controller number inside the Cisco uBR924 Release Modification...

Page 32: ...mit 0x0001 us_sid_table sid_1 0x0000 sid_2 0x0000 sid_3 0x0000 sid_4 0x0000 max_re_req 0x0010 rang_fifo 0x00 Table 5 briefly describes some of the fields shown in the display For more information see the Broadcom documentation for the BCM3300 chip Table 5 Show Controllers Cable Modem Filters Field Descriptions Field Description ds_mac_da_filters Shows the MAC address of the cable interface and the...

Page 33: ...scription show controllers cable modem Displays high level controller information about a Cisco uBR924 cable access router show controllers cable modem bpkm Displays information about the baseline privacy key management exchange between the Cisco uBR924 and the CMTS show controllers cable modem des Displays information about the Data Encryption Standard DES engine registers show controllers cable ...

Page 34: ...eged EXEC Command History Usage Guidelines This command displays the details of the lookup table The driver uses this table to convert the size of the packets that the Cisco uBR924 wants to transmit into a bandwidth request to the CMTS in mini slots The contents of this table are affected by the upstream symbol rate that is negotiated between the CMTS and the cable access router Use this table to ...

Page 35: ... 1F 1F 1F 1F 1F 1F 1F 1F 170 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 180 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 190 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1A0 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1B0 1F 1F 1F 1F 1F 1F 1F 1F 1F 2D 2D 2D 2D 2D 2D 2D 1C0 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 1D0 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 1E0 2D 2D 2...

Page 36: ...5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 530 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 540 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 550 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 560 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 570 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 580 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 590 68 68 68 68 68 68 68 68 68 68 68 68 68 ...

Page 37: ... 0DC0 0DC0 0DC0 0DC0 0E9C 0E9C 0E9C 0E9C Related Commands Command Description show controllers cable modem Displays high level controller information about a Cisco uBR924 cable access router show controllers cable modem bpkm Displays information about the baseline privacy key management exchange between the Cisco uBR924 and the CMTS show controllers cable modem des Displays information about the D...

Page 38: ... 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 Cisco uBR924 scans for a downstream frequency The most useful keywords for troubleshooting a Cisco uBR924 are log errors and resets See Example 1 Example 2 and Example 3 number Controller number inside the Cisco uBR924 errors Optional Displays a log of th...

Page 39: ...00 00 14 24 864 344 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 96 121756000 169758400 6000300 00 14 24 864 348 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 97 217760800 397769800 6000300 00 14 24 864 354 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 98 73753600 115755700 6000300 00 14 24 864 358 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 99 403770100 997799800 6000300 00 14 24 864 364 CMAC_LOG_WILL_SEARCH_SAVED_DS_FRE...

Page 40: ...74 728 CMAC_LOG_CONFIG_FILE_PROCESS_COMPLETE 00 14 34 874 730 CMAC_LOG_STATE_CHANGE registration_state 00 14 34 874 734 CMAC_LOG_REG_REQ_MSG_QUEUED 00 14 34 874 744 CMAC_LOG_REG_REQ_TRANSMITTED 00 14 34 874 754 CMAC_LOG_REG_RSP_MSG_RCVD 00 14 34 874 756 CMAC_LOG_COS_ASSIGNED_SID 1 16 00 14 34 874 760 CMAC_LOG_RNG_REQ_QUEUED 16 00 14 34 874 768 CMAC_LOG_REGISTRATION_OK 00 14 34 874 770 CMAC_LOG_REG...

Page 41: ...8 284 D01 0 Discover sent no Offer received No available DHCP Server Example 3 The show controllers cable modem 0 mac resets command shows only the entries in the MAC log that begin with the field CMAC_LOG_RESET Collectively presenting these fields provides you with a summary of the most recent reasons why the cable interface was reset Reset messages and brief explanations are included in the foll...

Page 42: ...AC_LOG_RESET_CHANGE_US_WATCHDOG_EXPIRED The Cisco uBR924 was unable to transmit a response to a UCC REQ message CMAC_LOG_RESET_SECURITY_WATCHDOG_EXPIRED The full security exchange with the CMTS took too long CMAC_LOG_RESET_CONFIG_FILE_WATCHDOG_EXPIRED The TFTP server took too long to respond CMAC_LOG_RESET_ALL_FREQUENCIES_SEARCHED All downstream frequencies to be searched have been searched Note T...

Page 43: ...uired values The required values are IP address network mask TFTP server IP address TOD server IP address DOCSIS configuration file name and time zone offset CMAC_LOG_RESET_CANT_START_DS_TUNER_PRCESS The Cisco uBR924 was unable to start the internal process used to manage the downstream tuner CMAC_LOG_RESET_TOO_MANY_DS_LOCKS_LOST Downstream QAM FEC lock has been lost too many times CMAC_LOG_RESET_...

Page 44: ... 11 pak 0x82DE884 buf 0x2246DA status 0x80 pak_size 0 12 pak 0x82DE68C buf 0x223FD2 status 0x80 pak_size 0 13 pak 0x82DE494 buf 0x2238CA status 0x80 pak_size 0 14 pak 0x82DE29C buf 0x2231C2 status 0x80 pak_size 0 15 pak 0x82DE0A4 buf 0x222ABA status 0x80 pak_size 0 16 pak 0x82DDEAC buf 0x2223B2 status 0x80 pak_size 0 17 pak 0x82DDCB4 buf 0x221CAA status 0x80 pak_size 0 18 pak 0x82DDABC buf 0x2215A...

Page 45: ...2E FF FF 04 status 0x00 bd_index 0x0004 len 0x0000 hdr_len 0x0000 ehdr 00 00 00 2E 00 00 05 status 0x00 bd_index 0x0005 len 0x0000 hdr_len 0x0000 ehdr 00 00 00 2E 00 00 06 status 0x00 bd_index 0x0006 len 0x0000 hdr_len 0x0000 ehdr 00 00 00 00 00 00 07 status 0x20 bd_index 0x0007 len 0x0000 hdr_len 0x0000 ehdr 00 00 00 00 00 00 MIB Statistics DS fifo full 0 Rerequests 0 DS mac msg overruns 0 DS dat...

Page 46: ...24 Table 7 Show Controllers Cable Modem MIB Statistics Field Descriptions Field Description DS fifo full Number of times the downstream receive buffer on the Cisco uBR924 has become full Rerequests Number of registration requests sent by the Cisco uBR924 to the CMTS DS mac msg overruns Number of times the DMA controller has had a downstream MAC message and there were no free MAC message buffer des...

Page 47: ...Reg Rsp 0 T1 Timeouts 0 T2 Timeouts 0 T3 Timeouts 4 T4 Timeouts 0 Range Aborts 0 DS ID 1 DS Frequency 663000000 DS Symbol Rate 5056941 DS QAM Mode 64QAM DS Search 88 453000000 855000000 6000000 89 93000000 105000000 6000000 90 111250000 117250000 6000000 91 231012500 327012500 6000000 92 333015000 333015000 6000000 93 339012500 399012500 6000000 94 405000000 447000000 6000000 95 123015000 12901500...

Page 48: ...gth 1 Scrambler on off 1 Burst Descriptor 2 Interval Usage Code 4 Modulation Type 1 Differential Encoding 2 Preamble Length 128 Preamble Value Offset 0 FEC Error Correction 5 FEC Codeword Info Bytes 34 Scrambler Seed 338 Maximum Burst Size 0 Guard Time Size 48 Last Codeword Length 1 Scrambler on off 1 Burst Descriptor 3 Interval Usage Code 5 Modulation Type 1 Differential Encoding 2 Preamble Lengt...

Page 49: ... uBR924 lost synchronization with the downstream channel Invalid Maps Number of times the Cisco uBR924 received invalid MAP messages Invalid UCDs Number of times the Cisco uBR924 received invalid UCD messages Invalid Rng Rsp Number of times the Cisco uBR924 received invalid ranging response messages Invalid Reg Rsp Number of times the Cisco uBR924 received invalid registration response messages T1...

Page 50: ...UCD remains the same the Cisco uBR924 can quickly decide that the remaining fields have not changed and may be able to disregard the remainder of the message Preamble Pattern Byte pattern used for the preamble Burst Descriptor Interval Usage Code A compound type length value TLV encoding that defines for each type of upstream usage interval the physical layer characteristics that are to be used du...

Page 51: ...SID s keying material Retry Wait Timeout Number of seconds the TEK state machine waits for a replacement key for this SID after the TEK grace timer has expired and the request for a replacement key has been made TEK Grace Time Number of seconds before the current TEK is set to expire that the TEK grace timer begins signaling the TEK state machine to request a replacement key Auth Reject Wait Time ...

Page 52: ...rection received from the DHCP server to synchronize the Cisco uBR924 time clock with the CMTS Command Description show controllers cable modem Displays high level controller information about a Cisco uBR924 cable access router show controllers cable modem bpkm Displays information about the baseline privacy key management exchange between the Cisco uBR924 and the CMTS show controllers cable modem...

Page 53: ...phy receive BCM3116 Receiver Registers Chip ID C2C1 rstctl frzctl 20 qamctl 1B lmsctl 0B tpctl 00 fmtctl 24 ffectl 3F irqsts 09 irqmask 00 stoscm 9E rstctr 00 frzctl2 46 dvctl 30 idepth 55 eqlctl 00 tstctl 02 berctl 00 clkset 00 tunset 00 tunctl 03 FFC coefficient registers F0 0067FFBC F1 FF880080 F2 00C1FEFB F3 FF75019D F4 00C5FD89 F5 FF6D0485 F6 FC95F690 F7 2D280000 DFE coefficient registers D00...

Page 54: ...nit FFFFFF rs 343E fec 00 qam 01 pream_len 0018 offset 0000 burst config 1 prbs_init FFFFFE rs 033B fec 1C qam 65 pream_len 0000 offset 0000 burst config 2 prbs_init FFFFFE rs 033B fec 1D qam 65 pream_len 0000 offset 0000 burst config 3 prbs_init FFFFFE rs 033B fec 1E qam 65 burst config 4 prbs_init FFFFFE rs 033B fec 1F qam 65 pream_len 0000 offset 0000 burst config 5 prbs_init FFFFFE rs 033B fec...

Page 55: ...isco uBR924 and the CMTS show controllers cable modem des Displays information about the Data Encryption Standard DES engine registers show controllers cable modem filters Displays the registers in the MAC hardware that are used for filtering received frames show controllers cable modem lookup table Displays the mini slot lookup table inside a Cisco uBR924 show controllers cable modem mac Displays...

Page 56: ...mmand Defaults No default behavior or values Command Modes Privileged EXEC Command History Examples Typical Cisco uBR924 tuner settings are displayed in the following example See Table 9 for output field possibilities and descriptions uBR924 show controllers cable modem 0 tuner Tuner status 0x00 Rx tuner_freq 507000000 symbol_rate 5360736 local_freq 11520000 snr_estimate 17488 ber_estimate 0 lock_...

Page 57: ...hardware used Use the show controllers cable modem 0 mac state command to see the power level in dBmV symbol_rate Indicates the upstream symbol rate in symbols per second that is negotiated between the CMTS and the cable access router Command Description show controllers cable modem Displays high level controller information about a Cisco uBR924 cable access router show controllers cable modem bpk...

Page 58: ...c debug cable modem map Note Troubleshooting the Cisco uBR924 cable access router is typically accomplished using the CMTS at the cable operator s headend facility it is rarely done by directly accessing the Cisco uBR924 For information on troubleshooting the Cisco uBR924 using Cisco uBR7200 series universal broadband routers see the document Cisco uBR7246 Universal Broadband Router Features Also ...

Page 59: ...oaded to the cable access router Baseline privacy code images for the Cisco uBR924 contain k1 in the code image name Examples The following example shows debug output when the headend does not have privacy enabled uBR924 debug cable modem bpkm errors cm_bpkm_fsm machine KEK event state EVENT_4_TIMEOUT STATE_B_AUTH_WAIT new state STATE_B_AUTH_WAIT cm_bpkm_fsm machine KEK event state EVENT_4_TIMEOUT...

Page 60: ...ion on a Cisco uBR924 debug cable modem error Enables debugging messages for the cable interface driver on a Cisco uBR924 debug cable modem interrupts Debugs Cisco uBR924 interrupts debug cable modem mac Troubleshoots the Cisco uBR924 MAC layer debug cable modem map Displays the timing from MAP messages to sync messages and the timing between MAP messages ...

Page 61: ...is completely up bridge table entries learned on the Ethernet interface program the cable MAC data filters The cable MAC hardware filters out any received packets whose addresses are not in the filters In this way the cable interface only receives packets addressed to its own MAC address or an address it has learned on the Ethernet interface Examples The following example shows sample display outp...

Page 62: ...on a Cisco uBR924 debug cable modem error Enables debugging messages for the cable interface driver on a Cisco uBR924 debug cable modem interrupts Debugs Cisco uBR924 interrupts debug cable modem mac Troubleshoots the Cisco uBR924 MAC layer debug cable modem map Displays the timing from MAP messages to sync messages and the timing between MAP messages ...

Page 63: ...Guidelines This command displays detailed output about the sanity checking of received frame formats the acquisition of downstream QAM FEC lock the receipt or non receipt of SYNC messages from the CMTS reception errors and bandwidth request failures Examples The following example shows sample display output for the debug cable modem error privileged EXEC command uBR924 debug cable modem error Mar ...

Page 64: ...ation on a Cisco uBR924 debug cable modem bridge Debugs bridge filter processing information on a Cisco uBR924 debug cable modem interrupts Debugs Cisco uBR924 interrupts debug cable modem mac Troubleshoots the Cisco uBR924 MAC layer debug cable modem map Displays the timing from MAP messages to sync messages and the timing between MAP messages ...

Page 65: ... command has no keywords or arguments Defaults No default behavior or values Command Modes Privileged EXEC Command History Examples The following example shows sample debug output for Cisco uBR924 interrupts uBR924 debug cable modem interrupts BCM3300_rx_mac_msg_interrupt BCM3300_rx_mac_msg_interrupt BCM3300_tx_interrupt BCM3300_rx_mac_msg_interrupt BCM3300_tx_interrupt BCM3300_rx_mac_msg_interrup...

Page 66: ...BR924 debug cable modem bridge Debugs bridge filter processing information on a Cisco uBR924 debug cable modem error Enables debugging messages for the cable interface driver on a Cisco uBR924 debug cable modem mac Troubleshoots the Cisco uBR924 MAC layer debug cable modem map Displays the timing from MAP messages to sync messages and the timing between MAP messages ...

Page 67: ...formation without entering debug mode enter the show controllers cable modem number mac log command The same information is displayed by both commands If the Cisco uBR924 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 Cisco uBR924 scans for a d...

Page 68: ... 528308 470 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 96 135012500 135012500 6000000 Mar 7 01 43 05 528308 474 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 97 141000000 171000000 6000000 Mar 7 01 43 05 528308 478 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 98 219000000 225000000 6000000 Mar 7 01 43 05 528308 482 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 99 177000000 213000000 6000000 Mar 7 01 43 05 528308 486 CMAC...

Page 69: ...G_REQ_TRANSMITTED 574654 024 CMAC_LOG_RNG_RSP_MSG_RCVD 574657 978 CMAC_LOG_WATCHDOG_TIMER 574664 094 CMAC_LOG_RNG_REQ_TRANSMITTED 574664 096 CMAC_LOG_RNG_RSP_MSG_RCVD 574674 164 CMAC_LOG_RNG_REQ_TRANSMITTED 574674 166 CMAC_LOG_RNG_RSP_MSG_RCVD uBR924 no debug cable mac log verbose Cable Modem mac log debugging is off uBR924 574684 234 CMAC_LOG_RNG_REQ_TRANSMITTED 574684 238 CMAC_LOG_RNG_RSP_MSG_RC...

Page 70: ... Mar 7 01 44 06 Symbol Rate 8 Mar 7 01 44 06 Frequency 20000000 Mar 7 01 44 06 Preamble Pattern CC CC CC CC CC CC CC CC CC CC CC CC CC CC 0D 0D Mar 7 01 44 06 Burst Descriptor 0 Mar 7 01 44 06 Interval Usage Code 1 Mar 7 01 44 06 Modulation Type 1 QPSK Mar 7 01 44 06 Differential Encoding 2 OFF Mar 7 01 44 06 Preamble Length 64 Mar 7 01 44 06 Preamble Value Offset 56 Mar 7 01 44 06 FEC Error Corre...

Page 71: ...anagement with Extended Header Mar 7 01 44 06 MAC_PARM 0x02 Mar 7 01 44 06 LEN 0x42 Mar 7 01 44 06 EHDR 0x00 0x00 Mar 7 01 44 06 MAC MANAGEMENT MESSAGE HEADER Mar 7 01 44 06 DA 01E0 2F00 0001 Mar 7 01 44 17 RNG RSP MESSAGE Mar 7 01 44 17 Mar 7 01 44 17 FRAME HEADER Mar 7 01 44 17 FC 0xC2 MAC Management Mar 7 01 44 17 MAC_PARM 0x00 Mar 7 01 44 17 LEN 0x2B Mar 7 01 44 17 MAC MANAGEMENT MESSAGE HEADE...

Page 72: ...line privacy information on a Cisco uBR924 debug cable modem bridge Debugs bridge filter processing information on a Cisco uBR924 debug cable modem error Enables debugging messages for the cable interface driver on a Cisco uBR924 debug cable modem interrupts Debugs Cisco uBR924 interrupts debug cable modem map Displays the timing from MAP messages to sync messages and the timing between MAP messag...

Page 73: ...Defaults No default behavior or values Command Modes Privileged EXEC Command History Examples The following example shows display output for the debug cable modem map privileged EXEC command uBR924 debug cable modem map Cable Modem MAP debugging is on uBR924 Mar 7 20 12 08 595322 942 Min MAP to sync 72 Mar 7 20 12 08 595322 944 Max map to map time is 40 Mar 7 20 12 08 595322 982 Min MAP to sync 63...

Page 74: ...nformation on a Cisco uBR924 debug cable modem bridge Debugs bridge filter processing information on a Cisco uBR924 debug cable modem error Enables debugging messages for the cable interface driver on a Cisco uBR924 debug cable modem interrupts Debugs Cisco uBR924 interrupts debug cable modem mac Troubleshoots the Cisco uBR924 MAC layer ...

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