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Cisco Systems UBR924 manual

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Table of contents for the manual

  • Page 1

    Troubleshooting Tips for the Cisco uBR924 Cable Access Router 1 T roub leshooting Tips f or the Cisco uBR924 Cab le Access Router Feature Summary This document describes the Cisco IOS troubleshooting command s that may be used by cable service providers to v erify co mmunication between a Cisco uBR 924 cable access router and other peripheral devic[...]

  • Page 2

    Related Features and Techno logies 2 Cisco IOS Release 12.0(5)T Note The Cisco uBR924 cable acc ess router is typical ly configured at the headend. Most cable service operators do not permit lo cal configuration at subscriber sites. Caution Before attempting to reconf igure a Cisco uBR924 cable access router at a subscriber site, contact your netwo[...]

  • Page 3

    Related Documents Troubleshooting Tips for the Cisco uBR924 Cable Access Router 3 Prerequisites In order to use the Cisco uBR924 cable access router for data-over -cable app lications, the follo wing conditions must be met: • The Cisco uBR7200 series univ ersal broadband router or other DOCSIS-based C M TS mu st be installed at the cable headend [...]

  • Page 4

    List of Terms 4 Cisco IOS Release 12.0(5)T — Cisco Flash MIB — Bridge MIB — IF MIB — MIB-II • Cisco V oIP MIBs: — Cisco V oice IF MIB — Cisco V oice Dial-Control MIB — Cisco V oice Analog IF MIB — Cisco Dial-Control MIB • Radio Frequency Interf ace Specification—Dev elope d by the Multimedia Cable Network System (MCNS) consort[...]

  • Page 5

    List of Terms Troubleshooting Tips for the Cisco uBR924 Cable Access Router 5 Cable Modem T ermination System (CMTS) — A termination sy st em located at the cab le television system headend or distribution hub whic h provides complementary funct ionality to the cable modems, enabl ing data connectivity to a wide-are network. cable router —A mod[...]

  • Page 6

    List of Terms 6 Cisco IOS Release 12.0(5)T MA C layer —Media Access Control sublayer . Controls access by the cable access router to the CMTS and to the upstream data slots. MCNS —Multimedia Cable Network System Partners Ltd. A consortium of cable companies providing service to the majority of homes in the United Stat es and Canada. This consor[...]

  • Page 7

    List of Terms Troubleshooting Tips for the Cisco uBR924 Cable Access Router 7 CMTS to Cable Modem Netw ork T opolog y Figure 1 shows the physical relationship betw een the devices in the HFC network and the Cisco uBR924 cable access router . Figure 1 Sample T opolog y IP-related ATM, FDDI, 100BT... 100BT Analog TV Digital TV Upconvertor ISP @ home.[...]

  • Page 8

    Step 1—Understand How Basic In itialization Works 8 Cisco IOS Release 12.0(5)T T r oubleshooting Steps T o troubleshoot a m alfunctioning cable m odem, perform the following tasks: • Step 1—Understand How Basic Initialization W orks • Step 2—Connect to the Cisco uBR924 • Step 3—Display the Cisco uBR924 ’ s MA C Log File • Step 4?[...]

  • Page 9

    Step 1—Understand How Basic Initialization Works Troubleshooting Tips for the Cisco uBR924 Cable Access Router 9 Figure 2 Cable Modem Initia lization Flowchart Register with the Cisco uBR7246 Registration complete Power on Scan for downstream channel Obtain upstream parameters Upstream parameter acquired Start Ranging Ranging and auto adjust comp[...]

  • Page 10

    Step 2—Connect to the Cisco uBR924 10 Cisco IOS Release 12.0(5)T . Step 2—Connect to the Cisco uBR924 T elnet to the IP address assigned to the cable inte rf ace or Ethernet interface. If the interface is not up, you will need to access the Cisco IOS software via the RJ-45 console port, which is a physical port on the back of the Cisco uBR924. [...]

  • Page 11

    Step 3—Display the Cisco uBR924’s MAC Log File Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 11 Step 3—Displa y the Cisco uBR924’ s MA C Log File A MA C-layer circular log file is stored inside the Cisco uBR924 . This file contains a history of the log messages such as state event acti vities and timestamp s. This is the mo[...]

  • Page 12

    Step 3—Display the Cisco uBR924’s MAC Log File 12 Cisco IOS Release 12.0(5)T 508144.390 CMAC_LOG_WILL_SEARCH_SAVED_DS_FREQUENCY 699000000 508145.540 CMAC_LOG_UCD_MSG_RCVD 3 508146.120 CMAC_LOG_DS_64QAM_LOCK_ACQUIRED 699000000 508146.122 CMAC_LOG_DS_CHANNEL_SCAN_COMPLETED 508146.124 CMAC_LOG_STATE_CHANGE wait_ucd_state 508147.554 CMAC_LOG_UCD_MS[...]

  • Page 13

    Step 4—Interpret the MAC Log File and Take Action Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 13 508178.318 CMAC_LOG_RNG_REQ_QUEUED 19 508178.320 CMAC_LOG_REGISTRATION_OK 508178.322 CMAC_LOG_REG_RSP_ACK_MSG_QUEUED 0 508178.324 CMAC_LOG_STATE_CHANGE establish_privacy_state 508178.326 CMAC_LOG_NO_PRIVACY 508178.328 CMAC_LOG_STATE[...]

  • Page 14

    Step 4—Interpret the MAC Log File and Take Action 14 Cisco IOS Release 12.0(5)T Ev ent 1—Wait f or the Link to Come Up When the Cisco uBR924 cable access router is powere d on and begins initialization, the first e vent that occurs is that the MA C laye r informs the cable access router driv ers that it needs to reset. The LINK_DOWN and LINK_UP[...]

  • Page 15

    Step 4—Interpret the MAC Log File and Take Action Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 15 The search table is arranged so that the f irst fr equencies tried are abo ve 450 MHz. Because man y CA TV systems have been upgraded from 450 MHz to 750 MHz coaxial cab le, digital channels have a high chance of being assigned in t[...]

  • Page 16

    Step 4—Interpret the MAC Log File and Take Action 16 Cisco IOS Release 12.0(5)T Ev ent 5—Establish IP Connectivity After ranging is complete, the cable interf ace on the cable access router is UP . No w the Cisco uBR924 accesses a remote DHCP server to get an IP address. The DHCP request also includes the name of a file that contains additional[...]

  • Page 17

    Step 4—Interpret the MAC Log File and Take Action Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 17 Ev ent 8 — T ransf er Operational P arameters After the DHCP and security operations are su ccessful, the Cisco uBR924 downloads operational parameters via a configuration f ile located on the cable company’ s TFTP server . The [...]

  • Page 18

    Step 5—Use Additional Troubleshooting Commands 18 Cisco IOS Release 12.0(5)T Ev ent 11 — Enter the Maintenance State As soon as the Cisco uBR924 has successfully co mpleted the above e v ents, it enters the operation al maintenance state and is au thorized to forward traffi c into the cable network. 508178.322 CMAC_LOG_STATE_CHANGE maintenance_[...]

  • Page 19

    Step 5—Use Additional Tr oubleshooti ng Commands Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 19 Command Reference This section describes the commands us ed in Ci sco IOS Release 12.0(5)T for troubleshooti ng th e cable side of the Cisco uBR924 cable access router . The commands used to troubleshoot V oIP a pplications are docum[...]

  • Page 20

    show controllers cable-modem 20 Cisco IOS Release 12.0(5)T show contr ollers cable-modem T o display high-level controll er information about a Cisco u BR924 cable access router, use the sho w controllers cable-modem command in privile ged EXEC mode. show contr o llers cable-modem number Syntax Description Def aults No default behavior or values. C[...]

  • Page 21

    show con troll ers cable-modem Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 21 Examples Foll owing is s ample output fo r the show contr ollers cable-modem 0 command: uBR924# show controllers cable-modem 0 BCM Cable interface 0: BCM3300 unit 0, idb 0x200EB4, ds 0x82D4748, regaddr = 0x800000, reset_mask 0x80 station address 0010.7b[...]

  • Page 22

    show controllers cable-modem 22 Cisco IOS Release 12.0(5)T ehdr: 01 06 02 74 34 11 01 status=0x00 bd_index=0x0001 len=0x0000 hdr_len=0x0000 ehdr: 01 06 02 74 34 11 02 status=0x00 bd_index=0x0002 len=0x0000 hdr_len=0x0000 ehdr: 01 06 02 74 34 11 03 status=0x00 bd_index=0x0003 len=0x0000 hdr_len=0x0000 ehdr: 01 06 02 74 34 11 04 status=0x00 bd_index=[...]

  • Page 23

    show con troll ers cable-modem Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 23 data mcf i lter MA C control filter for dat a. DS Downstream Broadcom rece i ver chip number and ID. US Upstream Broadcom trans mitter chip number and ID. T uner: status Current status of the tuner . Rx: tuner_freq Do wnstream frequenc y (in Hz) th at t[...]

  • Page 24

    show controllers cable-modem 24 Cisco IOS Release 12.0(5)T TX PD ring: tx_head_pd tx_tail_pd ehdr Indicates the memory location of the beginni ng of buf fer information for the transmit packet descriptor ring. Indicates current head packet descriptor . Indicates current tail packet descriptor . Extended MCNS header . MIB Statistics: DS fifo full Nu[...]

  • Page 25

    show con troll ers cable-modem Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 25 Related Commands Command Description show contr ollers cable-modem bpkm Displays information abou t the baseli ne priv acy key management exchange between the Cisco uBR924 and the CMTS. show contr ollers cable-modem des Displays information about the Da[...]

  • Page 26

    show controllers cable-modem bpkm 26 Cisco IOS Release 12.0(5)T show contr ollers cable-modem bpkm T o display inform ation about th e baseline pr i v acy k e y management exchange between the Cisco uBR924 cable access router an d the headend CMTS, use the show contr ollers cable-modem bpkm command in pri vi leged EXEC mode. show contr o llers cabl[...]

  • Page 27

    show controllers cable-modem bpkm Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 27 T able 3 describes the fields shown in the display . Related Commands T able 3 Sho w Control lers Cabl e-Modem bpkm Field Descriptions Field Description authorization wait time The number of seconds the Cisco uBR924 waits for a reply after sending th[...]

  • Page 28

    show controllers cable-modem des 28 Cisco IOS Release 12.0(5)T show contr ollers cable-modem des T o display infor mation about th e Data Encryp tio n Standard (DES) engine registers, use the show controllers cable-modem des command in pri vi leged EXEC mode. show contr o llers cable-modem number des Syntax Description Def aults No default behavior[...]

  • Page 29

    show controllers cable-modem des Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 29 Command History Examples DES engine registers are displa yed in the following example: uBR924# show controllers cable-modem 0 des downstream des: ds_des_key_table: key 0: even 0, odd 0 key 1: even 0, odd 0 key 2: even 0, odd 0 key 3: even 0, odd 0 ds_[...]

  • Page 30

    show controllers cable-modem des 30 Cisco IOS Release 12.0(5)T Related Commands ds_unencrypted_length Specifies the num ber of b ytes that will be unencr ypted at the beginning of th e MAC frame. 0x0C means the f irst 12 bytes are not encrypted, which is what the DOCSIS Baseline Pri vacy specif ication calls for . us_des_ke y_table T able showin g [...]

  • Page 31

    show controllers cable-modem filters Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 31 show contr ollers cable-modem filter s T o display the registers in the MA C hardware that are used for filtering recei ved frames, use the show controllers cable-modem f ilters com man d in privileged EXEC mode. show contr o llers cable-modem num[...]

  • Page 32

    show controllers ca ble-mode m filters 32 Cisco IOS Release 12.0(5)T Examples MA C and SID filter information is displayed in the foll owing example: uBR924# show controllers cable-modem 0 filters downstream mac message processing: ds_mac_da_filters: filter_1=0010.7b43.aa01, filter_2=0000.0000.0000 filter_3=0000.0000.0000, filter_4=0000.0000.0000 d[...]

  • Page 33

    show controllers cable-modem filters Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 33 Related Commands Minislots per request Length of each registration request in mini-slots. burst_ma ps Maps the b urst profiles sa ved in the BCM30 37 registers to interv al usage codes (IUCs). bytes_per_minislot_e xp Number of bytes per e xpansion[...]

  • Page 34

    show controllers cable-modem lookup-table 34 Cisco IOS Release 12.0(5)T show contr ollers cable-modem lookup-tab le T o display the mini-slot lookup table insid e a Cisco uBR924, use the show controllers cable-modem lookup-t able command in privileged EXEC mode. show contr o llers cable-modem number lo okup-table Syntax Description Def aults No def[...]

  • Page 35

    show controll ers cable-mode m lookup-ta bl e Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 35 Examples The mini-slot lookup ta ble is displ ayed in the following example: uBR924# show controllers cable-modem 0 lookup-table Max Burst Size (minislots) = 0x6 Max Burst Length (bytes) = 0x4B PHY Overhead Lookup Table: 000: 01 06 06 06 [...]

  • Page 36

    show controllers cable-modem lookup-table 36 Cisco IOS Release 12.0(5)T 370: 3C 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 380: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 390: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 3A0: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 3B0: 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 3C0: 4B 4B 4B[...]

  • Page 37

    show controll ers cable-mode m lookup-ta bl e Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 37 88: 07BC 07BC 07BC 07BC 07BC 07BC 07BC 07BC 90: 07BC 07BC 07BC 07BC 07BC 0898 0898 0898 98: 0898 0898 0898 0898 0898 0898 0898 0898 A0: 0898 0898 0898 0974 0974 0974 0974 0974 A8: 0974 0974 0974 0974 0974 0974 0974 0974 B0: 0974 0974 0A50[...]

  • Page 38

    show controllers cable-modem mac 38 Cisco IOS Release 12.0(5)T show contr ollers cable-modem mac T o display detailed MA C-layer in form ation for a Cisco uBR924, use the show contr ollers cable-modem mac command in privileged EXEC mode. show contr o llers cable-modem number mac [ errors | hardwar e | log | re s et s | state ] Syntax Description De[...]

  • Page 39

    show controllers cable-modem mac Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 39 Example 1 The follo wing sample display shows the MA C log file for a cable-modem interf ace that has successfully registered with the CMTS: uBR924# show controllers cable-modem 0 mac log 00:14:24: 864.124 CMAC_LOG_DRIVER_INIT_IDB_RESET 0x080B7430 00:[...]

  • Page 40

    show controllers cable-modem mac 40 Cisco IOS Release 12.0(5)T 00:14:32: 872.856 CMAC_LOG_RANGING_SUCCESS 00:14:32: 872.874 CMAC_LOG_STATE_CHANGE dhcp_state 00:14:33: 873.386 CMAC_LOG_DHCP_ASSIGNED_IP_ADDRESS 188.188.1.62 00:14:33: 873.388 CMAC_LOG_DHCP_TFTP_SERVER_ADDRESS 4.0.0.32 00:14:33: 873.392 CMAC_LOG_DHCP_TOD_SERVER_ADDRESS 4.0.0.32 00:14:3[...]

  • Page 41

    show controllers cable-modem mac Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 41 Example 2 MA C error log information is displayed in th e following example, which is also repor ted via SNMP: uBR924# show controllers cable-modem 0 mac errors 74373.574 R02.0 No Ranging Response received. T3 time-out. 74374.660 R02.0 No Ranging Resp[...]

  • Page 42

    show controllers cable-modem mac 42 Cisco IOS Release 12.0(5)T The follo wing example indicates that an e vent in the cable interf ace driver caus ed the interface to reset. This often occurs because a shut or clear command is currently being issued on the interfac e. uBR924# show controllers cable-modem 0 mac resets 527986.444 CMAC_LOG_RESET_FROM_[...]

  • Page 43

    show controllers cable-modem mac Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 43 CMAC_LOG_RESET_SERVICE_NOT_AVAILABLE The CMTS has f ailed the Cisco uBR924’ s registration because a required or requeste d class of service is not av aila ble. CMAC_LOG_RESET_T6_RETRIES_EXHAUSTED The CMTS f ailed too many times to respond to a REG-[...]

  • Page 44

    show controllers cable-modem mac 44 Cisco IOS Release 12.0(5)T Example 4 The follo win g example display for the show controllers cable-modem 0 mac hardware command sho ws the detailed configuration of the interface driv er and the MAC-layer hardware. The most interesting bit is the station address (hardware address). The MIB statistics reflect the[...]

  • Page 45

    show controllers cable-modem mac Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 45 TX BD ring with 8 entries at 0x201FB8, tx_count = 0 tx_head = 0x201FB8 (0), head_txp = 0x82D4888 (0) tx_tail = 0x201FB8 (0), tail_txp = 0x82D4888 (0) 00 pak=0x000000 buf=0x200000 status=0x00 pak_size=0 01 pak=0x000000 buf=0x200000 status=0x00 pak_size[...]

  • Page 46

    show controllers cable-modem mac 46 Cisco IOS Release 12.0(5)T burst profiles: profile 0: 01 19 1D 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 profile 1: 01 19 1D 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [...]

  • Page 47

    show controllers cable-modem mac Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 47 Example 5 The show contr ollers ca ble-modem mac state command summarizes the state of the cable MA C layer and provides a list of do wnstream search frequency bands and the order in which they are searched. If the cable MA C layer is in the wait_for_[...]

  • Page 48

    show controllers cable-modem mac 48 Cisco IOS Release 12.0(5)T Burst Descriptor 0: Interval Usage Code: 1 Modulation Type: 1 Differential Encoding: 2 Preamble Length: 64 Preamble Value Offset: 56 FEC Error Correction: 0 FEC Codeword Info Bytes: 16 Scrambler Seed: 338 Maximum Burst Size: 1 Guard Time Size: 8 Last Codeword Length: 1 Scrambler on/off:[...]

  • Page 49

    show controllers cable-modem mac Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 49 COS 1: Assigned SID: 5 Max Downstream Rate: 4000000 Max Upstream Rate: 2000000 Upstream Priority: 7 Min Upstream Rate: 100000 Max Upstream Burst: 12 Privacy Enable: TRUE Ranging Backoff Start: 0 (at initial ranging) Ranging Backoff End: 4 (at initial [...]

  • Page 50

    show controllers cable-modem mac 50 Cisco IOS Release 12.0(5)T DS Symbol Rate Downstream fre quenc y in symbols per second. DS QAM Mode Downstream modulation sche me being used by the Cisco uBR924. DS Search Frequency bands scann ed b y the Ci sco uBR924 when searching for a downstream channel. The Cisco uBR924’ s default frequency bands correspo[...]

  • Page 51

    show controllers cable-modem mac Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 51 Maximum Burst Size Maximum number of mini-slots th at can be transmitted durin g this b urst type. When the interv al type is Short Dat a Grant, this v alue must be greate r than 0. If this v alue is 0, the bu rst si ze is limited else where. Guard T [...]

  • Page 52

    show controllers cable-modem mac 52 Cisco IOS Release 12.0(5)T Related Commands Ranging Backof f End Final back-of f windo w for initial ranging contention, expressed as a po wer of 2. V alid values are from 0 to 15. Data Backof f Start Initial back-off windo w for contention data and requests, expressed as a po wer of 2. V alid values are from 0 t[...]

  • Page 53

    show controllers cable-modem phy Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 53 show contr ollers cabl e-modem ph y T o display the contents of the registers used in the do wnstr eam physical hardware of the Cisco uBR924 cable access router , use the show controllers cable-modem phy command in pri vile ged EXEC m ode. show contr [...]

  • Page 54

    show controllers cable-modem phy 54 Cisco IOS Release 12.0(5)T ldsft=B0EE ldsnre=0098AF ldif=0D004E ldbbi=00000000 ldbbq=00000000 ldali=032E00 ldaii=E62AF2 ldbrfo=705A05 ldbri=F9CDC200 lddrfo=007E7D lddri=007EF0 FEC correctable error count: 0 FEC uncorrectable error count: 0 Bit Error Rate Count: 0 Physical transmit registers are di splayed in the [...]

  • Page 55

    show controllers cable-modem phy Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 55 Related Commands Command Description show contr ollers cable-modem Displays high-l evel controller information about a Cisco uBR924 cable access router . show contr ollers cable-modem bpkm Displays information abou t the baseli ne priv acy key managem[...]

  • Page 56

    show controllers cable-mode m tuner 56 Cisco IOS Release 12.0(5)T show contr ollers cable-modem tuner T o display the settings for the upstream and do w nst ream tuners used by a Cisco uBR924 cable access router , use the show controllers cabl e- modem tu ner command in privileged EXEC mode. show contr o llers cable-modem tuner Syntax Description T[...]

  • Page 57

    show controllers cable-modem tuner Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 57 T able 9 Show Controllers Cable-Modem T uner Field Description s Related Commands Field Description tuner_freq Indicates the current downstream frequenc y . symbol_rate Indicates the downstream symbol rate in symbols per second. local_freq Frequenc [...]

  • Page 58

    show controllers cable-mode m tuner 58 Cisco IOS Release 12.0(5)T Deb ug Commands The follo wing debug commands are ava i lable to troubleshoot a Cisco u BR924 cable access router: • debug cable- modem bpkm • debug cable- modem bridge • debug cable-modem error • debug cable-mo dem interrupts • debug cable- modem mac • debug cable- modem[...]

  • Page 59

    debug cable-modem bpkm Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 59 deb ug cable-modem bpkm T o debug baseline pri vac y inform ation on a Cisco uBR924, use the debug cable-modem bpkm command in privile ged EXEC mode. T o turn the debugging messages off, use t he no form of this command. [ no ] debug cable-modem bpkm { errors |[...]

  • Page 60

    debug cable-mod em b pkm 60 Cisco IOS Release 12.0(5)T Related Commands Command Description debug cable-modem bridg e Deb ugs bridge filter processing information on a Cisco uBR924. debug cable-modem err or Enables debugging messages for th e ca ble interface driv er on a Cisco uBR924. debug cable-modem interrupts Debugs Cisco uBR924 interrupts. de[...]

  • Page 61

    debug cable-mo de m bridge Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 61 deb ug cable-modem bridge Use the debug cable-modem bridge comm a nd in privileged EXEC mode to debug bridge filter processing information on a Ci sco uBR924. T o turn the debugging messages off, use the no form of this command. [ no ] debug cable-modem bri[...]

  • Page 62

    debug cable-mod em bridge 62 Cisco IOS Release 12.0(5)T Related Commands Command Description deb u g cab le-modem bpkm Debugs baseline priv acy information on a Cisco uBR924. debug cable-modem err or Enables debugging messages for th e ca ble interface driv er on a Cisco uBR924. debug cable-modem interrupts Debugs Cisco uBR924 interrupts. debug cab[...]

  • Page 63

    debug cable-modem error Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 63 deb ug cable-modem err or Use the the debu g cable-modem err or comman d in privileged EXEC mode to enable debugging messages for the cable interface driv er . T o turn the debugging messages of f, use the no form of this command. [ no ] debug cable-modem err [...]

  • Page 64

    debug cable-mod em er ror 64 Cisco IOS Release 12.0(5)T Related Commands Command Description deb u g cab le-modem bpkm Debugs baseline priv acy information on a Cisco uBR924. debug cable-modem bridg e Deb ugs bridge filter processing information on a Cisco uBR924. debug cable-modem interrupts Debugs Cisco uBR924 interrupts. debug cable-modem mac T [...]

  • Page 65

    debug cable-modem i nterrupts Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 65 deb ug cable-modem interrupts T o deb ug Cisco uBR924 in terrupts, use the debug cable-modem interrupts command in privileged EXEC mode . T o turn the debugging messages of f, use the no form of this command. [ no ] debug cable-modem interrupts Syntax De[...]

  • Page 66

    debug cable-modem i nterrupts 66 Cisco IOS Release 12.0(5)T Related Commands Command Description deb u g cab le-modem bpkm Debugs baseline priv acy information on a Cisco uBR924. debug cable-modem bridg e Deb ugs bridge filter processing information on a Cisco uBR924. debug cable-modem err or Enables debugging messages for th e ca ble interface dri[...]

  • Page 67

    debug cable-modem mac Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 67 deb ug cable-modem mac T o troubleshoot the Cisco uBR924 MAC layer , use th e debug cable-modem mac command in pri vil eged EXEC mode. T o turn the debugging messages of f, use the no form of this comm and. [ no ] debug cable-modem mac { log [ verbose ] | messag[...]

  • Page 68

    debug cable-mod em ma c 68 Cisco IOS Release 12.0(5)T Examples Example 1 This example shows sample display output from the debug cable-modem mac log command. The fields of the output are the time si nce bootup, the log message, and in some cases a parameter that giv es mor e detail about the log entry . uBR924# debug cable-modem mac log *Mar 7 01:4[...]

  • Page 69

    debug cable-modem mac Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 69 0 events dropped due to lack of a chunk The line “ 0 events dropped due to lack of a chunk ” at the end of a display indicates that no log entries were discarded due to a temporary lack of memory . Th is means the log is accurate and reliable. Example 2 The [...]

  • Page 70

    debug cable-mod em ma c 70 Cisco IOS Release 12.0(5)T In addition, tran smitted REG-R EQs are displayed i n hex dump format. The outp ut from this command is very verbose and is usually not needed for normal interface deb ugging. The comma nd is most useful when atte mpting to attach a Cisco uBR924 cable access router to a CMTS that is not DOCSIS-q[...]

  • Page 71

    debug cable-modem mac Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 71 *Mar 7 01:44:06: Preamble Value Offset - 0 *Mar 7 01:44:06: FEC Error Correction - 5 *Mar 7 01:44:06: FEC Codeword Info Bytes - 34 *Mar 7 01:44:06: Scrambler Seed - 0x0152 *Mar 7 01:44:06: Maximum Burst Size - 0 *Mar 7 01:44:06: Guard Time Size - 48 *Mar 7 01:44[...]

  • Page 72

    debug cable-mod em ma c 72 Cisco IOS Release 12.0(5)T *Mar 7 01:44:20: MAC MANAGEMENT MESSAGE HEADER *Mar 7 01:44:20: DA - 00F0.1EB2.BB61 Related Commands Command Description deb u g cab le-modem bpkm Debugs baseline priv acy information on a Cisco uBR924. debug cable-modem bridg e Deb ugs bridge filter processing information on a Cisco uBR924. deb[...]

  • Page 73

    debug cable-mo dem map Troubleshooting Tips for the Cisco uBR924 Cabl e Access Router 73 deb ug cable-modem map T o display the timing from MAP messages to sync messages and the timing between MAP messages on a Cisco uBR924 cable access router , use the deb ug cable-modem map command in privile ged EXEC mode. T o turn the deb ugging messages of f, [...]

  • Page 74

    debug cable-mod em ma p 74 Cisco IOS Release 12.0(5)T Related Commands Command Description deb u g cab le-modem bpkm Debugs baseline priv acy information on a Cisco uBR924. debug cable-modem bridg e Deb ugs bridge filter processing information on a Cisco uBR924. debug cable-modem err or Enables debugging messages for th e ca ble interface driv er o[...]