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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 .
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.
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 .
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 Ana.
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.
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.
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.
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—Unde.
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 Regist.
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.
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.
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.
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.
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.
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.
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.
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 .
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.
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 .
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.
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.
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=0.
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.
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 .
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 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 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 .
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 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 c.
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 .
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 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.
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).
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 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# sho.
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.
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 .
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 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.
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.
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.
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.
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.
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.
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) .
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.
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.
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 .
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 M.
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.
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.
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.
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 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 l.
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 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 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 .
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- mo.
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.
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-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.
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 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.
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 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.
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 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.
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 .
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 .
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.
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 Codewo.
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-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.
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.
Ein wichtiger Punkt beim Kauf des Geräts Cisco Systems UBR924 (oder sogar vor seinem Kauf) ist das durchlesen seiner Bedienungsanleitung. Dies sollten wir wegen ein paar einfacher Gründe machen:
Wenn Sie Cisco Systems UBR924 noch nicht gekauft haben, ist jetzt ein guter Moment, um sich mit den grundliegenden Daten des Produkts bekannt zu machen. Schauen Sie zuerst die ersten Seiten der Anleitung durch, die Sie oben finden. Dort finden Sie die wichtigsten technischen Daten für Cisco Systems UBR924 - auf diese Weise prüfen Sie, ob das Gerät Ihren Wünschen entspricht. Wenn Sie tiefer in die Benutzeranleitung von Cisco Systems UBR924 reinschauen, lernen Sie alle zugänglichen Produktfunktionen kennen, sowie erhalten Informationen über die Nutzung. Die Informationen, die Sie über Cisco Systems UBR924 erhalten, werden Ihnen bestimmt bei der Kaufentscheidung helfen.
Wenn Sie aber schon Cisco Systems UBR924 besitzen, und noch keine Gelegenheit dazu hatten, die Bedienungsanleitung zu lesen, sollten Sie es aufgrund der oben beschriebenen Gründe machen. Sie erfahren dann, ob Sie die zugänglichen Funktionen richtig genutzt haben, aber auch, ob Sie keine Fehler begangen haben, die den Nutzungszeitraum von Cisco Systems UBR924 verkürzen könnten.
Jedoch ist die eine der wichtigsten Rollen, die eine Bedienungsanleitung für den Nutzer spielt, die Hilfe bei der Lösung von Problemen mit Cisco Systems UBR924. Sie finden dort fast immer Troubleshooting, also die am häufigsten auftauchenden Störungen und Mängel bei Cisco Systems UBR924 gemeinsam mit Hinweisen bezüglich der Arten ihrer Lösung. Sogar wenn es Ihnen nicht gelingen sollte das Problem alleine zu bewältigen, die Anleitung zeigt Ihnen die weitere Vorgehensweise – den Kontakt zur Kundenberatung oder dem naheliegenden Service.
