Manuale d’uso / di manutenzione del prodotto UBR904 del fabbricante Cisco Systems
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Troubleshooting Tip s for the Cisco uBR904 Cable Modem 1 T roub leshooting Tips f or the Cisco uBR904 Cab le Modem The follo wing sections are pro vided: • Feature Summary on page 1 • Prerequisite.
Feature Summary 2 Release 11.3(4)NA List of T erms CA TV —Originally stood for Community Antenn a T elevision. CA TV now refers to an y cable (coaxial/fiber) based system that pro vides television services. Cable modem —Any de vice that modulat es and demodulates digital da ta onto a CA TV plant.
List of Terms Troubleshooting Tip s for the Cisco uBR904 Cable Modem 3 Prerequisites Cisco IOS Release 11.3(4)NA or l ater must be running inside the cable modem.
CMTS to Cable Modem Network Topol ogy 4 Release 11.3(4)NA CMTS to Cable Modem Netw ork T opolog y Figure 1 shows the ph y sical relationship between the devices in the HFC network and the cable modem. Figure 1 Sample T opolog y IP-related ATM, FDDI, 100BT.
Understand How Basic I nitialization Works Troubleshooting Tip s for the Cisco uBR904 Cable Modem 5 T r oubleshooting Tips Perform the following steps to troubleshoot a cable modem: • Step 1—Under.
Troubleshoo ting Tips 6 Release 11.3(4)NA Figure 2 Cable Modem Initi alization Flowchart Register with the Cisco uBR7246 Registration complete Power on Scan for downstream channel Obtain upstream para.
Connect to the Cable Modem Troubleshooting Tip s for the Cisco uBR904 Cable Modem 7 . Connect to the Cable Modem T elnet to the IP address assigned to the cable inte rf ace or Ethernet interface. If the interface is not up, you need to access the Cisco IOS software via the RJ-45 console port, which is a physical port on the back of the cable modem.
Troubleshoo ting Tips 8 Release 11.3(4)NA Displa y the Cable Modem’ s MA C Log File A MA C layer circular log file is inside the cable mo dem. This file contains a history of log messages, such as state ev ent acti vities and ti mestamps, which are used for troublesho oting purposes.
Display the Cable Modem’s MAC Log File Troubleshooting Tip s for the Cisco uBR904 Cable Modem 9 508146.122 CMAC_LOG_DS_CHANNEL_SCAN_COMPLETED 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.
Troubleshoo ting Tips 10 Release 11.3(4)NA Y ou can display other aspects of the MAC layer by using variations of the show controller cable-modem 0 mac command : uBR904# show controller cable-modem 0 .
Interpret the MAC Log File and Take Action Troubleshooting Tips for the Cisco uBR904 Cable Modem 11 Ev ent 2 — Scan for a Do wnstream Channel then Synchronize Different geographical regions and dif ferent cable plants use dif ferent frequency bands.
Troubleshoo ting Tips 12 Release 11.3(4)NA Ev ent 3—Obtain Upstream P arameters The cable modem waits for an upstream channel descriptor mess ages (UCD) from the headend Cisco uBR7246. This is done to retriev e transmi ssion parameters for the upstream channel.
Interpret the MAC Log File and Take Action Troubleshooting Tips for the Cisco uBR904 Cable Modem 13 Ev ent 5—Establish IP Connectivity After ranging is complete, the cable interface on the cable modem is up. No w the cable modem accesses a remote DHCP serv er to get an IP addres s.
Troubleshoo ting Tips 14 Release 11.3(4)NA Ev ent 8 — T ransf er Operational P arameters After the DHCP and security operations are su ccessful, the cable modem do wn loads operational parameters from a cab le company’ s TF TP serv er . These parameters are transferred via a configuration file.
Use Additional Tr oubleshooti ng Commands Troubleshooting Tips for the Cisco uBR904 Cable Modem 15 Ev ent 11 — Enter the Maintenance State As soon as the cable modem is completely up and running, it enters the operational mai ntenance state. 508178.
Command Reference 16 Release 11.3(4)NA Command Reference This section provides new commands for troubleshooting the Cisco uBR904 cable modem. All other commands used with this feature are documented in the Cisco IOS Release 11.
show controller cable-modem Troubleshooting Tips for the Cisco uBR904 Cable Modem 17 show contr oller cable-modem T o display high-lev e l controller info rmation about a cable modem, use the show contr oller cable-modem Pri vileged EXEC command.
Command Reference 18 Release 11.3(4)NA Global control and status: global_ctrl_status=0x00 interrupts: irq_pend=0x0008, irq_mask=0x00F7 Related Commands show contr oller cable-modem bpkm show contr oll.
show controller cable-modem bpkm Troubleshooting Tips for the Cisco uBR904 Cable Modem 19 show contr oller cable-modem bpkm T o display inform ation about th e baseline priv acy k ey management exchange between the cable modem and the headend CMTS, use the show contr oller cable-modem bpkm Pr ivileged EXEC command.
Command Reference 20 Release 11.3(4)NA show contr oller cable-modem des T o display infor mation about th e Data Encryp tio n Standard (DES) engine registers, use the show controller cable-modem des Privileged EXEC command. show contr oller cable-modem des Syntax Description This command has no k ey words or ar guments.
show controller cable-modem des Troubleshooting Tips for the Cisco uBR904 Cable Modem 21 Related Commands show contr oller cable-modem show contr oller cable-modem bpkm show contr oller cable-modem fi.
Command Reference 22 Release 11.3(4)NA show contr oller 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 controller cable-modem filters Privileged EXEC command. show contr oller cable-modem filters Syntax Description There are no key words or ar guments for this command.
show controller ca ble-modem filters Troubleshooting Tips for the Cisco uBR904 Cable Modem 23 Related Commands show contr oller cable-modem show contr oller cable-modem bpkm show contr oller cable-mod.
Command Reference 24 Release 11.3(4)NA show contr oller cable-modem lookup-table T o display the mini-slot lookup tab le inside a cable modem, use the show controller cable-modem lookup-tab l e Priv ileged EXEC command. show contr oller cabl e-modem look up-table Syntax Description This command has no keywords or ar guments.
show controller cable-modem lo okup-table Troubleshooting Tips for the Cisco uBR904 Cable Modem 25 1C 1C 1C 1C 1C 1C 1C 1D 1D 1D 1D 1D 1D 1D 1D 1D 1D 1D 1D 1D 1D 1D 1D 1E 1E 1E 1E 1E 1E 1E 1E 1E 1E 1E.
Command Reference 26 Release 11.3(4)NA show contr oller cable-modem mac T o show detailed MAC layer information for a cable modem, en ter the show cable controller cable-modem number mac Pri vileged EXEC command.
show controller cable-modem mac Troubleshooting Tips for the Cisco uBR904 Cable Modem 27 Sample Display 1 The following sample display sho ws the MAC log f ile for a cable-modem interface that has successfully come up: uBR904# show controller cable-modem 0 mac log *Mar 7 01:42:59: 528302.
Command Reference 28 Release 11.3(4)NA *Mar 7 01:43:15: 528317.958 CMAC_LOG_RNG_RSP_MSG_RCVD *Mar 7 01:43:15: 528317.960 CMAC_LOG_ADJUST_TX_POWER 14 *Mar 7 01:43:15: 528317.962 CMAC_LOG_POWER_LEVEL_IS 34.0 dBmV (commanded) *Mar 7 01:43:15: 528317.964 CMAC_LOG_RANGING_CONTINUE *Mar 7 01:43:16: 528318.
show controller cable-modem mac Troubleshooting Tips for the Cisco uBR904 Cable Modem 29 Sample Displa ys 3 The show controller cable-modem 0 mac resets command sho w s only the en tries in the cable MAC log that begin with the field CMAC_LOG_RESET .
Command Reference 30 Release 11.3(4)NA CMAC_LOG_RESET_PRIVACY_WATCHDOG_EXPIRED The baseline pri vac y excha nge with the CMTS took too long. CMAC_LOG_RESET_CHANGE_US_WATCHDOG_EXPIRED The cable modem was unable to tran smit a response to a UCC-REQ message.
show controller cable-modem mac Troubleshooting Tips for the Cisco uBR904 Cable Modem 31 Sample Display 4 This example display for the show contr oller cable-modem 0 mac hardwar e command shows the detailed configuration of the interface dri ver a nd MA C layer hardware.
Command Reference 32 Release 11.3(4)NA 27 pak=0x82DC904 buf=0x21D65A status=0x80 pak_size=0 28 pak=0x82DC70C buf=0x21CF52 status=0x80 pak_size=0 29 pak=0x82DC514 buf=0x21C84A status=0x80 pak_size=0 30.
show controller cable-modem mac Troubleshooting Tips for the Cisco uBR904 Cable Modem 33 timing recovery circuit: loop_enable=0x00, minislot_divisor=0x00 K0_ctrl=0x06, K1_ctrl=0x07, acq_threshhold=0x0.
Command Reference 34 Release 11.3(4)NA 98 219000000 225000000 6000000 99 177000000 213000000 6000000 US ID: 1 US Frequency: 20000000 US Power Level: 34.
show controller cable-modem mac Troubleshooting Tips for the Cisco uBR904 Cable Modem 35 Baseline Privacy: Auth. Wait Timeout: 10 Reauth. Wait Timeout: 10 Auth.
Command Reference 36 Release 11.3(4)NA show contr oller cable-modem ph y T o display detailed contents about the re gisters used in the downstream physical hardware used by a cable modem, use the show controller cable-modem ph y Pri vileged EXEC command.
show controller cable-modem phy Troubleshooting Tips for the Cisco uBR904 Cable Modem 37 Physical transmit registers are di splayed in the following example: uBR904# show controller cable-modem 0 phy .
Command Reference 38 Release 11.3(4)NA show contr oller cable-modem tuner T o display the settings for the upstream and down stream tuners used by a cable modem, use the sho w controller cabl e-modem tuner Pri vileged EXEC command. show contr oller cable-modem tuner Syntax Description There are no key words or ar guments for this command.
show controller cabl e-modem tuner Troubleshooting Tips for the Cisco uBR904 Cable Modem 39 show contr oller cable-modem mac show contr oller cable-modem phy show interface cable-modem.
Command Reference 40 Release 11.3(4)NA show interface cab le-modem T o display information about the cable mo dem interface on a cable modem, use the sho w interface cable-modem EXEC command.
show interfac e cable-modem Troubleshooting Tips for the Cisco uBR904 Cable Modem 41 The follo wing example displays th e number of packets and each prot ocol type passing through the cable modem interface: uBR904# show int cable-modem 0 accounting cable-modem0 Protocol Pkts In Chars In Pkts Out Chars Out IP 545 185502 159 90240 Trans.
Debug Commands 42 Release 11.3(4)NA Deb ug Commands The following ne w debug commands are av ailable to troublesh oot a cable modem: • debug cable- modem bpkm • debug cable- modem bridge • debug.
debug cable-modem bpkm Troubleshooting Tips for the Cisco uBR904 Cable Modem 43 deb ug cable-modem bpkm T o debug baseline pri vac y inform ation on a cable modem, use the debug cable-modem mac Privileged EXEC command. The no form of this command turns debugging messages off.
Debug Commands 44 Release 11.3(4)NA Related Commands debug cable-modem bridg e debug cable-modem err or debug cable-modem interrupts debug cable-modem mac debug cable-modem map.
debug cable-mo dem bridge Troubleshooting Tips for the Cisco uBR904 Cable Modem 45 deb ug cable-modem bridge Use the debug cable-modem bridge Privileged EXEC co mmand to debug bridge filter processing information on a cable modem. The no form of this command turns debugging messages of f.
Debug Commands 46 Release 11.3(4)NA deb ug cable-modem err or Use the the debug cable-modem err or Privileged EX EC command to enable debugging messages for the cable interface dri ver .
debug cable-modem i nterrupts Troubleshooting Tips for the Cisco uBR904 Cable Modem 47 deb ug cable-modem interrupts Use the debug cable-modem interrupts command to deb ug cable modem interrupts. The no form of this command turns debugging messages off.
Debug Commands 48 Release 11.3(4)NA deb ug cable-modem mac Use the debu g cable-modem mac Privile ged EXEC command to troublesh oot the cable modem MA C layer .
debug cable-modem mac Troubleshooting Tips for the Cisco uBR904 Cable Modem 49 Figure 8 Sample Deb ug Cable-Modem Mac Log Output uBR904# debug cable-modem mac log *Mar 7 01:42:59: 528302.040 CMAC_LOG_LINK_DOWN *Mar 7 01:42:59: 528302.042 CMAC_LOG_RESET_FROM_DRIVER *Mar 7 01:42:59: 528302.
Debug Commands 50 Release 11.3(4)NA Figure 9 compares t he output of the debug cable-modem mac log command with the deb ug cable-modem mac log verbose command.
debug cable-modem mac Troubleshooting Tips for the Cisco uBR904 Cable Modem 51 *Mar 7 01:44:06: control - 03 *Mar 7 01:44:06: version - 01 *Mar 7 01:44:06: type - 02 == UCD *Mar 7 01:44:06: RSVD - 0 *.
Debug Commands 52 Release 11.3(4)NA *Mar 7 01:44:06: *Mar 7 01:44:06: MAP MESSAGE *Mar 7 01:44:06: ----------- *Mar 7 01:44:06: FRAME HEADER *Mar 7 01:44:06: FC - 0xC3 == MAC Management with Extended .
debug cable-mo dem map Troubleshooting Tips for the Cisco uBR904 Cable Modem 53 deb ug cable-modem map Use the debug cable-modem map Privileged EXEC command to display the timing f rom MAP messages to sync messages and the timing between MAP messages.
What to do Next 54 Release 11.3(4)NA What to do Ne xt For more troubleshooting tips, see the ch apter “T roub leshooting the Inst allation” in the Cisco Cable Modem Installation and Configuration Guide .
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Cisco Systems UBR904 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Cisco Systems UBR904 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Cisco Systems UBR904 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Cisco Systems UBR904 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Cisco Systems UBR904, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Cisco Systems UBR904.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Cisco Systems UBR904. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Cisco Systems UBR904 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
