Page 2 - Related Features and Technologies; Platforms
Related Features and Technologies 2 Cisco IOS Release 12.0(5)T Note The Cisco uBR924 cable access router is typically configured at the headend. Most cable service operators do not permit local configuration at subscriber sites. Caution Before attempting to reconfigure a Cisco uBR924 cable access ro...
Page 3 - Prerequisites; — To the headend via CATV coaxial cable; Note; Supported MIBs and RFCs; Cisco Standard MIBs:; — Cisco Product MIB
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 applications, the following conditions must be met: • The Cisco uBR7200 series universal broadband router or other DOCSIS-based CMT...
Page 4 - List of Terms
List of Terms 4 Cisco IOS Release 12.0(5)T — Cisco Flash MIB — Bridge MIB — IF MIB — MIB-II • Cisco VoIP MIBs: — Cisco Voice IF MIB — Cisco Voice Dial-Control MIB — Cisco Voice Analog IF MIB — Cisco Dial-Control MIB • Radio Frequency Interface Specification—Developed by the Multimedia Cable Network ...
Page 5 - CMTS—Cable Modem Termination System.
List of Terms Troubleshooting Tips for the Cisco uBR924 Cable Access Router 5 Cable Modem Termination System (CMTS)—A termination system located at the cab le television system headend or distribution hub which provides complementary functionality to the cable modems, enabling data connectivity to a...
Page 6 - narrowband—A single RF frequency.
List of Terms 6 Cisco IOS Release 12.0(5)T MAC 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 ...
Page 7 - CMTS to Cable Modem Network Topology; Figure 1
List of Terms Troubleshooting Tips for the Cisco uBR924 Cable Access Router 7 CMTS to Cable Modem Network Topology Figure 1 shows the physical relationship between the devices in the HFC network and the Cisco uBR924 cable access router. Figure 1 Sample Topology IP-related ATM, FDDI, 100BT... 100BT A...
Page 8 - Troubleshooting Steps; Step 1—Understand How Basic Initialization Works; Step 1—Understand How Basic Initialization Works
Step 1—Understand How Basic Initialization Works 8 Cisco IOS Release 12.0(5)T Troubleshooting Steps To troubleshoot a malfunctioning cable modem, perform the following tasks: • Step 1—Understand How Basic Initialization Works • Step 2—Connect to the Cisco uBR924 • Step 3—Display the Cisco uBR924’s M...
Page 10 - Step 2—Connect to the Cisco uBR924
Step 2—Connect to the Cisco uBR924 10 Cisco IOS Release 12.0(5)T . Step 2—Connect to the Cisco uBR924 Telnet to the IP address assigned to the cable interface 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 phys...
Page 11 - Step 3—Display the Cisco uBR924’s MAC Log File; . These fields show how the Cisco uBR924 progresses
Step 3—Display the Cisco uBR924’s MAC Log File Troubleshooting Tips for the Cisco uBR924 Cable Access Router 11 Step 3—Display the Cisco uBR924’s MAC Log File A MAC-layer circular log file is stored inside the Cisco uBR924. This file contains a history of the log messages such as state event activit...
Page 13 - Step 4—Interpret the MAC Log File and Take Action
Step 4—Interpret the MAC Log File and Take Action Troubleshooting Tips for the Cisco uBR924 Cable 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 508178.32...
Page 14 - Event 1—Wait for the Link to Come Up; Event 2
Step 4—Interpret the MAC Log File and Take Action 14 Cisco IOS Release 12.0(5)T Event 1—Wait for the Link to Come Up When the Cisco uBR924 cable access router is powered on and begins initialization, the first event that occurs is that the MAC layer informs the cable access router drivers that it ne...
Page 15 - Event 3—Obtain Upstream Parameters; The
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 ...
Page 16 - Event 5—Establish IP Connectivity
Step 4—Interpret the MAC Log File and Take Action 16 Cisco IOS Release 12.0(5)T Event 5—Establish IP Connectivity After ranging is complete, the cable interface on the cable access router is UP. Now the Cisco uBR924 accesses a remote DHCP server to get an IP address. The DHCP request also includes t...
Page 17 - Event 8; field shows the filename containing the transmission; Event 9; A successful registration is indicated by the; Comply with Baseline Privacy
Step 4—Interpret the MAC Log File and Take Action Troubleshooting Tips for the Cisco uBR924 Cable Access Router 17 Event 8 — Transfer Operational Parameters After the DHCP and security operations are successful, the Cisco uBR924 downloads operational parameters via a configuration file located on th...
Page 18 - Enter the Maintenance State; Step 5—Use Additional Troubleshooting Commands; You can use other; and debug cable modem commands to troubleshoot different; Command
Step 5—Use Additional Troubleshooting Commands 18 Cisco IOS Release 12.0(5)T Event 11 — Enter the Maintenance State As soon as the Cisco uBR924 has successfully completed the above events, it enters the operational maintenance state and is authorized to forward traffic into the cable network. 508178...
Page 19 - Command Reference
Step 5—Use Additional Troubleshooting Commands Troubleshooting Tips for the Cisco uBR924 Cable Access Router 19 Command Reference This section describes the commands used in Cisco IOS Release 12.0(5)T for troubleshooting the cable side of the Cisco uBR924 cable access router. The commands used to tr...
Page 20 - show controllers cable-modem; show controllers cable-modem number; Syntax Description; No default behavior or values.; Command Modes; Privileged EXEC; Command History; number
show controllers cable-modem 20 Cisco IOS Release 12.0(5)T show controllers cable-modem To display high-level controller information about a Cisco uBR924 cable access router, use the show controllers cable-modem command in privileged EXEC mode. show controllers cable-modem number Syntax Description ...
Page 21 - Examples
show controllers cable-modem Troubleshooting Tips for the Cisco uBR924 Cable Access Router 21 Examples Following is sample output for the show controllers cable-modem 0 command: uBR924# show controllers cable-modem 0 BCM Cable interface 0: BCM3300 unit 0, idb 0x200EB4, ds 0x82D4748, regaddr = 0x8000...
Page 22 - Table 2
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=0x000...
Page 25 - Related Commands; Command Description
show controllers cable-modem Troubleshooting Tips for the Cisco uBR924 Cable Access Router 25 Related Commands Command Description show controllers cable-modem bpkm Displays information about the baseline privacy key management exchange between the Cisco uBR924 and the CMTS. show controllers cable-m...
Page 26 - show controllers cable-modem bpkm; show controllers cable-modem number bpkm
show controllers cable-modem bpkm 26 Cisco IOS Release 12.0(5)T show controllers cable-modem bpkm To display information about the baseline privacy key management exchange between the Cisco uBR924 cable access router and the headend CMTS, use the show controllers cable-modem bpkm command in privileg...
Page 27 - Table 3
show controllers cable-modem bpkm Troubleshooting Tips for the Cisco uBR924 Cable Access Router 27 Table 3 describes the fields shown in the display. Related Commands Table 3 Show Controllers Cable-Modem bpkm Field Descriptions Field Description authorization wait time The number of seconds the Cisc...
Page 28 - show controllers cable-modem des; show controllers cable-modem number des
show controllers cable-modem des 28 Cisco IOS Release 12.0(5)T show controllers cable-modem des To display information 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 D...
Page 29 - DES engine registers are displayed in the following example:; Release; Table 4
show controllers cable-modem des Troubleshooting Tips for the Cisco uBR924 Cable Access Router 29 Command History Examples DES engine registers are displayed 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...
Page 31 - show controllers cable-modem filters; show controllers cable-modem number filters
show controllers cable-modem filters Troubleshooting Tips for the Cisco uBR924 Cable Access Router 31 show controllers cable-modem filters To display the registers in the MAC hardware that are used for filtering received frames, use the show controllers cable-modem filters command in privileged EXEC...
Page 32 - Table 5
show controllers cable-modem filters 32 Cisco IOS Release 12.0(5)T Examples MAC and SID filter information is displayed in the following 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 filt...
Page 34 - show controllers cable-modem lookup-table; show controllers cable-modem number lookup-table
show controllers cable-modem lookup-table 34 Cisco IOS Release 12.0(5)T show controllers cable-modem lookup-table To display the mini-slot lookup table inside a Cisco uBR924, use the show controllers cable-modem lookup-table command in privileged EXEC mode. show controllers cable-modem number lookup...
Page 35 - The mini-slot lookup table is displayed in the following example:
show controllers cable-modem lookup-table Troubleshooting Tips for the Cisco uBR924 Cable Access Router 35 Examples The mini-slot lookup table is displayed in the following example: uBR924# show controllers cable-modem 0 lookup-table Max Burst Size (minislots) = 0x6 Max Burst Length (bytes) = 0x4B P...
Page 38 - show controllers cable-modem mac; errors
show controllers cable-modem mac 38 Cisco IOS Release 12.0(5)T show controllers cable-modem mac To display detailed MAC-layer information for a Cisco uBR924, use the show controllers cable-modem mac command in privileged EXEC mode. show controllers cable-modem number mac [errors | hardware | log | r...
Page 39 - Example 1
show controllers cable-modem mac Troubleshooting Tips for the Cisco uBR924 Cable Access Router 39 Example 1 The following sample display shows the MAC log file for a cable-modem interface that has successfully registered with the CMTS: uBR924# show controllers cable-modem 0 mac log 00:14:24: 864.124...
Page 41 - Example 2; Example 3; . Collectively presenting these fields provides you with a
show controllers cable-modem mac Troubleshooting Tips for the Cisco uBR924 Cable Access Router 41 Example 2 MAC error log information is displayed in the following example, which is also reported via SNMP: uBR924# show controllers cable-modem 0 mac errors 74373.574 R02.0 No Ranging Response received...
Page 42 - Table 6
show controllers cable-modem mac 42 Cisco IOS Release 12.0(5)T The following example indicates that an event in the cable interface driver caused the interface to reset. This often occurs because a shut or clear command is currently being issued on the interface. uBR924# show controllers cable-modem...
Page 44 - Example 4
show controllers cable-modem mac 44 Cisco IOS Release 12.0(5)T Example 4 The following example display for the show controllers cable-modem 0 mac hardware command shows the detailed configuration of the interface driver and the MAC-layer hardware. The most interesting bit is the station address (har...
Page 47 - Example 5; , the information shown in the
show controllers cable-modem mac Troubleshooting Tips for the Cisco uBR924 Cable Access Router 47 Example 5 The show controllers cable-modem mac state command summarizes the state of the cable MAC layer and provides a list of downstream search frequency bands and the order in which they are searched...
Page 49 - Table 8 describes the fields shown in the display.
show controllers cable-modem mac Troubleshooting Tips for the Cisco uBR924 Cable 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 ini...
Page 53 - show controllers cable-modem phy; receive; transmit
show controllers cable-modem phy Troubleshooting Tips for the Cisco uBR924 Cable Access Router 53 show controllers cable-modem phy To display the contents of the registers used in the downstream physical hardware of the Cisco uBR924 cable access router, use the show controllers cable-modem phy comma...
Page 56 - show controllers cable-modem tuner; show controllers cable-modem tuner; There are no key words or arguments for this command.; Defaults
show controllers cable-modem tuner 56 Cisco IOS Release 12.0(5)T show controllers cable-modem tuner To display the settings for the upstream and downstream tuners used by a Cisco uBR924 cable access router, use the show controllers cable-modem tuner command in privileged EXEC mode. show controllers ...
Page 57 - Field
show controllers cable-modem tuner Troubleshooting Tips for the Cisco uBR924 Cable Access Router 57 Table 9 Show Controllers Cable-Modem Tuner Field Descriptions Related Commands Field Description tuner_freq Indicates the current downstream frequency. symbol_rate Indicates the downstream symbol rate...
Page 58 - Debug Commands
show controllers cable-modem tuner 58 Cisco IOS Release 12.0(5)T Debug Commands The following debug commands are available to troubleshoot a Cisco uBR924 cable access router: • debug cable-modem bpkm • debug cable-modem bridge • debug cable-modem error • debug cable-modem interrupts • debug cable-mo...
Page 59 - debug cable-modem bpkm; Debugs Cisco uBR924 privacy errors.; events; Debugs events related to cable baseline privacy.; packets; Debugs baseline privacy packets.
debug cable-modem bpkm Troubleshooting Tips for the Cisco uBR924 Cable Access Router 59 debug cable-modem bpkm To debug baseline privacy information on a Cisco uBR924, use the debug cable-modem bpkm command in privileged EXEC mode. To turn the debugging messages off, use the no form of this command....
Page 60 - debug cable-modem bridge; Debugs Cisco uBR924 interrupts.; debug cable-modem mac; Troubleshoots the Cisco uBR924 MAC layer.; debug cable-modem map
debug cable-modem bpkm 60 Cisco IOS Release 12.0(5)T Related Commands Command Description 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 int...
Page 61 - This command has no keywords or arguments.
debug cable-modem bridge Troubleshooting Tips for the Cisco uBR924 Cable Access Router 61 debug cable-modem bridge Use the debug cable-modem bridge command in privileged EXEC mode to debug bridge filter processing information on a Cisco uBR924. To turn the debugging messages off, use the no form of ...
Page 62 - Debugs baseline privacy information on a Cisco uBR924.; debug cable-modem error
debug cable-modem bridge 62 Cisco IOS Release 12.0(5)T Related Commands Command Description debug cable-modem bpkm Debugs baseline privacy 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 ...
Page 67 - entries while in the maintenance_state are normal when; using the verbose keyword.; Realtime MAC log display.; MAC layer management messages.
debug cable-modem mac Troubleshooting Tips for the Cisco uBR924 Cable Access Router 67 debug cable-modem mac To troubleshoot the Cisco uBR924 MAC layer, use the debug cable-modem mac command in privileged EXEC mode. To turn the debugging messages off, use the no form of this command. [no] debug cabl...
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