Configuring the Cisco uBR900 Series Cable Access Routers This document addresses the following topics: • • • • • • • • • Feature Overview on page 1 Supported Platforms on page 32 Prerequisites on page 32 Supported MIBs and RFCs on page 33 Configuration Tasks on page 36 Configuration Examples on page 46 VoIP Bridging Configuration Using SGCP on page 52 Debug Commands on page 118 Glossary on page 135 Feature Overview Cisco uBR900 series cable access routers are fully-functional Cisco IOS routers and standa
Feature Overview Cisco IOS Software Feature Sets This section briefly describes the common feature sets supported by the Cisco uBR900 series cable access routers. Each feature set contains a number of features that provide a specific functionality such as Voice over IP (VoIP) or virtual private network (VPN) access.
Cisco IOS Software Feature Sets Base IP Bridging Base IP Bridging includes full and DOCSIS-compliant bridging and DOCSIS Baseline Privacy. The Base IP Bridging feature set allows the Cisco uBR900 series cable access router to function as a DOCSIS 1.0 cable modem and to interoperate with any DOCSIS 1.0-qualified CMTS. It provides basic high-speed Internet connectivity for users who want to connect only one computer to the cable network.
Feature Overview In firewall mode, the Cisco uBR900 series cable access router provides a high-speed Internet connection for an office’s local network while protecting the computers on the office network from common attacks such as denial of service attacks and destructive Java applets, as well as real-time alerts of such attacks. The Small Office feature set can be optionally extended with support for IPSec encryption to ensure that the traffic passed over the Internet cannot be intercepted.
Data Operations Figure 1 Typical Cisco Broadband Data Cable System WAN Switch/router CMTS rack equipment Combiner Tx Fiber Rx Servers Internal backbone and worldwide internet HFC cable plant Cable System Headend Upstream and downstream data interfaces Operation support system interface Downstream RF interface Upstream RF interface 18197 Cisco uBR900 series cable access router Residence or SOHO subscriber site: subscriber RF interface Ethernet interface Operating Modes The broadband data cable
Feature Overview Note Interactive games are the exception. Although low latency is required in gaming applications, high upstream data throughput is not demanded since the volume of data transmitted upstream is typically small.
Data Operations Table 1 Cisco uBR900 Series Cable Access Router Data Specifications (continued) Description Downstream Values Upstream Values Security DES decryption: DOCSIS Baseline Privacy (BPI), 40 bit-, 56 bit- and 168 bit DES encryption, as controlled by the headend and configuration files. DES encryption Note Cisco IOS images must contain encryption software at both the CMTS and the Cisco uBR900 series. Both routers must be enabled and properly configured to support encryption.
Feature Overview The Cisco uBR900 series complies with the DOCSIS standards for interoperable cable access routers; it supports full transparent bridging as well as DOCSIS-compliant transparent bridging. Note If the attached CPE devices and the coaxial cable interface are in different IP subnets, the cable interface must have a secondary address.
Data Operations Cisco uBR900 Series Cable Access Router in a Routing Configuration with a Hub CATV coaxial cable Cable Modem Ethernet Cisco uBR7246 CMTS Ethernet LAN HUB 13306 Figure 3 HFC network Layer 2 Tunneling Protocol Layer 2 Tunneling Protocol (L2TP) is an emerging Internet Engineering Task Force (IETF) standard that combines the best features of two existing tunneling protocols: Cisco’s Layer 2 Forwarding (L2F) and Microsoft’s Point-to-Point Tunneling Protocol (PPTP).
Feature Overview Port Address Translation (PAT) is a similar mechanism that enables all internal hosts to share a single registered IP address (many-to-one translation).
Voice Over IP Operations Figure 4 Simplified VoIP Over Cable Network Gateway/PSTN Service provider backbone CMTS rack equipment Gatekeeper or calling agents Cisco uBR924 Calling party Residence or SOHO subscriber site 1 Policy server HFC cable plant Cisco uBR924 Called party Residence or SOHO subscriber site 2 18194 HFC cable plant CMTS rack equipment Your company can then deploy IP telephony as a local-loop bypass service where voice packets are transferred from the CMTS to: • • A telephony
Feature Overview • In general, fax/modem cards are not supported over VoIP links. Contact your network management, provisioning, or operations team to determine what your network supports. Voice Handling The Cisco uBR924 cable access router supports the following compression and decompression algorithms (CODECs): • • • • • • • • • • G.711 A Law 64000 bps G.711 u Law 64000 bps G.723.1 5300 bps G.723.1 6300 bps G.726 16000 bps G.726 24000 bps G.726 32000 bps G.728 16000 bps G.729 Annex-A 8000 bps G.
Voice Over IP Operations The Cisco uBR924 cable access router supports the following service classes: • The first CoS in the router’s configuration file is configured as the “Tiered Best Effort Type Class” used by the router as the primary QoS for all regular data traffic. The class has no minimum upstream rate specified for the channel. This service class results in the assignment of a primary SID for the router.
Feature Overview Note To support voice configurations involving Cisco gatekeeper products using RAS, the headend must have IP multicast enabled. The cable interface must be designated as the default for RAS to discover the gatekeeper. The gatekeeper then resolves all dialed destinations sent to the RAS protocol.
Voice Over IP Operations Table 2 Cisco uBR924 Cable Access Router Voice Specifications (continued) Metric Value Frequency shift (offset) <= 0.2 Hz (max) <= 0.1 Hz (99.5%) Amplitude tracking (input Level, dBmO): -37 to 0 (on-hook) -37 to +3 (off hook) -50 to -37 (off-hook) -55 to -50 (off-hook) Max Dev. <= .5 dB <= .5 dB <= 1.0dB <= 3.0 dB Crosstalk <= -65 dBmO Amplitude jitter 20-300 Hz 4-300 Hz <= 2.5% Peak <= 2.9% Peak Phase jitter 20 to 300 Hz 4 to 300 Hz <= 1.
Feature Overview Note The backup POTS connection enables only one of the VoIP ports on the Cisco uBR924 to function during a power outage. Calls in progress prior to the power outage will be disconnected. If power is reestablished while a cutover call is in progress, the connection will remain in place until the call is terminated. Once the cutover call is terminated, the router automatically reboots.
Security Features Firewall Cisco uBR900 series cable access routers act as buffers between any connected public and private networks. In firewall mode, Cisco cable access routers use access lists and other methods to ensure the security of the private network. Cisco IOS firewall-specific security features include: • Context-based Access Control (CBAC). This intelligently filters TCP and UDP packets based on the application-layer protocol.
Feature Overview Configuration Options The Cisco uBR900 series cable access router typically ships from the factory ready to work in the Base IP Bridging (DOCSIS-compliant bridging) data-only mode. The cable access router is configured automatically at startup by one or more configuration files generated by the cable service provider and downloaded to the router; no configuration or setup is required other than to connect the router to the cable system.
Configuration Options The following sections describe the initial power-on and provisioning sequences in more detail, as well as the requirements that must be met by both the cable access router and the CMTS before provisioning can be successful. Initial Power-On Sequence When connected and first powered on, the Cisco uBR900 series cable access router performs the following boot procedures: • • Boots the Read Only Memory (ROM) from the ROMMON partition of its flash memory.
Feature Overview Table 3 Cable Access Router Initialization Sequences and Events (continued) Sequence Event Description 4 Establish IP connectivity. After the next MAP message broadcast, the router uses a shared require timeslot to invoke Dynamic Host Configuration Protocol (DHCP) to establish IP connectivity with the TCP/IP network at the headend.
Configuration Options Table 3 Cable Access Router Initialization Sequences and Events (continued) Sequence Event Description 9 Comply with baseline privacy. If baseline privacy is configured and enabled on both the router and CMTS, the router and CMTS negotiate the appropriate encryption/decryption parameters and exchange keys for privacy. After encryption is enabled, all information sent within Ethernet packets is encrypted to prevent interception or modification by an unauthorized party.
Feature Overview The sequence numbers shown in Table 3 are also shown in Figure 5 below. The Cisco uBR900 series cable access router will complete all the steps shown in the table and flowchart each time it needs to reregister with the CMTS.
Basic Troubleshooting Figure 6 illustrates the traffic flow during the initialization process.
Feature Overview The following is the normal progression of states as the Cisco uBR900 series registers with the CMTS: wait_for_link_up_state ds_channel_scanning_state wait_ucd_state wait_map_state ranging_1_state ranging_2_state dhcp_state establish_tod_state security_association_state configuration_file_state registration_state establish_privacy_state maintenance_state Following is an example of a MAC log file for a cable access router that has successfully registered with the headend CMTS.
Basic Troubleshooting 508148.580 508155.820 508155.824 508155.826 508155.826 508155.828 508165.892 508165.894 508165.896 508165.898 508165.900 508175.962 508175.964 508175.966 508175.968 508176.982 508176.984 508176.986 508176.988 508176.988 508176.990 508176.992 508176.996 508177.120 508177.126 508177.154 508177.158 508177.160 508177.162 508177.164 508177.166 508178.280 508178.300 508178.302 508178.306 508178.310 508178.312 508178.314 508178.316 508178.318 508178.320 508178.322 508178.324 508178.
Feature Overview In the following paragraphs, a sample log file is broken down into the chronological sequence of events listed below. Sample comments are also included in the log file.
Basic Troubleshooting The downstream frequency search table is arranged so that the first frequencies that are scanned 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.
Feature Overview 508148.568 508148.570 508148.572 508148.574 508148.576 508148.578 508148.580 508155.820 508155.824 508155.826 508155.826 508155.828 508165.892 508165.894 508165.896 508165.898 508165.900 508175.962 508175.964 508175.
Basic Troubleshooting Note “Full security” was a request made by cable service providers for a very strong authorization and authentication check by the CMTS. The Cisco uBR900 series supports DOCSIS baseline privacy (Event 10), which protects your data from being “sniffed” on the cable network. Event 8—Transfer Operational Parameters After completing the DHCP and security operations, the Cisco uBR900 series downloads operational parameters by downloading a configuration file located on the TFTP server.
Benefits 851.088 CMAC_LOG_STATE_CHANGE establish_privacy_state 851.094 CMAC_LOG_PRIVACY_FSM_STATE_CHANGE machine: KEK, event/state: EVENT_1_PROVISIONED/STATE_A_START, new state: STATE_B_AUTH_WAIT 851.102 CMAC_LOG_BPKM_REQ_TRANSMITTED 851.116 CMAC_LOG_BPKM_RSP_MSG_RCVD 851.120 CMAC_LOG_PRIVACY_FSM_STATE_CHANGE machine: KEK, event/state: EVENT_3_AUTH_REPLY/STATE_B_AUTH_WAIT, new state: STATE_C_AUTHORIZED 856.
Restrictions Restrictions When using the Cisco uBR900 series cable access router, keep the following restrictions and limitations in mind: • The Cisco uBR900 series is able to implement multiples classes of service (CoS) on the cable interface; however, separate CoS streams are only available when the cable access router is connected to a headend that supports multiple CoS per cable access router.
Supported Platforms Supported Platforms The Cisco uBR900 series cable access router is a standalone device; it works in conjunction with the Cisco uBR7246 and the Cisco uBR7223 universal broadband routers. Prerequisites In order to use the Cisco uBR900 series cable access router for data-over-cable or voice-over-cable (VoIP) applications, the following tasks must be completed: • All required CMTS routing and network interface equipment must be installed, configured, and operational.
Supported MIBs and RFCs • The CMTS system administrator must ensure appropriate databases are updated to activate and support the new subscriber account in the provisioning, billing and/or network management systems in place for your network once each cable access router is registered with the CMTS. • • The PC(s) connected to the Cisco uBR900 series cable access router must be configured for IP. Cisco IOS Release 11.3(4)NA or later must be running on the Cisco uBR900 series cable access router.
Supported MIBs and RFCs • Cable-specific MIBs—These MIBs provide information about the cable interface and related information on the Cisco uBR900 series cable access router. They include both DOCSIS-required MIBs and Cisco-specific enterprise MIBs. If your network management applications have not already been configured for the Cisco uBR900 series cable access router, these MIBs must be loaded.
Supported MIBs and RFCs Table 4 Supported MIBs for the Cisco uBR900 Series Cable Access Router (continued) MIB Filename Description Release CISCO-CABLE-MODEM-MIB.my Contains the Cisco enterprise objects for DOCSIS-compliant cable modems (available in an SNMPv2 version only). 12.0(4)XI DOCS-CABLE-DEVICE-MIB DOCSIS-specified MIB for DOCSIS-compliant cable modems (available in an SNMPv2 version only). 12.
Configuration Tasks — xgcpUpDownNotification—Notification sent when the protocol status changes between up and down For descriptions of supported MIBs and how to use MIBs, see Cisco’s MIB web site on CCO at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml. Configuration Tasks The Cisco uBR900 series cable access router typically is configured automatically on power-up using a configuration file generated by the cable service provider and delivered via the CMTS installed at the cable headend.
Configuring a Host Name and Password Configuring a Host Name and Password One of the first configuration tasks you might want to perform is to configure a host name and set an encrypted password. Configuring a host name allows you to distinguish multiple Cisco uBR900 series cable access routers from each other. Setting an encrypted password allows you to prevent unauthorized configuration changes. Note Passwords are case sensitive.
Configuring Ethernet and Cable Access Router Interfaces • Exit global configuration mode and attempt to reenter it using the new enable password: cisco# exit cisco con0 is now available Press RETURN to get started. cisco> enable Password: guessme cisco# Configuration, Verification, and Troubleshooting Tips If you are having trouble: • • Make sure Caps Lock is off. Make sure you entered the correct passwords. Passwords are case sensitive.
Configuring Routing Configuring Routing DOCSIS-compliant transparent bridging is the factory default configuration of the Cisco uBR900 series cable access router. To change the configuration of your cable access router from bridging to routing using the CLI, perform the following tasks, starting in global configuration mode: Step Command Purpose 1 uBR924(config)#interface cable-modem0 Enter interface configuration mode for the cable access router interface.
Configuring Routing Verifying Routing To verify that bridging is not configured, routing is enabled, and that Routing Information Protocol is configured on the interfaces, enter the show startup-config command: uBR924# show startup-config Building configuration... Current configuration: ! version 12.
Configuring Bridging Configuring Bridging The Cisco uBR900 series cable access router is configured for DOCSIS-compliant transparent bridging by default. If it becomes necessary to reconfigure the unit for bridging after it has been configured for routing, you can erase the routing configuration and return the unit to factory default configuration settings, or you can reconfigure the unit manually using the CLI.
Configuring Bridging Step Command Purpose 18 uBR924(config-line)#line vty 0 4 Identify the last line in a contiguous group of virtual terminals you want to configure. 19 uBR924(config-line)#Ctrl-z Return to privileged EXEC mode. Save the configuration to nonvolatile RAM so that it won’t be lost in the event of a reset, power cycle, or power outage. uBR924#copy running-config startup-config Building configuration...
Reestablishing DOCSIS-Compliant Bridging interface cable-modem0 no ip address no ip directed-broadcast no ip route-cache no keepalive cable-modem downstream saved channel 699000000 36 bridge-group 59 bridge-group 59 spanning-disabled ! ip classless ! line con 0 line vty 0 4 login ! end Reestablishing DOCSIS-Compliant Bridging To erase the current non-default cable access router configuration and return the unit to its factory default DOCSIS-compliant bridging configuration, perform the following task from
Customizing the Cable Access Router Interface voice-port 0 ! ! voice-port 1 ! ! interface Ethernet0 no ip address no ip directed-broadcast no ip route-cache bridge-group 59 bridge-group 59 spanning-disabled ! interface cable-modem0 no ip address no ip directed-broadcast no ip route-cache no keepalive cable-modem downstream saved channel 699000000 36 bridge-group 59 bridge-group 59 spanning-disabled ! ip classless no ip http server ! line con 0 transport input none line vty 0 4 login ! end Customizing the
Using Multiple PCs with the Cable Access Router Step Command Purpose 3 uBR924(config-if)#cable-modem downstream saved channel ds-frequency us-power Modify the saved downstream channel setting and upstream power value. If you do this, you must specify an exact downstream frequency and a power value.1 4 uBR924(config-if)#cable-modem fast-search Enable a faster downstream search algorithm.
Configuration Examples Configuration Examples This section provides the following configuration examples: • • • • • • • • • Basic Internet Access Bridging Configuration on page 46 Basic Internet Access Routing Configuration on page 47 Multicast-Enabled Routing Configuration on page 48 VoIP Bridging Configuration Using H.323v2 on page 49 VoIP Routing Configuration Using H.
Basic Internet Access Routing Configuration line con 0 transport input none line vty 0 4 login ! end Basic Internet Access Routing Configuration The Cisco uBR900 series cable access router can be configured to act as a router to preserve IP address space and limit broadcasts that can impact the performance of the network. A sample configuration file follows. Note To configure the Cisco uBR900 series to act as a router, the no cable-modem compliant bridge command must be used.
Configuration Examples Multicast-Enabled Routing Configuration The following configuration is for a Cisco uBR900 series that uses PIM sparse-dense mode and belongs to a specific multicast group. Other multicast routing protocols such as PIM sparse-mode or PIM dense-mode can be used. Current configuration: ! ! Last configuration change at 23:16:44 - Thu Mar 18 1999 ! version 12.
VoIP Bridging Configuration Using H.323v2 VoIP Bridging Configuration Using H.323v2 In this example, the Cisco uBR900 series is configured for bridging, with an H.323v2 dial peer to another Cisco uBR900 series attached to the same downstream interface on the headend CMTS. Current configuration: ! ! Last configuration change at 21:54:41 - Thu Apr 29 1999 ! NVRAM config last updated at 21:56:20 - Thu Apr 29 1999 ! version 12.
Configuration Examples VoIP Routing Configuration Using H.323v2 In this example, the Cisco uBR900 series is configured for IP routing, with an H.323v2 dial peer to another Cisco uBR900 series attached to the same downstream interface on the headend CMTS. Current configuration: ! ! No configuration change since last restart ! version 12.
NAT/PAT Configuration line con 0 exec-timeout 0 0 transport input none line vty 0 4 login ! ! end NAT/PAT Configuration Current configuration: ! ! No configuration change since last restart ! version 12.0 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname uBR924 ! ! ip nat inside source list 1 interface cable-modem0 overload clock timezone - -4 ! ! interface Ethernet0 ip address 10.1.1.1 255.255.255.
Configuration Examples VoIP Bridging Configuration Using SGCP In this example, Cisco uBR924 is configured to support VoIP in bridging mode using SGCP. Note the following in the sample configuration file: • • • SGCP is enabled. The call agent IP address is specified. The SGCP application is specified for each port.
IPSec Configuration ! interface cable-modem0 ip address 188.186.1.14 255.255.0.0 no ip directed-broadcast no ip route-cache no ip mroute-cache cable-modem downstream saved channel 699000000 27 bridge-group 59 bridge-group 59 spanning-disabled ! ip classless no ip http server ! ! line con 0 transport input none line vty 0 4 login ! end IPSec Configuration Note Encryption/decryption is subject to export licensing controls. To support IPSec, the Cisco uBR900 series must be configured in routing mode.
Configuration Examples crypto ipsec transform-set test-transform ah-md5-hmac esp-des esp-md5-hmac ! crypto map test-ipsec local-address cable-modem0 crypto map test-ipsec 10 ipsec-isakmp set peer 30.1.1.1 set transform-set test-transform match address 100 ! interface Ethernet0 ip address 24.1.0.1 255.255.0.0 no ip directed-broadcast ! interface cable-modem0 ip address 10.1.0.25 255.255.0.
L2TP Configuration Current configuration: ! ! Last configuration change at 20:24:59 - Thu Dec 23 1999 ! NVRAM config last updated at 20:34:52 - Thu Dec 23 1999 ! version 12.
Command Reference Command Reference This section describes the following cable-modem interface commands for the Cisco uBR900 series cable access router for Cisco IOS Release 12.
cable-modem compliant bridge cable-modem compliant bridge To enable DOCSIS-compliant transparent bridging for a cable access router interface at startup, use the cable-modem compliant command from interface configuration mode. Use the no form of this command to disable DOCSIS-compliant bridging for the interface. cable-modem compliant bridge no cable-modem compliant bridge Syntax Description This command has no arguments or keywords.
cable-modem compliant bridge Related Commands 58 Command Description cable-modem downstream saved channel Modifies the saved downstream channel setting and upstream power value on the cable interface of a Cisco uBR900 series. cable-modem fast-search Enables a faster downstream search algorithm on the cable interface of a Cisco uBR900 series. cable-modem upstream preamble qpsk Enables the QPSK modulation scheme in the upstream direction from the Cisco uBR900 series to the CMTS.
cable-modem downstream saved channel cable-modem downstream saved channel To modify the saved downstream channel setting and upstream power value on a cable access router interface, enter the cable-modem downstream saved channel command from interface configuration mode. Use the no form of this command to remove the saved settings, which will be resaved at the next initialization cycle.
cable-modem downstream saved channel Related Commands 60 Command Description cable-modem compliant bridge Enables DOCSIS-compliant transparent bridging on the Cisco uBR900 series at startup. cable-modem fast-search Enables a faster downstream search algorithm on the cable interface of a Cisco uBR900 series. cable-modem upstream preamble qpsk Enables the QPSK modulation scheme in the upstream direction from the Cisco uBR900 series to the CMTS.
cable-modem fast-search cable-modem fast-search To enable a faster downstream search algorithm on a cable access router interface, use the cable-modem fast-search command from interface configuration mode. Use the no form of this command to disable the downstream fast-search feature. cable-modem fast-search no cable-modem fast-search Syntax Description There are no keywords or arguments for this command. Defaults Disabled Command Modes Interface configuration Command History Release Modification 11.
cable-modem fast-search Related Commands 62 Command Description cable-modem compliant bridge Enables DOCSIS-compliant transparent bridging on the Cisco uBR900 series at startup. cable-modem downstream saved channel Modifies the saved downstream channel setting and upstream power value on the cable interface of a Cisco uBR900 series. cable-modem upstream preamble qpsk Enables the QPSK modulation scheme in the upstream direction from the Cisco uBR900 series to the CMTS.
cable-modem upstream preamble qpsk cable-modem upstream preamble qpsk To enable the QPSK modulation scheme in the upstream direction from the cable access router interface to the headend, enter the cable-modem upstream preamble qpsk command from interface configuration mode. Use the no form of this command to disable upstream modulation for the interface. cable-modem upstream preamble qpsk no cable-modem upstream preamble qpsk Syntax Description This command has no arguments or keywords.
cable-modem upstream preamble qpsk Related Commands 64 Command Description cable-modem compliant bridge Enables DOCSIS-compliant transparent bridging on the Cisco uBR900 series at startup. cable-modem downstream saved channel Modifies the saved downstream channel setting and upstream power value on the cable interface of a Cisco uBR900 series. cable-modem fast-search Enables a faster downstream search algorithm on the cable interface of a Cisco uBR900 series.
cable-modem voip best-effort cable-modem voip best-effort To allow voice calls to be sent upstream over the cable interface via best effort, use the cable-modem voip best-effort command from interface configuration mode. To disable best-effort voice calls, use the no form of this command. cable-modem voip best-effort no cable-modem voip best-effort Syntax Description This command has no arguments or keywords.
cable-modem voip best-effort Related Commands 66 Command Description cable-modem compliant bridge Enables DOCSIS-compliant transparent bridging on the Cisco uBR900 series at startup. cable-modem downstream saved channel Modifies the saved downstream channel setting and upstream power value on the cable interface of a Cisco uBR900 series. cable-modem fast-search Enables a faster downstream search algorithm on the cable interface of a Cisco uBR900 series.
interface cable-modem interface cable-modem To specify the cable interface on a Cisco uBR900 series cable access router, enter the interface cable-modem command from global configuration mode. interface cable-modem number Syntax Description number The interface number of the cable interface on the rear panel of the cable access router. Defaults Disabled Command Modes Global configuration Command History Release Modification 11.3 NA This command was introduced.
interface cable-modem Related Commands 68 Command Description cable-modem compliant bridge Enables DOCSIS-compliant transparent bridging on the Cisco uBR900 series at startup. cable-modem downstream saved channel Modifies the saved downstream channel setting and upstream power value on the cable interface of a Cisco uBR900 series. cable-modem fast-search Enables a faster downstream search algorithm on the cable interface of a Cisco uBR900 series.
show bridge cable-modem show bridge cable-modem To display bridging information for a Cisco uBR900 series cable access router, enter the show bridge cable-modem command from privileged EXEC mode. show bridge cable-modem number Syntax Description number The interface number of the cable interface on the rear panel of the Cisco uBR900 series. Defaults No default behavior or values. Command Modes Privileged EXEC Command History Release Modification 11.3 NA This command was introduced.
show bridge cable-modem Related Commands 70 Command Description show controllers cable-modem Displays the current DHCP settings on point-to-point interfaces. show interfaces cable-modem Displays information about the cable interface on the Cisco uBR900 series cable access router. Cisco IOS Release 12.
show controllers cable-modem show controllers cable-modem To display high-level controller information about a Cisco uBR900 series cable access router, use the show controllers cable-modem command in privileged EXEC mode. show controllers cable-modem number Syntax Description number Controller number inside the Cisco uBR900 series. Defaults No default behavior or values. Command Modes Privileged EXEC Command History Release Modification 11.3 NA This command was introduced.
show controllers cable-modem 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 = 0x800000, reset_mask 0x80 station address 0010.7b43.aa01 default station address 0010.7b43.
show controllers cable-modem ehdr: 01 06 02 01 status=0x00 ehdr: 01 06 02 02 status=0x00 ehdr: 01 06 02 03 status=0x00 ehdr: 01 06 02 04 status=0x00 ehdr: 01 06 02 05 status=0x00 ehdr: 01 06 02 06 status=0x00 ehdr: 01 06 02 07 status=0x20 ehdr: 01 06 02 74 34 11 bd_index=0x0001 74 34 11 bd_index=0x0002 74 34 11 bd_index=0x0003 74 34 11 bd_index=0x0004 74 34 11 bd_index=0x0005 74 34 11 bd_index=0x0006 74 34 11 bd_index=0x0007 74 34 11 len=0x0000 hdr_len=0x0000 len=0x0000 hdr_len=0x0000 len=0x0000 hdr_len=
show controllers cable-modem Table 6 show controllers cable-modem Field Descriptions (continued) Field Description data mcfilter MAC control filter for data. DS Downstream Broadcom receiver chip number and ID. US Upstream Broadcom transmitter chip number and ID. Tuner: status Current status of the tuner. Rx: tuner_freq Downstream frequency (in Hz) that the Cisco uBR900 series searched for and found. symbol_rate Downstream frequency in symbols per second.
show controllers cable-modem Table 6 show controllers cable-modem Field Descriptions (continued) Field Description TX PD ring: Indicates the memory location of the beginning of buffer information for the transmit packet descriptor ring. tx_head_pd Indicates current head packet descriptor. tx_tail_pd Indicates current tail packet descriptor. ehdr Extended MCNS header.
show controllers cable-modem Related Commands 76 Command Description show controllers cable-modem bpkm Displays information about the baseline privacy key management exchange between the Cisco uBR900 series 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 bpkm show controllers cable-modem bpkm To display information about the baseline privacy key management exchange between the Cisco uBR900 series cable access router and the headend CMTS, use the show controllers cable-modem bpkm command in privileged EXEC mode. show controllers cable-modem number bpkm Syntax Description number Controller number inside the Cisco uBR900 series cable access router. Defaults No default behavior or values.
show controllers cable-modem bpkm Table 7 describes the fields shown in the display. Table 7 show controllers cable-modem bpkm Field Descriptions Field Description authorization wait time The number of seconds the Cisco uBR900 series waits for a reply after sending the Authorization Request message to the CMTS.
show controllers cable-modem des 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 Description number Controller number inside the Cisco uBR900 series. Defaults No default behavior or values. Command Modes Privileged EXEC Command History Release Modification 11.3 NA This command was introduced.
show controllers cable-modem des pb_req_bytes_to_minislots=0x10 us_des_ctrl=0x00, us_des_sid_1= 0x1234 ds_unencrypted_length=0x0C Table 8 briefly describes some of the fields shown in the display. For more information, see the Broadcom documentation for the BCM3300 chip. Table 8 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 downstream DES Cipher Block Chaining mode information.
show controllers cable-modem filters 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 mode. show controllers cable-modem number filters Syntax Description number Controller number inside the Cisco uBR900 series. Defaults No default behavior or values. Command Modes Privileged EXEC Command History Release Modification 11.
show controllers cable-modem filters 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 filter_3=0000.0000.0000, filter_4=0000.0000.
show controllers cable-modem filters Table 9 show controllers cable-modem filters Field Descriptions (continued) Field Description Minislots per request Length of each registration request in mini-slots. burst_maps Maps the burst profiles saved in the BCM3037 registers to interval usage codes (IUCs). bytes_per_minislot_exp Number of bytes per expansion mini-slot. ticks_per_minislot Number of time ticks (6.25-microsecond intervals) in each upstream mini-slot.
show controllers cable-modem lookup-table show controllers cable-modem lookup-table To display the mini-slot lookup table inside a Cisco uBR900 series, use the show controllers cable-modem lookup-table command in privileged EXEC mode. show controllers cable-modem number lookup-table Syntax Description number Controller number inside the Cisco uBR900 series. Defaults No default behavior or values. Command Modes Privileged EXEC Command History Release Modification 11.3 NA This command was introduced.
show controllers cable-modem lookup-table 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 PHY Overhead Lookup Table: 000: 010: 020: 030: 040: 050: 060: 070: 080: 090: 0A0: 0B0: 0C0: 0D0: 0E0: 0F0: 100: 110: 120: 130: 140: 150: 160: 170: 180: 190: 1A0: 1B0: 1C0: 1D0: 1E0: 1F0: 200: 210: 220: 230: 240: 250: 260: 270: 280: 290: 2A0: 2B0: 2C0: 2D0: 2E0: 2F0: 300: 310:
show controllers cable-modem lookup-table 370: 380: 390: 3A0: 3B0: 3C0: 3D0: 3E0: 3F0: 400: 410: 420: 430: 440: 450: 460: 470: 480: 490: 4A0: 4B0: 4C0: 4D0: 4E0: 4F0: 500: 510: 520: 530: 540: 550: 560: 570: 580: 590: 5A0: 5B0: 5C0: 5D0: 5E0: 5F0: 600: 610: 620: 630: 3C 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 68 77 77 77 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 68
show controllers cable-modem lookup-table 88: 90: 98: A0: A8: B0: B8: C0: C8: D0: D8: E0: E8: F0: F8: 07BC 07BC 0898 0898 0974 0974 0A50 0A50 0B2C 0C08 0C08 0CE4 0CE4 0DC0 0DC0 07BC 07BC 0898 0898 0974 0974 0A50 0B2C 0B2C 0C08 0C08 0CE4 0CE4 0DC0 0DC0 07BC 07BC 0898 0898 0974 0A50 0A50 0B2C 0B2C 0C08 0C08 0CE4 0CE4 0DC0 0DC0 07BC 07BC 0898 0974 0974 0A50 0A50 0B2C 0B2C 0C08 0C08 0CE4 0CE4 0DC0 0DC0 07BC 07BC 0898 0974 0974 0A50 0A50 0B2C 0B2C 0C08 0C08 0CE4 0CE4 0DC0 0E9C 07BC 0898 0898 0974 0974 0A5
show controllers cable-modem mac show controllers cable-modem mac To display detailed MAC-layer information for a Cisco uBR900 series, use the show controllers cable-modem mac command in privileged EXEC mode. show controllers cable-modem number mac [errors | hardware | log | resets | state] Syntax Description number Controller number inside the Cisco uBR900 series. errors (Optional) Displays a log of the error events that are reported to SNMP.
show controllers cable-modem mac 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 CMAC_LOG_DRIVER_INIT_IDB_RESET 0x080B7430 00:14:24: 864.128 CMAC_LOG_LINK_DOWN 00:14:24: 864.132 CMAC_LOG_RESET_FROM_DRIVER 00:14:24: 864.134 CMAC_LOG_STATE_CHANGE wait_for_link_up_state 00:14:24: 864.138 CMAC_LOG_LINK_UP 00:14:24: 864.
show controllers cable-modem mac 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 00:14:33: 873.396 CMAC_LOG_DHCP_SET_GATEWAY_ADDRESS 00:14:33: 873.398 CMAC_LOG_DHCP_TZ_OFFSET 60 00:14:33: 873.402 CMAC_LOG_DHCP_CONFIG_FILE_NAME platinum.cm 00:14:33: 873.
show controllers cable-modem mac This output indicates that the Cisco uBR900 series acquired a downstream lock, successfully read a UCD, and successfully read a MAP. However, it was unable to communicate with the CMTS after ranging through all upstream transmit power levels. The Cisco uBR900 series tried to communicate with the CMTS 16 times without success, after which it reset the cable interface to try to find a better downstream frequency.
show controllers cable-modem mac 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 0 mac resets 527986.444 CMAC_LOG_RESET_FROM_DRIVER 528302.042 CMAC_LOG_RESET_FROM_DRIVER 528346.600 CMAC_LOG_RESET_FROM_DRIVER 528444.
show controllers cable-modem mac Table 10 Possible but Uncommon Cable Interface Reset Causes (continued) Message Description CMAC_LOG_RESET_SERVICE_NOT_AVAILABLE The CMTS has failed the Cisco uBR900 series’ registration because a required or requested class of service is not available. CMAC_LOG_RESET_T6_RETRIES_EXHAUSTED The CMTS failed too many times to respond to a REG-REQ message.
show controllers cable-modem mac 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 (hardware address). The MIB statistics reflect the MAC hardware counters for various events, but these counters are typically reset every few seconds, so their contents are not accurate in this display.
show controllers cable-modem mac 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=0 02 pak=0x000000 buf=0x200000 status=0x00 pak_size=0 03 pak=0x000000 buf=0x200000 status=0x00 pak_size=0 04 pak=0x000000 buf=0x200000 status=0x00 pak_size=0 05 pak=0x000000 buf=0x200000 status=0x00 pak_size=0 06 pak=0x000000
show controllers cable-modem mac burst profiles: profile 0: 01 00 00 00 profile 1: 01 00 00 00 profile 2: 01 00 00 00 profile 3: 00 00 00 00 19 00 00 00 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 19 00 00 00 1D 00 00 00 03 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
show controllers cable-modem mac 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. If the cable MAC layer is in the wait_for_link_up_state, the information shown in the display corresponds to the last time the interface was up. This allows useful information to be acquired from this display even though the modem has not been able to range and register.
show controllers cable-modem mac Burst Descriptor 0: Interval Usage Code: Modulation Type: Differential Encoding: Preamble Length: Preamble Value Offset: FEC Error Correction: FEC Codeword Info Bytes: Scrambler Seed: Maximum Burst Size: Guard Time Size: Last Codeword Length: Scrambler on/off: Burst Descriptor 1: Interval Usage Code: Modulation Type: Differential Encoding: Preamble Length: Preamble Value Offset: FEC Error Correction: FEC Codeword Info Bytes: Scrambler Seed: Maximum Burst Size: Guard Time Si
show controllers cable-modem mac COS 1: Assigned SID: Max Downstream Rate: Max Upstream Rate: Upstream Priority: Min Upstream Rate: Max Upstream Burst: Privacy Enable: Ranging Backoff Start: Ranging Backoff End: Data Backoff Start: Data Backoff End: IP Address: Net Mask: 5 4000000 2000000 7 100000 12 TRUE 0 (at initial 4 (at initial 0 (at initial 4 (at initial 0.0.0.0 0.0.0.0 TFTP Server IP Address: Time Server IP Address: Config File Name: Time Zone Offset: 223.255.254.254 188.188.1.
show controllers cable-modem mac Table 12 show controllers cable-modem MAC State Field Descriptions (continued) Field Description DS Frequency Downstream frequency acquired by the Cisco uBR900 series during its last initialization sequence. DS Symbol Rate Downstream frequency in symbols per second. DS QAM Mode Downstream modulation scheme being used by the Cisco uBR900 series. DS Search Frequency bands scanned by the Cisco uBR900 series when searching for a downstream channel.
show controllers cable-modem mac Table 12 show controllers cable-modem MAC State Field Descriptions (continued) Field Description Scrambler Seed 15-bit seed value loaded at the beginning of each burst after the register has been cleared. Not used if scrambler is off. Maximum Burst Size Maximum number of mini-slots that can be transmitted during this burst type. When the interval type is Short Data Grant, this value must be greater than 0. If this value is 0, the burst size is limited elsewhere.
show controllers cable-modem mac Table 12 show controllers cable-modem MAC State Field Descriptions (continued) Field Description Ranging Backoff Start Initial back-off window for initial ranging contention, expressed as a power of 2. Valid values are from 0 to 15. Ranging Backoff End Final back-off window for initial ranging contention, expressed as a power of 2. Valid values are from 0 to 15. Data Backoff Start Initial back-off window for contention data and requests, expressed as a power of 2.
show controllers cable-modem phy show controllers cable-modem phy To display the contents of the registers used in the downstream physical hardware of the Cisco uBR900 series cable access router, use the show controllers cable-modem phy command in privileged EXEC mode. show controllers cable-modem phy {receive | transmit} Syntax Description receive Displays all receiver registers in the downstream physical hardware. transmit Displays all transmitter registers in the upstream physical hardware.
show controllers cable-modem phy ldsft=B0EE ldbbq=00000000 ldbri=F9CDC200 ldsnre=0098AF ldali=032E00 lddrfo=007E7D ldif=0D004E ldaii=E62AF2 lddri=007EF0 ldbbi=00000000 ldbrfo=705A05 FEC correctable error count: 0 FEC uncorrectable error count: 0 Bit Error Rate Count: 0 Physical transmit registers are displayed in the following example: uBR924# show controllers cable-modem BCM3037 Transmitter Registers: part_id = 3037 rev_id test_mode = 00 test_input test_misc = 2009 rst power = 0000 power_2 port = 6F
show controllers cable-modem phy Related Commands Command Description show controllers cable-modem Displays high-level controller information about a Cisco uBR900 series cable access router. show controllers cable-modem bpkm Displays information about the baseline privacy key management exchange between the Cisco uBR900 series and the CMTS. show controllers cable-modem des Displays information about the Data Encryption Standard (DES) engine registers. show controllers cable-modem filters .
show controllers cable-modem tuner show controllers cable-modem tuner To display the settings for the upstream and downstream tuners used by a Cisco uBR900 series cable access router, use the show controllers cable-modem tuner command in privileged EXEC mode. show controllers cable-modem tuner Syntax Description There are no key words or arguments for this command. Defaults No default behavior or values. Command Modes Privileged EXEC Command History Release Modification 11.
show controllers cable-modem tuner Table 13 show controllers cable-modem tuner Field Descriptions Field Description tuner_freq Indicates the current downstream frequency. symbol_rate Indicates the downstream symbol rate in symbols per second. local_freq Frequency on which the transmitter and tuner communicate. snr_estimate Signal to noise estimate in dB X 1000. ber_estimate Bit error rate estimate (always 0).
show dhcp show dhcp To display the current DHCP settings on point-to-point interfaces, enter the show dhcp command from privileged EXEC mode. show dhcp {lease | server} Syntax Description lease Shows DHCP addresses leased from a server. server Shows known DHCP servers. Defaults No default behavior or values. Command Modes Privileged EXEC Command History Release Modification 11.3 NA This command was introduced.
show dhcp Table 14 show dhcp lease Field Descriptions Field Description Temp IP addr IP address leased from the DHCP server for the cable access router interface. Temp subnet mask Temporary subnet mask assigned to the cable access router interface. DHCP Lease server IP address of the DHCP server that assigned an IP address to this client. state Current state of this client (the cable access router interface). Possible states are Bound, Renew, or Rebinding.
show dhcp Table 15 show dhcp server Field Descriptions (continued) Field Description Acks Number of ‘acknowledge’ messages sent by the server to the proxy-client. Naks Number of ‘not acknowledge’ messages sent by the server to the proxy-client. Declines Number of offers from the server that have been declined by the proxy-client. Releases Number of times IP addresses have been relinquished gracefully by the client.
show interfaces cable-modem show interfaces cable-modem To display information about the Cisco uBR900 series cable access router’s cable interface, enter the show interfaces cable-modem command from either user EXEC mode or privileged EXEC mode. show interfaces cable-modem number [accounting | counters | crb | irb | type] Syntax Description number Cable access router interface number.
show interfaces cable-modem Examples Traffic passing through the cable access router interface is shown in the following example: uBR924# show interfaces cable-modem 0 cable-modem0 is up, line protocol is up Hardware is BCM3300, address is 0050.7366.2439 (bia 0050.7366.2439) Internet address is 5.2.0.
show interfaces cable-modem Table 16 show interfaces cable-modem Field Descriptions (continued) Field Description Last input/output Number of hours, minutes, and seconds since the last packet was successfully received/transmitted by the interface. output hang Number of hours, minutes, and seconds since the interface was last reset because of a transmission that took too long. When the number of hours in any of the “Last..” fields exceeds 24, the number of days and hours is displayed.
show interfaces cable-modem Table 16 114 show interfaces cable-modem Field Descriptions (continued) Field Description CRC Number of cyclic redundancy checksums generated by the originating LAN station or far-end device that do not match the checksum calculated from the data received. On a LAN, this usually indicates noise or transmission problems on the LAN interface or the LAN bus itself. A high number of CRCs is usually the result of collisions or a station transmitting bad data.
show interfaces cable-modem To display the number of packets and bytes of each protocol type passing through the cable access router interface, use the accounting option with the show interface cable-modem command: uBR924# show interface cable-modem 0 accounting cable-modem0 Protocol Pkts In Chars In IP 545 185502 Trans. Bridge 3878 964995 ARP 73 3066 Pkts Out 159 12597 86 Chars Out 90240 1611142 4128 Table 17 describes the fields shown in this display.
show interfaces cable-modem Table 18 show interfaces cable-modem Counters Descriptions (continued) Field Description DS Data Overruns Number of times the Cisco uBR900 series’s DMA controller had downstream data and there were no free data PDU buffer descriptors to accept the data. Received MAPs Number of times a MAP message passed all filtering requirements and was received by the Cisco uBR900 series. Received Syncs Number of times a timestamp message was received by the Cisco uBR900 series.
show interfaces cable-modem Table 19 show interfaces cable-modem Routing and Bridging Descriptions (continued) Field Description Act Action to be taken when this address is looked up; choices are to receive or discard the packet. Type MAC address type. Related Commands Command Description cable-modem compliant bridge Enables DOCSIS-compliant transparent bridging on the Cisco uBR900 series at startup.
Debug Commands Debug Commands Note Troubleshooting the Cisco uBR900 series 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 uBR900 series using Cisco uBR7200 series universal broadband routers, see the document Cisco uBR7246 Universal Broadband Router Features.
debug cable-modem bpkm debug cable-modem bpkm To debug baseline privacy information on a Cisco uBR900 series, use the debug cable-modem bpkm command in privileged EXEC mode. To turn the debugging messages off, use the no form of this command. [no] debug cable-modem bpkm {errors | events | packets} Syntax Description errors Debugs Cisco uBR900 series privacy errors. events Debugs events related to cable baseline privacy. packets Debugs baseline privacy packets. Defaults No default behavior or values.
debug cable-modem bpkm Related Commands 120 Command Description debug cable-modem bridge Debugs bridge filter processing information on a Cisco uBR900 series cable access router. debug cable-modem error Enables debugging messages for the cable interface driver on a Cisco uBR900 series. debug cable-modem interrupts Debugs Cisco uBR900 series interrupts. debug cable-modem mac Troubleshoots the Cisco uBR900 series MAC layer.
debug cable-modem bridge debug cable-modem bridge Use the debug cable-modem bridge command in privileged EXEC mode to debug bridge filter processing information on a Cisco uBR900 series. To turn the debugging messages off, use the no form of this command. [no] debug cable-modem bridge Syntax Description This command has no keywords or arguments. Defaults No default behavior or values. Command Modes Privileged EXEC Command History Release Modification 11.3 NA This command was introduced.
debug cable-modem bridge Related Commands 122 Command Description debug cable-modem bpkm Debugs baseline privacy information on a Cisco uBR900 series. debug cable-modem error Enables debugging messages for the cable interface driver on a Cisco uBR900 series. debug cable-modem interrupts Debugs Cisco uBR900 series interrupts. debug cable-modem mac Troubleshoots the Cisco uBR900 series MAC layer.
debug cable-modem error debug cable-modem error Use the the debug cable-modem error command in privileged EXEC mode to enable debugging messages for the cable interface driver. To turn the debugging messages off, use the no form of this command. [no] debug cable-modem error Syntax Description This command has no keywords or arguments. Defaults No default behavior or values. Command Modes Privileged EXEC Command History Release Modification 11.3 NA This command was introduced.
debug cable-modem error Related Commands 124 Command Description debug cable-modem bpkm Debugs baseline privacy information on a Cisco uBR900 series. debug cable-modem bridge Debugs bridge filter processing information on a Cisco uBR900 series. debug cable-modem interrupts Debugs Cisco uBR900 series interrupts. debug cable-modem mac Troubleshoots the Cisco uBR900 series MAC layer. debug cable-modem map Displays the timing from MAP messages to sync messages and the timing between MAP messages.
debug cable-modem interrupts debug cable-modem interrupts To debug Cisco uBR900 series interrupts, use the debug cable-modem interrupts command in privileged EXEC mode . To turn the debugging messages off, use the no form of this command. [no] debug cable-modem interrupts Syntax Description This command has no keywords or arguments. Defaults No default behavior or values. Command Modes Privileged EXEC Command History Release Modification 11.3 NA This command was introduced.
debug cable-modem interrupts Related Commands 126 Command Description debug cable-modem bpkm Debugs baseline privacy information on a Cisco uBR900 series. debug cable-modem bridge Debugs bridge filter processing information on a Cisco uBR900 series. debug cable-modem error Enables debugging messages for the cable interface driver on a Cisco uBR900 series. debug cable-modem mac Troubleshoots the Cisco uBR900 series MAC layer.
debug cable-modem mac debug cable-modem mac To troubleshoot the Cisco uBR900 series 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 cable-modem mac {log [verbose] | messages} Syntax Description log Realtime MAC log display. verbose (Optional) Displays periodic MAC layer events, such as ranging. messages MAC layer management messages. Defaults No default behavior or values.
debug cable-modem mac 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 since bootup, the log message, and in some cases a parameter that gives more detail about the log entry. uBR924# 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: 528302.044 CMAC_LOG_STATE_CHANGE wait_for_link_up_state *Mar 7 01:42:59: 528302.
debug cable-modem mac 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. This means the log is accurate and reliable. Example 2 The following example compares the output of the debug cable-modem mac log command with the debug cable-modem mac log verbose command. The verbose keyword displays periodic events such as ranging.
debug cable-modem mac In addition, transmitted REG-REQs are displayed in hex dump format. The output from this command is very verbose and is usually not needed for normal interface debugging. The command is most useful when attempting to attach a Cisco uBR900 series cable access router to a CMTS that is not DOCSIS-qualified. For a description of the displayed fields of each message, refer to the DOCSIS Radio Frequency Interface Specification, v1.0 (SP-RFI-I04-980724).
debug cable-modem mac *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar . *Mar *Mar *Mar *Mar *Mar *Mar *Mar *Mar .
debug cable-modem mac Related Commands 132 Command Description debug cable-modem bpkm Debugs baseline privacy information on a Cisco uBR900 series. debug cable-modem bridge Debugs bridge filter processing information on a Cisco uBR900 series. debug cable-modem error Enables debugging messages for the cable interface driver on a Cisco uBR900 series. debug cable-modem interrupts Debugs Cisco uBR900 series interrupts.
debug cable-modem map debug cable-modem map To display the timing from MAP messages to sync messages and the timing between MAP messages on a Cisco uBR900 series cable access router, use the debug cable-modem map command in privileged EXEC mode. To turn the debugging messages off, use the no form of this command. [no] debug cable-modem map Syntax Description This command has no keywords or arguments. Defaults No default behavior or values.
debug cable-modem map Related Commands 134 Command Description debug cable-modem bpkm Debugs baseline privacy information on a Cisco uBR900 series. debug cable-modem bridge Debugs bridge filter processing information on a Cisco uBR900 series. debug cable-modem error Enables debugging messages for the cable interface driver on a Cisco uBR900 series. debug cable-modem interrupts Debugs Cisco uBR900 series interrupts. debug cable-modem mac Troubleshoots the Cisco uBR900 series MAC layer.
Glossary Glossary broadband—Transmission system that combines multiple independent signals onto one cable. In the cable industry, broadband refers to the frequency-division multiplexing of many signals in a wide bandwidth of RF frequencies using a hybrid fiber-coaxial (HFC) network. CATV—Originally stood for Community Antenna Television. Now refers to any coaxial or fiber cable-based system that provides television services.
Glossary headend—Central distribution point for a CATV system. Video signals are received here from satellite (either co-located or remote), frequency converted to the appropriate channels, combined with locally originated signals, and rebroadcast onto the HFC plant. For a CATV data system, the headend is the typical place to create a link between the HFC system and any external data networks. HFC—Hybrid fiber-coaxial (cable network). Older CATV systems were provisioned using only coaxial cable.
Glossary spectrum reuse—CATV’s most fundamental concept. Historically, the over-the-air spectrum has been assigned to many purposes other than that of carrying TV signals. This has resulted in an inadequate supply of spectrum to serve the needs of viewers. Cable can reuse spectrum that is sealed in its aluminum tubes. subscriber unit (SU)—An alternate term for cable access router. See cable access router. upstream—The set of frequencies used to send data from a subscriber to the headend.
Glossary 138 Cisco IOS Release 12.
