Configuring Subscriber-End Broadband Access Router Features This chapter contains procedures for manually configuring basic functionality on the Cisco uBR900 series cable access routers. For detailed descriptions of the commands used, refer to the Cisco IOS Multiservice Applications Command Reference publication.
Configuring Subscriber-End Broadband Access Router Features Subscriber-end Overview Subscriber-end Overview Cisco uBR900 series cable access routers are fully-functional Cisco IOS routers and standards-based bidirectional cable modems that give a residential or small office/home office (SOHO) subscriber high-speed Internet or intranet access and packet telephone services via a shared two-way cable system and IP backbone network.
Configuring Subscriber-End Broadband Access Router Features Cisco IOS Software Feature Sets The following feature sets are available in data and voice versions as well as in data only versions: • Base IP Bridging Feature Set provides full DOCSIS 1.0-compliant cable modem support for users who want a basic high-speed connection to the Internet.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Data Operations This feature set allows the Cisco uBR900 series cable access router great flexibility in administering IP addresses for the PCs and other CPE devices it is connecting to the cable network. The DHCP functionality allows intelligent use of the IP addresses that allow customer premises computers and other equipment to connect to the Internet.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Data Operations Note End-to-end throughput varies based on the design and loading of network components, the mix of traffic, the processing speed and interface of the host server(s), the processing speed and local Ethernet performance of the subscriber computer, and other parameters.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Data Operations The system uses TCP/IP to transmit data. TCP/IP transmits data in segments encased in IP datagrams, along with checksums to detect data corruption and sequence numbers to ensure an ordered byte stream on the TCP connection between the Cisco cable access router and the CMTS. Cisco cable access routers also support multicast services—data streams sent to groups of subscribers.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Data Operations Table 38 Cisco uBR900 Series Cable Access Router Data Specifications (continued) Description Downstream Values Upstream Values Signal-to-Noise Ratio (SNR) 64 QAM: >23.5 dB @ BER<10^8 QPSK: >15 dB @ BER<10^-8 (QPSK will work at 98% successful ping rate for SNR >13 dB. A SNR of 15 dB will be needed to get almost optimal packets per minute transition.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Data Operations Partitioning the upstream plant into smaller segments significantly reduces the number of potential ingress sources and failure points. The CMTS divides the cable plant into downstream channels and upstream segments or clusters of nodes. Downstream and Upstream Data Transfer When operating normally, the Cisco uBR900 series cable access router receives data addressed to it from the CMTS.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Data Operations Figure 111 Cisco uBR900 Series Cable Access Router in a Bridging Configuration PC Ethernet PC CATV coaxial cable Cisco uBR7200 series CMTS Ethernet Cisco uBR900 series cable access router PC Ethernet HFC network 13305 PC or hub Ethernet DOCSIS-compliant transparent bridging is the factory default configuration of the Cisco uBR900 series cable access router.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router 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 112 HFC network L2TP Protocol L2TP is an emerging Internet Engineering Task Force (IETF) standard that combines the best features of two existing tunneling protocols: Cisco Layer 2 Forwarding (L2F) and Microsoft Point-to
Configuring Subscriber-End Broadband Access Router Features Voice over IP Operations Port address translation (PAT) is a similar mechanism that enables all internal hosts to share a single registered IP address (many-to-one translation).
Configuring Subscriber-End Broadband Access Router Features Voice over IP Operations Figure 113 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 You can deploy IP telephony as a local-loop bypass service where voice packets are
Configuring Subscriber-End Broadband Access Router Features Voice over IP Operations • Fax devices—standard Group III and computer-based Group III machines up to 14,400 baud—are supported in Cisco IOS images that support VoIP. • 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.
Configuring Subscriber-End Broadband Access Router Features Voice over IP Operations The Cisco uBR924 cable access router supports the following service classes: • The first CoS in the router 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.
Configuring Subscriber-End Broadband Access Router Features Voice over IP Operations SGCP Protocol Stack The Cisco uBR924 cable access router supports SGCP, an out-of-band signalling protocol that interacts with an external call agent to provide call setup and teardown for VoIP calls made through the Internet or a local intranet.
Configuring Subscriber-End Broadband Access Router Features Voice over IP Operations Table 39 Cisco uBR924 Cable Access Router Voice Specifications (continued) Metric Value 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. <= ±0.5 dB <= ±0.5 dB <= ±1.0dB <= ±3.0 dB Crosstalk <= -65 dBmO Amplitude jitter 20 to 300 Hz 4 to 300 Hz <= 2.5% Peak <= 2.9% Peak Phase jitter 20 to 300 Hz 4 to 300 Hz <= 1.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Security Features 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.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Security Features Triple Data Encryption Standard DES is a standard cryptographic algorithm developed by the United States National Bureau of Standards. The Triple DES (3DES) Cisco IOS software release images increase the security from the standard 56-bit IPSec encryption to 168-bit encryption, which is used for highly sensitive and confidential information such as financial transactions and medical records.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Configuration Options Subscriber-End Broadband Access Router Configuration Options The Cisco uBR900 series cable access router typically ships from the factory ready to work in the Base IP Bridging Feature Set (DOCSIS-compliant bridging) data-only mode.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Configuration Restrictions Using the MAC address of the cable access router as the key, the CMTS downloads the DOCSIS configuration file and Cisco IOS image that will provide the services that you have purchased.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Initial Power-Up Sequence Next, the Cisco uBR900 series performs a series of DOCSIS-mandated procedures for automatic installation and configuration. These procedures are summarized in Table 40 and in Figure 114. . Table 40 Sequence 1.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Initial Power-Up Sequence Table 40 Sequence 4. Cable Access Router Initialization Sequences and Events (continued) Event Description Establish IP connectivity. After the next MAP message broadcast, the router uses a shared require timeslot to invoke DHCP to establish IP connectivity with the TCP/IP network at the headend.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Initial Power-Up Sequence Table 40 Sequence 7. Cable Access Router Initialization Sequences and Events (continued) Event Description Transfer operational parameters. Using TFTP, the router downloads the specified DOCSIS configuration file and configures itself for the appropriate parameters.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Initial Power-Up Sequence Downloading a DOCSIS configuration file to a Cisco uBR900 series cable access router automatically causes the following actions: • Ends all Telnet sessions • Disables the cable access router console port, preventing local access to the CLI • Performs a write-erase on the cable access router local configuration parameters Telnet access to the router from the headend is still all
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Initial Power-Up Sequence Figure 114 Cable Modem Initialization Flowchart Power on 1 2 3 4 5 Scan for downstream channel Establish security Downstream sync established Security established Obtain upstream parameters Transfer operational parameters Upstream parameter acquired Transfer complete Start Ranging Register with the Cisco uBR7246 Ranging and auto adjust completed Registration comple
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Basic Troubleshooting Figure 115 Cisco uBR900 Series Cable Access Router Provisioning Overview CMTS Interface Cisco uBR900 series Cable Access Router MAP Broadcast Contains timesharing info Send UCD Power on Establish synch and wait for UCD Obtain upstream parameters Use temporary SID Extract slot info and upstream channel to use Start ranging Note DHCP Response: Contains IP addresses Default gateway,
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Basic Troubleshooting 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
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Basic Troubleshooting 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.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Basic Troubleshooting 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.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router 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.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Basic Troubleshooting The CMAC_LOG_POWER_LEVEL_IS field is the power level that the CMTS told the Cisco uBR900 series to adjust to. The CMAC_LOG_RANGING_SUCCESS field indicates that the ranging adjustment was successful. 508148.062 508148.064 508148.066 508148.068 508148.070 508148.072 508148.562 508148.566 508148.568 508148.570 508148.572 508148.574 508148.576 508148.578 508148.580 508155.820 508155.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Basic Troubleshooting Event 6—Establish the Time of Day The Cisco uBR900 series accesses the ToD server for the current date and time, which is used to create time stamps for logged events. The CMAC_LOG_TOD_COMPLETE field indicates a successful time of day sequence. 508177.120 508177.126 508177.154 508177.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Configuration Prerequisites Event 10—Comply with Baseline Privacy During this event, keys for baseline privacy are exchanged between the Cisco uBR900 series and the headend CMTS. A link level encryption is performed so that your data cannot be “sniffed” by anyone else on the cable network. Following is a trace showing Baseline Privacy enabled.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Configuration Tasks Note • The CMTS system administrator or appropriate personnel must specify the policy parameters for the Cisco uBR900 series and all computers and other customer premises devices to be supported at subscriber sites. Refer to the Cisco CNR product documentation.
Configuring Subscriber-End Broadband Access Router Features Configuring a Host Name and Password Note • Customizing the Cable Access Router Interface • Using Multiple PCs with the Cable Access Router Before attempting to reconfigure a Cisco uBR900 series cable access router at a subscriber site, contact your network administrator, provisioning manager, or billing system administrator to ensure that remote configuration is allowed.
Configuring Subscriber-End Broadband Access Router Features Configuring Ethernet and Cable Access Router Interfaces Verifying the Host Name and Password To verify that you configured the correct host name and password, perform the following tasks: • Enter the show running-config command in global configuration mode: cisco(config)# show running-config Using 1888 out of 126968 bytes ! version XX.X . . ! hostname cisco ! enable secret 5 $1$60L4$X2JYOwoDc0.
Configuring Subscriber-End Broadband Access Router Features Configuring Routing Command Purpose Step 2 uBR924(config-if)# ip address 172.16.1.1 255.255.255.0 Assigns the appropriate IP address and subnet mask to the interface. Step 3 uBR924(config-if)# Ctrl-Z uBR924# Returns to privileged EXEC mode. %SYS-5-CONFIG_I: Configured from console by console This message is normal and does not indicate an error.
Configuring Subscriber-End Broadband Access Router Features Configuring Routing Command Purpose Step 5 uBR924(config-router)# network network-number Specifies the network connected to the cable access router on which the RIP process will operate. If the cable access router is attached to more than one network, enter each IP address in a separate command. Step 6 uBR924(config-router)# end uBR924(config)# interface cable-modem0 Exits router configuration mode.
Configuring Subscriber-End Broadband Access Router Features Configuring Bridging voice-port 1 ! ! interface Ethernet0 ip address 10.1.0.33 255.255.0.0 no ip directed-broadcast ip rip send version 2 ip rip receive version 2 no keepalive ! interface cable-modem0 ip address 172.16.1.42 255.255.0.0 no ip directed-broadcast ip rip send version 2 ip rip receive version 2 no keepalive cable-modem downstream saved channel 699000000 39 no cable-modem compliant bridge ! router rip network 4.0.0.0 network 172.16.0.
Configuring Subscriber-End Broadband Access Router Features Configuring Bridging Command Purpose Step 7 uBR924(config-if)# bridge-group bridge-group Assigns the Ethernet0 interface to a bridge group. The bridge group must be an integer from 1 to 63. Step 8 uBR924(config-if)# bridge-group bridge-group spanning-disabled Disables spanning tree on the Ethernet interface.
Configuring Subscriber-End Broadband Access Router Features Reestablishing DOCSIS-Compliant Bridging Verifying Bridging To verify that routing has been disabled on all interfaces and that bridging has been reenabled, enter the show startup-config command in privileged EXEC mode: uBR924# show startup-config Building configuration... Current configuration: ! version 12.
Configuring Subscriber-End Broadband Access Router Features Reestablishing DOCSIS-Compliant Bridging After entering this command, perform a warm reset of the Cisco uBR900 series cable access router by pressing and holding down the Reset button for less than 10 seconds. For information on the location and operation of the Reset button, refer to the “Product Overview” chapter of the Cisco uBR924 Hardware Installation Guide.
Configuring Subscriber-End Broadband Access Router Features Customizing the Cable Access Router Interface Customizing the Cable Access Router Interface Different geographical regions and different cable plants use different frequency bands. The Cisco uBR900 series cable access router uses a built-in default frequency scanning feature to address this issue. After the cable access router finds a successful downstream frequency channel, it saves the channel and power setting to NVRAM.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Configuration Examples • Power down the cable access router for approximately one minute and then power it back up so that the PC MAC address will be rediscovered and associated with the cable access router during the normal provisioning process. The PC might also need to be rebooted.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Configuration Examples no ip directed-broadcast no ip route-cache bridge-group 59 bridge-group 59 spanning-disabled ! interface cable-modem0 ip address 172.16.1.40 255.255.0.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Configuration Examples ! router rip version 2 network 4.0.0.0 network 172.16.0.0 ! ip classless no ip http server ! line con 0 transport input none line vty 0 4 ! end IP Multicast Routing Configuration Example The following configuration is for a Cisco uBR900 series that uses PIM sparse-dense mode and belongs to a specific multicast group.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Configuration Examples cable-modem downstream saved channel 477000000 56 no cable-modem compliant bridge ! ! router rip version 2 network 24.0.0.0 network 10.0.0.0 ! ip classless no ip http server ! line con 0 transport input none line vty 0 4 ! end VoIP Bridging Using H.323v2 Configuration Example In this example, the Cisco uBR924 is configured for bridging, with an H.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Configuration Examples no ip route-cache bridge-group 59 bridge-group 59 spanning-disabled ! interface cable-modem0 description DHCP Reserved Address 10.1.71.65 ip address 10.1.71.65 255.255.255.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Configuration Examples ! interface Ethernet0 ip address 24.1.61.1 255.255.255.0 no ip directed-broadcast no ip mroute-cache ! interface cable-modem0 ip address 10.1.71.61 255.255.255.0 no ip directed-broadcast no ip mroute-cache cable-modem downstream saved channel 537000000 27 no cable-modem compliant bridge ! router rip version 2 network 10.0.0.0 network 24.0.0.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Configuration Examples ip classless ip route 0.0.0.0 0.0.0.0 24.3.90.2 access-list 1 permit any ! line con 0 line vty 0 4 login ! end VoIP Bridging Using SGCP Configuration Example 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.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Configuration Examples application SGCPAPP port 1 ! process-max-time 200 ! interface Ethernet0 ip address 188.186.1.14 255.255.0.0 no ip directed-broadcast no ip route-cache no ip mroute-cache bridge-group 59 bridge-group 59 spanning-disabled ! interface cable-modem0 ip address 188.186.1.14 255.255.0.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Configuration Examples hostname Router ! clock timezone - 0 6 ip subnet-zero no ip domain-lookup ! crypto isakmp policy 1 hash md5 authentication pre-share lifetime 5000 crypto isakmp key 1111 address 30.1.1.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Configuration Examples Note Careful address assignment on user equipment and policy routing at the headend is required. The headend may or may not use tunnels to convey traffic back to the corporate gateway. For detailed information on IP security, L2TP, and firewalls, refer to the Cisco IOS Security Configuration Guide.
Configuring Subscriber-End Broadband Access Router Features Subscriber-End Broadband Access Router Configuration Examples line con 0 transport input none line vty 0 4 login ! end Cisco IOS Multiservice Applications Configuration Guide MC-660
