Table Of Contents
Release Notes for Cisco uBR900 Series for Cisco IOS Release 12.1(6)
Cisco uBR924 Cable Access Router
Cisco uBR904 Cable Access Router
Cisco Cable Clock Card Support
Voice Protocol Support (Cisco uBR924 Router Only)
Cisco uBR924 Cable Access Router
Cisco uBR904 Cable Access Router
Determining the Software Version
Upgrading to a New Software Release
No New Hardware Features in Release 12.1(6)
No New Software Features in Release 12.1(6)
No New Hardware Features in Release 12.1(5)
No New Software Features in Release 12.1(5)
No New Hardware Features in Release 12.1(4)
No New Software Features in Release 12.1(4)
No New Hardware Features in Release 12.1(3)
No New Software Features in Release 12.1(3)
No New Hardware Features in Release 12.1(2)
No New Software Features in Release 12.1(2)
New Hardware Features in Release 12.1(1)
New Software Features in Release 12.1(1)
Management Information Base (MIB) Features
GRE IP Tunnels Are Not Supported
Using Multiple PCs with the Cisco uBR900 Series Cable Access Router
Cisco uBR904 Cable Access Router End of Life
Configuring the Cisco uBR904 Router for Routing Mode
Configuring the Routing Protocol Causes a Reset of the Cable Interface
Downloading a Cisco IOS Configuration File to the Cisco uBR904 Router
Downloading a Cisco IOS Image to the Cisco uBR904 Router
Supplemental and Corrected Text for the Cisco uBR904 Cable Access Router
Supplemental and Corrected Text for the Online Feature Module
For the Cisco uBR924 Cable Access Router
For the Cisco uBR904 Cable Access Router
Cisco Voice MIBs (Cisco uBR924 only)
Radio Frequency Interface MIBs
Troubleshooting uBR Cable Modems Not Coming Online
Closed or Resolved Caveats—Release 12.1(6)
Cisco uBR924 Cable Access Router
Cisco uBR904 Cable Access Router
Cisco IOS Software Documentation Set
Release 12.1 Documentation Set
Obtaining Technical Assistance
Contacting TAC by Using the Cisco TAC Website
Release Notes for Cisco uBR900 Series for Cisco IOS Release 12.1(6)
January 2, 2001
Part Number: OL-0384-06These release notes for the Cisco uBR900 series cable access router support Cisco IOS Release 12.1, up to and including Cisco IOS Release 12.1(6). These release notes are updated as needed to describe new features, memory requirements, hardware support, software deferrals, and changes to the microcode and related documents.
For a list of software caveats that apply to Release 12.1(6), see the "Caveats" section and Caveats for Cisco IOS Release 12.1. The caveats document is updated for every maintenance release and is located on CCO and the Documentation CD-ROM.
Use these release notes with Cross-Platform Release Notes for Cisco IOS Release 12.1 located on Cisco Connection Online (CCO) and the Documentation CD-ROM.
Note
You can find the most current Cisco IOS documentation on Cisco Connection Online (CCO). These electronic documents may contain updates and modifications made after this document was published.
Contents
These release notes describe the following topics:
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Introduction
The DOCSIS-based Cisco uBR900 series cable access routers—Cisco uBR924 and Cisco uBR904—give residential or small office/home office (SOHO) subscribers high-speed Internet or Intranet access. The Cisco uBR924 cable access router also supports both data traffic and packet telephone and fax services using a shared two-way cable system and IP backbone network. The Cisco uBR900 series cable access router connects computers and other customer premises devices at a subscriber site to the service provider's cable, hybrid fiber-coaxial (HFC), and IP backbone network.
The Cisco uBR900 series cable access router is based on Data-over-Cable Service Interface Specifications (DOCSIS) and interoperates with any bidirectional, DOCSIS-qualified cable modem termination system (CMTS). The Cisco uBR900 series cable access router ships from the Cisco factory with a Cisco IOS software image stored in nonvolatile Flash memory that supports DOCSIS-compliant bridging data operations. The Cisco uBR900 series cable access router functions as a cable modem (CM)—a modulator/demodulator at the subscriber site that conveys data communications on the cable television system.
Note
Based on the feature licenses your company purchased, other Cisco IOS images can be downloaded from CCO. Special operating modes, based on your service offering and the practices in place for your network, can be supported for the Cisco uBR900 series router, based on the images available in Cisco IOS Release 12.1(6). The Cisco uBR900 series cable access router can also function as an advanced router, providing wide-area network (WAN) data connectivity in a variety of configurations.
Note
Cisco uBR924 Cable Access Router
The Cisco uBR924 cable access router features a single F-connector interface to the cable system, four RJ-45 (10BaseT Ethernet) hub ports, two RJ-11 Foreign Exchange Station (FXS) voice ports, one RJ-11 port for an optional backup analog telephone line connection, and one RJ-45 console port to connect to a laptop computer/console terminal for local Cisco IOS configuration. The Cisco uBR924 cable access router supports voice and data Cisco IOS software images; available feature sets include Cisco IOS Firewall, Easy IP, Layer 2 Tunneling Protocol (L2TP), and 56-bit and 168-bit IP security (IPSec) encryption.
Cisco uBR904 Cable Access Router
The Cisco uBR904 cable access router features a single F-connector interface to the cable system, four RJ-45 (10BaseT Ethernet) hub ports, and one RJ-45 console port to connect to a laptop computer/console terminal for local Cisco IOS configuration. The Cisco uBR904 cable access router supports data-only Cisco IOS software images; available feature sets include Firewall (Phase I), Easy IP, and 56-bit IPSec.
Note
System Requirements
This section describes the system requirements for Cisco IOS Releases 12.1(6):
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Memory Recommendations
Table 1 lists the memory recommendations for the Cisco IOS Release 12.1 image sets for the Cisco uBR924 cable access router. Table 2 lists the memory recommendations for the Cisco IOS Release 12.1 image sets for the Cisco uBR904 cable access router.
The image subset legend for Table 1Table 1 and Table 2 is as follows:
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Table 1 Memory Recommendations for the Cisco uBR924 Cable Access Router,
Release 12.1(6) Feature Sets
Flash Memory
Recommended
DRAM Memory
Recommended
FromHome Office with Voice—Base image with Easy IP and Voice
ubr920-k1v4y5-mz
4 MB Flash
16 MB DRAM
RAM
Value Telecommuter—Easy IP, Voice, L2TP, and IPSec 56
ubr920-k1sv4y556i-mz
4 MB Flash
16 MB DRAM
RAM
Performance Telecommuter— Easy IP, Voice, L2TP, and IPSec 3DES
ubr920-k1k2sv4y5-mz
4 MB Flash
16 MB DRAM
RAM
Value Small Office—Easy IP, Voice, FW1, L2TP, and IPSec 56
ubr920-k1o3sv4y556i-mz
4 MB Flash
16 MB DRAM
RAM
Performance Small and Branch Office—Easy IP, Voice, FW1 , L2TP, and IPSec 3DES
ubr920-k1k2o3sv4y5-mz
4 MB Flash
16 MB DRAM
RAM
1 FW—Cisco IOS Firewall
Note
Table 2 Memory Recommendations for the Cisco uBR904 Cable Access Router,
Release 12.1(6) Feature Sets
Flash Memory
Recommended
DRAM Memory
Recommended
FromHome Office
ubr900-k1y5-mz
4 MB Flash
8 MB RAM
RAM
Small Office/FW1
ubr900-k1oy5-mz
4 MB Flash
8 MB RAM
RAM
Small Office+/FW1/IPSec 56
ubr900-k1oy556i-mz
4 MB Flash
8 MB RAM
RAM
Telecommuter/IPSec 56
ubr900-k1y556i-mz
4 MB Flash
8 MB RAM
RAM
1 FW—Cisco IOS Firewall
Headend Interoperability
Cisco Cable Clock Card Support
When using Cisco IOS Release 12.1(1) or greater, the Cisco uBR924 cable access router automatically supports the Cisco Cable Clock Card feature for voice traffic when the CMTS is a Cisco uBR7246 VXR universal broadband router with the Cisco Cable Clock Card feature. The Cisco uBR904 cable access router does not support this feature.
IPSec Encryption Support
To use IPSec encryption, both the Cisco uBR900 series cable access router and the destination endpoint must support IPSec encryption and be configured for the same encryption policy. The endpoint is typically an IPSec gateway such as a peer router, PIX Firewall, or other device that can be configured for IPSec. (The CMTS does not need to support IPSec encryption unless it is acting as an IPSec gateway.)
Note
Voice Protocol Support (Cisco uBR924 Router Only)
When using a Cisco IOS Release 12.1 image, the Cisco uBR924 cable access router can packetize and transport voice in compliance with the H.323 protocol. H.323v2 is integrated in Cisco gatekeeper/gateway products, such as the Cisco 2600 series and Cisco 3600 series, using Cisco IOS Release 12.0(5)T or higher images. The gatekeeper must be running Cisco IOS Release 12.0(5)T or higher in order to support registration of the full E.164 address for each Cisco uBR924 cable access router voice port.
The Cisco uBR924 cable access router also supports the Simple Gateway Control Protocol (SGCP) when using Cisco IOS Release 12.1(6) images. SGCP is an alternative to the H.323 protocol that provides signaling and feature negotiation using a remote call agent (CA). SGCP eliminates the need for a dial-plan mapper. It also eliminates the need for static configuration on the router to map IP addresses to telephone numbers because this function is provided by the remote call agent.
Hardware Supported
This section discusses the hardware supported by the Cisco uBR924 and Cisco uBR904 cable access routers.
Cisco uBR924 Cable Access Router
The Cisco uBR924 cable access router contains:
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–
Note
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Cisco uBR904 Cable Access Router
The Cisco uBR904 cable access router contains:
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–
Note
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Determining the Software Version
To determine the version of Cisco IOS software running on your Cisco uBR900 series cable access router, log in to the Cisco uBR900 series cable access router and enter the show version EXEC command.
For the Cisco uBR924 cable access router:
router# show versionCisco Internetwork Operating System SoftwareIOS (tm) 920 Software (ubr920-k1v4y5-mz), Version 12.1(6), RELEASE SOFTWAREFor the Cisco uBR904 cable access router:
router# show versionCisco Internetwork Operating System SoftwareIOS (tm) 900 Software (ubr900-k1y5-mz), Version 12.1(6), RELEASE SOFTWAREUpgrading to a New Software Release
For technical information about upgrading to a new software release, see Cisco IOS Upgrade Ordering Instructions on CCO located at:
http://www.cisco.com/warp/public/620/6.htmlFor other information about upgrading to Cisco IOS Release 12.1, see the product bulletin Cisco IOS Software Release 12.1 Upgrade Paths and Packaging Simplification on CCO at:
Service & Support: Software Center: Cisco IOS Software: Product Bulletins: Software
Under Cisco IOS 12.1, click Cisco IOS Software Release 12.1 Ordering Procedures/Platform SupportFeature Set Tables
Cisco IOS software is packaged in feature sets consisting of software images, depending on the platform. Each feature set contains a specific set of Cisco IOS features.
Caution
Table 3 lists the voice and data software images by feature sets for the Cisco uBR924 cable access router. Table 4 lists the data-only software images by feature sets for the Cisco uBR904 cable access router. These tables use the following conventions:
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Note
Table 3 Feature List by Feature Set for the Cisco uBR924 Cable Access Router—Voice and Data
Baseline Privacy Interface (BPI) Encryption
Yes
Yes
Yes
Yes
Yes
Baseline Privacy Interface (BPI) MIB1
Yes
Yes
Yes
Yes
Yes
Cable Device MIB
Yes
Yes
Yes
Yes
Yes
Cisco IOS Firewall
No
No
No
Yes
Yes
Cisco Standard MIBs
Yes
Yes
Yes
Yes
Yes
Cisco Voice MIBs
Yes
Yes
Yes
Yes
Yes
DOCSIS-Compliant Bridging
Yes
Yes
Yes
Yes
Yes
Easy IP
Yes
Yes
Yes
Yes
Yes
H.323 Protocol
Yes
Yes
Yes
Yes
Yes
IPSec Encryption 56-bit DES
No
Yes
Yes
Yes
Yes
IPSec Encryption Triple DES (3DES)
No
No
Yes
No
Yes
Layer 2 Tunneling Protocol (L2TP)
No
Yes
Yes
Yes
Yes
Radio Frequency Interface MIB
Yes
Yes
Yes
Yes
Yes
Routing (RIP V2)
Yes
Yes
Yes
Yes
Yes
Simple Gateway Control Protocol (SGCP)
Yes
Yes
Yes
Yes
Yes
SGCP MIB
Yes
Yes
Yes
Yes
Yes
1 MIB = Management Information Base
New and Changed Information
This section lists the new hardware and software features supported by the Cisco uBR900 series cable access router.
No New Hardware Features in Release 12.1(6)
Cisco IOS Release 12.1(6) does not contain any new hardware features for the Cisco uBR900 series cable access router.
No New Software Features in Release 12.1(6)
Cisco IOS Release 12.1(6) does not contain any new software features for the Cisco uBR900 series cable access router.
No New Hardware Features in Release 12.1(5)
Cisco IOS Release 12.1(5) does not contain any new hardware features for the Cisco uBR900 series cable access router.
No New Software Features in Release 12.1(5)
Cisco IOS Release 12.1(5) does not contain any new software features for the Cisco uBR900 series cable access router.
No New Hardware Features in Release 12.1(4)
Cisco IOS Release 12.1(4) does not contain any new hardware features for the Cisco uBR900 series cable access router.
No New Software Features in Release 12.1(4)
Cisco IOS Release 12.1(4) does not contain any new software features for the Cisco uBR900 series cable access router.
No New Hardware Features in Release 12.1(3)
Cisco IOS Release 12.1(3) does not contain any new hardware features for the Cisco uBR900 series cable access router.
No New Software Features in Release 12.1(3)
Cisco IOS Release 12.1(3) does not contain any new software features for the Cisco uBR900 series cable access router.
No New Hardware Features in Release 12.1(2)
Cisco IOS Release 12.1(2) does not contain any new hardware features for the Cisco uBR900 series cable access router.
No New Software Features in Release 12.1(2)
Cisco IOS Release 12.1(2) does not contain any new software features for the Cisco uBR900 series cable access router.
New Hardware Features in Release 12.1(1)
The following hardware feature is supported by the Cisco uBR924 router for Release 12.1(1):
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New Software Features in Release 12.1(1)
The following software features are supported by the Cisco uBR900 series cable access router for Release 12.1(1). For more information on these features, see the documentation listed in the "Related Documentation" section.
Software Features
The following new software feature are supported in Cisco IOS Release 12.1(1):
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Management Information Base (MIB) Features
The following MIB features are supported in Cisco IOS Release 12.1(1):
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Limitations and Restrictions
This section describes warnings and cautions about using Cisco IOS Release 12.1(6) software.
Access Lists 100 and 101
Access lists 100 and 101 are reserved for DOCSIS use only and should not be configured for use with IPSec encryption or any other purpose. Access lists that use any other numbers can be used without restriction.
Bridging Support
The Cisco uBR900 series cable access router interoperates with DOCSIS cable networks. Cisco IOS Release 12.1 does not support bridging traffic across a non-DOCSIS cable network.
Debug Commands
All debug commands should be used only when needed for troubleshooting and testing, and then turned off when no longer needed. Each debug display consumes system resources; turning on too many debug commands can negatively affect system performance.
GRE IP Tunnels Are Not Supported
Generic routing encapsulation (GRE) IP tunnels cannot be built between two Cisco uBR900 series cable access routers because GRE IP tunnels are not supported in any Cisco IOS image for the Cisco uBR900 series cable access routers. IPSec tunnels, however, are supported when using Cisco IOS images that support IPSec encryption.
Using Multiple PCs with the Cisco uBR900 Series Cable Access Router
The "MAX CPE" parameter in a Cisco uBR900 series cable access router's DOCSIS configuration file determines how many PCs (or other customer premises equipment [CPE] devices) are supported by the Cisco uBR900 series cable access router when operating in bridging mode. The default value for the "MAX CPE" parameter is 1, which means only one PC can be connected to the Cisco uBR900 series cable access router when operating in bridging mode.
The DOCSIS 1.0 specification states that a CMTS cannot age-out Media Access Control (MAC) addresses for CPE devices, so the first PC that is connected to the Cisco uBR900 series cable access router is normally the only one that the CMTS recognizes as valid. If a subscriber replaces an existing PC or changes its network interface card (NIC) to one that has a different MAC address, the CMTS will refuse to let the PC come online because this would exceed the maximum number of CPE devices specified by the "MAX CPE" parameter. A similar thing would happen if a user decides to move a PC from one Cisco uBR900 series cable access router to another.
To allow a subscriber to replace an existing PC or NIC, the following workarounds are possible:
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Using the Reset Switch
The reset switch on the back panel of the Cisco uBR900 series cable access router is recessed to prevent accidental resets of the router. To depress the switch, use a blunt object, such as a pen or pencil point; do not use a sharp object, such as a knife or awl, because this could damage the switch and the router's circuitry.
Important Notes
This section contains important information about using Cisco IOS Release 12.1(6) software.
Cisco uBR904 Cable Access Router End of Life
The Cisco uBR904 cable access router is an end-of-life (EOL) product, and is no longer available for orders as of October 1999. Software images for the Cisco uBR904 router will continue to be available until November 2000 but will not contain any new feature sets. However, the software images for the Cisco uBR904 router do include the current caveat fixes.
Configuring the Cisco uBR904 Router for Routing Mode
To change the operating mode of the Cisco uBR904 cable access router from its default bridging state, complete the following procedure:
Configuring the Routing Protocol Causes a Reset of the Cable Interface
Be aware that when configuring a routing protocol on an interface, the Cisco IOS software must reset the interface to enable the change. This is normally not a problem on most interfaces, but resetting the cable interface requires the Cisco uBR904 router or Cisco uBR924 router to reinitialize, per the DOCSIS specification.
In particular, when a Cisco IOS configuration file is downloaded to a cable access router, and the file contains a command such as router rip, the cable access router will reset the cable interface when it processes that command, taking the router temporarily offline while it reacquires the cable downstream and upstream channels. This is normal and only slightly delays the cable access router's bootup sequence.
Downloading a Cisco IOS Configuration File to the Cisco uBR904 Router
The vendor-specific information field in the DOCSIS configuration file supports a vendor-defined attribute (type = 43) that lets the system administrator define the name of a Cisco IOS configuration file to download to a remote Cisco uBR904 cable access router. This requires a unique DHCP policy for the Cisco uBR904 cable access router, a unique DOCSIS configuration file to be sent by the DOCSIS process, and a unique Cisco IOS configuration filename—such as "ios.cfg" file—located in the same TFTP server directory supported by the DOCSIS process.
The Cisco uBR904 router automatically downloads the DOCSIS configuration file during initialization. If the DOCSIS configuration file contains the name of a Cisco IOS configuration file, the router automatically downloads that file and processes its Cisco IOS commands. This also automatically disables the router's console port to prevent remote configuration of the router.
Use the following procedure to enter the filename for a Cisco IOS configuration file in the router's DOCSIS configuration file:
Note
Step 1
Step 2
Step 3
Note
Step 4
Note
If using another DOCSIS configuration file editor, enter the following information in the Vendor Specific Information Field (the following uses a file named "ios.cfg"—replace this value with the actual filename being used):
a.
b.
c.
Decimal - Character| 0 NUL| 1 SOH| 2 STX| 3 ETX| 4 EOT| 5 ENQ| 6 ACK| 7 BEL|| 8 BS | 9 HT | 10 NL | 11 VT | 12 NP | 13 CR | 14 SO | 15 SI || 16 DLE| 17 DC1| 18 DC2| 19 DC3| 20 DC4| 21 NAK| 22 SYN| 23 ETB|| 24 CAN| 25 EM | 26 SUB| 27 ESC| 28 FS | 29 GS | 30 RS | 31 US || 32 SP | 33 ! | 34 " | 35 # | 36 $ | 37 % | 38 & | 39 ' || 40 ( | 41 ) | 42 * | 43 + | 44 , | 45 - | 46 . | 47 / || 48 0 | 49 1 | 50 2 | 51 3 | 52 4 | 53 5 | 54 6 | 55 7 || 56 8 | 57 9 | 58 :| 59 ; | 60 < | 61 = | 62 > | 63 ? || 64 @ | 65 A | 66 B | 67 C | 68 D | 69 E | 70 F | 71 G || 72 H | 73 I | 74 J | 75 K | 76 L | 77 M | 78 N | 79 O || 80 P | 81 Q | 82 R | 83 S | 84 T | 85 U | 86 V | 87 W || 88 X | 89 Y | 90 Z | 91 [ | 92 \ | 93 ] | 94 ^ | 95 _ || 96 ` | 97 a | 98 b | 99 c |100 d |101 e |102 f |103 g ||104 h |105 i |106 j |107 k |108 l |109 m |110 n |111 o ||112 p |113 q |114 r |115 s |116 t |117 u |118 v |119 w ||120 x |121 y |122 z |123 { |124 | |125 } |126 ~ |127 DEL|For example, "ios.cfg" converts to the string of decimal digits shown:
i o s . c f g105 111 115 46 99 102 103d.
128.6.105.111.115.46.99.102.103 \e.
Step 5
Step 6
chmod 775 filename1 chmod 775 filename2Step 7
Step 8
clear cable modem x.x.x.x resetThe Cisco uBR904 cable access router reregisters with the CMTS. When it processes the new DOCSIS configuration file, it downloads the new Cisco IOS configuration file from the TFTP server.
The console port of the Cisco uBR904 cable access router is completely disabled.
Disabling the Finger Server
By default, the Cisco uBR900 series cable access router enables its onboard TCP/IP "finger" server to allow remote users to query the number and identities of any users who are logged in to the router. Unless your network operations center (NOC) requires this service, it should be disabled to prevent denial-of-service attacks that access the finger server's well-known port (TCP port 79). To disable the finger server, include the no service finger command in the Cisco IOS configuration file that the router downloads at initial power-on.
Downloading a Cisco IOS Image to the Cisco uBR904 Router
The CMTS system administrator can download an updated Cisco IOS image to a Cisco uBR904 router installed in the field by specifying the updated image filename in the router's DOCSIS configuration file. The Cisco uBR904 router automatically downloads the DOCSIS configuration file during initialization. If the software upgrade option is present in the DOCSIS configuration file and if the name of the Cisco IOS image in the DOCSIS configuration file differs from the image that is currently running on the Cisco uBR904 router, the router automatically downloads the new Cisco IOS image from the Trivial File Transfer Protocol (TFTP) server and reboots.
The image filename must be entered as the fully qualified file and path name for the file, as it exists on a TFTP server. For example, if the ubr900-k1y5-mz software image is available on the TFTP server in the 12.1 directory, enter the following as the filename:
/12.1/ubr900-k1y5-mz
Note
PPP IPCP Enhancements
The PPP IPCP command, which supplies Domain Name System (DNS) or Windows Internet Naming Service (WINS) addresses during IP Control Protocol (IPCP) negotiation, has been enhanced with the reject and accept keywords. These keywords allow enabling or disabling support for the Microsoft IPCP extensions defined by RFC 1877.
Supplemental and Corrected Text for the Cisco uBR904 Cable Access Router
The following is updated information to the Cisco uBR904 Cable Modem Installation and Configuration Guide.
Data transmitted to a Cisco uBR904 cable access router from the CMTS shares a 26- or 27-Mbps, 6-MHz data channel in the 88- to 860-MHz range. The Cisco uBR904 cable access router shares an upstream data rate of up to 10 Mbps on a 200-kHz-wide to 3.2-MHz-wide channel in the 5- to 42-MHz range.
Note
The Cisco uBR904 cable access router supports 64 or 256 quadrature amplitude modulation (QAM) downstream, and Quadrature Phase-Shift Keying (QPSK) or 16-QAM upstream transmission.
Table 5 lists the upstream and downstream data specifications for the Cisco uBR904 cable access router.
Table 5 Cisco uBR904 Cable Access Router Data Specifications
Frequency Range
88 to 860 MHz
5 to 42 MHz
Modulation
64 QAM
256 QAM
QPSK
16 QAM
Data Rate
30 Mbps/64 QAM
(27 Mbit/sec after FEC overhead)42.8 Mbps/256 QAM
(36 Mbit/sec after FEC overhead)QPSK—320 Kbit/sec to 5 Mbit/sec
16 QAM—640 Kbit/sec to 10 Mbit/sec
Bandwidth
6 MHz
200K, 400K, 800K, 1.6M, 3.2 MHz
FEC
RS (122, 128) Trellis
Reed Solomon
One Channel
Receive level of digital signal
-15 to +15 dBmVQPSK— +8 to +58 dBmV
16 QAM— +8 to +55 dBmV
Note
Security
DES decryption: DOCSIS Baseline Privacy (BPI), 40-bit- and 56-bit-encryption, as controlled by the headend and configuration files.
DES encryption.
Note
Signal-to-Noise Ratio (SNR)1
64 QAM:
>23.5 dB @ BER<10^8256 QAM*:
>30 dB @ BER <10^-8
(For input levels between +15 and -8 dBmV, SNR must be greater than 30 dB. For input levels between -8 and -15 dBmV, SNR must be greater than 33 dB.)QPSK:2
>15 dB @ BER<10^-8
(QPSK will work at 98% successful ping rate for SNR>13 dB. An SNR of 15 dB is needed to get almost optimal packets per minute transition.)16 QAM:
>22 dB @ BER <10^-8
(For 16 QAM, an SNR>22 dB creates a grade that is for 98% ping efficiency. To get a good packet rate, you need SNR>25 dB).
1 These performance numbers are in laboratory-controlled conditions, against statistically pure noise sources (AWGN). Because such conditions do not exist in practice, an SNR margin of 6 dB or more is required for reliable operation. Check with your local system guidelines.
2 These measurements were done for 0 and -10 dBmV input to the CMTS, 1280 ksym/sec and 64-byte packet size with a Cisco uBR904 cable access router and laboratory-controlled conditions.
DOCSIS configuration files typically are created at the headend by using a configuration file editor of your choice. Using the FastStep utility at a subscriber site to locally configure the unit is not supported.
The DOCSIS configuration file defines the Cisco uBR904 cable access router's operating mode, such as the provisioned downstream and upstream service assignments, including assigned frequencies, data rates, modulation schemes, class of service (CoS), type of services to support, and other parameters.
Note
The Cisco uBR904 cable access router supports the following service classes:
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This service class assigns a primary Service ID (SID) for the unit. In addition to being used as a data SID, the router uses this SID for all MAC message exchanges with the CMTS. Any Simple Network Management Protocol (SNMP) management traffic from the network to the Cisco uBR904 cable access router also uses this SID.
While this class is strictly "best effort," you can prioritize data traffic within this class into eight different priority levels.
Note
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Supplemental and Corrected Text for the Online Feature Module
For the Cisco uBR924 Cable Access Router
Troubleshooting Tips for the Cisco uBR924 Cable Access Router, page 15, indicates:
"Some CATV systems use alternative frequency plans such as the IRC (Incrementally Related Carrier) and HRC (Harmonically Related Carrier) plans. Most of the IRC channel slots overlap the EIA plan. The HRC plan is not supported by Cisco's cable access routers since so few cable plants are using this plan."
The correction should read:
"For the Cisco uBR924 cable access router, both the Incrementally Related Carrier (IRC) and Harmonically Related Carrier (HRC) plans are supported. Most of the IRC channel slots overlap the EIA plan.
"The list of downstream search bands added for HRC have appropriate center frequencies and step values for an HRC channel plan. The expanded search band list might increase the time required by the Cisco uBR924 cable access router to acquire the downstream signal on the HRC channel plan, which can add to the total time for complete registration of the modem the first time it is added to the cable system."
Note
For the Cisco uBR904 Cable Access Router
Troubleshooting Tips for the Cisco uBR904 Cable Modem, page 11, indicates:
"Some CATV systems use alternative frequency plans such as the IRC (Incrementally Related Carrier) and HRC (Harmonically Related Carrier) plans. Most of the IRC channel slots overlap the EIA plan. The HRC plan is not supported by Cisco's cable modems since so few cable plants are using this plan."
The correction should read:
"For the Cisco uBR904 cable access router, both the Incrementally Related Carrier (IRC) and Harmonically Related Carrier (HRC) plans are supported. Most of the IRC channel slots overlap the EIA plan.
"The list of downstream search bands added for HRC have appropriate center frequencies and step values for an HRC channel plan. The expanded search band list might increase the time required by the Cisco uBR904 cable access router to acquire the downstream signal on the HRC channel plan, which can add to the total time for complete registration of the Cisco uBR904 cable access router the first time it is added to the cable system."
Supported MIBs
The Cisco uBR900 series cable access router supports the following categories of Management Information Bases (MIBs):
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Cable Device MIBs
For the Cisco uBR900 series cable access router, the Cable Device MIB is supported. The Cable Device MIB is for DOCSIS-compliant cable modems and CMTS. The Cable Device MIB records statistics related to the configuration and status of the cable modem. Statistics include an events log and device status. The following list details the components of the Cable Device MIB:
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The Cable Device MIB is very similar to the RFI MIB in that both allow access to statistics. However, the Cable Device MIB reports statistics on the cable modem, while the RFI MIB reports statistics on the radio frequency transmissions over the cable television line.
Cisco Standard MIBs
For the Cisco uBR900 series cable access router, the Cisco Standard MIBs are supported. The Cisco Standard MIBs consist of the following components:
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Cisco Voice MIBs (Cisco uBR924 only)
The Cisco Voice MIBs are supported only on the Cisco uBR924 cable access router. The Cisco Voice MIBs consist of the following components:
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Radio Frequency Interface MIBs
For the Cisco uBR900 series cable access router, the Radio Frequency Interface (RFI) MIB is supported. The RFI MIB module is for DOCSIS-compliant radio frequency interfaces in cable modems and CMTS. On the cable modem, RFI MIB entries provide:
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The RFI MIB includes tables describing both the CMTS and the cable modem side of the cable interface. All cable modem tables are implemented.
With IPSec, data can be transmitted across a public network without fear of observation, modification, or spoofing. This enables applications such as VPNs, extranets, and remote user access.
IPSec services are similar to those provided by Cisco Encryption Technology, a proprietary Cisco security solution. However, IPSec provides a more robust security solution, and is standards based.
SGCP MIBs (Cisco uBR924 only)
The Simple Gateway Control Protocol (SGCP) Management Information Bases (MIBs) are supported only on the Cisco uBR924 cable access router. The SGCP MIBs support configuration, performance, and fault management of the SGCP interface. The SGCP MIBs components are as follows:
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Cable-Specific MIBs
Table 6 shows the cable-specific MIBs that are supported on the Cisco uBR900 series cable access router. This table also provides a brief description of each MIB's contents and the Cisco IOS software release in which the MIB was initially functional—earlier releases might have had unsupported prototype versions of the MIB; later releases might have added new attributes and functionality.
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Deprecated MIBs
A number of Cisco-provided MIBs have been replaced with more scalable, standardized MIBs; these MIBs have filenames that start with "OLD" and first appeared in Cisco IOS Release 10.2. The functionality of these MIBs has already been incorporated into replacement MIBs, but the old MIBs are still present to support existing Cisco IOS products or network management system (NMS) applications. However, because the deprecated MIBs will be removed from support in the future, you should update your network management applications and scripts to refer to the table names and attributes that are found in the replacement MIBs.
Table 7 shows the deprecated MIBs and their replacements. In most cases, SNMPv1 and SNMPv2 replacements are available, but some MIBs are available only in one version. A few of the deprecated MIBs do not have replacement MIBs; support for these MIBs will be discontinued in a future release of Cisco IOS software.
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Troubleshooting uBR Cable Modems Not Coming Online
The tech note Troubleshooting uBR Cable Modems Not Coming Online is available on CCO:
http://www-tac.cisco.com/Teams/esupport/Cable/troubleshooting_cm_online_from_ac.html
This tech note discusses the different states that CMs go through before coming online and establishing IP connectivity. The tech note highlights the most commonly used IOS troubleshooting commands to verify what state the CM is in and the reasons that can cause the modem to arrive at that state. This is illustrated by debugs and show commands at both the CMTS and the CM. The tech note also discusses some of steps that can be taken to arrive at the correct status, online.
Caveats
Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats; severity 2 caveats are less serious. Severity 3 caveats are moderate caveats, and only select severity 3 caveats are included in the caveats document.
For information on caveats in Cisco IOS Release 12.1, see Caveats for Cisco IOS Release 12.1, which lists severity 1 and 2 caveats and select severity 3 caveats for Cisco IOS Release 12.1 and is located on CCO and the Documentation CD-ROM.
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Open Caveats—Release 12.1(6)
All the caveats listed in this section are open in Release 12.1(6).
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The Cisco uBR924 cable access router, when running the NAT and firewall features, crashes if establishing roughly 150 Telnet sessions (using the solaris_telnet client). The workaround is to avoid creating that many Telnet sessions.
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The Cisco uBR904 cable access router can stop responding to CMTS requests when upstreams are configured with different minislot sizes. The workaround is to configure the upstreams with the same minislot size.
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When running Cisco IOS Release 11.3(11) NA, the Cisco uBR900 series cable access router does not come up when all four downstreams are combined through the upconverter and all of the upstreams of the four cards are combined. When the Cisco uBR900 series router is instructed to go to a different downstream, it obtains the correct IP address for the new downstream, but fails to update the default gateway according to the DHCP reply; it subsequently fails to obtain the time-of-day (TOD) or to download the DOCSIS configuration file. The default gateway address must be corrected manually before the router succeeds in obtaining the configuration file and in getting the current time-of-day.
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The voice-port cptone command does not support the set of telephony tones used in the Czech Republic or in Switzerland. There is no workaround.
Closed or Resolved Caveats—Release 12.1(6)
All the caveats listed in this section are closed or resolved in Release 12.1(6).
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Previously, the Cisco uBR900 series cable access router would age-out a CPE device's MAC address after one week of inactivity. This behavior did not conform to the DOCSIS specification, which prohibits aging out of CPE devices.
This is resolved in Cisco IOS Release 12.1(1), so that CPE devices are no longer aged out.
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These caveats improve the Cisco uBR924 cable access router's error handling when it does not receive a valid response from the time-of-day (ToD) server during its power-on provisioning; an error message is also displayed when a ToD failure occurs. These caveats also add support for using multiple ToD servers when the DHCP server returns a list of two or more ToD servers.
This caveat is resolved in Cisco IOS Release 12.1(1).
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Cisco IOS Release 12.1(2) updates the Cisco uBR924 cable access router so that the "docsDevCpeIpMax" attribute defaults to -1, which allows any number of CPE devices to access the cable network through the Cisco uBR924 cable access router.
This caveat is resolved in Cisco IOS Release 12.1(2).
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The Cisco uBR900 series cable access router could not upgrade its software image if the fully-qualified filename for the new image was longer than 48 characters. The workaround was to rename the image with a shorter filename or to move it higher in the TFTP server's directory structure so that the fully-qualified pathname was shorter than 48 characters.
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The Cisco uBR900 series cable access router could crash with an exception if the debug all command is given to turn on all debugging statements. This caveat was closed because the problem cannot be reproduced in production software images.
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This is resolved in Cisco IOS Release 12.1(1).
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The Cisco uBR924 cable access router, when running the Small Office feature set, could crash (with an exception) when changing the running configuration. The crash occurred when using a specific configuration designed for test networks and was unlikely to occur when using configurations for real-life networks.
This is resolved in Cisco IOS Release 12.1(2).
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This caveat described a problem with GRE IP tunnels that were built between two Cisco uBR900 series cable access routers, using BPI encryption. The resulting tunnels experienced intermittent operation, going down after a few minutes of use. Tunnels built using IPSec encryption were successfully used.
This caveat was closed without modification because GRE tunnels are not currently supported on any software image for the Cisco uBR900 series cable access routers. IPSec tunnels, however, are supported when using Cisco IOS images that support IPSec encryption.
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When two Cisco uBR924 cable access routers have established a working voice call, a particular situation might prevent the two routers from establishing any additional voice calls. The workaround is to reload each router before making additional voice calls.
This is resolved in Cisco IOS Release 12.1(2).
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A defect could cause a Cisco router to crash and hang when the Cisco web server was enabled with the ip http server command and a browser connects to http://<router-ip>/%%. The defect could be exploited to produce a denial of service (DoS) attack. This fact was announced on public Internet mailing lists which are widely read both by security professionals and by security "crackers", and should be considered public information.
The workaround to this defect was to disable the Cisco web server with the no ip http server command.
Alternatively, the administrator could choose to block port 80 connections to the router via access lists or other firewall methods. For further information, a Security Advisory will be posted to http://www.cisco.com/warp/public/707/advisory.html.
This caveat is resolved in Cisco IOS Release 12.1(2).
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A defect in multiple releases of Cisco IOS software will cause a Cisco router or switch to halt and reload if the Cisco IOS HTTP service is enabled, browsing to http://router-ip/anytext?/ is attempted, and the enable password is supplied when requested. This defect can be exploited to produce a denial of service (DoS) attack.
The vulnerability, identified as Cisco bug ID CSCdr91706, affects virtually all mainstream Cisco routers and switches running Cisco IOS software releases 12.0 through 12.1, inclusive. This is not the same defect as CSCdr36952.
The vulnerability has been corrected and Cisco is making fixed releases available for free to replace all affected Cisco IOS releases. Customers are urged to upgrade to releases that are not vulnerable to this defect as shown in detail below.
This vulnerability can only be exploited if the enable password is known or not set.
You are strongly encouraged to read the complete advisory, which is available at http://www.cisco.com/warp/public/707/ioshttpserverquery-pub.shtml.
This caveat is resolved in Cisco IOS Release 12.1(5).
Related Documentation
The following sections describe the documentation available for the Cisco uBR900 series cable access router. These documents consist of hardware and software installation guides, Cisco IOS configuration and command references, system error messages, feature modules, and other documents.
Most documentation is available as printed manuals or electronic documents, except for feature modules and select manuals, which are available online on CCO and the Documentation CD-ROM.
Use these release notes with these documents:
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Release-Specific Documents
The following documents are specific to Release 12.1 and are located on CCO and the Documentation CD-ROM:
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On CCO at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Release Notes: Cross-Platform Release Notes
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Technical Documents
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As a supplement to the caveats listed in these release notes, see Caveats for Cisco IOS Release 12.1, which contains caveats applicable to all platforms for all maintenance releases of Release 12.1.
On CCO at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Caveats
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS 12.1: Caveats
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Platform-Specific Documents
Cisco uBR924 Cable Access Router
These documents are available for the Cisco uBR924 cable access router on CCO and the Documentation DC-ROM:
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On CCO at:
Technical Documents: Documentation Home Page: Cisco Product Documentation: Broadband/Cable Solutions: Cisco uBR900 Series Cable Access Routers
On the Documentation CD-ROM at:
Cisco Product Documentation: Broadband/Cable Solutions: Cisco uBR900 Series Cable Access Routers
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Cisco uBR904 Cable Access Router
These documents are available for the Cisco uBR904 cable access router on CCO and the Documentation CD-ROM:
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On CCO at:
Technical Documents: Documentation Home Page: Cisco Product Documentation: Broadband/Cable Solutions: Cisco uBR900 Series Cable Access Routers
On the Documentation CD-ROM at:
Cisco Product Documentation: Broadband/Cable Solutions: Cisco uBR900 Series Cable Access Routers
Feature Modules
Feature modules describe new features supported by Release 12.1, and are updates to the Cisco IOS documentation set. A feature module consists of a brief overview of the feature, benefits, configuration tasks, and a command reference. As updates, the feature modules are available online only. Feature module information is incorporated in the next printing of the Cisco IOS documentation set.
On CCO at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1: New Feature Documentation
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1: New Feature Documentation
Cisco IOS Software Documentation Set
The Cisco IOS software documentation set consists of the Cisco IOS configuration guides, Cisco IOS command references, and several other supporting documents that are available in electronic form on the Documentation CD-ROM and CCO and in printed form on request.
Documentation Modules
Each module in the Cisco IOS documentation set consists of two books: a configuration guide and a corresponding command reference. Chapters in a configuration guide describe protocols, configuration tasks, and Cisco IOS software functionality, and contain comprehensive configuration examples. Chapters in a command reference provide complete command syntax information. Use each configuration guide with its corresponding command reference.
On CCO and the Documentation CD-ROM, two master hot-linked documents provide information for the Cisco IOS software documentation set.
On CCO at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Configuration Guides and Command References
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Configuration Guides and Command References
Release 12.1 Documentation Set
Table 8 describes the contents of the Cisco IOS Release 12.1 software documentation set, which is available in electronic form and in printed form upon request.
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On CCO at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1
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Obtaining Documentation
The following sections provide sources for obtaining documentation from Cisco Systems.
World Wide Web
You can access the most current Cisco documentation on the World Wide Web at http://www.cisco.com. Translated documentation can be accessed at http://www.cisco.com/public/countries_languages.shtml.
Documentation CD-ROM
Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM is updated monthly and may be more current than printed documentation. The CD-ROM package is available as a single unit or as an annual subscription.
Ordering Documentation
Cisco documentation is available in the following ways:
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http://www.cisco.com/cgi-bin/order/order_root.pl
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http://www.cisco.com/go/subscription
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Documentation Feedback
If you are reading Cisco product documentation on the World Wide Web, you can submit technical comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco.
You can e-mail your comments to bug-doc@cisco.com.
To submit your comments by mail, for your convenience many documents contain a response card behind the front cover. Otherwise, you can mail your comments to the following address:
Cisco Systems, Inc.
Document Resource Connection
170 West Tasman Drive
San Jose, CA 95134-9883We appreciate your comments.
Obtaining Technical Assistance
Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools. For Cisco.com registered users, additional troubleshooting tools are available from the TAC website.
Cisco.com
Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information and resources at anytime, from anywhere in the world. This highly integrated Internet application is a powerful, easy-to-use tool for doing business with Cisco.
Cisco.com provides a broad range of features and services to help customers and partners streamline business processes and improve productivity. Through Cisco.com, you can find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online technical support, download and test software packages, and order Cisco learning materials and merchandise. Valuable online skill assessment, training, and certification programs are also available.
Customers and partners can self-register on Cisco.com to obtain additional personalized information and services. Registered users can order products, check on the status of an order, access technical support, and view benefits specific to their relationships with Cisco.
To access Cisco.com, go to the following website:
http://www.cisco.com
Technical Assistance Center
The Cisco TAC website is available to all customers who need technical assistance with a Cisco product or technology that is under warranty or covered by a maintenance contract.
Contacting TAC by Using the Cisco TAC Website
If you have a priority level 3 (P3) or priority level 4 (P4) problem, contact TAC by going to the TAC website:
http://www.cisco.com/tac
P3 and P4 level problems are defined as follows:
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In each of the above cases, use the Cisco TAC website to quickly find answers to your questions.
To register for Cisco.com, go to the following website:
http://www.cisco.com/register/
If you cannot resolve your technical issue by using the TAC online resources, Cisco.com registered users can open a case online by using the TAC Case Open tool at the following website:
http://www.cisco.com/tac/caseopen
Contacting TAC by Telephone
If you have a priority level 1(P1) or priority level 2 (P2) problem, contact TAC by telephone and immediately open a case. To obtain a directory of toll-free numbers for your country, go to the following website:
http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml
P1 and P2 level problems are defined as follows:
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Guest
