Table Of Contents
Additional Notes for the CVA120 Series
Additional Notes for the Cisco Voice Gateway 200
Additional Notes for the Cisco 800 Series
Cisco uBR905 and uBR925 Series Cable Access Routers
Additional Notes for the Cisco uBR905 Cable Access Router
Additional Notes for the Cisco 1400 Series Routers
Additional Notes for the Cisco 1700 Series Routers
Additional Notes for Cisco IAD2420
Additional Notes for the Cisco 2600 Series Routers
Additional Notes for the Cisco 3600 Series
Cisco MC3810 Multiservice Access Concentrator
Additional Notes for the Cisco MC3810 Multiservice Access Concentrator
Cisco Catalyst 4000 Access Gateway Module
Additional Notes for the Cisco Catalyst 4000 Access Gateway Module
Cisco Catalyst 4224 Access Gateway Switch
Cisco AS5300 Universal Access Servers
Cisco AS5350 Universal Gateways
Cisco AS5400 Universal Gateways
Cisco AS5800 Universal Access Servers
Additional Notes for Cisco 5800 Universal Access Servers
Cisco AS5850 Universal Gateway
Microcode and Modem Code Software
Cisco uBR7200 Series Universal Broadband Routers
Cisco MGX 8850 Route Processor Module
Cisco 15104 Optical Networking System
Feature Support
Cisco IOS software is packaged in feature sets that consist of software images that support specific platforms. The feature sets available for a specific platform depend on which Cisco IOS software images are included in a release. Each feature set contains a specific set of Cisco IOS features.
CautionCisco IOS images with strong encryption (including, but not limited to 168-bit (3DES) data encryption feature sets) are subject to U.S. government export controls and have limited distribution. Strong encryption images to be installed outside the United States are likely to require an export license. Customer orders may be denied or subject to delay because of U.S. government regulations. When applicable, the purchaser/user must obtain local import and use authorizations for all encryption strengths. Please contact your sales representative or distributor for more information, or send an e-mail to export@cisco.com.
The feature set tables have been removed from the Cisco IOS Release 12.2 T release notes to improve the usability of the release notes documentation. The feature-to-image mapping that was provided by the feature set tables is available through Cisco Feature Navigator.
Cisco Feature Navigator is a web-based tool that enables you to determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image. You can search by feature or by feature set (software image). Under the release section, you can compare Cisco IOS software releases side by side to display both the features unique to each software release and the features that the releases have in common.
To access Cisco Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions found at this URL:
http://tools.cisco.com/RPF/register/register.do
Cisco Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Cisco Feature Navigator home page at the following URL:
http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp
For frequently asked questions about Cisco Feature Navigator, see the FAQs at the following URL:
http://www.cisco.com/support/FeatureNav/FNFAQ.html
Determining Which Software Images (Feature Sets) Support a Specific Feature
To determine which software images (feature sets) in Cisco IOS Release 12.2 T support a specific feature, go to the Cisco Feature Navigator home page, enter your Cisco.com login, and perform the following steps.
Step 1
Step 2
Step 3
Note
Repeat this step to add additional features. A maximum of 20 features can be chosen for a single search.
Step 4
Step 5
Step 6
Step 7
Determining Which Features Are Supported in a Specific Software Image (Feature Set)
To determine which features are supported in a specific software image (feature set) in Cisco IOS Release 12.2 T, go to the Cisco Feature Navigator home page, enter your Cisco.com login, and perform the following steps.
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
Memory Recommendations
The memory recommendation tables have been removed from the Cisco IOS Release 12.4 release notes to improve the usability of the release notes documentation. The memory recommendations that were provided by these tables are available through Cisco Feature Navigator.
Cisco Feature Navigator is a web-based tool that enables you to determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image. You can search by feature or by feature set (software image). Under the release section, you can compare Cisco IOS software releases side by side to display both the features unique to each software release and the features that the releases have in common.
To access Cisco Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions found at this URL:
http://tools.cisco.com/RPF/register/register.do
Cisco Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Cisco Feature Navigator home page at the following URL:
For frequently asked questions about Cisco Feature Navigator, see the FAQs at the following URL:
http://tools.cisco.com/ITDIT/CFN/jsp/help.jsp
Determining Memory Recommendations for Software Images (Feature Sets)
To determine memory recommendations for software images (feature sets) in Cisco IOS Release 12.4, go to the Cisco Feature Navigator home page, enter your Cisco.com login, and perform the following steps.
Step 1
Step 2
a.
b.
The Search Results table will list all the software images (feature sets) that support the release that you chose, plus the DRAM and flash memory recommendations for each image.
Step 3
a.
b.
c.
d.
The Search Results table will list all the software images (feature sets) that support the release that you chose, plus the DRAM and flash memory recommendations for each image.
Platform-Specific Information
This section describes the platform-specific information for the Cisco platforms supported by Cisco IOS Release 12.2 T. Each section includes memory requirements and supported features. Additional information is provided when applicable.
This information is provided for the platforms described in the following sections:
•
•
•
•
•
•
•
•
•
•
•
•
•
Cisco SOHO 70 Series Routers
This section contains the following sections with information that is specific to the Cisco SOHO 70 series routers:
Note
Memory Recommendations
For memory recommendations for the Cisco SOHO 70 series routers in Cisco IOS Release 12.2T, refer to the "Memory Recommendations" section.
Supported Hardware
Cisco IOS Release 12.2 T supports the Cisco SOHO 77 and SOHO 78 routers. The Cisco SOHO 77and SOHO 78 routers are small office, home office (SOHO) asymmetric digital subscriber line (ADSL) routers with one Ethernet interface for connection to a service provider network. The routers also provide the following key hardware features:
•
•
•
•
For detailed descriptions of the new hardware features, see the "New and Changed Information" section on page 117.
Table 1 summarizes the interfaces supported on the Cisco SOHO 70 series routers for Cisco IOS Release 12.2 T.
Table 1 Supported Interfaces for the Cisco SOHO Series Routers
SOHO 77
One 10BASE-T (RJ-45)
RJ-11
RJ-45
SOHO 78
One 10BASE-T (RJ-45)
RJ-11
RJ-45
Feature Support
For feature support in Cisco IOS Release 12.2 T, refer to the "Feature Support" section.
Cisco CVA120 Series
This section contains the following sections with information that is specific to the Cisco CVA 120 Series:
•
Introduction
The Cisco CVA120 Series Cable Voice Adapter gives residential subscribers high-speed Internet access. The cable voice adapter supports data traffic via a shared two-way cable system and Internet Protocol (IP) backbone network. The cable voice adapter connects computers and other customer premises devices at a subscriber site to the service provider's cable, hybrid-fiber coax (HFC), and IP backbone network.
The Cisco CVA120 series of cable voice adapters are based on Data-over-Cable Service Interface Specifications (DOCSIS) and European DOCSIS (EuroDOCSIS) standards. Depending on the model, they interoperate with any bidirectional, DOCSIS-qualified or EuroDOCSIS-qualified Cable Modem Termination System (CMTS). The cable voice adapter ships from the Cisco factory with a Cisco IOS software image stored in nonvolatile Flash memory that supports DOCSIS-compliant and EuroDOCSIS-compliant bridging operations.
The cable voice adapter uses its cable interface to connect to the CMTS over the HFC cable system. A personal computer (PC) connects to the cable voice adapter through either the Ethernet or Universal Serial Bus (USB) interface. The cable voice adapter then provides Internet access by forwarding traffic between the PC and the CMTS, creating a high-speed, permanent access to the Internet.
If supported by the service provider, the cable voice adapter can connect to multiple PCs by attaching a PC to each interface (Ethernet and USB). In addition, the cable voice adapter's Ethernet interface can connect to an Ethernet hub, and multiple computers can then be connected to the hub.
Note
In addition to providing DOCSIS/EuroDOCSIS connectivity, the cable voice adapter can optionally provide Voice over IP (VoIP) services, allowing subscribers to make telephone, modem, and fax calls over Transmission Control Protocol (TCP)/IP networks such as the Internet. These calls can be made to other VoIP devices, or to telephone, modem, or fax devices on the regular telephone network (the Public Switched Telephone Network, commonly known as PSTN).
The cable voice adapter can also function as an advanced router, providing wide area network (WAN) data connectivity in a variety of configurations.
Cisco CVA122 Cable Voice Adapter
The Cisco CVA122 Cable Voice Adapter features one F-connector interface to the cable system, one RJ-45 (10BASE-T Ethernet) hub port, one USB device port, and two RJ-11 analog voice ports. The USB interface enables the cable voice adapter to connect to a PC with a USB interface, without having the user to open the unit and install an Ethernet network interface card (NIC). If supported by the PC and service provider, PCs can be connected to the cable voice adapter using both the Ethernet and USB interfaces.
The Cisco CVA122 Cable Voice Adapter supports the DOCSIS standard, which was developed with service providers to ensure that any DOCSIS-certified cable modem can interoperate with any bidirectional, DOCSIS-qualified CMTS. The DOCSIS standard supports the North American National Television Systems Committee (NTSC) channel plan, with 6 MHz channel widths, a downstream range of 88 to 860MHz, and an upstream range of 5 to 42 MHz.
The feature sets available in Release 12.1(5)XU1 for the Cisco CVA122 Cable Voice Adapter include the DOCSIS IP Bridging, IP Routing, and the Easy IP feature sets.
Cisco CVA122E Cable Voice Adapter
The Cisco CVA122E Cable Voice Adapter features one F-connector interface to the cable system, one RJ-45 (10BASE-T Ethernet) hub port, one USB device port, and two RJ-11 analog voice ports. The USB interface enables the cable voice adapter to connect to a PC with a USB interface, without having the user to open the unit and install an Ethernet network interface card (NIC). If supported by the PC and service provider, PCs can be connected to the cable voice adapter using both the Ethernet and USB interfaces.
The Cisco CVA122E Cable Voice Adapter supports the EuroDOCSIS standard, which is almost identical to the DOCSIS standard, except that it supports the European Phase Alternating Line (PAL) and Systeme Electronique Couleur Avec Memoire (SECAM) channel plans, with 8 MHz channel widths, a downstream range of 88 to 860MHz, and an upstream range of 5 to 65 MHz.
The feature sets available in Release 12.1(5)XU1 for the Cisco CVA122E Cable Voice Adapter include the DOCSIS IP Bridging, IP Routing, and the Easy IP feature sets.
Memory Recommendations
For memory recommendations for the Cisco CVA120 cable voice adapter in Cisco IOS Release 12.2T, refer to the "Memory Recommendations" section.
Supported Hardware
The Cisco CVA122 Cable Voice Adapter and Cisco CVA122E Cable Voice Adapter contain the following interfaces:
•
•
•
•
Feature Support
For feature support in Cisco IOS Release 12.2 T refer to the "Feature Support" section.
Additional Notes for the CVA120 Series
Cisco IOS Configuration File Download
The DOCSIS configuration file can contain an optional Vendor-Specific Information Field (VSIF) that instructs the Cisco CVA122 cable voice adapter to download a Cisco IOS configuration file before coming online. In Cisco IOS releases prior to Cisco IOS Release 12.2(4)T, the download of the Cisco IOS configuration file was optional—if the download failed, the cable voice adapter would go online anyway.
Starting with Cisco IOS Release 12.2(4)T, if the DOCSIS configuration file specifies a download of a Cisco IOS configuration file, that download is required—if the download of the Cisco IOS configuration file fails for any reason, the Cisco CVA122 cable voice adapter will reset with the error message "CMAC_LOG_CONFIG_FILE_CISCO_BAD_TYPE" and attempt to reregister again.
Configuring the CMTS Cable Interface When in Routing Mode
If you have configured a Cisco CVA122 Cable Voice Adapter for routing mode and are also using the cable-modem dhcp-proxy nat command on the router, you must configure the corresponding cable interface on the Cisco CMTS with the cable dhcp-giaddr policy command.
Detecting Carrier Sense Errors
The Cisco CVA122 Cable Voice Adapter cannot detect carrier sense errors on the four Ethernet ports that connect the router to the subscriber's local area network. This is because the four Ethernet ports are provided by an internal hub that always provides a carrier sense signal to the Cisco IOS software, even if no Ethernet devices are connected to the external ports.
In particular, this means that the dot3StatsCarrierSenseErrors attribute in ETHERLIKE-MIB (RFC 2665) will never indicate any drops in carrier of the Ethernet interface.
Cisco Voice Gateway 200
This section contains the following sections with information that is specific to the Cisco Voice Gateway 200 (VG200):
•
Introduction
Note
The Cisco VG200 allows customers to connect Cisco IP telephony solution products such as IP phones to the PSTN or to PBX. Analog telephones or fax machines can also be connected. The compact Cisco VG200 chassis with a single 10/100 BASE-T Ethernet port would contain a network module (NM) that provides digital signal processor (DSP) resources, and VICs and/or VWICs, which are used to provide the physical voice interfaces.
A typical configuration includes a NM-2V network module and two VICs. These VICs can be any combination of foreign exchange station (FXS), foreign exchange office (FXO), ear and mouth (E&M), or Basic Rate Interface (BRI) (both user and network sides) for a total of four channels.
In another common configuration of the Cisco VG200, the digital T1/E1 packet voice trunk network module is used. The module can support up to 60 voice channels (two E1 interfaces in a single network module). this packet voice trunk module supports both on- and off-premise connections to PBXs and PSTNs.
With Cisco IOS Release 12.2(13)T, the NM-HDV card can be used to support not only digital voice termination, but also concurrent support for transcoding and conferencing services.
Memory Recommendations
For memory recommendations for the Cisco Voice Gateway 200 in Cisco IOS Release 12.2T, refer to the "Memory Recommendations" section.
Supported Hardware
For detailed descriptions of the new hardware features, see the "New and Changed Information" section on page 117.
Table 2 summarizes the modules and interfaces supported for the Cisco Voice Gateway 200 for Cisco IOS Release 12.2 T.
Feature Support
For feature support in Cisco IOS Release 12.2 T, refer to the "Feature Support" section.
Additional Notes for the Cisco Voice Gateway 200
This section describes additional notes for the Cisco Voice Gateway 200 for Cisco IOS Release 12.2 T.
Handling Incoming Caller ID Digits on an E&M Port
When an H.323 T1-CAS E&M port on the Cisco VG200 is used, incoming caller ID digits may not be processed correctly by Cisco IP interactive voice response (IVR) applications, such as Cisco IP Auto-Attendant.
Depending on the T1-CAS line provisioning, incoming dialed number identification service (DNIS) digits received by the Cisco VG200 after its first wink to the central office (CO) are treated as user-entered digits and are sent to the remote endpoint as out-of-band dual tone multifrequency (DTMF) digits. If the remote endpoint is a Cisco IP IVR application, the out-of-band digits will be interpreted as a user entry and will change the application response. There are two ways to handle this situation:
•
•
Managing Input Gain for Cisco IP Voice Applications
When using the FXO ports on a Cisco VG200, set the input gain greater than 10 to achieve adequate audio quality for use with Cisco IP voice applications or the Cisco IP Phone 7960. Enter the following series of commands from the Cisco IOS command line to set the correct value for input gain:
vg200# configure terminalvg200(config)# voice-port x/x/x input gain <value>Permitted entries for <value> are from -6 to 14. Gain values higher than 12 may cause DTMF recognition difficulties.
Enabling DTMF Relay with MGCP
Ensure that you use the following MGCP configuration command for enabling DTMF relay. If this command is not configured, DTMF tones will be not be regenerated correctly on the remote endpoint. The required command is as follows:
router(config)# mgcp dtmf-relay codec all mode out-of-band
For further information about configuring MGCP, refer to the Software Configuration Guide for the Cisco VG200.
Cisco 800 Series Routers
This section contains the following sections with information that is specific to the Cisco 800 series:
•
Note
Memory Recommendations
For memory recommendations for the Cisco 800 series routers in Cisco IOS Release 12.2T, refer to the "Memory Recommendations" section.
Hardware Supported
Cisco IOS Release 12.2 T supports the following Cisco 800 series routers:
•
•
•
•
•
•
•
•
•
For detailed descriptions of the new hardware features, see the "New and Changed Information" section on page 117.
Table 5 lists the supported interfaces for the Cisco 800 series routers for Cisco IOS Release 12.2 T.
Cisco 801-804 Routers
The Cisco 801-804 routers provide the following key hardware features:
•
•
•
Note
•
•
•
•
Cisco 805 Router
The Cisco 805 router connects small professional offices over serial lines to corporate networks and to the Internet, and provides the following key features:
•
•
•
•
•
•
Cisco 806 Router
The Cisco 806 router provides the following key hardware features:
•
•
•
•
•
•
•
•
•
•
Cisco 827 and Cisco 827-4V Routers
The Cisco 827 and Cisco 827-4V series routers provide the following key hardware features:
•
•
•
•
•
•
•
•
Feature Support
For feature support in Cisco IOS Release 12.2 T, refer to the "Feature Support" section.
Additional Notes for the Cisco 800 Series
caller-id Command
When using the caller-id command, which appears under "dial-peer" in the configuration commands, the default setting is "off" for Japan and "on" for the United States. This command was introduced in Cisco IOS Release 12.1(2)XF.
DHCP Client Support
To configure the router for Dynamic Host Configuration Protocol (DHCP) client support, perform the following steps:
Step 1
Specifying the value client-id ethernet0 causes the MAC address of the Ethernet interface to be used as the client ID when the DHCP request is sent. Otherwise, the MAC address of the BVI is used as the client ID.
Step 2
a.
b.
c.
d.
The following is a sample configuration:
Current configuration:!version 12.0no service padservice timestamps debug uptimeservice timestamps log uptimeno service password-encryption!hostname c827!!ip subnet-zeroip dhcp excluded-address 10.10.10.1!ip dhcp pool SERVERnetwork 10.10.10.0 255.255.255.0default-router 10.10.10.1import all!!!bridge irb!!!!interface Ethernet0ip address 10.10.10.1 255.255.255.0no ip directed-broadcastip nat inside!interface ATM0no ip addressno ip directed-broadcastno atm ilmi-keepalivebundle-enablehold-queue 208 in!interface ATM0.1 point-to-pointno ip directed-broadcastpvc 1/100encapsulation aal5snap!bridge-group 1!interface ATM0.2 point-to-pointip address 5.0.0.2 255.0.0.0no ip directed-broadcastpvc 1/101protocol ip 5.0.0.1 broadcastprotocol ip 5.0.0.5 broadcastencapsulation aal5snap!!interface BVI1ip address dhcp client-id Ethernet0no ip directed-broadcastip nat outside!ip nat inside source list 1 interface BVI 1 overloadip classlessip route 0.0.0.0 0.0.0.0 BVI1no ip http server!access-list 1 permit 10.10.10.0 0.0.0.255bridge 1 protocol ieeebridge 1 route ip!voice-port 1timing hookflash-in 0!voice-port 2timing hookflash-in 0!voice-port 3timing hookflash-in 0!voice-port 4timing hookflash-in 0!!line con 0exec-timeout 0 0transport input nonestopbits 1line vty 0 4password lablogin!scheduler max-task-time 5000endDownloading Images
Delete files in the router Flash memory before attempting to download new images.
Caution
Flash Memory
Cisco 800 series routers use 4 MB of Flash memory for storing internal information such as the ROM monitor. Only the remainder of the Flash memory is available for storing Cisco IOS images and is displayed by using the show flash command. For example, if the router reports 8 MB of Flash, the actual amount of onboard Flash memory is 12 MB, even though only 8 MB are displayed and available for Cisco IOS image storage.
Multilink PPP and Interleaving
Multilink PPP fragments large data packets to allow small voice packets to be interleaved between them. However, apart from FIFO queueing, no other kind of output queueing mechanisms are currently supported with PPP over ATM. Consequently, when multilink PPP is configured on the Cisco 800 series routers, large packets are fragmented, but small voice packets are not interleaved between them.
NAT Support for H.323 Signaling
NAT does not support alerting H.225 messages; therefore, NAT communication cannot be established between router endpoints. NAT support for H.323 signaling is limited to the application NetMeeting.
PPP over AAL5SNAP Encapsulation Support
PPP over AAL5SNAP encapsulation is currently not supported, although the context-sensitive help mentions that it can be configured.
Cisco 800 Series Router Clock—CSCdp09409
To run IP Security (IPSec) successfully, the Cisco 800 series router clock needs to be set accurately. Cisco 800 series router clocks are set and maintained using Simple Network Time Protocol (SNTP). For best results, set up a Network Time Protocol (NTP) server to periodically send time information messages to Cisco 800 series routers. See the SNTP configuration and command reference documentation for configuration instructions. If you do not have an NTP server, you must reset the Cisco 800 series router clock using the clock set command each time you restart the router.
Dial Peer Limitation
The isdn answer1 and isdn answer2 commands determine which called telephone numbers, for example, 555-1111 and 555-2222, a Cisco 800 series router can answer. Using these commands limits a router to using the two dial peers that contain the telephone numbers 555-1111 and 555-2222. (When not using these commands, a router can use up to six dial peers.)
A sample scenario in which the isdn answer1 and isdn answer2 commands are used is when a Cisco 801 or Cisco 803 router is connected with other ISDN devices to an ISDN SBus.
Excessive ISDN Line Activation
The following protocols send updates that can cause an ISDN line to be activated excessively, thereby increasing your monthly ISDN line cost:
•
•
•
•
•
For information on preventing this situation, refer to the Cisco 800 Series Routers Software Configuration Guide. This guide contains information on setting up extended access lists to prevent IP, UDP, IPX, and SNTP updates from activating the ISDN line. For CDP, ensure that you enter the no cdp enable command to disable CDP.
Hanging During Boot
If an illegal console configuration is issued to the router, the console will fail the POST test during boot and cause the router to hang. There is no way to recover a unit in this state except by pulling the soldered boot Flash and reburning the boot ROM.
This problem has been resolved in TinyROM version 1.0(3), a downloadable ROM upgrade available from Cisco.com. Please contact Cisco to upgrade to this version or later, and prevent this problem from occurring.
Phone Mate Answering Machine Model 9200
A Phone Mate answering machine model 9200 failed to recognize the ringing signal sent by AMD R79 ringing SLIC. This failure was confirmed by testing against Phone Mate model 3750 and the newer model 9300.
B-Channel Activation
When a call comes in, a B channel is activated. If the amount of traffic on the B channel exceeds a threshold, the other B channel is activated. If the amount of traffic falls below the threshold, one of the B channels is deactivated. The B channel that is initially activated when the call comes in is not necessarily B1, nor is the B channel that is deactivated when the traffic level lessens necessarily B2.
Cisco uBR905 and uBR925 Series Cable Access Routers
This section contains the following sections with information that is specific to the Cisco uBR905 and uBR925 cable access routers:
•
Introduction
The DOCSIS-based Cisco uBR905 cable access router gives small office, home office (SOHO) and branch office subscribers high-speed Internet or intranet access. The Cisco uBR905 cable access router supports data traffic via a shared two-way cable system and IP backbone network. The Cisco uBR905 cable access router connects computers and other customer premises devices at a subscriber site to the service provider cable, hybrid fiber-coaxial (HFC), and IP backbone network.
The Cisco uBR905 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 uBR905 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 uBR905 cable access router functions as a cable modem at the subscriber site to convey data communications on the cable television system.
Based on the feature licenses your company purchased, other Cisco IOS images can be downloaded from Cisco.com. Special operating modes, based on your service offering and the practices in place for your network, can be supported for the Cisco uBR905 router, based on the available images in Cisco IOS Release 12.2(2)T. The Cisco uBR905 cable access router can also function as an advanced router, providing WAN data connectivity in a variety of configurations.
Note
Cisco uBR905 Cable Access Router
The Cisco uBR905 cable access router features a single F-connector interface to the cable system, four RJ-45 (10BASE-T Ethernet) hub ports, and one RJ-45 console port to connect to a laptop computer/console terminal for local Cisco IOS configuration. The Cisco uBR905 cable access router also provides an onboard IPSec hardware accelerator, which provides high-performance encryption that is substantially faster than software-based encryption.
Memory Recommendations
For memory recommendations for the Cisco uBR905 and uBR925 cable access routers in Cisco IOS Release 12.2T, refer to the "Memory Recommendations" section.
Headend Interoperability
DOCSIS Concatenation
If DOCSIS concatenation with a 16-QAM (quadrature amplitude modulation) symbol rate is used, the CMTS must be configured for Unique Word 16 in the preamble for both short and long data burst profiles. On the Cisco uBR7200 series universal broadband routers, use the cable modulation-profile global configuration command and specify "uw16" for both the long and short modulation profiles.
DOCSIS 1.0+ Extensions
Cisco IOS Release 12.1 XL images support the Cisco DOCSIS 1.0+ Extensions, which include dynamic multi-SID assignment and concatenation. To use the dynamic multi-SID and concatenation features, the Cisco uBR905 router and the CMTS router must support them. If you are using the Cisco uBR7200 series headend equipment as the CMTS router, Cisco IOS Release 12.1(1)T or a later release is required on the CMTS router to ensure that these features are activated.
To configure the Cisco uBR905 cable access router to support multiple classes of service, use either the Cisco Subscriber Registration Center (CSRC) tool or the configuration file editor of your choice. DOCSIS configuration files can contain multiple classes of service (CoS) to support voice and other real-time traffic. The first CoS is used for data (and voice if no other CoS is defined), and up to three additional classes of service can be defined to give higher priority for voice and other real-time traffic.
IPSec Encryption Support
To use IPSec encryption, the Cisco uBR905 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, Cisco PIX Firewall, or other device that can be configured for IPSec. (The CMTS need not support IPSec encryption unless it is desired that the CMTS act as an IPSec gateway.)
Note
Hardware Supported
The Cisco uBR905 cable access router contains the following interfaces:
•
•
–
–
•
•
For detailed descriptions of the new hardware features, see the "New and Changed Information" section on page 117.
Feature Support
For feature support in Cisco IOS Release 12.2 T, refer to the "Feature Support" section.
Limitations and Restrictions
Cisco IOS Release 12.2 T for the Cisco uBR905 cable access router contains the following limitations and restrictions.
Bridging Support
The Cisco uBR905 cable access router interoperates with DOCSIS cable networks. Cisco IOS Release 12.2(1)T does not support bridging traffic across a non-DOCSIS cable network.
DOCSIS CLI Commands are Removed
To comply with DOCSIS requirements that restrict access to commands that change DOCSIS parameters, Cisco IOS Release 12.2(1)T has removed a number of commands from the CLI. The following commands and their no form are now reserved exclusively for DOCSIS use:
•
•
•
•
•
Cisco IOS Configuration File Download
The DOCSIS configuration file can contain an optional Vendor-Specific Information Field (VSIF) that instructs the Cisco uBR905/uBR925 cable access router to download a Cisco IOS configuration file before coming online. In Cisco IOS releases prior to Cisco IOS Release 12.2(4)T, the download of the Cisco IOS configuration file was optional—if the download failed, the router would go online anyway.
Starting with Cisco IOS Release 12.2(4)T, if the DOCSIS configuration file specifies a download of a Cisco IOS configuration file, that download is required—if the download of the Cisco IOS configuration file fails for any reason, the Cisco uBR905/uBR925 cable access router will reset with the error message "CMAC_LOG_CONFIG_FILE_CISCO_BAD_TYPE" and attempt to reregister again.
Detecting Carrier Sense Errors
The Cisco uBR905 and Cisco uBR925 cable access routers cannot detect carrier sense errors on the four Ethernet ports that connect the router to the subscriber's local area network. This is because the four Ethernet ports are provided by an internal hub that always provides a carrier sense signal to the Cisco IOS software, even if no Ethernet devices are connected to the external ports.
In particular, this means that the dot3StatsCarrierSenseErrors attribute in ETHERLIKE-MIB (RFC 2665) will never indicate any drops in carrier of the Ethernet interface.
IP Address Negotiation
The DOCSIS specifications require that a cable modem obtain its IP address at power-on or reset from a DHCP server that is available through the cable interface. For this reason, the cable access router defaults to a configuration that uses the ip address docsis command for the cable interface. It is not possible to override this setting by specifying a static IP address; to assign a static I
Guest
