|
|
April 17, 2000
 |
Note You can find the most current Cisco IOS documentation, including release notes, on Cisco Connection Online (CCO). These electronic documents may contain updates and modifications made after the hard copy documents were printed. |
These release notes describe features and caveats in Cisco IOS Release 12.0(8)DA4 for the Cisco 6260 and Cisco 6130 digital subscriber line (DSL) access multiplexers (DSLAMs).
For pointers to more information about the Cisco 6260, the Cisco 6130, and their software, refer to the "Related Documentation" section. To learn more about caveats, visit Cisco's web site—see the "Cisco Connection Online" section for details. Information about electronic documentation can be found in both the "Cisco Connection Online" section and in the "Documentation CD-ROM" section.
This document discusses the following topics:
Cisco IOS Releases 12.0(8)DA4, 12.0(8)DA3, 12.0(8)DA2, 12.0(8)DA1 and 12.0(5)DA1 run on these DSLAM systems:
Cisco IOS Release 12.0(5)DA runs on all Cisco 6260 systems.
This section describes new features.
There are no new features in Cisco IOS Release 12.0(8)DA4. This is a maintenance release designed to improve the reliability and performance of the Cisco DSLAMs.
A new command, payload-scrambling, has been added in profile configuration mode.
To enable ATM cell payload scrambling on a DMT subscriber port, use the payload-scrambling profile configuration command. To disable payload scrambling, use the no form of the command.
payload-scrambling
no payload-scrambling
Payload scrambling is enabled by default.
The two ends of a connection must have the same payload scrambling value—that is, payload scrambling must be enabled at both ends or disabled at both ends. The line does not pass valid data if payload scrambling is enabled at one end and disabled at the other.
Enabling or disabling payload scrambling does not untrain or retrain a port.
Use the show dsl profile command to display the status of payload scrambling for a profile.
In this example, payload scrambling is disabled for the default DSL profile:
DSLAM# conf t
DSLAM(config)# dsl-profile default
DSLAM(cfg-dsl-prof)# no payload-scrambling
When you boot the DSLAM for the first time after installing Cisco IOS Release 12.0(8)DA3, the DSLAM downloads new microcode to the ATUC-1-4DMT line cards. The microcode download time has been reduced to 10 minutes. (Download time was about 35 minutes in the previous release.)
See the "New Feature in Release 12.0(8)DA2" section for more information on the microcode download.
Cisco IOS Release 12.0(8)DA2 supports SST flash on revision 800-05262-03 of the ATUC-1-4DMT line card for Cisco 6260 and Cisco 6130 DSLAMs. If you install the new line card, you must also install this new software so that the DSLAM can recognize the line card.
 |
Caution When you boot the DSLAM for the first time after installing Cisco IOS Release 12.0(8)DA2, the DSLAM downloads new microcode to the line cards. The microcode download takes about 35 minutes. During the download period, the Active LED on each line card blinks and the DSLAM does not pass data. Until the download is complete, do not remove cards from the chassis. Do not reboot the chassis. If you interrupt the download, the line card's flash memory might be damaged, making it necessary to replace the card. When the download is complete, the Active LEDs on the line cards stop blinking and the lines train as usual. |
You can track the status of a microcode download through software using the command show dsl int atm slot/port. In the resulting display, look at the Line Status field. If the Line Status field says DOWNLOADING MICROCODE, wait a few minutes and check again.
Cisco IOS Release 12.0(8)DA2 runs on both the Cisco 6260 and the new Cisco 6130. The Cisco 6130 is described in the section "New Features in Release 12.0(5)DA1." For a description of the Cisco 6260, see the "New Features in Release 12.0(5)DA" section.
Cisco IOS Release 12.0(8)DA1 includes support for DS-3 trunk and subtending interfaces on both the Cisco 6130 and the Cisco 6260.
Cisco IOS Release 12.0(8)DA1 runs on both the Cisco 6260 and the new Cisco 6130. The Cisco 6130 is described in the section "New Features in Release 12.0(5)DA1." For a description of the Cisco 6260, see the "New Features in Release 12.0(5)DA" section.
The Cisco 6130 is a multiservice DSLAM designed for markets in North America and for worldwide multitenant dwelling unit (MDU) service provider markets. The Cisco 6130 is a NEBS-compliant platform that supports up to 128 discrete multitone (DMT) T1.413-1998 Issue 2-compliant modems per chassis; up to 13 Cisco 6130 chassis can be linked together through the use of advanced, fair-service subtending. (Higher port concentrations are planned for future releases.) OC-3c trunk/subtending interfaces are available immediately, and DS-3 interfaces will be available shortly. The Cisco 6130 also includes optional support for analog voice telephony (POTS, or plain old telephone service) through a companion POTS splitter available from Siecor or RSX. The Cisco 6130 runs the widely deployed Cisco IOS software.
The Cisco 6130 is designed for 23-inch deployments requiring NEBS compliance and compatibility with international telephone network requirements. Cisco technical and customer service support teams ensure the highest level of customer care and service support available.
The Cisco 6130 internal design is based on a high-performance ATM switching architecture that includes more than 1 million cells of buffering, support for multiple ATM quality of service (QoS) levels, and a variety of ATM traffic management and shaping capabilities.
The Cisco 6130 supports subtending of up to 13 shelves (chassis) of user traffic all concentrated onto a single network WAN interface port. A variety of WAN and subtending interface port configurations are available, allowing for flexible service architecture design and optimized cost. The Cisco 6130 subtending architecture provides fair and prioritized access to network bandwidth for all subscriber traffic, ensuring sustained throughput and performance for all users.
The Cisco 6130 supports a four-port DMT T1.413-1998 Issue 2-compliant line card and up to 128 ports per shelf. Other DSL line card options are planned for the future.
Support for ITU and ATM Forum UNI 3.0, 3.1, and 4.0 SVCs provides end-user applications with real-time access to bandwidth and QoS. Support for Private Network Node Interface (PNNI) call routing and Call Admission Control (CAC) is also included.
ATM signaling can be used for automated provisioning of ATM virtual circuits. This capability, also referred to as soft PVCs, greatly reduces the time and cost of manual, node-by-node PVC provisioning.
Optional support for voice telephone service (POTS) is available through use of POTS splitter equipment available from a third party (Siecor or RSX). This POTS splitter solution is optimized for international copper access networks and is designed to ensure that basic telephone service is always available, a feature known as life-line POTS. The Siecor product is the ADSL POTS splitter rack-mount shelf, central office version. These are the Siecor part numbers:
These cable kits for the POTS splitter are available from both Siecor/RSX and from Cisco. The Cisco part numbers are provided:
Use these contacts to get more product information on this POTS solution:
The Cisco DSL Manager (CDM) provides comprehensive Cisco 6130 element management and operations support based on standard Simple Network Management Protocol (SNMP) technology. Additionally, if you use standards-based network management interfaces and protocols, the CDM can be directly integrated with other Cisco or customer-provided operations management systems for delivery of integrated, end-to-end service management solutions.
Cisco IOS Release 12.0(5)DA runs on the Cisco 6260. The Cisco 6260 is a multiservice DSLAM designed for markets in Asia/Pacific, Europe, the Middle East, Africa, South/Central America, and Mexico, and for customers including post, telephone and telegraph agencies (PTTs) and competitive local exchange carriers (CLECs). The Cisco 6260 is also designed for worldwide multitenant dwelling unit (MDU) service provider markets, including those in North America. The Cisco 6260 is an ETSI-compliant platform that supports up to 120 discrete multitone (DMT) T1.413-1998 Issue 2-compliant modems per chassis; up to 13 Cisco 6260 chassis can be linked together through the use of advanced, fair-service subtending. (Higher port concentrations are planned for future releases.) The Cisco 6260 also includes optional support for analog voice telephony (POTS) through a companion POTS splitter available from Siecor or RSX. The Cisco 6260 runs the widely deployed Cisco IOS software.
The Cisco 6260 is designed for worldwide markets requiring ETSI compliance and compatibility with international telephone network requirements. Cisco technical and customer service support teams are regionally deployed around the world to ensure the highest level of customer care and service support available.
The Cisco 6260 is designed for ETS-300 and/or 19-inch deployments. Interface cabling and wiring are 100 percent front-access, making the product ideal for the back-to-back or flush-to-wall installations often found in MDU environments.
The Cisco 6260 internal design is based on a high-performance ATM switching architecture that includes more than 1 million cells of buffering, support for multiple ATM quality of service (QoS) levels, and a variety of ATM traffic management and shaping capabilities.
The Cisco 6260 supports subtending of up to 13 shelves (chassis) of user traffic all concentrated onto a single network WAN interface port. A variety of WAN and subtending interface port configurations are available, allowing for flexible service architecture design and optimized cost. The Cisco 6260 subtending architecture provides fair and prioritized access to network bandwidth for all subscriber traffic, ensuring sustained throughput and performance for all users.
The Cisco 6260 supports a four-port DMT T1.413-1998 Issue 2-compliant line card and up to 120 ports per shelf. Other DSL line card options are planned for the future.
Support for ITU and ATM Forum UNI 3.0, 3.1, and 4.0 SVCs provides end-user applications with real-time access to bandwidth and QoS. Support for PNNI call routing and Call Admission Control (CAC) is also included.
ATM signaling can be used for automated provisioning of ATM virtual circuits. This capability, also referred to as soft PVCs, greatly reduces the time and cost of manual, node-by-node PVC provisioning.
Optional support for voice telephone service (POTS) is available through the use of POTS splitter equipment available from a third party (Siecor or RSX). The recommended POTS splitter solution is optimized for international copper access networks and is designed to ensure that basic telephone service is always available, a feature known as life-line POTS. These are the Siecor part numbers:
Use these contacts to get more product information on this POTS solution:
The Cisco DSL Manager (CDM) provides comprehensive Cisco 6260 element management and operations support based on standard Simple Network Management Protocol (SNMP) technology. Additionally, if you use standards-based network management interfaces and protocols, the CDM can be directly integrated with other Cisco or customer-provided operations management systems for delivery of integrated, end-to-end service management solutions.
The limitations and restrictions for Cisco IOS Release 12.0(8)DA4 are the same as the limitations and restrictions for Cisco IOS Release 12.0(8)DA3, listed below.
The following restrictions apply to this release:
The following restrictions apply to this release:
The following restrictions apply to this release:
The following restrictions apply to this release:
The following restrictions apply to this release:
Under some circumstances, lines using the standard training mode, which is the default, might train more slowly than they did under previous software releases. Therefore Cisco now recommends that you use quick training mode instead of standard. Use the command dmt training-mode quick to set the training mode for a DSL profile.
If you use both the Cisco DSL Manager (CDM) application and the command line interface (CLI) to configure and manage your DSLAMs, you need to use the CDM to synchronize your management database on a regular basis. (If you use only the CDM or only the CLI, you need not worry about synchronizing your database.) Refer to the Cisco DSL Manager 2.0 release notes for more information.
Turn console logging off if you plan to reboot the DSLAM. Turn console logging back on after the system comes up. (Console logging is turned on by default.) Use the global configuration commands no logging console (to turn the feature off) and logging console (to turn it on).
If console logging is on when the system reboots, the large volume of console messages consumes CPU time. As a result, the system comes back up more slowly and line cards might reload repeatedly, causing further delays.
This section describes unexpected behavior in the system. A tracking number, if one exists, is provided in square brackets at the end of each description. Please refer to the tracking number if you communicate with Cisco about any of these issues.
The caveats for Cisco IOS Release 12.0(8)DA4 are the same as the caveats for the previous releases. See "Open Caveats Release 12.0(8)DA1," below.
The caveats for Cisco IOS Release 12.0(8)DA3 are the same as the caveats for the two previous releases. See "Open Caveats Release 12.0(8)DA1," below.
The caveats for Cisco IOS Release 12.0(8)DA2 are the same as the caveats for the previous release. See "Open Caveats Release 12.0(8)DA1," below.
Periodically, the system generates a serial management bus cyclic redundancy check (SMBCRC) error message such as this:
%NI2-5-LC_NOTICE:Slot[15] SMBCRC (1 days, 3 hours, 37 minutes, 6 seconds)
These messages are informational only and do not affect performance. [CSCdp00996]
The dmtCodewordSize object does not allow a setting of automatic, as the CLI does. [CSCdp19413]
Problems Affecting Management Systems
These problems affect SNMP-based management systems, including the Cisco DSL Manager (CDM). You can work around these problems by using the CLI.
The system incorrectly allows you to create VBR-RT and VBR-NRT tunnels. In fact the system can handle only CBR tunnels, and tunnels created as VBR-RT or VBR-NRT behave like CBR tunnels. [CSCdp21731]
We recommend that trellis coding not be enabled in this release. (Trellis coding is disabled by default.)
Although trellis coding works reliably on most loops and most trains, it does not always work reliably. For some trains on some loops, enabling trellis coding causes continuous errored seconds, as well as corrupted data in the upstream direction. There is no way to predict the circumstances under which this happens. This will be fixed in a later release. [CSCdm73343]
Under certain combinations of upstream bit rate and overhead framing mode, no valid data flows upstream. When the line trains at these combinations, data going upstream is corrupted. Avoid these data rate and framing mode combinations:
| Upstream Bit Rate | Overhead Framing Mode |
|---|---|
32 kbps | Mode 1 |
64 kbps | Mode 2 |
96 kbps | Mode 3 |
Workaround: To avoid this data corruption problem, use these combinations of settings for the lower data rates:
| Upstream Bit Rate | Overhead Framing Mode |
|---|---|
32 kbps | Mode 3 |
64 kbps | Mode 1 |
96 kbps | Mode 1 |
[CSCdm66085]
If the 4DMT line card boot register is set for the card to reload application code, it reloads when the system reboots even if the load image is the same as the code already loaded on the card. (The reload takes about 2 minutes.) This problem occurs only when the system is rebooted; it does not occur when the line card is installed in a chassis. The card should reload only if the version of the load image is different from the version for the code already loaded. [CSCdm64615]
The dmt bitswap margin command has no effect in this release. Bit swapping is always disabled. [CSCdm80069]
When the DLSAM is connected to a Cisco 676 or any other CPE that is based on ADI's AD20MSP910 chipset (which was designed to support the older Issue 1 version of the T1.413 ADSL standard), you might experience higher than normal numbers of errored seconds, corrected superframes, and uncorrected superframes. This can occur when the interleaving delay is configured at values less than the maximum (16 msec). The errors can occur in both the upstream and downstream directions. This problem might be more apparent with short loop lengths (for example, those less than 4000 feet).
Workarounds: Do either of the following to eliminate the problem:
When a port is set to use quick training mode, its symbols per codeword value is sometimes reported as "?" (a question mark). This value is displayed when you enter the show dsl int atm command. [CSCdm91877]
The value you configure for the check bytes parameter might not be properly reported by the system. An incorrect check bytes value equal to half of the configured value is reported when the port is set to use standard training mode and the downstream data rate is greater than 7 Mbps. Only the downstream path is affected. The actual ratio of user data to check bytes matches the configuration. [CSCdm90741]
When a line that is configured for quick-train training mode trains to a downstream bit rate of 8 Mbps or higher, the actual interleaving delay might be reported incorrectly. (The interleaving delay appears in the display for the command show dsl int atm slot/port.) When this problem occurs, the reported interleaving delay is one-half of the value that is actually in effect. [CSCdp14712]
If the BITS plug is configured as the system's timing source, and the BITS clock source fails, an alarm is generated. (This behavior is correct.) However, the alarm is not cleared even after the BITS plug is removed from the valid list of clock sources. [CSCdp26405]
If you create a PVC using network management, the system does not allow you to enable OAM RDI. Regardless of your selection for OAM RDI, the cross connect setting forces the OAM RDI to disable. This is related to the CDM issue CSCdp08324.
Workaround: In CDM, edit the PVC and enable OAM RDI. Or in the CLI, use the interface configuration version of the atm oam rdi command. [CSCdp74861]
The maximum size of input queue counter that can be supported by hardware is 255 cells. (You can configure this using the max-size argument of the atm input-queue command.) But software allows configuration of values beyond 255. Limiting input traffic will work only for queue sizes configured 255 cells or less. When you enter a value higher than 255, no input queue function is performed—all traffic is allowed through. [CSCdp25887]
No matter what you set the configuration register or the bootvar to, rommon always boots up off bootflash.
Workaround: To correct the problem, follow these steps.
boot system flash flash:ni2-dsl-dmt.120-8.DA
Step 2 To make the system boot correctly, enter these commands, beginning in privileged EXEC mode:
c6260#> configure terminal
c6260#> config-register 0x2102
[CSCdp61780]
Periodically, the system generates a serial management bus cyclic redundancy check (SMBCRC) error message such as this:
%NI2-5-LC_NOTICE:Slot[15] SMBCRC (1 days, 3 hours, 37 minutes, 6 seconds)
These messages are informational only and do not affect performance. [CSCdp00996]
These problems affect SNMP-based management systems, including the Cisco DSL Manager (CDM). You can work around these problems by using the CLI.
In the Cisco 6130, the fan LEDs on the NI-2 card are not used. Fan status is indicated by the fan LEDs on the fan tray. [CSCdm92642]
The system incorrectly allows you to create VBR-RT and VBR-NRT tunnels. In fact the system can handle only CBR tunnels, and tunnels created as VBR-RT or VBR-NRT behave like CBR tunnels. [CSCdp21731]
We recommend that trellis coding not be enabled in this release. (Trellis coding is disabled by default.)
Although trellis coding works reliably on most loops and most trains, it does not always work reliably. For some trains on some loops, enabling trellis coding causes continuous errored seconds, as well as corrupted data in the upstream direction. There is no way to predict the circumstances under which this happens. This will be fixed in a later release. [CSCdm73343]
Under certain combinations of upstream bit rate and overhead framing mode, no valid data flows upstream. When the line trains at these combinations, data going upstream is corrupted. Avoid these data rate and framing mode combinations
:
| Upstream Bit Rate | Overhead Framing Mode |
|---|---|
32 kbps | Mode 1 |
64 kbps | Mode 2 |
96 kbps | Mode 3 |
Workaround: To avoid this data corruption problem, use these combinations of settings for the lower data rates
:
| Upstream Bit Rate | Overhead Framing Mode |
|---|---|
32 kbps | Mode 3 |
64 kbps | Mode 1 |
96 kbps | Mode 1 |
[CSCdm66085]
If the 4DMT line card boot register is set for the card to reload application code, it reloads when the system reboots even if the load image is the same as the code already loaded on the card. (The reload takes about 2 minutes.) This problem occurs only when the system is rebooted; it does not occur when the line card is installed in a chassis. The card should reload only if the version of the load image is different from the version for the code already loaded. [CSCdm64615]
The dmt bitswap margin command has no effect in this release. Bit swapping is always disabled. [CSCdm80069]
When the DLSAM is connected to a Cisco 676 or any other CPE that is based on ADI's AD20MSP910 chipset (which was designed to support the older Issue 1 version of the T1.413 ADSL standard), you might experience higher than normal numbers of errored seconds, corrected superframes, and uncorrected superframes. This can occur when the interleaving delay is configured at values less than the maximum (16 msec). The errors can occur in both the upstream and downstream directions. This problem might be more apparent with short loop lengths (for example, those less than 4000 feet).
Workarounds: Do either of the following to eliminate the problem:
When a port is set to use quick training mode, its symbols per codeword value is sometimes reported as "?" (a question mark). This value is displayed when you enter the show dsl int atm command. [CSCdm91877]
The value you configure for the check bytes parameter might not be properly reported by the system. An incorrect check bytes value equal to half of the configured value is reported when the port is set to use standard training mode and the downstream data rate is greater than 7 Mbps. Only the downstream path is affected. The actual ratio of user data to check bytes matches the configuration. [CSCdm90741]
When a line that is configured for quick-train training mode trains to a downstream bit rate of 8 Mbps or higher, the actual interleaving delay might be reported incorrectly. (The interleaving delay appears in the display for the command show dsl int atm slot/port.) When this problem occurs, the reported interleaving delay is one-half of the value that is actually in effect. [CSCdp14712]
We recommend that trellis coding not be enabled in this release. (Trellis coding is disabled by default.)
Although trellis coding works reliably on most loops and most trains, it does not always work reliably. For some trains on some loops, enabling trellis coding causes continuous errored seconds, as well as corrupted data in the upstream direction. There is no way to predict the circumstances under which this happens. This will be fixed in a later release. [CSCdm73343]
Under certain combinations of upstream bit rate and overhead framing mode, no valid data flows upstream. When the line trains at these combinations, data going upstream is corrupted. Avoid these data rate and framing mode combinations:
| Upstream Bit Rate | Overhead Framing Mode |
|---|---|
32 kbps | Mode 1 |
64 kbps | Mode 2 |
96 kbps | Mode 3 |
Workaround: To avoid this data corruption problem, use these combinations of settings for the lower data rates.
| Upstream Bit Rate | Overhead Framing Mode |
|---|---|
32 kbps | Mode 3 |
64 kbps | Mode 1 |
96 kbps | Mode 1 |
[CSCdm66085]
If the 4DMT line card boot register is set for the card to reload application code, it reloads when the system reboots even if the load image is the same as the code already loaded on the card. (The reload takes about 2 minutes.) This problem occurs only when the system is rebooted; it does not occur when the line card is installed in a chassis. The card should reload only if the version of the load image is different from the version for the code already loaded. [CSCdm64615]
The dmt bitswap margin command has no effect in this release. Bit swapping is always disabled. [CSCdm80069]
When the DLSAM is connected to a Cisco 676 or any other CPE that is based on ADI's AD20MSP910 chipset (which was designed to support the older Issue 1 version of the T1.413 ADSL standard), you might experience higher than normal numbers of errored seconds, corrected superframes, and uncorrected superframes. This can occur when the interleaving delay is configured at values less than the maximum (16 msec). The errors can occur in both the upstream and downstream directions. This problem might be more apparent with short loop lengths (for example, those less than 4000 feet).
Workarounds: Do either of the following to eliminate the problem:
When a port is set to use quick training mode, its symbols per codeword value is sometimes reported as "?" (a question mark). This value is displayed when you enter the show dsl int atm command. [CSCdm91877]
The value you configure for the check bytes parameter might not be properly reported by the system. An incorrect check bytes value equal to half of the configured value is reported when the port is set to use standard training mode and the downstream data rate is greater than 7 Mbps. Only the downstream path is affected. The actual ratio of user data to check bytes matches the configuration. [CSCdm90741]
The squeeze command, which defragments the flash memory, is CPU intensive. It causes the NI-2 card to lose contact with some line cards, which causes ports on those cards to retrain.
Workaround: Use the squeeze command only during maintenance. [CSCdp02339]
The problem listed in Table 1 is fixed in Cisco IOS Release 12.0(8)DA4.
| Caveat Number | Description |
|---|---|
CSCdr26662 | When another device sets the UU field of the AAL5 trailer to a nonzero value, the Cisco 6260 treats all incoming packets terminating on interface ATM0/0 (the SAR) as giant packets, which are discarded. |
The problem listed in Table 2 is fixed in Cisco IOS Release 12.0(8)DA3.
| Caveat Number | Description |
|---|---|
CSCdr18187 | The SNMP agent does not work for the ATM MIB variable atmInterfaceMaxActiveVpiBits. When an snmpset is done on this variable, the SNMP agent reports an error. |
There are no resolved caveats in Cisco IOS Release 12.0(8)DA2.
The problems listed in Table 3 are fixed in Cisco IOS Release 12.0(8)DA1.
| Caveat Number | Description |
|---|---|
CSCdp25790 | The alarms command disables minor DMT alarms on subscriber ports, as it should, but it does not clear existing alarms. |
CSCdp03335, CSCdp21747 | The MIB and in some cases the CLI allow you to set invalid VPI values. Legal values are 0 to 31. However, values up to 255 are accepted by the MIB and by certain CLI commands, including atm soft-vp. |
The problem listed in Table 4 is fixed in Cisco IOS Release 12.0(5)DA1.
| Caveat Number | Description |
|---|---|
CSCdp02339 | The squeeze command causes subscriber ports to retrain. |
These documents contain information that might be useful to Cisco 6260 users:
These documents contain information that might be useful to Cisco 6130 users:
In these ATM software manuals, look for information pertaining to the LightStream 1010, which uses the same software base as the Cisco 6000 Family DSLAMs:
Cisco Connection Online (CCO) is Cisco Systems' primary, real-time support channel. Maintenance customers and partners can self-register on CCO to obtain additional information and services.
Available 24 hours a day, 7 days a week, CCO provides a wealth of standard and value-added services to Cisco's customers and business partners. CCO services include product information, product documentation, software updates, release notes, technical tips, the Bug Navigator, configuration notes, brochures, descriptions of service offerings, and download access to public and authorized files.
CCO serves a wide variety of users through two interfaces that are updated and enhanced simultaneously: a character-based version and a multimedia version that resides on the World Wide Web (WWW). The character-based CCO supports Zmodem, Kermit, Xmodem, FTP, and Internet e-mail, and it is excellent for quick access to information over lower bandwidths. The WWW version of CCO provides richly formatted documents with photographs, figures, graphics, and video, as well as hyperlinks to related information.
You can access CCO in the following ways:
For a copy of CCO's Frequently Asked Questions (FAQ), contact cco-help@cisco.com. For additional information, contact cco-team@cisco.com.
|
Note If you are a network administrator and need personal technical assistance with a Cisco product that is under warranty or covered by a maintenance contract, contact Cisco's Technical Assistance Center (TAC) at 800 553-2447, 408 526-7209, or tac@cisco.com. To obtain general information about Cisco Systems, Cisco products, or upgrades, contact 800 553-6387, 408 526-7208, or cs-rep@cisco.com. |
Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM, a member of the Cisco Connection Family, is updated monthly. Therefore, it might be more current than printed documentation. To order additional copies of the Documentation CD-ROM, contact your local sales representative or call customer service. The CD-ROM package is available as a single package or through an annual subscription. You can also access Cisco documentation on the World Wide Web at http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com.
If you are reading Cisco product documentation on the World Wide Web, you can submit comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco. We appreciate your comments.
Posted: Fri Mar 15 07:30:00 PST 2002
All contents are Copyright © 1992--2002 Cisco Systems, Inc. All rights reserved.
Important Notices and Privacy Statement.