Table Of Contents
Release Notes for Cisco IOS Release 12.2(12)DA2 for Cisco DSLAMs with NI-2 Cards
February 11, 2008
These release notes describe features and caveats in Cisco IOS Release 12.2(12)DA2 for the Cisco 6015, Cisco 6160, and Cisco 6260 digital subscriber line access multiplexers (DSLAMs).
Cisco IOS Release 12.2(12)DA2 is based on Cisco IOS Release 12.2(12)DA1 and includes all of the new features introduced in 12.2(12)DA as well as corrections made in 12.2(12)DA1. To see the release notes for Cisco IOS Release 12.2(12)DA1, go to www.cisco.com and click Products & Services > Switches > Cisco 6000 Series IP DSL Switches > Technical Documentation > Instructions and Guides > Release Notes > Release Notes for Cisco IOS Release 12.2(12)DA1 for Cisco DSLAMs with NI-2 Cards.
Note When you upgrade from Cisco IOS Release 12.1(5)DA1 or earlier images on the NI-2 card to Release 12.2(12)DA2, you must format the bootflash on the NI-2 card before loading the Release 12.2(12)DA2 dboot image. See the "Limitations and Restrictions" section.
For pointers to more information about the Cisco 6015, Cisco 6160, and Cisco 6260 DSLAMs, and their software, refer to the "Related Documentation" section. To learn more about caveats, visit the Cisco web site—see the "Obtaining Documentation" section for details. Information about electronic documentation can be found in both the "Obtaining Documentation" section and the "Documentation CD-ROM" section.
This document contains the following topics:
Cisco IOS Release 12.2(12)DA runs on these DSLAMs:
•Cisco 6015 DSLAM
•Cisco 6160 DSLAM
•Cisco 6260 DSLAM
New and Changed Information
The following sections provide new and changed information for Cisco IOSRelease 12.2(12)DA2, Release 12.2(12)DA1, Release 12.2(12)DA, and Release 12.2(10)DA.
Cisco IOS Release 12.(2)12DA2
Cisco IOS Release 12.2(12)DA2 is based on Cisco IOS Releases 12.2(12)DA and 12.2(12)DA1 including all of the new features introduced in release12.2(12)DA and corrections from 12.2(12)DA1. In addition, this release fixes the bugs described in the "Resolved Caveats—Release 12.2(12)DA2" section.
Cisco IOS Release 12.(2)12DA1
Cisco IOS Release 12.2(12)DA1 is based on Cisco IOS Release 12.2(12)DA and includes all of the new features introduced in that release. In addition, this release fixes the bugs described in the "Resolved Caveats—Release 12.2(12)DA1" section.
New Hardware Features in Release 12.(2)12DA
Cisco IOS Release 12.2(12)DA introduces the following new hardware feature:
•The Cisco OC-3c/OC-3c NI-2 card has been enhanced to support quality of service (QoS) in a fully loaded chassis of G.SHDSL SHTU-C (8xG.SHDSL) line cards. This enhancement eliminates the random cell drops that previously occurred in a chassis loaded with more than 16 G.SHDSL line cards.
Use the enhanced NI-2 card if you plan to deploy more than 16 G.SHDSL line cards in a Cisco DSLAM.
Notes A Cisco DSLAM can support either legacy or enhanced NI-2 cards.
The new NI-2 cards (NI-2-155SM-155SM2 and NI-2-155MM-155MM2) support Cisco IOS Release 12.1(7)DA2 or later; however, the card's new features are only enabled in Release 12.2(12)DA or later.
Enhanced Cisco OC-3c/OC-3c NI-2 Card Overview
This section describes how the Cisco OC-3c/OC-3c NI-2 card was enhanced to support QoS in a fully loaded chassis of G.SHDSL SHTU-C (8xG.SHDSL) line cards.
To accommodate these enhancements, the following changes were made to the legacy NI-2 card:
•The upstream field programmable gate array (FPGA) was enhanced to support QoS tables for the upstream traffic manager (UPTM).
The DSLAM automatically builds the upstream QoS tables using the QoS values defined by commands such as atm connection-traffic-table-row and atm pvc. (See the "New and Changed Software for New Cisco OC-3c/OC-3c NI-2 Cards" section for a list of atm commands used to set upstream QoS table values.)
•The size of the bootflash memory and main dynamic RAM (DRAM) were increased (see Table 1).
Supported Cisco DSLAM Chassis
The enhanced NI-2 card can be installed in the following Cisco DSLAM chassis:
Cisco 6100 DSLAM
Cisco 6130 DSLAM
Cisco 6015 DSLAM
Cisco 6160 DSLAM
Cisco 6260 DSLAM
OC-3c/OC-3c NI-2 Card Memory Enhancements
Table 1 shows the memory enhancements made to the new Cisco OC-3c/OC-3c NI-2 card.
Table 1 NI-2 Memory Enhancements
Memory Type New NI-2 Card Legacy NI-2 Card
New and Changed Software for New Cisco OC-3c/OC-3c NI-2 Cards
The following list describes the software changes made to accommodate the enhanced NI-2 card:
•The show hardware command output displays the new NI-2 card types:
•The following atm commands were enhanced to accommodate upstream QoS tables. In addition to configuring the QoS values for the ATM switch component of the DSLAM, these commands now also define the values for the upstream QoS tables.
•The show ni2-switch registers and show ni2-switch memory commands have been enhanced to show upstream field programmable gate array (FPGA) data. For more information, see the description of these commands in the Command Reference for Cisco DSLAMs with NI-2.
•Two new object identifiers (OIDs) were added to the CISCO-ENTITY-VENDORTYPE-OID-MIB for the enhanced Cisco OC-3c/OC-3c NI-2 cards:
•The policer function was modified to reduce congestion in the DSLAM. The policer was moved to the upstream FPGA, which is closer to the upstream source. Note that as a result of this change, the DSLAM experiences low data throughput when policing on peak cell rate (PCR) with a large packet size and a data rate that greatly exceeds the selected PCR.
Cisco OC-3c/OC-3c NI-2 Card Requirements
The following requirements apply to legacy and enhanced Cisco OC-3c/OC-3c NI-2 cards:
Enhanced NI-2 Card Requirements
•An enhanced NI-2 card (NI-2-155SM-155SM2 or NI-2-155MM-155MM2).
•Cisco IOS Release 12.2(12)DA or later. The enhanced NI-2 card supports Release 12.1(7)DA2 or later. However, the card's new features are only enabled in Release 12.2(12)DA or later.
•A new ni2-dboot2-mz image (which is shipped preinstalled in the NI-2 bootflash memory).
Note The old dboot image does not work on enhanced NI-2 cards. If you load a dboot image onto a new NI-2 card, the NI-2 card becomes inoperable. (See the "Correcting Bootup Problems" section for instructions on how to recover if this happens.)
Legacy NI-2 Card Requirements
•A legacy NI-2 card.
•A Cisco IOS software release that supports the features you need.
•A corresponding ni2-dboot-mz image.
New Software Features in Release 12.2(12)DA
Cisco IOS Release 12.2(12)DA introduces the following new software feature:
•The Octal-Port DMT ATU-C over ISDN (8xDMT over ISDN) line card has been enhanced to operate with the following customer premises equipment (CPEs):
–Cisco SOHO 76 and 826 CPEs
Note Alcatel-based CPEs and Cisco SOHO 76 and 826 CPEs require Cisco IOS Release 12.2(4)YA2 or later. We also recommend that you issue the dsl operating-mode annexb-ur2 command at the CPE to enable DMT operating mode on these CPEs.
New Hardware Features in Release 12.2(10)DA
No new hardware features were introduced in Cisco IOS Release 12.2(10)DA.
New Software Features in Release 12.2(10)DA
The following new software features were introduced in Cisco IOS Release 12.2(10)DA.
The 8xDMT line card can run in power-management mode in the G.dmt or the T1.413 mode. The resulting power cutback produces a reduction in power dissipation and crosstalk. Only 8xDMT line cards support power management. All CPEs may not support the DSL functionality for power management to function correctly. Check with a Cisco customer representative to verify CPE compatibility with the 8xDMT power management.
You control the power management feature by including a dmt power-management-additional-margin command in a profile and assigning that profile to a line card interface. This Cisco IOS software command allows you to set the additional margin for each channel from 0 dB (off) to 15 dB. This sets the additional margin that will be added to the target margin. If the sum of the target margin and additional margin exceeds 15dB, it is capped at 15dB. If the actual margin of the line is higher than the sum of the configured target and additional margin, and all the above conditions are met, then power management attempts to reduce the actual margin, and as a consequence the power level as well.
Not all CPE support power management. If you connect an unsupported CPE to a port on which power management is turned on, you will not see a reduction in the actual margin or power level. The operating modes supported by power management are T1.413and G-992-1 (G.DMT). Table 2 shows the CPE and specifies which operating mode supports them.
A reduction in the power level occurs if there is excess margin on the line. For the downstream direction, if there is excess margin, then IOS displays a reduction in margin for the modes listed above, and a reduction in transmit power for T1.413 mode. For the upstream direction, if there is excess margin, then Cisco IOS software displays a reduction in the margin for G-992-1 mode only. Cisco IOS software does not display a reduction in transmit power for the upstream direction.
ATM OAM Cells Supported in Fast Path Mode
The NI-2 card now supports ATM OAM cells through fast path mode. Also, you can now use the ping atm utility command in fast path mode.
Enhanced ATM OAM Segment Cells Support
A new command, atm oam intercept segment, allows you to enable or disable receiving ATM OAM segment cells on valid connections. By default, ATM OAM cells received on unconfigured or down connections are dropped. For more information, see the Command Reference for Cisco DSLAMs with NI-2.
MIB Object Changes
This release contains changes to the following Management Information Base (MIB) objects:
The power management feature is configurable through the CISCO-ADSL-DMT-LINE-MIB. The MIB object cAdslAtucDmtConfPMAddSnrMgn configures the downstream component and the MIB object cAdslAturDmtConfPMAddSnrMgn configures the upstream component on that particular DSL profile. Both objects have a default value of 0 and can be configured from 0 to 150 tenths of a dB in increments of 10. Using SNMP to set the objects to 0 disables the power management feature on the ports.
The following sections provide useful information for Cisco IOS Release 12.2(12)DA2 installation and operation:
•Upgrading Bootflash on a Legacy NI-2 Card to the 12.2(12)DA2 dboot Image (Legacy NI-2 Cards)
•Upgrade Bootflash on a Legacy NI-2 Card to the 12.1(5)DA1 dboot Image (Legacy NI-2 Cards)
•Booting the Enhanced OC-3/OC-3 NI-2 Card (Enhanced NI-2 Cards)
Upgrading Bootflash on a Legacy NI-2 Card to the 12.2(12)DA2 dboot Image
When you upgrade from Cisco IOS Release 12.1(5)DA1 or earlier images on a legacy NI-2 card to Release 12.2(12)DA2, you must reformat the bootflash on the NI-2 card.
If you are upgrading from Cisco IOS Release 12.1(7)DA3, 12.2(1b)DA1, 12.2(5)DA1, 12.2(7)DA, 12.2(10) DA, 12.2(12)DA or 12.2(12)DA1 you do not need to reformat the bootflash. You can skip this section and follow the DSLAM upgrade procedure at the following URL:
Note We recommend that you have console access to the NI-2 card during the upgrade procedure. You can use the console connection to troubleshoot any unexpected events that occur during the upgrade.
To upgrade the boot image on a legacy NI-2 card, perform the following steps in privileged EXEC mode:
DSLAM# show hardware
Verify the type of Cisco OC-3c/OC-3c NI-2 card installed in the chassis to determine whether to download a new dboot image:
•NI2-155MM-155MM2 or NI2-155SM-SM2—Indicates a new Cisco OC-3c/OC-3c NI-2 card, which is shipped with the correct image (dboot2) preinstalled. Skip this procedure and the following procedure.
•Any other value—Indicates a legacy NI-2 card, which may need to be updated with a new image. Continue with this procedure.
DSLAM# dir bootflash:
Verify that the bootflash image is ni2-dboot-mz.121-5.da1 or ni2-dboot-mz.121-4.da. If it is neither, go to the "Upgrade Bootflash on a Legacy NI-2 Card to the 12.1(5)DA1 dboot Image" section and perform the instructions there, and then return to this step. This is required because of a problem (CSCdr89374) in old bootflash images.
DSLAM# dir flash:
Determine the name of the flash file that begins with ni2- and use it as filename in Step 4.
DSLAM# delete flash:filename
DSLAM# squeeze flash:
Recover available space in flash memory.
DSLAM# copy tftp://tftpserver:TFTPBOOT/ni2 -dsl-mz.122-12.da2 flash:
Copy the Cisco IOS software image from a TFTP server to flash.
DSLAM# configure terminal
DSLAM (config)# no boot system
DSLAM (config)# boot system flash:ni2-dsl-mz.122-12.da2
Enter global configuration mode.
Disable the boot from system.
Specify the name of the system image to load at startup.
Exit global configuration mode.
DSLAM# copy running-config startup-config
Save your changes to the startup configuration.
Reload the system to upgrade the image.
DSLAM# show version
Confirm that the running image is ni2-dsl-mz.122-12.da2. If it is not, go to Step 6.
DSLAM# format bootflash:
Erase all information in bootflash memory. Answer y to all confirm questions. When the DSLAM returns to the EXEC prompt, bootflash memory is successfully formatted and ready for use.
Ensure that the bootflash is 3.8 MB total. If it is not, go to Step 5.
DSLAM# copy tftp://tftpserver:TFTPBOOT/ni2 -dboot-mz.122-12.da2 bootflash:
Copy the boot image from a TFTP server to the bootflash.
Reload the system to upgrade the image.
Upgrade Bootflash on a Legacy NI-2 Card to the 12.1(5)DA1 dboot Image
When you upgrade from Release 12.1(3)DA or earlier images on a legacy NI-2 card to Release 12.1(5)DA1, we recommend that you upgrade the bootflash image on the NI-2 card to the 12.1(5)DA1 dboot image.
To upgrade the dboot image in bootflash on a legacy NI-2 card, perform the following steps:
Enter enable mode.
Enter the password.
The enable mode prompt is DSLAM#.
DSLAM# delete bootflash:filename
Make room in the bootflash by deleting the name of the current boot image.
DSLAM# squeeze bootflash
Recover available space in bootflash using the squeeze bootflash command.
DSLAM# copy tftp://[server name] /[directory]/ni2-dboot-mz.121-5.da1 bootflash:
Copy the boot image to the bootflash.
DSLAM# show version
Record the current value of the config-register that appears on the last line of the show version display.
DSLAM# configure terminal
Enter global configuration mode, which has a prompt of
DSLAM(config)# config-register 0
Set the config register to 0x0000 so that the NI-2 card reboots in the ROM monitor.
Exit global configuration mode.
DSLAM# copy running-config startup-config
Save the running configuration.
Reset the system.
If you see BOOTLDR after you enter this command, the image in bootflash is already being used as the bootstrap image; go to Step 15. Otherwise, go to Step 12 and enter the commands in Steps 12 through 14 to force the system to use ni2-dboot-mz.121-5.bin as the bootstrap image.
rommon> unset BOOTLDR
Unset BOOTLDR to remove the variable.
Sync to save the state of rommon.
When the NI-2 card boots, it uses ni2-dboot-mz.121-5da.bin as the bootstrap image.
DSLAM# configure terminal
Enter global configuration mode, which has a prompt of
DSLAM(config)# config-register value
Set the config-register to the value you recorded in Step 5.
Return to enable mode.
Go to the "Limitations and Restrictions" section.
Booting the Enhanced OC-3/OC-3 NI-2 Card
Before attempting to boot the DSLAM, consider the following:
•The new NI-2 cards (NI-2-155SM-155SM2 and NI-2-155MM-155MM2) work only with a new ni2-dboot2-mz image that is shipped preinstalled in the NI-2 bootflash. New NI-2 cards do not run with an old dboot image.
•Legacy NI-2 cards require an ni2-dboot-mz image; they do not run with the new dboot2 image.
Caution New NI-2 cards support Cisco IOS Release 12.2(12)DA and later, and Releases 12.1(7)DA2 to 12.2(10)DA. However, to run Releases 12.1(7)DA2 to 12.2(10)DA, you must load the dboot2 image before you load the Cisco IOS software image. Otherwise, the DSLAM becomes inoperable.
To boot the enhanced Cisco OC-3/OC-3 NI-2 card, follow the instructions in the Configuration Guide for Cisco DSLAMs with NI-2. See the section "Booting from Flash Memory Configuration Tasks" in chapter 9, "Loading System Software Images and Configuration Files," at the following URL:
Correcting Bootup Problems
If you attempt to run an incorrect dboot or dboot2 image, or you attempt to boot a new NI-2 card with legacy Cisco IOS software before booting the new dboot2 image, the DSLAM becomes inoperable. If this occurs, see the following sections for information about how to correct the problem and make the DSLAM operational:
Running Cisco IOS Release 12.1(7)DA2 to 12.2(10)DA on a New NI-2 Card
You can run Cisco IOS Releases 12.1(7)DA2 to 12.2(10)DA on the new NI-2 cards (NI2-155MM-155MM2 and NI2-155SM-155SM2). However, before you attempt to boot the Cisco IOS software from flash, you must first boot the ni2-dboot2-mz (dboot2) image from bootflash.
Note To run Cisco IOS releases earlier than Release 12.2(12)DA on a new NI-2 card, do not boot from flash until you have booted the ni2-dboot2-mz image from bootflash. Otherwise, the DSLAM becomes inoperable.
If you encounter problems booting Cisco IOS Release 12.1(7)DA2 to 12.2(10)DA on the new NI-2 cards, perform the following steps to correct the problem and make the DSLAM operational:
Step 1 Issue the following command in to ensure that the correct dboot2 image is loaded in bootflash memory:DSLAM> show ni2-switch register
Step 2 Check the command output to make sure the FPGA major revision is 3 (see highlighted text below). This indicates that the dboot2 image is loaded.
Upstream FPGA revisionMAJ:3 Minor:0
Step 3 Issue the following command in global-configuration mode to set the configuration register to load the DSLAM image from the boot system commands in the startup configuration file:DSLAM(config)# config-register 0x2102
Step 4 Exit configuration mode and reload (reboot) the DSLAM to make the DSLAM operational. This process loads the images in the correct order: dboot2 and then the legacy Cisco IOS software.DSLAM(config)# endDSLAM# reload
Using Rommon to Recover from Corrupted dboot2 Images
This procedure describes how to use ROM monitor (rommon) mode to recover from problems caused by an invalid or corrupt dboot2 image. This procedure uses the xmodem command to retrieve a valid dboot2 image from a PC or network server.
Note The xmodem command used in this procedure is extremely slow. Therefore, only perform this procedure if all other attempts to obtain a dboot2 image fail. Also note that the command is supported only on the new NI-2 cards (NI2-155MM-155MM2 and NI2-155SM-155SM2).
Step 1 Log in to the DSLAM through a console port. The rommon prompt (
rommon>) should be displayed. If it is not, get into configuration mode and issue the command config-register 0x0 end write reload.
Step 2 Issue the following command at the rommon prompt.rommon> config-register 0x2102
Step 3 Issue the following command to manually boot the DSLAM from bootflash.rommon> boot bootflash: [filename]
Step 5 If the correct dboot2 image is not in bootflash or the image is corrupt, perform the following steps to use the xmodem command to download a valid dboot2 image to use to boot the DSLAM:
a. Open a terminal emulation window (such as Hyper Terminal) on a PC that is connected to the DSLAM through a console port.
b. Configure the following terminal emulation settings: port = com1 or com2, data rate = 9600, bits = 8, parity = none, stop bits = 1. You must use these values for the recovery procedure to work.
c. Make sure that the PC contains a valid dboot2 image or is connected to a network where a dboot2 image is stored on a server.
d. On the DSLAM, issue the following command to copy the dboot2 image to the specified filename. The command creates a temporary copy of the dboot2 image on the DSLAM; therefore, you must copy the image to bootflash or it will be lost when you reload the DSLAM (Step 6).rommon> xmodem filename
e. Wait for a prompt indicating that rommon is ready to receive the file.
f. In the Hyper Terminal window on the PC, click Transfer in the menu bar at the top of the window and select Send File.
g. Select Xmodem as the protocol, and specify the name of the dboot2 image to copy to the DSLAM.
h. Click Send to start the copy.
Note It may take 1 hour or more for the copy to complete.
i. When the download completes, the DSLAM boots automatically.
Step 6 To complete the recovery procedure, copy the dboot2 image to bootflash memory (for example, using TFTP). If you do not perform this step, the dboot2 image will be lost when you reload the DSLAM.
Step 7 To finish booting the DSLAM, issue the following command:DSLAM> reload
Limitations and Restrictions
The following sections describe the limitations and restrictions for Cisco IOS software DSLAM releases.
Redundant NI-2 Card Operation
When using NI-2 cards in a redundant fashion, we recommend that you issue the command redundancy reload-peer on the active NI-2 card after the system has loaded. This causes the redundant NI-2 to reload and ensures that the redundant configuration is operational.
In rare instances during testing, a redundant NI-2 card sometimes appeared to be functional but was not. Issuing the redundancy reload-peer command corrected the problem every time.
Attainable Bit Rate Is Conservative on 4xflexi-DMT and 8xDMT
The reported DMT aggregate bit rate is less than the true attainable bit rate.
Due to line condition variations between trains, the effect of trellis encoding, interleave delay, FEC check bytes, and so forth, the attainable bit rate estimate is not always 100 percent accurate. A conservative approach was taken in making the estimate; therefore, in general, you can get a higher rate than what the estimate suggests. For a fast-path scenario, the results should track fairly closely for the downstream rate and err on the conservative side for the upstream rate. For an interleave path scenario, the results are highly dependent on configurations.
At a higher reach or where line conditions are not optimal, trellis encoding, interleave delay, and FEC check bytes can provide a much higher rate than was estimated (greater than 128 kbps).
There is no workaround. The aggregate bit rate calculation is an estimate, which does not accurately model all of the line conditions that affect the true attainable bit rate for a given profile. The calculations for aggregate bit rate are performed as follows:
•The downstream capacity is obtained from the number of Reed-Solomon payload bytes per frame exchanged during line training, that is, the K value. The per-second estimate is then calculated from this K value. An extrapolated margin value is derived from the per-second estimate to make sure that if the line is trained at the estimated rate, it has an adequate margin.
•For upstream, unlike downstream, the Reed-Solomon payload bytes per frame is not readily available. Furthermore, unlike downstream, which requires a CPE EOC response to know the downstream margin, the upstream margin is readily available at the CO (upstream margin is measured at the CO end). Using this upstream margin and the number of bins utilized for upstream, an estimate of upstream attainable bit rate is made. (The associated DDTS numbers are CSCdv05351 and CSCdv05322.)
CPE Performance Issues with Overhead Framing Modes 0, 1 and 2
The CPE does not train or perform reliably when the Discrete Multitone (DMT) profile is set to use overhead framing mode 0, 1, or 2.
Overhead framing modes 0, 1, and 2 are not supported at this time.
Overhead framing mode 3 is designed for use with ATM. While overhead framing mode 1, which is not currently supported, is designed for Synchronous Transport Module (STM) mode. Configure your profiles to use overhead framing mode 3. Overhead framing mode 3 uses only 32 bytes of administrative overhead. Compared with overhead framing mode 1, it allows more bandwidth to be allocated to user data.
Trellis Encoding Enable Default Recommendations
Trellis encoding is disabled by default on the NI-2 card because it is not supported on the 4xDMT (ATUC-1-4DMT) line card. However, trellis encoding is supported on the 4xFlexiDMT (ATUC-4FLEXIDMT) line card and the 8xDMT (ATUC-1-DMT8 and ATUC-1-DMT8-I) line cards.
•For 4xDMT (ATUC-1-4DMT) ports—Disable trellis encoding in the DSL profile for those ports.
•For 4xFlexiDMT (ATUC-4FLEXIDMT) ports—Enable trellis encoding, except with ADI chipset-based CPEs that use ADI firmware prior to ADI 3.1. This includes all Cisco 677 and Cisco 627 CPEs.
•For 8xDMT (ATUC-1-DMT8 and ATUC-1-DMT8-I) ports—The default DMT setting for trellis encoding is auto-sense, which means that the 8xDMT line card attempts to automatically configure itself for the type of encoding supported on the CPE. If the auto-sense feature does not work, you may have to enable trellis encoding in the DSL profile for these ports.
Note If you are unsure if your CPE supports trellis encoding, check with the manufacturer.
For information about how to change trellis encoding settings on the NI-2 card, see the documentation at the following location:
Restrictions on IP Services
This section describes restrictions on the Cisco NI-2 card IP services.
Restricted Layer 3 Services
Cisco IOS Release 12.2(12)DA2 does not support the following Layer 3 services (or else these services are limited, as noted):
•IP Quality of Service.
•L2TP Tunnel Priority and Limit sessions.
•L2TP Network Server (LNS).
•The maximum number of MPLS/VPN for PPPoA terminations is 25 VPNs for PPPoA and 1 VPN for PPPoE.
•We recommend that you use a virtual template for PPPoX termination rather than a dialer interface.
•MPLS LDP protocol is not supported in this release. Use TDP protocol.
•Up to 32 subinterfaces can be used for IP termination under the trunk or subtend ports.
•Each DSLAM can support up to 50 MPLS VPNs.
Integrated Routing and Bridging Not Supported
MPLS VPN mapping of RFC 1483 routed sessions must not be confused with Integrated Routing and Bridging (IRB). IRB is not supported by MPLS VPN mapping of RFC 1483 routed sessions.
VPN Interfaces Restricted to Trunk Interfaces
Do not configure subtended interfaces for MPLS VPN services. Only trunk interfaces support MPLS VPN mapping of RFC 1483 routed sessions.
MPLS ATM-Label Switch Router Functionality Not Supported
DSLAMs are not meant for use as MPLS ATM-Label Switch Routers (ATM-LSRs). When designing your network, keep in mind that DSLAMs act only as Label Edge Routers (LERs).
Performance Restrictions for MPLS VPN Traffic
MPLS VPN-enabled interfaces do not perform as well as switched VCs. Please take this into consideration when deploying MPLS VPNs in your networks.
Restricted MPLS Features
The following MPLS-related features are not part of the MPLS VPN mapping of RFC 1483 routed sessions:
•MPLS traffic engineering
DSL Interface Limitations
In DSLAMs, each DSL interface can support multiple permanent virtual circuits (PVCs), but we recommend that you use one routed MPLS VC if a dynamic routing protocol (such as RIP) is used between the customer equipment and the provider equipment.
MPLS VPN Mapping Not Supported on the Eight-Port IDSL ITU-C Line Card
Routed termination of IDSL connections has not been supported since Cisco IOS Release 12.2(1b)DA.
Frame Relay PVCs/Soft PVCs on an IDSL Interface
The number of Frame Relay PVCs/Soft PVCs on an IDSL interface is restricted to 1 if you use the default row in a frame-relay connection traffic table (FR-CTT).
When upgrading to Release 12.2(12)DA2 from earlier releases, you must first create a new row in the FR-CTT with the desired CIR value and use the resultant row number during PVC/Soft PVC creation. If you do not create a new row, the second FR PVC/Soft PVC command is not parsed and installed on the IDSL interface.
Use of a Ring Topology in a DSLAM Subtend Environment to Achieve ATM Trunk Redundancy
Ring topology is achieved when a node in the subtend tree is attached to the ATM access to provide a physically redundant loop. Thus, when the primary ATM access or one of the ATM trunks in the subtend tree fails, the soft permanent virtual circuits (SPVCs) can be dynamically rerouted through the use of Private Network-Network Interface (PNNI) (Figure 1).
Figure 1 SPVCs Prior to Failure
This redundancy requires the use of SPVCs. If you use permanent virtual circuits (PVCs) or permanent virtual paths (PVPs), redundancy cannot be provided. The use of the SPVCs allows traffic to be rerouted around the failed access point, because SPVCs leverage this feature of PNNI. When the failure occurs, the SPVCs are disconnected and dynamically reconnected across the new path (Figure 2).
Figure 2 SPVCs Dynamically Rerouted
If you implement ring topology in a DSLAM subtend to achieve ATM trunk redundancy, the following requirements apply:
•You must use SPVCs, PNNI, ATM signaling, and Interim Local Management Interface (ILMI) to enable rerouting. PNNI, ATM signaling, and ILMI are enabled by default. Permanent connections such as PVCs and shaped virtual paths (VPs) do not benefit from the redundant link.
•You must make the redundant link's PNNI administrative weight higher than the PNNI weight of the primary trunk. Once you change the weight of the redundant link, the subtend tree uses this link only if a failure occurs.
When the redundant link is active, the following occurrences are problems:
•Loss of subtending fairness.
•Increase in latency as well as an increase in cell delay variation (CDV) between the cells. Delay-sensitive traffic, such as voice and video, or traffic that is susceptible to jitter, such as constant bit rate (CBR) voice, might be compromised. This technique is best realized for unspecified bit rate (UBR) traffic, such as consumer internet access, where no strict quality of service (QoS) objectives are required.
Once the redundant link is active, the following occurrences are potential problems:
•Greater possibility of increased congestion in the DSLAM ATM switch fabric, which might cause loss of data.
•When the main link is restored, there is downtime while the path is being rerouted. After the SPVCs are rerouted to the redundant ATM trunk and the original trunk is repaired or brought back into service, you must manually intervene. You must flap (shut/noshut) the subtend port. Because of retries on the current path, you must keep the trunk down until the maximum retry interval expires.
Cisco DSL Manager
If you are using versions of Cisco DSL Manager (CDM) earlier than CDM Release 3.4—from CDM Release 1.0 to CDM Release 3.3(3)—do not upgrade the DSLAMs to this new Cisco IOS release.
If you use both the CDM network management application and the Cisco IOS command line interface to manage your Cisco DSLAMs, you should be aware of certain configuration and procedural implications. Refer to the Release Notes for the Cisco DSL Manager, Release 3.4, for this information.
This section provides important information about Cisco IOS software releases for DSLAMs.
Line Card Features
Table 3 shows which line card features are available on the 4xDMT, 4xFlexi, and 8xDMT line cards.
NI-2 Card IP Services
During system startup, the following protocol warning messages display. You can ignore these messages.
•If RADIUS is configured:%AAAA-4-SERVUNDEF: The server-group "radius" is not defined. Please define it.
•If VPN is configured:% Can't create VRF
Soft PVC Address Changes upon Upgrade from Release 12.1(4)DA or Earlier
When you upgrade from Cisco IOS Release 12.1(4)DA or earlier to Release 12.2(12)DA2, the default soft PVC addresses on all interfaces change. This occurs only when you upgrade to Release 12.2(12)DA2 from Release 12.1(4)DA or earlier.
Reconfigure the soft PVCs associated with all interfaces.
Assign a (nondefault) address to the interfaces.
Configuring Cisco Routers for Use with IDSL
If you wish to use a Cisco router for an IDSL application and the router is running a Cisco IOS release earlier than Release 12.1, you must configure the ISDN switch type. If you do not configure the ISDN switch type on the Cisco router, the router's BRI interface might not come back up after the IDSL line goes down and comes back up.
To prevent this problem from occurring, execute the isdn switch-type basic-ni command in global configuration mode on the router.
This problem does not occur if the Cisco router is running Cisco IOS Release 12.1 or later.
Assigning VPI Values to Shaped VP Tunnels
This release supports the full range of VPI values: 0 to 255. However, if you configure VP tunnels with traffic shaping, you can use only 32 VPIs out of that range. If you have not yet assigned any VPIs, all values from 0 to 255 are available. Once you start assigning VPIs, however, the assigned VPIs limit the VPIs that remain. (You assign VPIs using the atm pvp or atm pvc command.)
After a particular VPI value is assigned to a shaped VP tunnel, every 32nd VPI value above and below the first one is eliminated—that is, the original value modulo 32. For example, if you assign VPI 94 to a shaped VP tunnel, the following VPI values become unavailable for any purpose: 30, 62, 126, 158, 190, and 222.
To avoid problems, choose a block of 32 consecutive VPI values (for example, 0 to 31 or 101 to 132). The software rejects invalid VPI values.
Installing Multiple Cisco 6160 DSLAMs in an Equipment Rack
You can install multiple Cisco 6160 DSLAMs in a Telco equipment rack. A standard 7-foot equipment rack can house four Cisco 6160 DSLAMs, stacked one on top of another. This configuration maximizes the DSL density within a 7-foot rack. However, if space is available or you are interested in using any multiservice capabilities that the DSLAM might support in the future, we recommend that you install no more than three Cisco 6160 DSLAMs in a 7-foot rack. Leave a space of at least 2.5 rack units (4.375 inches, or 11.1 cm) beneath each DSLAM for future cable management use.
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.
Caveats describe unexpected behavior in Cisco IOS software releases. Caveat numbers and brief descriptions are listed in the following tables. For details about a particular caveat and for information on caveats in previous Cisco IOS releases that also apply to this release, go to Bug Toolkit at:
To access this location, you must have an account on Cisco.com. If you have forgotten or lost your account information, e-mail the Contact Database Administration group at email@example.com. If you do not have an account on Cisco.com, go to http://tools.cisco.com/RPF/register/register.do and follow the directions to set up an account.
Note If you have an account with Cisco.com, you can use Bug Navigator II to find caveats for a release. To reach Bug Navigator II, go to Cisco.com and click Login. Then go to Software Center > Cisco IOS Software > Cisco Bugtool Navigator II. Alternatively, you can go to:
For information on caveats in Cisco IOS Release 12.2, see Caveats for Cisco IOS Release 12.2, which lists severity 1 and 2 caveats and select severity 3 caveats for Cisco IOS Release 12.2. It is located on Cisco.com and the Documentation CD-ROM.
Resolved Caveats—Release 12.2(12)DA2
Table 4 lists the caveats resolved in Cisco IOS Release 12.2(12)DA2.
Resolved Caveats—Release 12.2(12)DA1
Table 5 lists the caveats resolved in Cisco IOS Release 12.2(12)DA1.
Open Caveats—Release 12.2(12)DA
Table 6 lists the open caveats in Cisco IOS Release 12.2(12)DA.
Resolved Caveats—Release 12.2(12)DA
Table 7 lists the caveats resolved in Cisco IOS Release 12.2(12)DA.
Open Caveats—Release 12.2(10)DA
All of the caveats listed in Table 8 are open in Cisco IOS Release 12.2(10)DA. This table lists only severity 1 and 2 caveats and some severity 3 caveats.
Resolved Caveats—Release 12.2(10)DA
The problems listed in Table 9 are fixed in Cisco IOS Release 12.2(10)DA.
Open Caveats—Release 12.2(7)DA
All open caveats in Cisco IOS Release 12.2(7)DA have been resolved.
Resolved Caveats—Release 12.2(7)DA
The problems listed in Table 10 are fixed in Cisco IOS Release 12.2(7)DA.
The software described in these release notes runs on several Cisco NI-2 DSLAM platforms, including the Cisco 6015, Cisco 6160, and Cisco 6260 DSLAMs.
A complete list of all DSL hardware product related documentation is available at the following URL:
A complete list of all DSL Cisco IOS product related documentation is available at the following URL:
In the Cisco ATM software manuals, look for information pertaining to the LightStream 1010, which uses the same software base as the Cisco NI-2 DSLAMs. ATM manuals are available at the following URL:
The following sections describe how to obtain documentation from Cisco Systems.
World Wide Web
You can access the most current Cisco documentation on the World Wide Web at the following sites:
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.
Cisco documentation is available in the following ways:
•Registered Cisco Direct Customers can order Cisco Product documentation from the Networking Products MarketPlace:
•Registered Cisco.com users can order the Documentation CD-ROM through the online Subscription Store:
•Nonregistered Cisco.com users can order documentation through a local account representative by calling Cisco corporate headquarters (California, USA) at 408 526-7208 or, in North America, by calling 800 553-NETS (6387).
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 firstname.lastname@example.org.
To submit your comments by mail, use the following address:
Attn. Document Resource Connection
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-9883
We appreciate your comments.
Obtaining Technical Assistance
Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain online documentation, troubleshooting tips, and sample configurations from online tools by using the Cisco Technical Assistance Center (TAC) Web Site. Cisco.com registered users have complete access to the technical support resources on the Cisco TAC Web Site.
Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information, networking solutions, services, programs, and resources at any time, from anywhere in the world.
Cisco.com is a highly integrated Internet application and a powerful, easy-to-use tool that provides a broad range of features and services to help you with these tasks:
•Streamline business processes and improve productivity
•Resolve technical issues with online support
•Download and test software packages
•Order Cisco learning materials and merchandise
•Register for online skill assessment, training, and certification programs
If you want to obtain customized information and service, you can self-register on Cisco.com. To access Cisco.com, go to this URL:
Technical Assistance Center
The Cisco Technical Assistance Center (TAC) is available to all customers who need technical assistance with a Cisco product, technology, or solution. Two levels of support are available: the Cisco TAC Web Site and the Cisco TAC Escalation Center.
Cisco TAC inquiries are categorized according to the urgency of the issue:
•Priority level 4 (P4)—You need information or assistance concerning Cisco product capabilities, product installation, or basic product configuration.
•Priority level 3 (P3)—Your network performance is degraded. Network functionality is noticeably impaired, but most business operations continue.
•Priority level 2 (P2)—Your production network is severely degraded, affecting significant aspects of business operations. No workaround is available.
•Priority level 1 (P1)—Your production network is down, and a critical impact to business operations will occur if service is not restored quickly. No workaround is available.
The Cisco TAC resource that you choose is based on the priority of the problem and the conditions of service contracts, when applicable.
Cisco TAC Web Site
You can use the Cisco TAC Web Site to resolve P3 and P4 issues yourself, saving both cost and time. The site provides around-the-clock access to online tools, knowledge bases, and software. To access the Cisco TAC Web Site, go to this URL:
All customers, partners, and resellers who have a valid Cisco service contract have complete access to the technical support resources on the Cisco TAC Web Site. The Cisco TAC Web Site requires a Cisco.com login ID and password. If you have a valid service contract but do not have a login ID or password, go to this URL to register:
If you are a Cisco.com registered user, and you cannot resolve your technical issues by using the Cisco TAC Web Site, you can open a case online by using the TAC Case Open tool at this URL:
If you have Internet access, we recommend that you open P3 and P4 cases through the Cisco TAC Web Site.
Cisco TAC Escalation Center
The Cisco TAC Escalation Center addresses priority level 1 or priority level 2 issues. These classifications are assigned when severe network degradation significantly impacts business operations. When you contact the TAC Escalation Center with a P1 or P2 problem, a Cisco TAC engineer automatically opens a case.
To obtain a directory of toll-free Cisco TAC telephone numbers for your country, go to this URL:
Before you call, check with your network operations center to determine the level of Cisco support services to which your company is entitled: for example, SMARTnet, SMARTnet Onsite, or Network Supported Accounts (NSA). When you call the center, have your service agreement number and your product serial number available.
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