NI-2 Card and APS Link Redundancy

Feature Overview

NI-2 Cold Redundancy

Automatic Protection Switching

Restrictions

Related Features and Technologies

NI-2 Card and APS Link Redundancy

This feature module describes the Cisco IOS support for NI-2 card cold redundancy (active/standby) and Synchronous Optical Network Automatic Protection Switching (SONET APS) on the Cisco 6130, Cisco 6160, and Cisco 6260 DSLAM systems. It includes information on new and modified commands.

This document includes the following sections:

Feature Overview

The NI-2 Card redundancy feature provides redundancy on the Cisco 6130, Cisco 6160, and Cisco 6260 DSLAM systems. This redundancy feature has two main components.

Recovery from failure on an NI-2 card lets the standby card take over if the active card fails.
Recovery from failure due to a cut fiber or the failure of an optical transmitter or receiver (SONET APS) lets the active NI-2 switch to the fiber interface on the standby NI-2.

NI-2 Cold Redundancy

On a system with two NI-2 cards of the same interface types (trunk and subtend), the NI-2 cold redundancy feature allows a standby NI-2 card to assume system operations if the active NI-2 card completely fails. The NI-2 card in slot 10 is called the primary card and the card in slot 11 is called the secondary card. Either card can be active or standby.

The standby NI-2 begins the boot process but does not process its configuration. While the standby unit is monitoring the state of the active unit, the active unit synchronizes configuration changes with the standby unit if it is configured to do so. This allows the standby unit to become active with the most recent configuration possible following a switchover. Configuration information could be lost during the switchover if configuration synchronization is disabled.

The switchover from one NI-2 to the other NI-2 does not cause a reset of the line cards. The active unit communicates line card information to the standby unit to decrease switchover time. When the switchover is complete, the object database on the newly active unit may not match the objects in the system, but this situation will correct itself during normal operation as the active unit discovers the new cards or discovers that cards have been removed.

Automatic Protection Switching

SONET APS provides recovery from a cut fiber or the failure of an optical transmitter or receiver for OC-3 interfaces on an NI-2 card. APS redundancy is available on OC-3c/2DS3 NI-2 card trunk interfaces and OC-3c/OC-3c NI-2 card trunk and subtend interfaces. The active interface switches over when a SONET failure condition (loss of signal or loss of frame) is detected.

When both primary and secondary fiber connections are cabled, the active NI-2 card transmits and receives identical data signals over both fiber connections and can switch the receive path between the two upon a fiber or OC-3c port failure.

APS fiber redundancy is nonrevertive. The NI-2 will switch back to the primary fiber only if manually forced through a CLI command or if a failure condition occurs on the secondary fiber. If both fibers are failed, the system will switch to the first good fiber that is available.

Restrictions

Cold redundancy is redundancy in which the standby unit does not completely mirror the state of the active unit. With cold redundancy, the standby unit loses transient state information and must process its configuration during the switchover, which may lead to a period of data loss.

Cisco recommends testing the redundancy feature in the local test environment before placing the unit in production.

Related Features and Technologies

If your SONET port has hardware equipped with controllable transmitters (part number 800-05179-06 or 800-05180-06), automatic laser control permits Y-cable redundancy on SONET ports. This mode of operation is identical to normal SONET APS mode except that the standby SONET link optical transmitter is turned off.

Supported Platforms

Table 1 lists the NI-2 cards and compatible chassis that support cold redundancy.

Table 1: Redundant NI-2 Cards and Chassis Compatibility

NI-2 Card	Cisco 6130	Cisco 6160	Cisco 6260
DS3/2DS3	Yes	Yes	Yes¹
OC-3c/OC-3c SMF²^, ³	Yes	Yes	Yes⁴
OC-3c/OC-3c MMF^{3, ⁵}	Yes	Yes	Yes
OC-3c/2DS3 SMF²^,⁶	No	Yes	No
OC-3c/2DS3 MMF^5, ⁶	No	Yes	No
DS3+T1/E1 IMA⁷	No	Yes⁸	No

¹When the DS3/2DS3 NI-2 card and the E3 I/O module are installed in the Cisco 6260 chassis, the system assumes E3 functionality
² SMF = single-mode fiber
³ APS provides link redundancy on the trunk and subtended interfaces
⁴ When the OC-3c/OC-3c NI-2 card and the OC-3c I/O module are installed in the Cisco 6260 chassis, the system assumes OC-3c functionality
⁵ MMF = multimode fiber
⁶ APS provides link redundancy only on the OC-3c trunk interface
⁷IMA = inverse multiplexing over ATM
⁸Use only with the DS3/2DS3+8T1 IMA system I/O card (part number 6160-1-I/O-2=)

Ensure that the following product revisions are installed on your system:

Cisco NI-2 card, daughterboard item number 73-3952-05 rev. AO or later. Use the Cisco IOS command show hardware slot 10 or show hardware slot 11 to determine the currently installed NI-2 card daughterboard item number and revision.
For the Cisco 6260 chassis, 6260 backplane item number 73-3999-05 rev. AO or later. Use the Cisco IOS command show hardware chassis to determine the 6260 backplane item number and revision.

Supported Standards, MIBs, and RFCs

Standards

Automatic protection switching specifically as it pertains to SONET as described in Bellcore GR-253-CORE, Issue 2 SONET Transport Systems: Common Criteria Network Element Architectural Features.

MIBs

No MIBS were added or modified for this feature. To obtain lists of MIBs supported by platform and Cisco IOS release and to download MIB modules, go to the Cisco MIB web site on Cisco Connection Online (CCO) at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.

RFCs

No RFCs are associated with this feature.

Prerequisites

To properly configure and activate redundancy, ensure that you are running Cisco IOS Release 12.1(7)DA or a later version of IOS on one of the Supported Platforms. You must install a second NI-2 card (must be the same type as the primary NI-2 card).

Configuration Tasks

Perform the task in the "Configure the NI-2 Cards for File Synchronization" section to configure NI-2 cards and SONET ports.

Configure the NI-2 Cards for File Synchronization

NI-2 cold redundancy supports autosynchronization of the primary and secondary NI-2 card file systems, but you must manually synchronize the flash files and bootflash files before you can enable autosynchronization.

To manually synchronize the flash and bootflash on the NI-2 cards, complete the following steps:

	Command	Purpose
Step 1	`DSLAM>enable`	Enter privileged EXEC mode.
Step 2	`DSLAM#secondary sync flash`	Manually synchronize the flash files.
Step 3	`DSLAM#secondary sync bootflash`	Manually synchronize the bootflash files.

After you manually synchronize the flash and bootflash, configure the NI-2 cards for automatic synchronization. To enable autosynchronization of the primary and secondary NI-2 cards, complete the following steps:

	Command	Purpose
Step 1	`DSLAM#configure terminal`	Enter global configuration mode.
Step 2	`DSLAM(config)#auto-sync`	Enter auto-sync submode.
Step 3	`DSLAM(config-auto-sync)#flash`	Autosynchronize the flash files.¹
Step 4	`DSLAM(config-auto-sync)#bootflash`	Autosynchronize the bootflash files.¹
Step 5	`DSLAM(config-auto-sync)#config`	Autosynchronize the startup configuration file (default).
Step 6	`DSLAM(config-auto-sync)#running-config`	Autosynchronize the running configuration file (default).
Step 7	`DSLAM(config-auto-sync)#exit`	Exit from auto-sync submode.

¹ You will not be able to perform this operation until you manually synchronize the file systems.

Verifying File Synchronization

Use the show running-configuration command to verify that you entered the commands correctly. Use the dir flash, dir secondary-flash, dir bootflash, and dir secondary-bootflash commands to verify that the files synchronized properly.

Note Because the config and running-config synchronizations are enabled by default, they will not show up in the running configuration.

Troubleshooting Tips

Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools.

For Cisco.com registered users, additional troubleshooting tools are available from the TAC website. To obtain troubleshooting help, go to the Cisco Troubleshooting Assistant web site on Cisco Connection Online (CCO) at:

http://www.cisco.com/kobayashi/support/tac/tsa/dslstep.html

Also see the "Monitoring Redundancy States" section.

Monitoring Redundancy States

Use the show redundancy states command to display the current redundancy states of the NI-2s. See the "show redundancy states" section for more detailed information.

Use the show aps command to display the APS status of each SONET port on both NI-2 cards. See the "show aps" section for more detailed information.

Configuration Examples

This section provides output from the show running-configuration command.

DSLAM#show running configuration

Building configuration...
 
Current configuration : 1917 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname DSLAM
!
slot 7 ATUC-4FLEXIDMT
slot 10 NI-2-155MM-155MM
slot 11 NI-2-155MM-155MM
slot 34 ITUC-1-8IDSL
enable password test
!
!dsl-profile default
network-clock-select 1 ATM0/1
redundancy
auto-sync
 flash
 bootflash
ip subnet-zero
ip host-routing
no ip finger
no ip domain-lookup
ip host spur 123.45.678.91
ip domain-name cisco.com
ip name-server 123.45.678.92
ip name-server 123.45.6.789
!
no atm oam intercept end-to-end
atm address 47.0091.8100.0000.0030.b690.ac01.0030.b690.ac01.00
atm address 47.0091.8100.0000.00b0.c2ff.6001.00b0.c2ff.6001.00
atm router pnni
 no aesa embedded-number left-justified
 node 1 level 56 lowest
  redistribute atm-static
!
icm size 4194304
!
interface ATM0/0
 no ip address
 atm cac service-category abr deny
 atm maxvp-number 0
 atm maxvc-number 4096
 atm maxvci-bits 12
!interface ATM7/3
 no ip address
 no atm ilmi-keepalive
...

Command Reference

This section documents new or modified commands. All other commands used with this feature are documented in the Command Reference for Cisco DSLAMs with NI-2.

aps clear

To clear outstanding APS priority requests, use the aps clear privileged EXEC command.

aps clear atm interface

Syntax Description


atm interface	Specifies the ATM interface for which you want all APS priority requests cleared.

Defaults

No default behavior or values.

Command Modes

Privileged EXEC.

Command History


Release	Modification
IOS 12.1(7)DA	This command was introduced.

Usage Guidelines

The aps clear EXEC command allows you to remove all of the APS priority requests on the named ATM interface.

Note This command works only on SONET interfaces in redundant configurations.

Examples

The following example clears outstanding APS priority requests on interface atm 0/1:

DSLAM>enable

DSLAM#aps clear atm 0/1

Related Commands


Command	Description
aps force	Force a switchover to the specified fiber regardless of the failure state.
aps lockout	Prevent the protection fiber from being the active fiber and from being switched to by manual, automatic, and forced switchovers.
aps manual	Force a switch to the specified fiber only if the fiber that is being switched to is not in a failed state.
show aps	Display the APS status of each SONET port on both NI-2 cards.
show controllers	Display information on working and protection fibers.

aps force

To force a switchover to the specified fiber regardless of the failure state, use the aps force privileged EXEC command. To disable the forced switchover, use the aps clear command.

aps force atm interface from [protection | working]

Syntax Description


atm interface	Specify the ATM interface for which you want to force the switchover.
protection	The fiber that is local to the NI-2 card in slot 11.
working	The fiber that is local to the NI-2 card in slot 10.

Defaults

No default behavior or values.

Command Modes

Privileged EXEC.

Command History


Release	Modification
IOS 12.1(7)DA	This command was introduced.

Usage Guidelines

Force is defined as the second highest APS request priority level. The aps force command does not persist over a system restart. The request succeeds if no higher priority request is posted. This command forces a switch to the specified fiber regardless of the failure state of the fiber. See Usage Guidelines in the "show aps" section for information on request priority levels.

Note Note that the working fiber is local to the NI-2 card in slot 10 and the protection fiber is local to the NI-2 card in slot 11.

Examples

The following example forces a switch on interface atm 0/2 from the working fiber to the protection fiber.

DSLAM>enable

DSLAM#aps force atm 0/2 from working

Related Commands


Command	Description
aps clear	Clear outstanding APS priority requests.
aps lockout	Prevent the protection fiber from being the active fiber and from being switched to by manual, automatic, and forced switchovers.
aps manual	Force a switch to the specified fiber only if the fiber that is being switched to is not in a failed state.
show aps	Display the APS status of each SONET port on both NI-2 cards.
show controllers	Display information on working and protection fibers.

aps lockout

To prevent the protection fiber from being the active fiber and from being switched to by manual, automatic, and forced switchovers, use the aps lockout privileged EXEC command. To disable aps lockout, use the aps clear command.

aps lockout atm interface

Syntax Description


atm interface	Specify the ATM interface for which you want to lockout the switchover.

Defaults

No default behavior or values.

Command Modes

Privileged EXEC.

Command History


Release	Modification
IOS 12.1(7)DA	This command was introduced.

Usage Guidelines

Lockout is defined as the highest APS request priority level. The aps lockout command does not persist over a system restart. When the protection fiber is locked out, only the working fiber is used for the specified interface. See Usage Guidelines in the "show aps" section for information on request priority levels.

Note If the working fiber is down, the SONET payload will not be received until you clear this command and the protection fiber is up.

Examples

The following example prevents the protection fiber from being the active fiber and from being switched to by manual, automatic, and forced switchovers on interface atm 0/1:

DSLAM>enable

DSLAM#aps lockout atm 0/1

Related Commands


Command	Description
aps clear	Clear outstanding APS priority requests.
aps force	Force a switchover to the specified fiber regardless of the failure state.
aps manual	Force a switch to the specified fiber only if the fiber that is being switched to is not in a failed state.
show aps	Display the APS status of each SONET port on both NI-2 cards.
show controllers	Display information on working and protection fibers.

aps manual

To cause a switchover from the specified fiber to a fiber that is not in a failed state, use the aps manual privileged EXEC command. To clear the switchover request, use the aps clear atm command.

aps manual atm interface from [protection | working]

Syntax Description


atm interface	Specify the ATM interface from which you want to switch.
protection	The fiber that is local to the NI-2 card in slot 11.
working	The fiber that is local to the NI-2 card in slot 10.

Defaults

No default behavior or values.

Command Modes

Privileged EXEC.

Command History


Release	Modification
IOS 12.1(7)DA	This command was introduced.

Usage Guidelines

Manual is the third highest APS request priority level. The request succeeds if no higher priority request is posted. The aps manual command does not persist over a system restart. The atm interface named in the command is the one from which you want to switch. See Usage Guidelines in the "show aps" section for information on request priority levels.

Examples

The following example forces a switch from the atm 0/1 working fiber to the atm0/1 protection fiber:

DSLAM>enable

DSLAM#aps manual atm 0/1 from working

Related Commands


Command	Description
aps clear	Clear outstanding APS priority requests.
aps force	Force a switchover to the specified fiber regardless of the failure state.
aps lockout	Prevent the protection fiber from being the active fiber and from being switched to by manual, automatic, and forced switchovers.
show aps	Display the APS status of each SONET port on both NI-2 cards.
show controllers	Display information on working and protection fibers.

auto-sync

To enter the auto-sync submode for automatically synchronizing the configuration between the Cisco primary and secondary redundant NI-2s, use the auto-sync global configuration command.

auto-sync bootflash

auto-sync config

auto-sync exit

auto-sync flash

auto-sync running-config

Syntax Description


bootflash	Automatically synchronize the bootflash.
config	Automatically synchronize the startup configuration.
exit	Exit the auto-sync configuration submode.
flash	Automatically synchronize the flash.
running-config	Automatically synchronize the running configuration file.

Defaults

auto-sync config
auto-sync running-config

Command Modes

Auto-sync configuration submode.

Command History


Release	Modification
IOS 12.1(7)DA	This command was introduced.

Usage Guidelines

The auto-sync config and auto-sync running-config global configuration commands are enabled by default. You need to use these commands only if you disabled them.

You must also manually synchronize the flash files and bootflash files before you can enable autosynchronization (see the "Configure the NI-2 Cards for File Synchronization" section for further information). Otherwise, when operation changes from the primary to the secondary device, the operation of the DSLAM might change if the software versions differ from one NI-2 to the other.

Examples

The following example enables autosynchronization of the bootflash files:

DSLAM#configure terminal

DSLAM (config)#auto-sync

DSLAM (config-auto-sync)#bootflash

Related Commands


Command	Description
dir bootflash	Display the bootflash files for the primary NI-2 card.
dir flash	Display the flash files for the primary NI-2 card.
dir secondary-bootflash	Display the bootflash files for the secondary NI-2 card.
dir secondary-flash	Display the flash files for the secondary NI-2 card.
show running configuration	Display running configuration.

clock source

To select a transmit clock source for an atm interface, use the clock source interface configuration command. To return the clock source to the default, use the no form of this command.

clock source {loop-timed | network derived} [protection | working | <cr>]

Syntax Description


loop-timed	The transmit clock is derived from the local oscillator on the atm interface.
network derived	The transmit clock is derived from the system clock specified at highest priority when you use the network-clock-select global configuration command.
protection	The fiber that is local to the NI-2 card in slot 11.
working	The fiber that is local to the NI-2 card in slot 10.
<cr>	Both protection and working fibers.

Defaults

The clock source is network-derived by default (clock source network-derived).

Command Modes

Interface configuration.

Command History


Release	Modification
12.1(4)DA	This command was introduced.
IOS 12.1(7)DA	The keywords working and protection were added.

Examples

The following example shows how to enable the loop-timed clocking mode on the protection fiber on atm 0/2:

DSLAM>enable

DSLAM#configure terminal

DSLAM(config)#interface atm 0/2

DSLAM(config-if)#clock source loop-timed protection

Related Commands


Command	Description
show controllers	Display information on working and protection fibers.
show network-clocks	Display the local clock and the peer clock source.

loopback

To enable a loopback on a port, use the loopback interface configuration command. To disable loopback, use the no form of this command.

loopback [diagnostic | line] [protection | working | <cr>]

Syntax Description


diagnostic	Transmit data is looped to receive data at the physical layer.
line	The external receive signal is looped to transmit at the physical layer.
protection	The fiber that is local to the NI-2 card in slot 11.
working	The fiber that is local to the NI-2 card in slot 10.
<cr>	Both protection and working fibers.

Defaults

The default is no loopback.

Command Modes

Interface configuration.

Command History


Release	Modification
IOS 12.0(5)	This command was introduced.
IOS 12.1(7)DA	The keywords working and protection were added.

Usage Guidelines

The working and protection keywords are only available when you are configuring loopback on a SONET port.

Examples

The following example enables a loopback on atm 0/1, on the fiber local to the NI-2 card in slot 11:

DSLAM>enable

DSLAM#configure terminal

DSLAM(config)#interface atm 0/1

DSLAM(config-if)#loopback diagnostic protection

Related Commands


Command	Description
show controllers	Display information on working and protection fibers.

redundancy

To enter the redundancy submode for specifying redundancy on NI-2s, use the redundancy global configuration command.

redundancy split-mode

Syntax Description


split-mode	Logically disconnect the secondary unit from the primary unit. This command is useful when performing software upgrades and other maintenance procedures. Use the no form of the command to reconnect the secondary unit and reset the standby unit.

Defaults

The default is no split-mode.

Command Modes

Redundancy submode.

Command History


Release	Modification
IOS 12.1(7)DA	This command was introduced.

Usage Guidelines

If you use the redundancy command, you enter redundancy privileged EXEC submode (config-red). Within this submode, you can configure the redundancy-specific parameter for putting the system in split mode. To exit redundancy privileged EXEC submode, type exit.

If you disable split mode, the standby card is reloaded.

Examples

The following example puts the system into simplex mode:

DSLAM>enable

DSLAM#configure terminal

DSLAM(Config)#redundancy

DSLAM(config-red)#split-mode

This command will place the system in SIMPLEX mode. [confirm] y 

Secondary auto-sync disabled due to split-mode

Related Commands


Command	Description
show redundancy states	Display the state of the primary and secondary NI-2s, and identify which NI-2 is active.

redundancy reload-peer

To reload the standby NI-2 card, use the redundancy reload-peer privileged EXEC command.

redundancy reload-peer

Syntax Description

This command has no argument or keywords.

Defaults

No default behavior or values.

Command Modes

Privileged EXEC.

Command History


Release	Modification
IOS 12.1(7)DA	This command was introduced.

Usage Guidelines

This command reloads the standby NI-2 card.

Examples

The following example reloads the standby NI-2 card:

DSLAM>enable

DSLAM#redundancy reload-peer

Related Commands


Command	Description
redundancy reload-shelf	Reload all cards in the chassis.
redundancy switch-activity	Switch over manually from the active NI-2 card to the standby NI-2 card.
show redundancy states	Display the state of the primary and secondary NI-2s, and identify which NI-2 is active.

redundancy reload-shelf

To reload all cards in the chassis, use the redundancy reload-shelf privileged EXEC command.

redundancy reload-shelf

Syntax Description

This command has no argument or keywords.

Defaults

No default behavior or values.

Command Modes

Privileged EXEC.

Command History


Release	Modification
IOS 12.1(7)DA	This command was introduced.

Usage Guidelines

This command reloads all cards in the chassis. The primary NI-2 (NI-2 in slot 10) will always come up as active in a race condition.

The following example reloads all cards in the chassis:

DSLAM>enable

DSLAM#redundancy reload-shelf

Related Commands


Command	Description
redundancy reload-peer	Reload the standby NI-2 card.
redundancy switch-activity	Switch over manually from the active NI-2 card to the standby NI-2 card.
show redundancy states	Display the state of the primary and secondary NI-2s, and identify which NI-2 is active.

redundancy switch-activity

To switch over manually from the active NI-2 card to the standby NI-2 card, use the redundancy switch-activity privileged EXEC command.

redundancy switch-activity

Syntax Description

This command has no argument or keywords.

Defaults

No default behavior or values.

Command Modes

Privileged EXEC.

Command History


Release	Modification
IOS 12.1(7)DA	This command was introduced.

Usage Guidelines

This command causes a manual switchover of activity to occur.

Examples

The following example causes a manual switchover from the active NI-2 card to the standby NI-2 card:

DSLAM>enable

DSLAM#redundancy switch-activity

This will reload the active unit and force a switch of activity. [confirm] y

Related Commands


Command	Description
redundancy reload-peer	Reload the standby NI-2 card.
redundancy reload-shelf	Reload all cards.
show redundancy states	Display the state of the primary and secondary NI-2s, and identify which NI-2 is active.

scrambling

To configure scrambling on an interface, use the scrambling interface configuration command. To restore the default value, use the no form of this command.

scrambling [cell-payload | sts-stream] [protection | working | <cr>]

Syntax Description


cell-payload	The 48-byte portion of an ATM cell carrying user data.
sts-stream	The portion of the STS frame carrying user data.
protection	The fiber that is local to the NI-2 card in slot 11.
working	The fiber that is local to the NI-2 card in slot 10.
<cr>	Both protection and working fibers.

Defaults

No default behavior or values.

Command Modes

Interface configuration.

Command History


Release	Modification
12.1(4)DA	This command was introduced.
IOS 12.1(7)DA	The keywords protection and working were added.

Usage Guidelines

The scrambling type must match on both sides of a link.

Examples

The following example uses the scrambling command to enable scrambling on the specified interface:

DSLAM>enable

DSLAM#configure terminal

DSLAM(config)#interface atm 0/1

DSLAM(config-if)#scrambling cell-payload protection

Related Commands


Command	Description
show controllers	Display information on working and protection fibers.

secondary sync bootflash

To manually synchronize the bootflash files from the active to the standby NI-2, use the secondary sync bootflash privileged EXEC command.

secondary sync bootflash

Syntax Description

This command has no argument or keywords.

Defaults

No default behavior or values.

Command Modes

Privileged EXEC.

Command History


Release	Modification
IOS 12.1(7)DA	This command was introduced.

Usage Guidelines

You use this command to synchronize the bootflash files between the active and the standby NI-2.

Examples

The following example synchronizes the bootflash files between the active and the standby NI-2:

DSLAM>enable

DSLAM#secondary sync bootflash

Related Commands


Command	Description
dir bootflash	Display the bootflash files for the active NI-2 card.
dir secondary-bootflash	Display the bootflash files for the standby NI-2 card.
secondary sync config	Synchronize the startup configuration from the active to the standby NI-2.
secondary sync flash	Synchronize the flash files from the active to the standby NI-2.
secondary sync running-config	Synchronize the running configuration from the active to the standby NI-2.

secondary sync config

To synchronize the startup configuration from the active to the standby NI-2, use the secondary sync config privileged EXEC command.

secondary sync config

Syntax Description

This command has no argument or keywords.

Defaults

No default behavior or values.

Command Modes

Privileged EXEC.

Command History


Release	Modification
IOS 12.1(7)DA	This command was introduced.

Usage Guidelines

You use this command to copy the startup configuration from the active to the standby NI-2.

Examples

The following example copies the startup configuration from the active to the standby NI-2:

DSLAM>enable

DSLAM#secondary sync config

Related Commands


Command	Description
secondary sync bootflash	Synchronize the bootflash files from the active to the standby NI-2.
secondary sync flash	Synchronize the flash files from the active to the standby NI-2.
secondary sync running-config	Synchronize the running configuration from the active to the standby NI-2.

secondary sync flash

To synchronize the flash files from the active to the standby NI-2, use the secondary sync flash privileged EXEC command.

secondary sync flash

Syntax Description

This command has no argument or keywords.

Defaults

No default behavior or values.

Command Modes

Privileged EXEC.

Command History


Release	Modification
IOS 12.1(7)DA	This command was introduced.

Usage Guidelines

You use this command to synchronize the flash files between the active and the standby NI-2.

Examples

The following example synchronizes the flash files between the active and the standby NI-2:

DSLAM>enable

DSLAM#secondary sync flash

Related Commands


Command	Description
dir flash	Display the flash files for the active NI-2 card.
dir secondary-flash	Display the flash files for the standby NI-2 card.
secondary sync bootflash	Synchronize the bootflash files from the active to the standby NI-2.
secondary sync config	Synchronize the startup configuration from the active to the standby NI-2.
secondary sync running-config	Synchronize the running configuration from the active to the standby NI-2.

secondary sync running-config

To synchronize the running configuration from the active to the standby NI-2, use the secondary sync running-config privileged EXEC command.

secondary sync running-config

Syntax Description

This command has no argument or keywords.

Defaults

No default behavior or values.

Command Modes

Privileged EXEC.

Command History


Release	Modification
IOS 12.1(7)DA	This command was introduced.

Usage Guidelines

You use this command to copy the running configuration from the active to the standby NI-2.

Examples

The following example copies the running configuration from the active to the standby NI-2:

DSLAM>enable

DSLAM#secondary sync running-config

Related Commands


Command	Description
secondary sync bootflash	Synchronize the bootflash files from the active to the standby NI-2.
secondary sync config	Synchronize the startup configuration from the active to the standby NI-2.
secondary sync flash	Synchronize the flash files from the active to the standby NI-2.

show aps

To display the APS status of each SONET port on both NI-2 cards, use the show aps privileged EXEC command.

show aps [data]

Syntax Description


data	Display more detailed information on the APS status of each SONET port.

Defaults

No default behavior or values.

Command Modes

Privileged EXEC.

Command History


Release	Modification
IOS 12.1(7)DA	This command was introduced.

Usage Guidelines

This command displays the APS status of each SONET port. The Channel stat field displays the status of APS priority requests and failures. The priority-request commands, shown from highest to lowest level are:

1. aps lockout

2. aps force

3. Signal fail

4. aps manual

A higher priority command will be executed even after a lower priority command is issued. However, a command of equal or lesser priority will not be executed until an aps clear command is issued.

Table 2 describes the fields shown in the display:

Table 2: show aps Field Description

Field	Description
APS	This interface is operating in APS mode (default configuration).
Lin	This interface is operating in linear mode (default configuration).
NR	This interface is operating in nonrevertive mode (default configuration).
Uni	This interface is operating in unidirectional mode (default configuration).
Failure channel:	The inactive channel is either the working or protection channel.
Active channel:	The active channel is either the working or protection channel.
Channel stat:	Signal Fail = failure on either of the fibers. Forced Switch = aps force command issued. Manual Switch = aps manual command issued. Lockout = aps lockout command issued. Good = aps clear command issued and both signals are good.
Port stat:	The signal/alarm status of the interface = Good, LOS, LOF, RDI, AIS, OOCD, LOP, APS mode mismatch, invalid (interface down).

Examples

The following example is sample output from the show aps privileged EXEC command.

DSLAM>enable
DSLAM#show aps

ATM0/1: APS Lin NR Uni, Failure channel: Protection
        Active Channel: Working, Channel stat: Good
        Port stat (w,p): (Good Signal, Good Signal)
 
ATM0/2: APS Lin NR Uni, Failure channel: Protection
        Active Channel: Working, Channel stat: Good
        Port stat (w,p): (Good Signal, Good Signal)

The following example is sample output from the show aps data privileged EXEC command.

DSLAM>enable

DSLAM#show aps data

ApsState struct:
apsEnabled         = TRUE
localLink          = PROTECTION
peerLink           = WORKING
peerPresent        = FALSE
peerCommUp         = FALSE
initialSwitchStateMsgReceived         = FALSE
PORT: P1
linkExists     = TRUE
auto-laser-control ON
local laser OFF
peer laser ON
activeLink     = WORKING
lockout        = FALSE
apsCommand     = 0
statsRecvd         = FALSE
ifIndex            = 0
currentState for WORKING          = DOWN
currentApsPortEvent for WORKING   = -1
currentState for PROTECTION          = DOWN
currentApsPortEvent for PROTECTION   = 12
PORT: P2
linkExists     = TRUE
auto-laser-control OFF
local laser ON
peer laser ON
activeLink     = PROTECTION
lockout        = FALSE
apsCommand     = 0
statsRecvd         = FALSE
ifIndex            = 0
currentState for WORKING          = DOWN
currentApsPortEvent for WORKING   = -1
currentState for PROTECTION          = AVAILABLE
currentApsPortEvent for PROTECTION   = 0

Related Commands


Command	Description
show controllers	Display information on working and protection fibers.

show redundancy states

To display the state of the primary and secondary NI-2s, use the show redundancy states privileged EXEC command.

show redundancy states

Syntax Description

This command has no argument or keywords.

Defaults

No default behavior or values.

Command Modes

Privileged EXEC.

Command History


Release	Modification
IOS 12.1(7)DA	This command was introduced.

Usage Guidelines

This command displays the state of the primary and secondary NI-2s and identifies which NI-2 is active.

Table 3 describes the fields shown in the display:

Table 3: show redundancy states Field Description

Field	Description
`my state`	The redundancy state of the active unit.
`peer state`	The redundancy state of the standby unit.
`Mode`	Simplex means that the standby unit is not installed or not completely up. Duplex means that the standby unit is installed and functional.
`Unit`	The active unit. Primary is slot 10. Secondary is slot 11.
`Split Mode`	Enabled means that the secondary unit is logically disconnected from the active unit.
`Manual Swact`	Enabled means that you can manually switch from one unit toanother.
`Communications`	The state of the communication link between the cards.
`client count`	The number of IOS features that have registered for redundancy services. This field is not user-configurable.
`countclient_notification_TMR`	The amount of time that IOS features registered for redundancy services have to respond to redundancy state changes. This field is not user-configurable.
`keep_alive TMR keep_alive count`	The amount of time that the active card waits between sending each keepalive. This field is not user-configurable.
`keep_alive count`	The number of keepalive messages that have been sent but have not yet received replies. This number should be 1 or 0. The count is cleared when a reply is received, so it only increments when consecutive keepalives do not receive replies. This field is not user-configurable.
`keep_alive threshold`	The number of keepalive messages that can be dropped before the active card decides that the standby card has failed and tries to reset it. This field is not user-configurable.

Examples

The following example is sample output from the show redundancy states command:

DSLAM>enable

DSLAM#show redundancy states

my state =11 -ACTIVE 
peer state = 8 -STANDBY READY
Mode = Duplex
Unit = Preferred Secondary
Split Mode = Disabled
Manual Swact = Enabled
Communications = Up
client count = 7
client_notification_TMR = 30000 milliseconds
keep_alive TMR = 2000 milliseconds
keep_alive count = 1 
keep_alive threshold = 7

Related Commands


Command	Description
show aps	Display the APS states of each SONET port on both NI-2 cards.
show controllers	Display information on working and protection fibers.

sonet

To modify the framing mode for the interface, use the sonet interface configuration command.

sonet [stm-1 | sts-3c] [protection | working | <cr>]

Syntax Description


stm-1	Synchronous transfer mode-1.
sts-3c	Synchronous transport signal-3.
protection	The fiber that is local to the NI-2 card in slot 11.
working	The fiber that is local to the NI-2 card in slot 10.
<cr>	Both protection and working fibers.

Defaults

No default behavior or values.

Command Modes

Interface configuration.

Command History


Release	Modification
IOS 12.1(7)DA	This command was introduced.

Examples

The following example sets the framing mode to stm-1 on both the working and protection fibers:

DSLAM>enable

DSLAM#configure terminal

DSLAM(config)#interface atm 0/1

DSLAM(config-if)#sonet stm-1

Related Commands


Command	Description
show controllers	Display information on working and protection fibers.

Glossary

A
active unit	The unit or element that is currently providing service. Either the primary or secondary element may be active.
APS	automatic protection switching. SONET switching mechanism that routes traffic from working lines to protect them in case of a cut fiber cut.
Asynchronous Transfer Mode	See ATM.
ATM	Asynchronous Transfer Mode. A cell-based data transfer technique in which channel demand determines packet allocation. ATM offers fast packet technology, real time, demand led switching for efficient use of network resources.
Automatic Protection Switching	See APS.

C
Card Redundancy	Redundancy provided on the entire NI-2 card. When the active card fails, the standby card picks up execution.
CCO	Cisco Connection Online.
Cisco Connection Online	See CCO.
CLI	Command Line Interface.
cold redundancy	Redundancy in which the standby unit does not completely mirror the state of the active unit.

D
DS3	Digital signal level 3. Framing specification used for transmitting digital signals at 44.736 Mbps on a T3 facility.
DSLAM	Digital Subscriber Line Access Multiplexer. Concentrates and multiplexes digital subscriber line signals at the telephone service provider location to the broadband wide area network.

E
EHSA	Enhanced High System Availability

L
Link Redundancy	Redundancy on the physical link. Link redundancy protects against a failure on the physical link, and is not tied directly to NI-2 card redundancy. A switch between the receive port on the active card and the standby card does not require a full NI-2 card switchover.

O
OC-3	Optical Carrier Level 3. Physical protocol, defined for SONET optical signal transmissions.
Optical Carrier Level 3	See OC-3.

P
peer unit	The peer unit is the standby unit, whether primary or secondary.
port	The abstraction used by Internet transport protocols to distinguish among multiple simultaneous connections to a single destination host. A single termination point on one of the multiport modules (POTS, LIM, or ATU-C).
primary	The NI-2 that assumes the active role if there is contention during startup. This is defined to be the card with the lower slot number (slot 10 in this case).
protection fiber	The fiber that is local to the NI-2 card in slot 11 on a chassis.

S
secondary	The NI-2 that assumes the standby role if there is contention during startup. This is defined to be the NI-2 with the higher slot number (slot 11 in this case).
slot	A numbered location within a chassis capable of housing a module.
SMB	System Management Bus. A serial bus used for interprocessor communications between cards in a chassis.
SMB-R	The SMB used for NI to NI communications. Also referred to as SMB-0
split mode	A mode in redundancy where the standby unit is present (duplex) but logically disconnected from the active unit.
standby unit	The unit or element that is not currently providing service. Note either the primary or secondary element maybe the standby.
System Management Bus	See SMB.

W
Working fiber	The fiber that is local to NI-2 card in slot 10.

Table of Contents

NI-2 Card and APS Link Redundancy