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This feature module details the Cisco 7500 Single Line Card Reload feature. This feature module contains the following sections:
Before the introduction of the Cisco 7500 Single Line Card Reload feature, the only method of correcting a line card hardware failure or a severe software error for one line card on a Cisco 7500 series router required the execution of a Cbus Complex, a process that reloaded every line card on the network backplane. The time taken to complete the Cbus Complex was often inconvenient, and no network traffic could be routed or switched during the Cbus Complex process.
The Cisco 7500 Single Line Card Reload feature allows users to correct a line card failure on a Cisco 7500 series router by automatically reloading the microcode on a failed line card. During the single line card reload process, all physical lines and routing protocols on the other line cards of the network backplane remain active. A single line card reload is also significantly faster than the Cbus Complex process.
Improved Line Card Recovery Time
The time required to correct a line card hardware failure for one line card is significantly improved when the Cisco 7500 Single Line Card Reload feature is enabled. The entire system, which now only reloads one line card instead of every line card, also experiences a dramatic improvement in recovery time.
Network Traffic Flow Improvements
Because the Cisco 7500 Single Line Card Reload feature only reloads the line card with the hardware failure rather than all of the line cards on the Cisco 7500 network backplane, the active line cards can continue to forward network traffic.
This feature is supported on VIP-enabled and non-VIP-enabled Cisco 7500 series routers.
Standards
None
MIBs
None
For descriptions of supported MIBs and how to use MIBs, see the Cisco MIB web site on CCO at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.
RFCs
None
See the following sections for configuration tasks for the Cisco 7500 Single Line Card Reload feature. Each task in the list indicates if the task is optional or required.
To enable the Cisco 7500 Single Line Card Reloading feature, enter the service single-slot-reload-enable configuration command on the Cisco 7500 series router.
| Command | Purpose |
|---|---|
Router(config)#service single-slot-reload-enable
| Enables single line card reloading for all of the line cards in the Cisco 7500 series router. |
The Cisco 7500 Single Line Card Reloading feature is disabled by default. Therefore, the process for disabling the Cisco 7500 Single Line Card Reloading feature is only necessary if the Cisco 7500 Single Line Card Reloading feature has been enabled by the user on the Cisco 7500 series router.
To disable the Cisco 7500 Single Line Card feature, enter the no service single-slot-reload-enable configuration command on the Cisco 7500 series router.
| Command | Purpose |
|---|---|
Router(config)#no service single-slot-reload-enable
| Disables single line card reloading for all of the line cards in the Cisco 7500 series router. |
Use the show running-config command to verify that single line card reloading has been successfully enabled on the Cisco 7500 series router. If the "service single-slot-reload-enable" line appears in the command output, Cisco 7500 Single Line Card Reloading is enabled. If this line does not appear in the command output, Cisco 7500 Single Line Card Reloading is disabled.
The debug oir command is used to debug the online insertion and removal (OIR) feature (which is also known as hot-swapping or power-on servicing). The debug oir command is often useful in debugging problems related to OIR, include single line card reloading.
| Command | Purpose |
|---|---|
Router#show diag
| Displays hardware information on line cards, including the history of line card reloads. |
This section provides the following configuration examples:
In the following example, single line card reloading is enabled for all lines cards in the Cisco 7500 series router:
Router(config)# service single-slot-reload-enable
In the following example, single line card reloading is disabled for all line cards in the Cisco 7500 series router:
Router(config)# no service single-slot-reload-enable
This section documents the new command that configures the Cisco 7500 Series Single Line Card Reload feature.
To enable single line card reloading for all line cards in the Cisco 7500 series router, use the service single-slot-reload-enable configuration command. To disable single line card reloading for the line cards in the Cisco 7500 series router, use the no form of this command.
service single-slot-reload-enable
Syntax Description
single-slot-reload-enable (Required) Specifies single line card reloading for all line cards in the router.
Defaults
Single line card reloading is disabled by default.
Command Modes
Global Configuration mode
Command History
12.0(13)S This command was introduced.
Release
Modification
Examples
In the following example, single line card reloading is enabled for all lines cards on the Cisco 7500 series router:
Router(config)# service single-slot-reload-enable
Related Commands
show running-config Displays configuration information. show diag Displays hardware information on line cards.
Command
Description
line card—Any I/O card that can be inserted in a modular chassis.
OIR—online insertion and removal. Feature that permits the addition, replacement, or removal of cards without interrupting the system power, entering console commands, or causing other software or interfaces to shut down. Sometimes called hot swapping or power-on servicing.
Posted: Thu Jun 7 18:36:12 PDT 2001
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