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The Configuration Generation Performance Enhancement feature assists configuration management by enabling faster collection of running configuration file information. This feature is especially useful in managing large networks with numerous interfaces configured.
The device on which the Configuration Generation Performance Enhancement feature is used must have enough memory available to store (cache) a large interface configuration file. For example, if the interface configurations take up 15 KB of memory, using this feature would require having an additional 15 KB of memory space available.
In the Cisco IOS XE software configuration model, the configuration state is maintained in a distributed manner, with each component storing its own configuration state. To retrieve configuration information, the software must poll every component to collect the distributed information. This configuration state retrieval operation is performed by a process known as nonvolatile generation (NVGEN), and it is used by command-line interface (CLI) commands such as show running-configuration , write memory , and copy system:running-configuration to display or copy the running system configuration. When invoked, NVGEN queries each system component and each instance of interface or other configuration objects. A running configuration file is constructed as NVGEN traverses the system performing these queries.
Before the Configuration Generation Performance Enhancement feature was introduced, NVGEN always had to query the entire system and could generate only a total configuration. The time required to process the running configuration creates performance problems for configuration management, because completion of the NVGEN operation can take many minutes.
The Configuration Generation Performance Enhancement feature reduces the execution time for NVGEN processes and is especially useful for managing large configuration files that contain numerous interface configurations. This feature provides faster execution of commands that process the running system configuration by caching interface configuration information in system memory, and by retrieving only configuration information that has changed.
Perform this task to enable the Configuration Generation Performance Enhancement.
| Command or Action | Purpose | |
|---|---|---|
|
Step 1 |
enable Example: |
Enables privileged EXEC mode.
|
|
Step 2 |
configure terminal Example: |
Enters global configuration mode. |
|
Step 3 |
parser config cache interface Example: |
Reduces the time required for the CLI to execute commands that manage the running system configuration, especially for large configuration files. |
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Step 4 |
end Example: |
Exits global configuration mode and returns to privileged EXEC mode. |
The following example shows how to enable the Configuration Generation Performance Enhancement feature:
Device(config)# parser config cache interface
You can verify that the parserconfigcacheinterface command has been enabled by checking for the command in the system configuration file displayed when you enter the showrunning-configuration EXEC command.
 Note |
The first time you display the configuration file, you will not see much evidence of improvement in performance because the interface cache will be filled up. However, you will notice performance improvements when you enter subsequent NVGEN-type commands such as the showrunning-config EXEC command. Each time the interface configuration changes, the cache of the specified interface is flushed. The other interface data remains cached as before. Entering an NVGEN-type command after modifying the interface configuration will once again not show much evidence of improvement until the next NVGEN-type command is entered. |
Device# show running-config
!
!
parser config cache interface
!
!The following sections provide references related to the Configuration Partitioning feature.
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Related Topic |
Document Title |
|---|---|
|
Running configuration performance enhancement--parserconfigcache for interfaces. |
Configuration Generation Performance Enhancement |
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Provisioning of customer services, Config Rollback, Config Locking, and configuration access control |
Contextual Configuration Diff Utility |
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Configuration management--Config change logging. |
Configuration Change Notification and Logging |
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Configuration management --Quick-save for config change logging1. |
Configuration Logger Persistency |
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Cisco IOS software configuration access control and config session locking (“Config Lock”). |
Exclusive Configuration Change Access and Access Session Locking |
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Standard |
Title |
|---|---|
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No standards are associated with this feature. |
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MIB |
MIBs Link |
|---|---|
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No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature. |
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RFC |
Title |
|---|---|
|
No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature. |
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Description |
Link |
|---|---|
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The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.|
Feature Name |
Releases |
Feature Information |
|---|---|---|
|
Configuration Generation Performance Enhancement |
The Configuration Generation Performance Enhancement feature assists configuration management by enabling faster collection of running configuration file information. This feature is especially useful in managing large networks with numerous interfaces configured. Commands associated with this feature:
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