Distributed Director Configuration Guide, Cisco IOS Release, 12.4T
DistributedDirector Cache Auto Refresh" in Distributed Director Configuration of 12.4 NM CG
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DistributedDirector Cache Auto Refresh

Table Of Contents

DistributedDirector Cache Auto Refresh

Feature Overview

Benefits

Related Technologies

Related Documents

Finding Feature Information

Supported Standards, MIBs, and RFCs

Prerequisites

Configuration Tasks

Enabling Cache Auto Refresh

Verifying the Cache Auto Refresh Feature

Configuration Examples

Enabling the Cache Auto Refresh Feature Example


DistributedDirector Cache Auto Refresh



Note Effective with Cisco IOS Release 12.4(24)T, this feature is not available in Cisco IOS software.


Feature History

Release
Modification

12.2(8)T

This feature was introduced.

12.4(24)T

This feature was removed.


This document describes the DistributedDirector Cache Auto Refresh feature in Cisco IOS Release 12.2(8)T. It includes the following sections:

Feature Overview

Finding Feature Information

Supported Standards, MIBs, and RFCs

Prerequisites

Configuration Tasks

Configuration Examples

Feature Overview

The DistributedDirector Cache Auto Refresh feature works in the background to continuously update all entries in the DistributedDirector cache. Once this background refresh feature is initiated, DistributedDirector periodically updates all expired cache entries. The DistributedDirector cache saves the latest answers to all past Domain Name System (DNS) queries received since cache auto refresh was initiated, and any repeat request is served directly from the cache when caching is enabled.

The new ip director cache refresh command enables the automatic background refresh feature for the DistributedDirector cache.

Benefits

Once the cache auto refresh feature is enabled, the cache will actively and continuously update every expired entry. This feature allows DistributedDirector to return answers to queries according to the latest and most accurate network information.

Related Technologies

DistributedDirector Configurable Cache

Related Documents

DistributedDirector Configurable Cache, Cisco IOS Release 12.2(8)T feature module

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Supported Standards, MIBs, and RFCs

Standards

No new standards are supported by this feature.

MIBs

No new MIBs are supported by this feature.

To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB website on Cisco.com at the following URL:

http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml

RFCs

No new RFCs are supported by this feature.

Prerequisites

The sorting cache must be enabled on DistributedDirector. To enable the sorting cache, use the ip director cache command.

Configuration Tasks

See the following section for configuration tasks for cache auto refresh. Each task in the list is identified as either required or optional.

Enabling Cache Auto Refresh (required)

Enabling Cache Auto Refresh

To enable cache auto refresh for DistributedDirector, use the ip director cache refresh command.

 
Command
Purpose

Step 1 

Router(config)# ip director cache

Enables the sorting cache on DistributedDirector.

Step 2 

Router(config)# ip director cache refresh

Enables the DistributedDirector Cache Auto Refresh feature.

To turn off cache auto refresh, use the no ip director cache refresh command.

 
Command
Purpose

Step 1 

Router(config)# no ip director cache refresh

Disables the DistributedDirector Cache Auto Refresh feature.


Verifying the Cache Auto Refresh Feature

To verify that the DistributedDirector Cache Auto Refresh feature is configured, enter the show running-config command.

Router(config)# ip director cache 

Router(config)# ip director cache refresh

Router# show running-config

ip host myhost 172.22.2.10 172.22.2.20 172.22.2.30 
.
.
.
ip director cache refresh

Configuration Examples

This section provides the following configuration example:

Enabling the Cache Auto Refresh Feature Example

Enabling the Cache Auto Refresh Feature Example

In the following example, the cache auto refresh background feature for DistributedDirector is enabled:

Router(config)# ip director cache 

Router(config)# ip director cache refresh

Router# show running-config

ip host myhost 172.22.2.10 172.22.2.20 172.22.2.30 
.
.
.
ip director cache refresh