System Management Configuration Guide, Cisco IOS XE Release 3SE (Cisco WLC 5700 Series)
Predownloading an Image to Access Points
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Predownloading an Image to Access Points

Predownloading an Image to Access Points

Finding Feature Information

Your software release may not support all of 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.

Predownloading an Image to an Access Point

To minimize network outages, you can now download an upgrade image to the access point from the controller without resetting the access point or losing network connectivity. Previously, you would download an upgrade image to the controller and reset it, which causes the access point to go into discovery mode. After the access point discovers the controller with the new image, the access point downloads the new image, resets, goes into discovery mode, and rejoins the controller.

You can now download the upgrade image to the controller and then download the image to the access point while the network is still up. When both devices are up, the access point discovers and rejoins the controller.

Restrictions for Predownloading an Image to an Access Point

The following are the restrictions for predownloading an image to an access point:

  • The maximum number of concurrent predownloads is limited to half the number of concurrent normal image downloads. This limitation allows new access points to join the controller during image downloading. If you reach the predownload limit, then the access points that cannot get an image sleep for a time between 180 to 600 seconds and then reattempt the predownload.
  • Access points with 16-MB total available memory may not have enough free memory to download an upgrade image and may automatically delete crash info files, radio files, and any backup images to free up space. However, this limitation does not affect the predownload process because the predownload image replaces any backup image on the access point.
  • All of the primary, secondary, and tertiary controllers should run the same images or the feature will not be effective.
  • At the time of reset, you must make sure that all of the access points have downloaded the image.
  • The access point can store only two software images.

Predownloading an Image to Access Points (CLI)

Before You Begin
There are some prerequisites that you must keep in mind while predownloading an image to an access point:
  • Predownloading can be done only when the controller is booted in the install mode.
  • You can copy the new image either from the TFTP server, flash image, or USB.
  • Before predownloading the new image, you must install the new software using the software install command and select no to the reload option.
SUMMARY STEPS

    1.    ap image predownload or ap ap-name predownload

    2.    show ap image

    3.    ap image swap

    4.    ap image reset

    5.    reload


DETAILED STEPS
     Command or ActionPurpose
    Step 1ap image predownload or ap ap-name predownload


    Example:
    Controller# ap image predownload
    Controller# ap ap1 predownload
    
     

    Downloads the new image to all access points or a specific access point connected to the controller.

     

    Step 2 show ap image


    Example:
    Controller# show ap image
     

    Verifies the access points predownload process.

     

    Step 3 ap image swap


    Example:
    Controller# ap image swap
     

    Specifies to swap the backup image to the primary image.

     

    Step 4 ap image reset


    Example:
    Controller# ap image reset
     

    Resets the access points.

     

    Step 5 reload


    Example:
    Controller# reload
     

    Resets the system.

     

    Monitoring Access Point Predownload Process

    This section describes the command for monitoring the access point predownload process.

    The following command can be used to monitor the access point predownload process.

    Table 1 Monitoring Access Point Predownload Process Commands

    Command

    Purpose

    show ap image

    Verifies the access points predownload process.

    Displaying Access Point Predownload Status

    While downloading the access point predownload image, you can simultaneously enter the show ap image command to verify the predownload progress on the access points:

    Controller# show ap image
    Total number of APs  : 1
    
    Number of APs 
           Initiated                  : 1
           Predownloading             : 1
           Completed predownloading   : 0
           Not Supported              : 0
           Failed to Predownload      : 0
    
    AP Name                           Primary Image   Backup Image    Predownload Status    Predownload Ver...  Next Retry Time    Retry Count 
    ------------------------------------------------------------------------------------------------------------------------------------------
    AP1                               10.0.1.66       10.0.1.66       Predownloading        10.0.1.67           NA                           0 
    
    
    
    Controller# show ap image
    
    Total number of APs  : 1
    
    Number of APs 
           Initiated                  : 1
           Predownloading             : 0
           Completed predownloading   : 1
           Not Supported              : 0
           Failed to Predownload      : 0
    
    AP Name                           Primary Image   Backup Image    Predownload Status    Predownload Ver...  Next Retry Time    Retry Count 
    ------------------------------------------------------------------------------------------------------------------------------------------
    AP1                               10.0.1.66       10.0.1.67       Complete              10.0.1.67           NA                           0 
    

    Examples: Access Point Predownload Process

    This example shows how to predownload an image to an access point AP1:
    Controller# ap image predownload
    Controller# show ap image
    Controller# ap image swap
    Controller# show ap image
    Controller# ap image reset
    Controller# reload
    
    

    Additional References for Predownloading an Image to an Access Point

    Related Documents

    Related Topic Document Title
    Lightweight access points configuration

    Lightweight Access Point commands

    Standards and RFCs

    Standard/RFC Title
    None

    MIBs

    MIB MIBs Link
    All supported MIBs for this release.

    To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

    http:/​/​www.cisco.com/​go/​mibs

    Technical Assistance

    Description Link

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    http:/​/​www.cisco.com/​support

    Feature History and Information For Performing Predownloading an Image to an Access Point

    Release Feature Information
    Cisco IOS XE 3.2SE This feature was introduced.