Cisco Wireless LAN Controller Configuration Guide, Release 7.4
Configuring FlexConnect AP Upgrades for FlexConnect APs
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Configuring FlexConnect AP Upgrades for FlexConnect APs

Configuring FlexConnect AP Upgrades for FlexConnect APs

Information About FlexConnect AP Upgrades

Normally, when upgrading the image of an AP, you can use the pre-image download feature to reduce the amount of time the AP is unavailable to serve clients. However, it also increases the downtime because the access point cannot serve clients during an upgrade. The Pre-image download feature can be used to reduce this downtime. However, in the case of a branch office set up, the upgrade images are still downloaded to each access point over the WAN link, which has a higher latency.

A more efficient way is to use the FlexConnect AP Upgrade feature. When this feature is enabled, one access point of each model in the local network first downloads the upgrade image over the WAN link. It works similarly to the master-slave or client-server model. This access point then becomes the master for the remaining access point of the similar model. The remaining access points then download the upgrade image from the master access point using the pre-image download feature over the local network, which reduces the WAN latency.

Restrictions for FlexConnect AP Upgrades for FlexConnect Access Points

  • The primary and secondary controllers in the network must have the same set of primary and backup images.

  • If you configured a FlexConnect group, all access points in that group must be within the same subnet or must be accessible through NAT.

  • If you upgrade from a release that is prior to Release 7.5 directly to Release 7.6.X or a later release, the predownload process on Cisco AP2600 and AP3600 fails. After the Cisco WLC is upgraded to Release 7.6.X or a later release, the new image is loaded on Cisco AP2600 and AP3600. After the upgrade to a Release 7.6.X image, the predownload functionality works as expected. The predownload failure is only a one-time failure.

Configuring FlexConnect AP Upgrades (GUI)

    Step 1   Choose Wireless > FlexConnect Groups.

    The FlexConnect Groups page appears. This page lists the FlexConnect Groups configured on the controller.

    Step 2   Click the Group Name link on which you want to configure the image upgrade.
    Step 3   Click the Image Upgrade tab.
    Step 4   Select the FlexConnect AP Upgrade check box to enable a FlexConnect AP Upgrade.
    Step 5   If you enabled the FlexConnect AP upgrade in the previous step, you must enable the following parameters:
    • Slave Maximum Retry Count—The number of attempts the slave access point must try to connect to the master access point for downloading the upgrade image. If the image download does not occur for the configured retry attempts, the image is upgraded over the WAN.
    • Upgrade Image—Select the upgrade image. The options are Primary, Backup, and Abort.
    • Click FlexConnect Upgrade to upgrade.
    Step 6   From the AP Name drop-down list, click Add Master to add the master access point.

    You can manually assign master access points in the FlexConnect group by selecting the access points.

    Step 7   Click Apply.

    Configuring FlexConnect AP Upgrades (CLI)

    • config flexconnect group group-name predownload {enable | disable}—Enables or disables the FlexConnect AP upgrade.

    • config flexconnect group group-name predownload master ap-name—Manually assigns an access point as the master access point.

    • config flexconnect group group-name predownload slave retry-count ap-name—Sets the access point as a slave access point with a retry count.

    • config flexconnect group group-name predownload start—Initiates the image download on the access points in the FlexConnect group.

    • config ap image predownload {abort | primary | backup}—Assigns the image type that must be downloaded for the preimage upgrade.

    • show flexconnect group group-name—Displays the summary of the FlexConnect group configuration.

    • show ap image all—Displays the details of the images on the access point.