How many AP upgrade modes are available? How do I set the AP upgrade mode

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Currently, three AP upgrade modes are available: AC loading, FTP loading and SFTP loading.
1. AC loading: The target version file of the AP is saved on the AC. During loading, the AC sends the target version file to the AP using CAPWAP.
2. FTP loading: The target version file of the AP is saved on the FTP server. During loading, the AP logs in to the FTP server and obtains the target version file.
3. SFTP loading: The target version file of the AP is saved on the SFTP server. During loading, the AP logs in to the SFTP server and obtains the target version file.

Run the ap-update mode { ftp-mode | ac-mode | sftp-mode } command in WLAN mode to set the AP upgrade mode. There are three upgrade modes that care AC, FTP and SFTP.

Other related questions:
Which upgrade modes does an AP support
Currently, an AP can be upgraded using the AC, FTP, or SFTP. - AC loading: The target version file of the AP is saved on the AC. During loading, the AC sends the target version file to the AP using CAPWAP. - FTP loading: The target version file of the AP is saved on the FTP server. During loading, the AP logs in to the FTP server and obtains the target version file. - SFTP loading: The target version file of the AP is saved on the SFTP server. During loading, the AP logs in to the SFTP server and obtains the target version file. For information about how to configure AP upgrade modes, see "How do I configure an AP's upgrade mode."

Online upgrade mode of the AP supported by the AC
FTP online upgrade mode is supported.

Why do many APs report failures when they are upgraded in batches in FTP mode
The FTP server limits the number of connected users. When the number of users exceeds the threshold, new link requests are denied or APs fail to log in to the FTP server, which leads to an upgrade failure.

How do I batch upgrade APs of a specified type? Can I upgrade a specified AP
Perform the following operations to batch upgrade APs of the specified type: - V200R005 and earlier versions: 1. Run the ap-update mode { ftp-mode | ac-mode | sftp-mode } command in WLAN mode to set the AP upgrade mode. 2. Save the AP version file to the AC, FTP server or SFTP server. 3. Run the ap-update update-filename filename ap-type type-id [ region region-id ] command in WLAN mode to specify the AP upgrade file. You do not need to add flash:/ to the file name. 4. Run the ap-update multi-load type-id [ region region-id ] ommand in WLAN mode to batch upgrade APs of the specified type. You can only batch upgrade APs of a specified type or APs of a specified type in the same AP region. During AP login, if the software versions on the AP and AC are different, the AP is upgraded automatically. - V200R006 and later versions: 1. Run the ap update mode { ftp-mode | ac-mode | sftp-mode } command in WLAN mode to set the AP upgrade mode. 2. Save the AP version file to the AC, FTP server or SFTP server. 3. Run the ap update update-filename filename ap-type type-id [ ap-group ap-group-name ] command in WLAN mode to specify the AP upgrade file. You do not need to add flash:/ to the file name. 4. Run the ap update multi-load ap-type type-id [ ap-group ap-group-name | { ap-name ap-name | ap-id ap-id } &<1�?0> ] command in WLAN mode to batch upgrade APs of the specified type. During AP login, if the software versions on the AP and AC are different, the AP is upgraded automatically.

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