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When try to backup config from WLC, "config 802.11a 11nsupport a-mpdu tx priority" command is missing from backup-ed configuration. Due to that, a-mpdu will be enabled when WLC try to load this backup configuration.
a-mdpu is disabled by "config 802.11a 11nsupport a-mpdu tx priority all disable" command Then download configuration from WLC.
Re-configure CLI command after restore config.
Cisco Integration
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