Pre-authentication is a feature that allows a mobile device to authenticate with other Cisco Access Points (APs) that it may roam to in the future. To achieve this, the mobile station authentication frames are forwarded by the AP to the target AP, over the wired network. The first time a client associates to the network, the client must complete a full authentication. However, if the client knows where it will roam, the client can pre-authenticate to a new AP.
Pre-authentication is similar to IEEE 802.1X. The client performs an authentication through the new AP, which acts as the authenticator. The pre-authentication packets traverse through the existing AP to the new AP. Once the authentication is successful, the pre-authentication completes with a PMK security association established between the client and the new AP.
The fact that mobile stations can authenticate with several APs at any given time creates a considerable load on the authentication server. Also, pre-authentication is performed at the IEEE 802 layer; it does not work across IP subnets. For these reasons, the Cisco Aironet products and Airespace WLAN systems do not support pre-authentication.
Technical product specification / features
WLAN adapters (wireless card) / ACU (Aironet Client Utility)
From what I read, the maximum allowed clients under this configuration is 200, yet the 5508 controller supports up to 7000 clients? How is that possible with just 2 bands, 2.4 and 5 GHz, each only supporting maximum 200 for each band? Am I missi...
Hello Everyone,I’m working on the WLAN environment based on AIR-AP3802I-E-K9 with WLC 5529 184.108.40.206. For unknown reason some wireless clients (connected based 2,4GHz – 802.11g) just disappear from the network.Based on my observation, at least part of dis...
Anybody here to happen to have a fairly fresh Prime 3.9 installation (without a recovered application backup)?
I'm wondering something about the "Assurance And Health Summary" Job Dashboard.
Which jobs do you have there for a fairly fresh installat...
Hi i have a some AP1562I that are running Mobility express 220.127.116.11 one as a WLC and others as AP, but looking to upgrade it to the latest version but couldn't find out if i could upgrade straight to 18.104.22.168, or if not which versions I would...
Hello, I have a network with 350 Cisco 1810W access points that are connected to Cisco 3650 PoE switches. I have noticed that the APs are drawing almost the full 30W per port. I believe these APs should only be drawing 8 to ...