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Cisco Systems CB21AG and PI21AG manual Resolved Caveats

Models: CB21AG and PI21AG

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Caveats

•CSCse44432—PI21AG card in HP DC5100 might result in NMI parity error

With a PI21AG card, long software installations over the network might fail. If error reporting is enabled in the BIOS, this failure might appear as a BIOS-level blue screen error. If error reporting is not enabled, this failure appears as a loss of network connectivity even though the card appears to be associated.

This condition occurs when the PI21AG card is used in a HP DC5100 and is associtated to an AP1200 with an 802.11b radio. This condition does not occur with an AP with an 802.11g radio.

•CSCse49324—CB21AG retransmission mechanism has problems with RRM in LWAPP network

A CB21AG client that is operating in an LWAPP infrastructure loses connection for small periods of time. When the AP is performing radio resource management (RRM), the AP goes off channel. During these periods, the AP cannot hear and answer ACK and RTS frames from the client. The client card initiates a scan for another AP, and network traffic for the client is affected.

Workaround: Increase the HwTxRetries value from 4 to 14 (registry entry) so that the client card continues to retry for the 20 to 30 milliseconds that the AP is off channel.

Resolved Caveats

The following caveat has been resolved in release 3.0:

•CSCeh59294—Failure to find domain controller during LEAP authentication

The client adapter may be unable to find a domain controller when attempting to LEAP authenticate. This state can be a normal condition due to network unavailability.

•CSCeh59374—Switching between profiles is slow

The client adapter may take up to 40 seconds to switch from one profile to another.

•CSCei30892—Multi-byte username cannot pass EAP-FAST authentication

The CB21AG and PI21AG client adapters are unable to successfully EAP-FAST authenticate with an ACS server when the username contains multi-byte characters.

•CSCei40773—Incorrect messages on LEAP and EAP-FAST Authentication Status windows

The LEAP and EAP-FAST Authentication Status windows show a successful status even if an IPX frame type is not detected or a domain controller is not found on the network.

•CSCsb46833—IOS access point with EAP-secured SSID toggles between "Open" and "Secure"

When an IOS access point is configured with an SSID mapped to a VLAN and the SSID is secured with EAP and WPA-TKIP, then in the site survey utility's AP scan list, the access point may toggle between "Open" and "Secure." In this mode, the access point sends out the network configuration information in the beacon and probe responses. Certain fields may differ between beacons and probe responses when VLANs are enabled. The client adapter driver may report the fields from the beacon frame or probe response frame, whichever is received last.

•CSCsb53874—Timing error prevents MAC address authentication

When using MAC address authentication, the client adapter fails to authenticate due to a timing error. To work around this problem, do not use MAC address authentication.

•CSCsb80735—LEAP-authenticated CB21AG loses connectivity

A LEAP-authenticated CB21AG using WEP mandatory encryption might lose connectivity after some time and be unable to find an AP. This condition has been observed for an IBM T42 laptop running Windows XP, service pack 1 or 2.

Release Notes for Cisco Aironet 802.11a/b/g Client Adapters (CB21AG and PI21AG) Install Wizard 3.0

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OL-8338-01

 

 

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Cisco Systems CB21AG and PI21AG manual Resolved Caveats
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CB21AG and PI21AG specifications

Cisco Systems is renowned for its innovative networking solutions, and the CB21AG and PI21AG are significant additions to its portfolio, designed to enhance connectivity in diverse environments.

The Cisco CB21AG is a compact and versatile 802.11a/b/g/n wireless access point tailored for mission-critical applications. One of its standout features is its dual-band capability, operating simultaneously on both the 2.4 GHz and 5 GHz bands. This flexibility facilitates enhanced performance, allowing users to optimize their wireless networks to better meet the specific demands of various devices.

Incorporating advanced technologies such as Cisco CleanAir, the CB21AG intelligently identifies and mitigates sources of interference, ensuring a more reliable wireless experience. This feature not only enhances the quality of area coverage but also provides better performance metrics for users. Furthermore, the CB21AG supports Power over Ethernet (PoE), allowing easier installation and placement by eliminating the need for additional power sources.

On the other hand, the Cisco PI21AG is an equally robust offering, designed for wireless deployments in diverse industries, including retail, healthcare, and education. The PI21AG extends the benefits of dual-band connectivity to provide seamless roaming capabilities, crucial for environments where users frequently move between access points.

The PI21AG is equipped with advanced security features that safeguard the network against unauthorized access and breaches. This includes WPA3 security protocols, which enhance encryption and improve overall security. Additionally, it supports advanced network management capabilities, enabling IT departments to monitor performance metrics and make real-time adjustments to optimize user experience.

Both the CB21AG and PI21AG are designed with scalability in mind, ensuring they can grow with an organization’s needs. Their lightweight designs facilitate easy mounting in various locations, ensuring that users can obtain the best possible connectivity regardless of their environment.

In conclusion, the Cisco CB21AG and PI21AG represent state-of-the-art wireless access solutions, with key features that address the needs of modern networking demands. Their robust design, advanced technologies, and strong security measures make them excellent choices for organizations looking to enhance their wireless capabilities, ensuring reliable and efficient connectivity.