Table Of Contents
Release Notes for Cisco Aironet
1200 Series Access Points
August 20, 2002
These release notes describe features and caveats for Cisco Aironet 1200 Series Access Points running firmware version 11.50T. This release note also contains important information about the device.
Cisco Aironet Access Points are wireless LAN transceivers that can act as the connection point between wireless and wired networks or as the center point of a standalone wireless network. In large installations, the roaming functionality provided by multiple access points enables wireless users to move freely throughout the facility while maintaining uninterrupted access to the network.
Your 1200 series access point can contain two radios: a 2.4-GHz radio in an internal mini-PCI slot and a 5-GHz radio module in an external, modified cardbus slot. The access point supports one radio of each type, but it does not support two 2.4-GHz or two 5-GHz radios. You can configure the radios separately, using different settings on each radio.
The access point uses a browser-based management system, but you can also configure the access point using a terminal emulator, a Telnet session, or Simple Network Management Protocol (SNMP).
Firmware version 11.50T contains these new features:
•All the settings you need to configure an access point that contains both an internal 2.4-GHz radio and a 5-GHz radio module.
•The Optimize Ethernet for setting on the Ethernet Advanced page. This setting adjusts the Ethernet port for either performance (the default setting) or for statistics collection. The Optimize Ethernet for pull-down menu contains these options:
–Performance. When you select this option, the access point improves Ethernet performance by collecting only basic packet statistics such as source, destination, and length. The access point also ignores protocol filters for packets not forwarded to repeater access points or client devices.
–Statistics Collection. When you select this option, the access point collects complete packet statistics. For best performance, select Statistics Collection only when you use the access point as a network monitor or sniffer.
•The Rogue AP Alert Timeout setting on the Association Table Advanced page. This setting is reserved for future use. Currently, this feature is not supported and it has no effect on access point performance.
You can find the latest release of access point firmware at the following URL:
Installation in Environmental Air Space
Cisco Aironet 1200 Series Access Points are suitable for use in environmental air space in accordance with Section 300-22(c) of the National Electrical Code.
Note If you plan to mount the access point in an area subject to environmental air space with the intention of upgrading to a 5-GHz radio, Cisco recommends that you mount the access point horizontally so that its antennas point down. Doing so ensures that the access point complies with regulatory requirements for environmental air space after the 5-GHz radio is installed.
Caution The Cisco Aironet Power Injector has a smaller operating temperature range (32 to 104 oF; 0 to 40 oC) than the 1200 series access point. The power injector is not intended for use in extremely high or low temperatures or in environmental air spaces, such as above suspended ceilings.
For instructions on the proper installation and grounding of external antennas, refer to the National Fire Protection Association's NFPA 70, National Electrical Code, Article 810, and the Canadian Standards Association's Canadian Electrical Code, Section 54.
Warning Do not install the antenna near overhead power lines or other electric light or power circuits, or where it can come into contact with such circuits. When installing the antenna, take extreme care not to come into contact with such circuits, as they may cause serious injury or death.
This section describes issues you should consider before applying power to the access point.
Caution The nominal voltage for 1200 series access points is 48VDC, and the access point is operational up to 60VDC. Voltage higher than 60VDC can damage the equipment.
Caution Cisco Aironet Power Injectors are designed for use with 1200 series access points only. Do not use the power injector with any other Ethernet-ready device. Using the power injector with other Ethernet-ready devices can damage the equipment.
Use Only One Power Option
You cannot provide redundant power to the access point with both DC power to its power port and inline power from a patch panel or powered switch to the access point's Ethernet port. If you apply power to the access point from both sources, the switch or power patch panel might shut down the port to which the access point is connected. Figure 1 shows the power configuration that can shut down the port on the patch panel or powered switch.
Figure 1 Improper Power Configuration Using Two Power Sources
Operating 5-GHz Radio Requires Power Injector or Power Module
Only the 1200 series power injector and the 1200 series power module can support operation of the 5-GHz radio in the access point. Currently, switches with inline power and power patch panels do not provide enough power for operation of the 5-GHz radio.
Access Point Requires 1200 Series Universal Power Supply and Power Injector
You must use a 1200 series universal power supply to power the access point. If you need to use a power injector to inject power into the access point's Ethernet port, you must use a 1200 series power injector. The 350 series universal power supply and power injector are not compatible with the 1200 series access point.
You must have a 1200 series access point to install firmware version 11.50T.
Your access point must be running firmware version 11.40T or later to install firmware version 11.50T.
Upgrading to a New Firmware Release
Determining the Firmware Version
The firmware version number is in the upper-left corner of most management screens in the web-browser interface and at the top of the home (Summary Status) page in the command-line interface.
For instructions on installing access point firmware:
1. Follow this link to the Cisco Aironet documentation home page:
2. Follow this path to the product, document, and chapter:
Aironet 1200 Series Wireless LAN Products > Cisco Aironet 1200 Series Access Points >
Cisco Aironet 1200 Series Access Point Software Configuration Guide > Managing Firmware and Configurations > Updating Firmware
3. Follow this link to the Software Center on Cisco.com and download firmware version 11.50T:
Note To upgrade firmware from a file server, you must enter settings on the access point's FTP Server Setup page. Refer to the "Updating from a File Server" section on page 6-5 in the Cisco Aironet 1200 Series Access Point Software Configuration Guide for more information.
Limitations and Restrictions
This section describes limitations and restrictions for 1200 series access points.
Removing Power During Firmware Update Can Corrupt Radio Firmware
When you update the firmware on an access point, allow the unit to finish its start-up sequence before removing power. If you update the firmware and remove power before the unit finishes the start-up sequence, the radio firmware might be corrupted, making the unit inoperable. If the radio firmware is corrupted, the radio indicator (the bottom of the three indicators on top of the access point) is red continuously, and the following error message appears when the access point starts up:
The access point should recover from this error automatically.
You can safely remove power after a firmware update when the configuration management pages reappear in the command-line or web-browser interfaces, or when the three status indicators on top of the unit complete the following pattern:
1. All three indicators are continuously green, meaning that the access point is beginning to update the firmware.
2. The middle indicator is continuously green and the top and bottom indicators are off, indicating that the access point is updating the radio firmware.
When the middle indicator blinks or the top and bottom indicators blink, you can remove power.
EAP Authentication Requires Matching 802.1x Protocol Drafts
Note This section applies to wireless networks set up to use LEAP. If you do not use LEAP on your wireless network, you can skip this section.
Wireless client devices use Extensible Authentication Protocol (EAP) to log onto a network and generate a dynamic, client-specific WEP key for the current logon session. If your wireless network uses WEP without EAP, client devices use the static WEP keys entered in the Aironet Client Utilities.
If you use Network-EAP authentication on your wireless network, your client devices and access points must use the same 802.1x protocol draft. For example, if the radio firmware on the client devices that will associate with an access point is 4.16, the access point should be configured to use Draft 8 of the 802.1x protocol. Table 1 lists firmware versions for Cisco Aironet products and the draft with which they comply.
Table 1 802.1x Protocol Drafts and Compliant Client Firmware
Firmware Version Draft 7 Draft 8 Draft 10 1
PC/PCI cards 4.13
PC/PCI cards 4.16
PC/PCI cards 4.23
PC/PCI cards 4.25 and later
WGB34x/352 8.61 and later
AP34x/35x 11.05 and earlier
AP34x/35x 11.06 and later2
AP34x/35x 11.07 and later
AP12xx 11.40T and later
1 The functionality in Draft 10 is equivalent to the functionality in Draft 11, the ratified draft of the 802.1x standard.
2 The default draft setting in access point firmware version 11.06 and later is Draft 10.
Use the Authenticator Configuration page to select the draft of the 802.1x protocol the access point should use. Follow these steps to set the draft for your access point:
Step 1 Browse to the Authenticator Configuration page in the access point management system:
a. On the Summary Status page, click Setup.
b. On the Setup page, click Security.
c. On the Security Setup page, click Authentication Server.
Step 2 Use the 802.1x Protocol Version (for EAP authentication) pull-down menu to select the draft of the 802.1x protocol the access point radio should use. Menu options include:
•Draft 7—No radio firmware versions compliant with Draft 7 have LEAP capability, so you should not need to select this setting.
•Draft 8—Select this option if LEAP-enabled client devices that associate with this access point use radio firmware versions 4.13, 4.16, or 4.23.
•Draft 10—This is the default setting. Select this option if client devices that associate with this access point use Microsoft Windows XP EAP authentication or if LEAP-enabled client devices that associate with this access point use radio firmware version 4.25 or later. The functionality in Draft 10 is equivalent to the functionality in Draft 11, the ratified draft of the 802.1x standard.
Step 3 Click Apply or OK to apply the setting. The access point reboots.
Select WEP Key 1 as Transmit Key for EAP Authentication
If you use Network-EAP as the authentication type on your wireless network, you must select key 1 as the transmit key on the access point AP Radio Data Encryption page. The access point uses the WEP key you enter in key slot 1 to encrypt multicast and broadcast data signals that it sends to EAP-enabled client devices. Because the access point transmits the WEP key used for multicast messages to the EAP-enabled client device during the EAP authentication process, that key does not have to appear in the EAP-enabled device's WEP key list. The access point uses a dynamic WEP key to encrypt unicast messages to EAP-enabled clients. When you set up a repeater access point to authenticate as a LEAP client, the repeater derives a dynamic WEP key and uses it to communicate with the root access point. Repeaters not set up for LEAP authentication use static WEP keys when communicating with other access points.
Note If you do not use EAP authentication on your wireless network, you can select any WEP key as the transmit key. If you use EAP authentication and you enable broadcast key rotation, you can enable WEP without entering WEP keys.
MIB File Compatible with Firmware Version 11.00 and Later
The access point MIB file (AWCVX-MIB) is supported only by access point firmware version 11.00 and later. Earlier versions of firmware do not support this MIB. You can download the access point MIB at http://www.cisco.com/public/sw-center/sw-wireless.shtml.
Hot Standby Mode and Radio Diagnostics Available for 2.4-GHz Radio Only
Hot Standby mode is available only for the 2.4-GHz radio in access points that contain two radios. Hot Standby mode is not available for 5-GHz radios. Also, the Carrier Test and Antenna Alignment radio diagnostics tool are available only for the access point's 2.4-GHz radio.
This section lists important information about access points running firmware version 11.50T.
Error Message Appears for Access Points with One Radio
When you install firmware version 11.50T in an access point with one radio, an error message appears. If your access point contains only the internal 2.4-GHz radio, this error message appears:** Failed to Load Driver for device entry #3.
If your access point contains only the external 5-GHz radio, this error message appears:** Failed to Load Driver for device entry #2.
You can ignore these messages. The errors do not appear if your access point contains two radios.
Enabling Broadcast Key Rotation on One Radio Enables It on Both Radios
If you enable Broadcast Key Rotation on one of the radios in a dual-radio access point, Broadcast Key Rotation is automatically enabled on the other radio.
Set Flow Control to None or Xon/Xoff When Using Terminal Emulator
The terminal emulator flow control setting for 1200 series access points (none or Xon/Xoff) differs from the flow control setting for 340 and 350 series access points (none, Xon/Xoff, or Hardware).
To use a terminal emulator to open the 1200 series access point's command-line interface (CLI), use these settings for the terminal emulator connection:
•8 data bits
•1 stop bit
•No flow control or Xon/Xoff
Reboot of Workgroup Bridges Required When Allowing More Than 20
With firmware version 11.50T, you can select no for the Classify Workgroup Bridges as Network Infrastructure setting on the AP/Root Radio Advanced page to allow up to 50 workgroup bridges to associate to the access point. When you select no for this setting, you must reboot workgroup bridges associated to the access point.
Cisco Discovery Protocol Re-Enabled for Individual Interfaces on Reboot
The Cisco Discovery Protocol (CDP) feature is enabled by default, and CDP is enabled for each of the access point's CDP-relevant interfaces by default. However, if you disable CDP for one of the individual interfaces, the access point re-enables CDP for that interface when it reboots. If you disable CDP completely, the access point does not re-enable CDP on reboot.
This section lists resolved and open software issues in firmware version 11.50T.
Getting Bug Information on Cisco.com
If you are a registered Cisco user, you can use the Cisco TAC Software Bug Toolkit, which consists of three tools (Bug Navigator, Bug Watcher, and Search by Bug ID Number) that help you identify existing bugs (or caveats) in Cisco software products.
The following caveats have not been resolved for firmware version 11.50T:
•CSCdy03375—The Carrier Test and Antenna Alignment radio diagnostic tools are available only for the access point's 2.4-GHz radio.
•CSCdy03381—One access point radio sometimes fails to restart after a warm reset. Workaround: Perform a cold reboot of the access point if one of the radios does not restart.
•CSCdx07970—Cannot restore defaults on the CLI's Ethernet Protocol Filters and Root Radio Protocol Filters pages. The Restore Defaults feature does not work on the CLI's Ethernet Protocol Filters and Root Radio Protocol Filters. Workaround: Use the web-browser interface to restore defaults on the Ethernet Protocol Filters and Root Radio Protocol Filters pages.
•CSCdy10787—The access point aborts any configuration containing an unknown MIB variable. When an access point receives a configuration from another access point that is running a newer firmware version than the receiving access point, the receiving access point aborts the configuration if it encounters a MIB variable that it does not recognize. Workaround: Upgrade access points to the same firmware version before distributing configurations.
•CSCdx11703—Hot standby packets can flood the network. Each time a standby access point checks the status of the access point it is monitoring, it sends 11 probe packets. If you have several access points on your network set up for hot standby, the probe packets can overload your network. Workaround: Enter a higher value for the Polling Frequency setting on the Hot Standby page. For example, instead of polling the monitored access point every few seconds, enter 600 in the Polling Frequency entry field to poll the monitored access point every ten minutes.
•CSCdy11906—When WEP is enabled and you set all WEP keys to not set, WEP is still enabled but the web-browser page indicates that WEP is disabled. Workaround: To disable WEP, select no encryption from the Use of Data Encryption by Stations is pull-down menu on the Radio Data Encryption page.
•CSCdy12876—1200 series access points sometimes lock up under extremely large bursts of Ethernet traffic. Reboot the access point if it locks up.
•CSCdy13227—Repeater statistics page is invalid. When you associate a repeater access point to a root access point, a link to the repeater appears on the root access point's Summary Status screen. However, when you click the link the page does not appear.
•CSCdx19068—Unlimited LEAP logins configuration on ACS server can lock out roamed clients. When the ACS server's session policy is configured for other than unlimited simultaneous LEAP logins and a LEAP-enabled client device roams away from the access point long enough for a STOP record to appear in the Radius Accounting log, the client cannot reauthenticate until it is purged from the list of logged-in users on the ACS server. Workaround: Set the server's IETF (028) idle timeout attribute to a low value so the server ends the roamed client's session and the client can start a new session when it returns.
•CSCdx19118—The access point reboots when more than 23 workgroup bridges are associated to it and you change one of these settings:
–SSID on the Express Setup or AP/Root Radio Hardware pages
–Classify Workgroup Bridges as Network Infrastructure on the AP/Root Radio Advanced page
–Requested Status on the AP/Root Radio Advanced page from Up to Down and back to Up
•CSCdy20169—When a 1200 series access point boots, it sometimes displays this warning:(Warning) Routine "pktRouterRcvRtn" is unable to Take the forwardTbl Guard semaphore
You can ignore this message.
•CSCdy23465—Access points sometimes fail to connect to the DNS server and report this error:Repeatedly failed to connect to DNS Server. Temporarily DISABLING DNS lookups. To re-enable, explicitly Disable then re-Enable DNS on the Name Server Setup page.
To re-enable DNS lookups, select Disabled for the Domain Name System setting on the Name Server Setup page and click Apply. Then select Enabled and click Apply.
•CSCdy24215—When the Cisco Catalyst 4000 Series Switch provides inline power to a 1200 series access point, the power at startup is sometimes higher than the access point's steady state level, causing the access point to reboot. Workaround: Use a power source other than the Cisco Catalyst 4000 Series switch to power the access point.
•CSCdy25035—You must reboot the access point when you enable or change accounting parameters before the new settings take effect.
•CSCdy27377—The Search for Least Congested Channel feature does not work for the 5-GHz radio.
•CSCdy27831—When you set the default Unicast Address Filter to disallowed, you must reboot the access point before the setting takes effect.
•CSCdx32469—When you set up a standby access point with Open authentication with Require EAP enabled and with LEAP enabled, the radio on the monitored access point shuts down approximately one minute after you enable hot standby. When the radio on the monitored access point shuts down, the standby access point takes over as the primary access point. Workaround: Enable static WEP or no WEP on the standby access point.
•CSCdx41471—Enabling MIC on 1200 series access points can decrease throughput by up to 30% for the access point's highest data rates.
•CSCdw53237—When you change the access point's role in radio network from repeater to root, the link from the access point to the previous root device remains active. Workaround: Reboot the access point after changing its role from repeater to root.
•CSCdw83703—The access point sometimes reports this error when LEAP-enabled workgroup bridges are associated:Could not allocate mBlk from netPool 0x00d0a5a8!
You can ignore this message.
•CSCdx92461—Hot Standby mode is available only for the 2.4-GHz radio in access points that contain two radios. Hot Standby mode is not available for 5-GHz radios.
•CSCdx93214—Broadcast key rotation does not work on second-level repeater acess points. For example, in a repeater chain consisting of a root access point, a repeater access point associated to the root, and a second repeater associated to the first repeater, the second repeater cannot pass data when brodacast key rotation is enabled. If additional repeater access points are added to the chain, they also cannot pass data when broadcast key rotation is enabled.
The following caveat has been resolved in firmware version 11.50T:
•CSCdy18881—Access points no longer revert to the North American country code when reset to factory defaults.
•CSCdw36550 and CSCdx13824—With all data rates enabled, the access point's Linktest feature no longer sends all test packets at the highest available data rate. As attenuation increases (signal strength decreases), the access point now sends test packets at lower data rates as it should.
•CSCdw42125—The access point no longer attempts to send MAC authentication requests to the server before the network is ready.
•CSCdw64319—When you enter the SNMP command sysObjectID, the access point is now properly identified as ciscoAIRAP1200.
•CSCdx87342—IP phones set to Max PSP now respond to signals from a 1200 series access point.
•CSCdx89832—When you access the management system on a 1200 series access point through the console port, the access point now always displays both the prompt for a username and a password when User Manager is enabled.
For the most up-to-date, detailed troubleshooting information, refer to the Cisco TAC website at http://www.cisco.com/tac. Select Wireless Technologies under Top Issues.
This section describes errors, changes, and omissions for the access point user documentation.
The screen shot on page 18 in the Quick Start Guide: Cisco Aironet 1200 Series Access Points mistakenly shows that the Ensure Compatibility With 2Mb/sec Clients or non-Aironet 802.11 setting is available for the 5-GHz radio module on the Express Setup page. However, this setting is available only for the 2.4-GHz internal radio and is not available for the 5-GHz radio module. Figure 2 shows a corrected screen shot of the Express Setup page.
Figure 2 Corrected Screen Shot of the Express Setup Page
The Rogue AP Alert Timeout setting on the Association Table Advanced page is reserved for future use. Currently, this feature is not supported, and it has no effect on access point performance.
Use the following documents with this document:
•Quick Start Guide: Cisco Aironet 1200 Series Access Points
•Quick Start Guide: Cisco Aironet 1200 Series Access Point Radio Upgrade Instructions
•Cisco Aironet 1200 Series Access Point Hardware Installation Guide
•Cisco Aironet 1200 Series Access Point Software Configuration Guide
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Copyright © 2002, Cisco Systems, Inc.
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