Cisco Cisco Aironet 1200 Access Point Notas de publicación
12
Release Notes for Cisco Aironet Access Points and Bridges for Cisco IOS Release 12.4(10b)JA4
OL-17693-01
Important Notes
Important Notes
This section describes important information about access points and bridges.
CCKM and Fast Roaming on Cisco 7921/7925 IP Phones
When a 7921 or 7925 wireless associates to an access point in a WDS with CCKM, it cannot fast roam
because call admission control is not enabled. To work around this issue you must enable admission
control by issuing the admit-traffic command in the access point SSID configuration as shown in the
following example:
because call admission control is not enabled. To work around this issue you must enable admission
control by issuing the admit-traffic command in the access point SSID configuration as shown in the
following example:
dot11 ssid voice
vlan 21
authentication open eap eap_methods
authentication network-eap eap_methods
authentication key-managemenet wpa cckm
admit-traffic
Access Point Creates File When Radar is Detected on a DFS Channel
When an access point detects a radar on a DFS channel, the access point creates a file in its flash memory.
The file is based on the 802.11a radio serial number and contains the channel numbers on which the the
radar is detected. This is an exepected behavior and you should not remove this file. See the caveat
CSCsv36602 in the
The file is based on the 802.11a radio serial number and contains the channel numbers on which the the
radar is detected. This is an exepected behavior and you should not remove this file. See the caveat
CSCsv36602 in the
Access Points Send Multicast and Management Frames at Highest Basic Rate
Access points running recent Cisco IOS versions are transmitting multicast and management frames at
the highest configured basic rate, and is a situation that could causes reliability problems.
the highest configured basic rate, and is a situation that could causes reliability problems.
Access points running LWAPP or autonomous IOS should transmit multicast and management frames at
the lowest configured basic rate. This is necessary in order to provide for good coverage at the cell's
edge, especially for unacknowledged multicast transmissions where multicast wireless transmissions
may fail to be received.
the lowest configured basic rate. This is necessary in order to provide for good coverage at the cell's
edge, especially for unacknowledged multicast transmissions where multicast wireless transmissions
may fail to be received.
Since multicast frames are not retransmitted at the MAC layer, stations at the edge of the cell may fail
to receive them successfully. If reliable reception is a goal, then multicasts should be transmitted at a
low data rate. If support for high data rate multicasts is required, then it may be useful to shrink the cell
size and to disable all lower data rates.
to receive them successfully. If reliable reception is a goal, then multicasts should be transmitted at a
low data rate. If support for high data rate multicasts is required, then it may be useful to shrink the cell
size and to disable all lower data rates.
Depending on your specific requirements, you can take the following action:
•
If you need to transmit the multicast data with the greatest reliability and if there is no need for great
multicast bandwidth, then configure a single basic rate, one that is low enough to reach the edges of
the wireless cells.
multicast bandwidth, then configure a single basic rate, one that is low enough to reach the edges of
the wireless cells.
•
If you need to transmit the multicast data at a certain data rate in order to achieve a certain
throughput, then configure that rate as the highest basic rate. You can also set a lower basic rate for
coverage of non-multicast clients.
throughput, then configure that rate as the highest basic rate. You can also set a lower basic rate for
coverage of non-multicast clients.