Cisco Cisco Aironet 1310 Access Point Bridge Notas de publicación
9
Release Notes for Cisco Aironet Access Points and Bridges for Cisco IOS Release 12.4(21a)JY
OL-20668-02
Important Notes
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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 radar
is detected. This is an expected behavior and you should not remove this file.
The file is based on the 802.11a radio serial number and contains the channel numbers on which the radar
is detected. This is an expected behavior and you should not remove this file.
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:
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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.
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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.
LWAPP to Autonomous Conversion Requires Two Reboots
When you convert an 1142 access point from LWAPP mode to autonomous mode, you might need to
reboot the unit twice to complete the conversion.
reboot the unit twice to complete the conversion.