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Release Notes for Cisco Aironet Access Points and Bridges for Cisco IOS Release 15.2(2)JA
OL-23990-01
Important Notes
Point-to-point and Point-to-Multipoint bridging support for 802.11n platforms
The point-to-point and point-to-multipoint bridging is supported on the Cisco Aironet 1040, 1130, 1140,
1240, 1250 and 1260 Series Access Points (802.11n platforms). The 5-GHz bands support 20- and
40-MHz channel widths, and the 2.4-GHz bands support only a 20-MHz channel width.
The following items are supported for AP1040 and AP1260 bridging:
• MIMO, short-range bridging (on campus or inter-building bridge deployments), with dipole and
MIMO antennas (line of sight and short range) under 1 Km.
• 20-MHz and 40-MHz 802.11n support.
• Workgroup bridge (WGB) short-range support.
• SISO (single-in, single-out), MCS 0-7 and legacy bridge rates (802.11 a/b/g and 802.11n) using one
outdoor antenna.
Note This is only supported using short range links and is not a replacement for the AP-1240/1300/1400 or
other Bridge products.
The following items are not supported for AP1040 and AP1260 bridging:
• The distance CLI command: long-range links over 1 Km currently are not supported; therefore the
distance command is not supported.
• Outdoor MIMO bridging using external antennas has not been fully tested and is not fully supported
with this release.
Access Points are Transmitting Multicast and Management Frames
Access points running recent Cisco IOS versions transmit multicast and management frames at the
highest configured basic rate, which can cause 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.
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.
Depending on your specific requirements, these options are available:
• If you need to transmit multicast data with the greatest reliability and if there is no need for great
multicast bandwidth, configure a single basic rate that is low enough to reach the edges of the
wireless cells.
• If you need to transmit multicast data at a certain data rate in order to achieve a certain throughput,
configure that rate as the highest basic rate. You can also set a lower basic rate for coverage of
non-multicast clients.
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