Monitoring Dfs; Frequency Planning - Cisco Mesh Access Points Deployment Manual

Troubleshooting
Time elapsed since radar last detected: 0 day(s), 7 hour(s), 6 minute(s), 51 second(s).
The RAP should be run through the channels to determine whether there is active radar on each of the
channels.
ap1520-rap #
Radar detected on channel 132, channel becomes unusable (Time Elapsed: 0 day(s), 7
hour(s), 7 minute(s), 11 second(s)).
Channel is set to 100 (Time Elapsed: 0 day(s), 7 hour(s), 7 minute(s), 11 second(s)).
Radar detected on channel 116, channel becomes unusable (Time Elapsed: 0 day(s), 7
hour(s), 6 minute(s), 42 second(s)).
Channel is set to 64 (Time Elapsed: 0 day(s), 7 hour(s), 6 minute(s), 42 second(s)).
Channel 132 becomes usable (Time Elapsed: 0 day(s), 6 hour(s), 37 minute(s), 10
second(s)).
Channel 116 becomes usable (Time Elapsed: 0 day(s), 6 hour(s), 36 minute(s), 42
second(s)).

Monitoring DFS

The DFS history should be run every morning or more frequently to detect the radar. This information does
not get erased and is stored on the mesh access point flash. Therefore, you only need to match the times.
ap1520-rap #
Information similar to the following appears:
interface Dot11Radio1
Radio Hammer 5, Base Address 001c.0e6c.9c00, BBlock version 0.00, Software version 0.05.30
Serial number: FOC11174XCW
Number of supported simultaneous BSSID on Dot11Radio1: 16
Carrier Set: ETSI (OFDM) (EU) (-E)
Uniform Spreading Required: Yes
Current Frequency: 5540 MHz Channel 108 (DFS enabled)
Allowed Frequencies: *5500(100) *5520(104) *5540(108) *5560(112) *5580(116) *560
0(120) *5620(124) *5640(128) *5660(132) *5680(136) *5700(140)
* = May only be selected by Dynamic Frequency Selection (DFS)
Listen Frequencies: 5180(36) 5200(40) 5220(44) 5240(48) 5260(52) 5280(56) 5300(6
0) 5320(64) 5500(100) 5520(104) 5540(108) 5560(112) 5580(116) 5660(132) 5680(136
) 5700(140) 5745(149) 5765(153) 5785(157) 5805(161) 5825(165) 4950(20) 4955(21)
4960(22) 4965(23) 4970(24) 4975(25) 4980(26)
An asterisk indicates that this channel has DFS enabled.
Note

Frequency Planning

Use alternate adjacent channels in adjacent sectors. If you have two RAPs deployed at the same location, you
must leave one channel in between.
Weather radars operate within the 5600- to 5650-MHz band, which means that channels 124 and 128 might
be affected, but also channels 120 and 132 might suffer from weather radar activity.
If the mesh access point does detect radar, the controller and the mesh access point both will retain the channel
as the configured channel. The controller retains it in volatile memory associated with the mesh access point,
and the mesh access point has it stored in its flash as configuration. After the 30 minute quiet period, the
controller returns the mesh access point to the static value, regardless of whether the mesh access point has
OL-27593-01
show mesh dfs channel 132
show controller dot11Radio 1
Cisco Mesh Access Points, Design and Deployment Guide, Release 7.3
Dynamic Frequency Selection
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