Configuring Backhaul Channel Deselection (Gui) - Cisco Mesh Access Points Deployment Manual

Backhaul Channel Deselection on Serial Backhaul Access Point
The backhaul channel deselection feature helps you to restrict the set of channels available to be assigned for
the serial backhaul MAPs and RAPs. Because 1524SB MAP channels are automatically assigned, this feature
helps in regulating the set of channels that get assigned to mesh access points. For example, if you do not
want channel 165 to get assigned to any of the 1524SB mesh access points, you need to remove channel 165
from the DCA list and enable this feature.
When you remove certain channels from the DCA list and enable the mesh backhaul dca-channel command,
those channels will not be assigned to any serial backhaul access points in any scenario. Even if a radar is
detected on all channels within the DCA list channels, the radio will be shut down rather than moved to
channels outside it. A trap message is sent to the Prime Infrastructure, and the message is displayed showing
that the radio has been shut down because of DFS. You will not be able to assign channels to the serial backhaul
RAP outside of the DCA list with the config mesh backhaul dca-channels enable command enabled.
However, this is not case for the APs with one 5-GHz radio such as 1552, 1522, and 1524PS APs. For these
APs, you can assign any channel outside of the DCA list for a RAP, and the controller/AP can also select a
channel outside of the DCA list if no radar-free channel is available from the list.
This feature is best suited in an interoperability scenario with indoor mesh access points or workgroup bridges
that support a channel set that is different from outdoor access points. For example, channel 165 is supported
by outdoor access points but not by indoor access points in the -A domain. By enabling the backhaul channel
deselection feature, you can restrict the channel assignment to only those channels that are common to both
indoor and outdoor access points.
Channel deselection is applicable to 7.0 and later releases.
Note
In some scenarios, there may be two linear tracks or roads for mobility side by side. Because channel
selection of MAPs happens automatically, there can be a hop at a channel, which is not available on the
autonomous side, or the channel has to be skipped when the same or adjacent channel is selected in a
neighborhood access point that belongs to a different linear chain.

Configuring Backhaul Channel Deselection (GUI)

Step 1
Choose Controller > Wireless > 802.11a/n > RRM > DCA
The Dynamic Channel Assignment Algorithm page appears.
Step 2 Select one or more channels to include in the DCA list.
The channels included in the DCA list will not be assigned to the access points associated to this controller during
automatic channel assignment.
Step 3
Choose Wireless > Mesh
The Mesh page appears.
Step 4 Select the Mesh DCA Channels check box to enable the backhaul channel deselection using the DCA list. This option
is applicable for serial backhaul access points.
Step 5 After you enable the backhaul deselection option, choose Wireless > Access Points > Radios > 802.11a/n to configure
the channel for the RAP downlink radio.
Step 6
From the list of access points, click on the Antenna drop-down list for a RAP and choose Configure.
The Configure page appears.
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