User Manual

111
UniFi Controller User Guide
Ubiquiti Networks, Inc.
Chapter 12: UniFi Access Point Details
- Preferred DNS Enter the IP address of the primary
DNS server.
- Alternate DNS Enter the IP address of the secondary
DNS server.
- DNS Suffix Enter the Fully Qualified Domain Name
(FQDN) without the hostname.
• Queue Changes Click Queue Changes to line up the
changes to take effect. This allows you to make multiple
changes to the device and then apply them all at once
so that the device doesn’t have to re-provision over and
over again when you change different sections of the
configuration. Each section with pending changes is
highlighted by an ellipsis.
When you are done with your changes, click Apply
Changes at the bottom of the screen. (You can
cancel the changes of any section by clicking X of the
appropriate section.)
• Cancel Click Cancel to discard changes.
• Pending Changes If you want queue changes for
multiple devices and then apply them later, the Pending
Changes option appears in the Properties panel. Click
to display the devices.
- Apply Click
APPLY
to save changes.
- Discard Click
DISCARD
to cancel changes.
Band Steering
2.4 GHz networks are typically more congested due to
support of legacy clients and multiple sources of 2.4GHz
interference, including Bluetooth devices. Band steering
can help distribute the load on 2.4 GHz and 5GHz
networks by steering dual-band clients to the 5 GHz band
when appropriate.
Some dual-band clients are band-steering unfriendly for
various reasons and are marked as such by the AP. Such
clients are not steered to any band even when conditions
would justify it.
Note: Only the UAP-PRO, UAP-AC-LITE, UAP-AC-LR,
UAP-AC-PRO, and UAP-AC-EDU models support
band steering.
If enabled, the UniFi band steering policy takes two criteria
into account:
• channel utilization metrics
• signal quality measurements, including RSSI
The AP steers the client to the optimal band during
association (not after association). If both bands or neither
band is overloaded, the AP does not perform band
steering; instead, the client chooses a band.
If the 2.4 GHz band is overloaded, and the RSSI of the
client is above the threshold for association on the 5 GHz
band, then the AP will steer the client to the 5 GHz band
by withholding probe responses.
If the client still attempts to associate on the 2.4 GHz band,
the AP will send auth failure frames in response to auth
requests from the client.
If the 5 GHz band is overloaded and the 2.4 GHz band is
not, then clients are steered to the 2.4 GHz band (RSSI is
not a factor). The RSSI thresholds are 30 dBm or better for
the 5GHz band. For example, if the 2.4 GHz network has
low utilization, then the Steer to 5G option does not steer
all clients to 5 GHz.
All APs must use the same SSID for the 2.4 GHz and 5 GHz
bands. For example, if you have multiple WLANs in your
default WLAN group, you cannot override the 5 GHz SSID
name in one of the WLANs and still use band steering on
the other two WLANs. All APs must use band steering – or
none of them do.
Prefer 5G Select this option to steer clients to the 5GHz
band at a lower channel utilization threshold than the
Balanced option. The threshold is not a single value;
instead it is a function of two values: the 2.4 GHz channel
utilization and 5 GHz channel utilization.
Balanced (Not available for the UAP-PRO.) Select this
option to steer clients to the 5 GHz band channel at a
higher channel utilization threshold than the Steer to 5G
option.
Off Keep the default, Off, if you do not want to use band
steering.
Queue Changes Click Queue Changes to line up the
changes to take effect. This allows you to make multiple
changes to the device and then apply them all at once
so that the device doesn’t have to re-provision over and
over again when you change different sections of the
configuration. Each section with pending changes is
highlighted by an ellipsis.
When you are done with your changes, click Apply
Changes at the bottom of the screen. (You can cancel the
changes of any section by clicking X of the appropriate
section.)