Initially (in the first 30-60 minutes) there will be more frequent channel changes as ChannelFly
learns the environment. However, once an AP has learned about the environment and which
channels are most likely to offer the best throughput potential, channel changes will occur less
frequently unless a large measured drop in throughput occurs.
ChannelFly can react to large measured drops in throughput capacity in as little as 15 seconds,
while smaller drops in capacity may take longer to react to.
Disadvantages of ChannelFly
Compared to Background Scanning, ChannelFly takes considerably longer for the network to
settle down. If you will be adding and removing APs to your network frequently, Background
Scanning may be preferable. Additionally, if you have clients that do not support the 802.11h
standard, ChannelFly may cause significant connectivity issues during the initial capacity
assessment stage.
You can enable/disable ChannelFly per band. If you have 2.4 GHz clients that do not support
802.11h, Ruckus recommends disabling ChannelFly for 2.4 GHz but leaving it enabled for the
5 GHz band.
Background Scanning
Using Background Scanning, SmartZone controllers regularly samples the activity in all Access
Points to assess RF usage, to detect rogue APs and to determine which APs are near each
other for mesh optimization. These scans sample one channel at a time in each AP so as not
to interfere with network use. This information is then applied in AP Monitoring and other controller
monitoring features. You can, if you prefer, customize the automatic scanning of RF activity,
deactivate it if you feel it's not helpful, or adjust the frequency, if you want scans at greater or
fewer intervals.
NOTE: Background Scanning must be enabled for SmartZone controllers to detect rogue APs
on the network.
VLAN Pooling
When Wi-Fi is deployed in a high density environment (such as a stadium) or on a university
campus to provide access for students, the number of IP addresses required for client devices
can easily run into several thousands.
Allocating a single large subnet results in a high probability of degraded performance due to
factors like broadcast/multicast traffic.
To address this problem, VLAN pooling provides a method by which administrators can deploy
pools of multiple VLANs from which clients are assigned, thereby automatically segmenting large
groups of clients into smaller subgroups, even when connected to the same SSID.
As the client device joins the Wi-Fi network, the VLAN is assigned based on a hash of the client’s
MAC address (by default).
SmartCell Gateway 200/Virtual SmartZone High-Scale for Release 3.4.1 Administrator Guide
41
Managing Ruckus Wireless AP Zones
Working with AP Zones
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