Allied Telesis AT-WL2411 - Manual (Page 77)

AT-WL2411 Installation and User’s Guide
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For more information, see “About Secondary LANs and
Designated Bridges” later in this section.
Secondary LAN Flooding
When an access point is the designated bridge in a secondary
LAN, this parameter specifies the types of frames it passes from
the primary LAN to the secondary LAN.
Disabled
No flooding occurs unless the root access point (in the
Global Flooding screen) enables the Multicast or Unicast
Outbound to Secondary LANs parameter.
Enabled
Multicast and unicast flooding occurs unless the root
access point (in the Global Flooding screen) disables
multicast or unicast flooding.
Multicast
Multicast flooding occurs unless the root access point (in
the Global Flooding screen) disables multicast flooding.
Unicast
Unicast flooding occurs unless the root access point (in the
Global Flooding screen) disables unicast flooding.
3. Click Submit Changes to save your changes. To activate your changes,
click the Save/Discard Changes link in the menu bar and then click
Save Changes and Reboot. For help, see Saving Your Configuration
Changes on page 46.
About the Root
Access Point
The root access point is always on the primary LAN and initiates the
spanning tree. The root coordinates the network and distributes global
system parameters to other access points. The root is elected from a
group of access points that are designated as root candidates (access
points that are powered on, active, and do not have a root priority of 0).
The access point with the highest root priority is the root.
The election process also occurs in the event of a root access point
failure. Besides the root, you should have two or three access points with
a non-zero root priority. If two access points have the same root priority,
the access point with the highest Ethernet address becomes the root.
You should configure your network with overlapping coverage so that
the network can automatically recover from any single point of failure.
After the root access point is elected, it transmits hello messages on all
enabled ports. The spanning tree forms as other access points receive
hello messages and attach to the network on the optimal path to the
root. A non-root access point also transmits hello messages after it is