Allied Telesis AT-WA7500 - Manual (Page 110)

5 - Configuring the Spanning Tree
110
About
Secondary LANs
and Designated
Bridges
There are two types of secondary LANs: a wireless secondary LAN is
connected to the primary LAN wirelessly via a WAP, and a remote IP
subnet is connected via an IP tunnel.
Table 19 Comparison of Wireless Secondary LANS and Remote IP
Subnets
The access point that is responsible for bridging data between a
secondary LAN and the primary LAN is called the designated bridge. The
designated bridge must be an access point:
‰ on the secondary LAN.
‰ with the Secondary LAN Bridge Priority value set to a non-zero
number.
‰ with at least one radio set to Station mode or that is the endpoint
of an IP tunnel. For more information, see About IP Tunnels on
page 116.
If more than one access point meets these requirements, the access
point with the highest secondary LAN bridge priority is the designated
bridge. If two access points have the same secondary LAN bridge
priority, the access point with the highest Ethernet address becomes the
designated bridge. If the designated bridge goes offline, the remaining
access points negotiate to determine which access point becomes the
new designated bridge.
Wireless Secondary LANs (WAPs) Remote IP Subnets
(IP Tunnels)
Any access point can provide a
wireless link to another access point. Only the root access point can
originate an IP tunnel to
another access point.
A wireless link provides a
transparent bridge for both wired
and wireless devices. An IP tunnel provides a
transparent bridge for wireless
end devices on a remote IP
subnet.