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Appendix C: Glossary
332
Ethernet bridging
When an access point receives wireless traffic and the destination
address is known, it forwards frames to the port with the shortest path to
the destination address. When the access point has not learned the
direction of the shortest path for the destination address, it forwards
frames based on flooding settings to try to locate the destination address.
flooding
A frame is flooded when the destination location is unknown. The
destination location of a multicast frame is never known. Unicast and
multicast flooding parameters determine how a flooded frame is
forwarded.
hello period
A time increment (usually 1, 2, or 3 seconds) that determines how often
the access point sends out a type of multicast frame so that it can
dynamically discover and test connections to other devices in the network.
Once this information is learned, the access point and routers can
exchange routing information.
home IP subnet
Also called the root IP subnet and primary LAN. The IP subnet that
contains the root access point. If wireless end devices need to roam
between IP subnets, each end device needs to have an IP address from
the home IP subnet.
IAPP (Inter Access Point Protocol)
Access points use this protocol to communicate with each other. For
example, when a wireless end device roams to a new access point, the
new access point informs the old access points via the root access point
that any traffic for the end device needs to be routed to the new access
point.
This protocol also allows 802.1x-ready devices to roam seamlessly
through the network without having to reauthenticate after each roam.
IAPP distributes security credentials throughout the network. When an
end device roams from one access point to another, its credentials are
also transferred.
Secure IAPP prevents unauthorized Allied Telesyn access products from
joining the spanning tree and it encrypts IAPP frames. If you enable
secure IAPP, access points will use SWAP to create secure wireless hops
when communicating with each other.