Intermec MobileLAN access WA21 System Manual page 274

Glossary
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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 Intermec 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 MobileLAN 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.
IGMP (Internet Group Management Protocol)
A standard protocol that lets you originate multiple IP tunnels using one
IP multicast address. IGMP allows IP multicast frames to be routed to
remote IP subnets that have hosts participating in the multicast group. By
enabling IGMP, access points can act as IP hosts and participate in an IP
multicast group.
inbound frames
Frames moving toward the primary LAN.
IP router
A software and hardware connection between two or more subnetworks
that permits traffic to be routed from one network to another on the basis
of the intended destinations.
IP subnet
A single member of the collection of hardware networks that comprise an
IP network. Host addresses on a given subnet share an IP network number
with hosts on all other subnets of the IP network. The local address is
divided into subnet-number and host-number fields to indicate which
subnet a host is on.
MobileLAN access System Manual