3Com 4007 Implementation Manual page 553

AppleTalk Address Resolution Protocol (AARP) Cache
AARP registers a node's dynamically assigned address on the network, as
follows:
AARP randomly assigns an address.
To determine whether another node is already using the address, the
system broadcasts AARP probe packets containing the address.
If the system receives no reply, the address becomes the node's
address.
If the system receives a reply, it repeats the process until it discovers
an available address.
AARP entries include the following information:
AARP address — AARP address of the node in network.node format
MAC address — MAC layer address of the node
Interface — Interface through which the node can be reached
Age — Number of seconds before the system ages out the
cache entry
If there is no space available in the AARP cache for a new entry, the least
recently used entry is purged to make room for the new entry.
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