3Com CoreBuilder 2500 User Manual - page 202
14-6
C
HAPTER
14: A
DMINISTERING
A
PPLE
T
ALK
R
OUTING
Administering the
AARP Cache
Use AARP to map hardware addresses to an AppleTalk protocol address.
AppleTalk uses dynamically assigned 24-bit addresses, unlike the statically
assigned 48-bit addresses that Ethernet uses.
To make the address mapping process easier, AARP uses an Address
Mapping Table (AMT). The AMT maintains the most recently used
addresses. If an address is not in the AMT, AARP sends a request to the
desired protocol address, and the hardware address is added to the table
when the destination node replies.
AARP also 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,
AARP broadcasts AARP probe packets to this address.
■
If there is no reply, the address becomes that node’s address.
■
If there is a reply, AARP repeats this process until an available address
is discovered.
In the Administration Console, you can:
■
Display the AARP/AMT address cache
■
Remove entries from the cache
■
Flush the cache
Displaying the
AARP Cache
Use this command to display the AARP cache for the system to determine
the routes that are configured and whether they are operational.
To display the AARP cache, from the top level of the Administration
Console, enter:
appletalk aarp display
Top-Level Menu
system
ethernet
fddi
atm
bridge
ip
ipx
➧
appletalk
snmp
analyzer
script
logout
interface
route
➧
aarp
zone
forwarding
checksum
ping
statistics
➧
display
remove
flush