
Configuring ATM Services
C-2
Figure C-1. IP Local Area Network
In Figure C-2, an ATM network replaces the LAN interfaces, creating a LIS. For
communications within the LIS, the devices use their ATM addresses obtained via
ATMARP; for communications beyond the LIS, the devices use IP addresses.
For example, to send a message to Host B, Host A uses Host B’s ATM address. To
send a message to a host beyond the LIS, Host A uses an IP address to identify the
remote host and sends the message to the local router, using the router’s ATM
address. The router forwards the message.
Host
B
Host
C
Host
A
Router
140.250.200.0
140.250.200.1
00 00 A2 00 00 01
140.250.200.2
00 00 A2 00 10 20
140.250.200.3
00 00 A2 00 10 30
140.250.200.4
00 00 A2 00 10 40
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