Avaya Configuring ATM Services Manuel d'utilisateur Page 55

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Understanding ATM, MPOA, and ATM Router Redundancy Concepts
117374-B Rev. 00
1-29
An ATM LIS can replace an IP LAN. In Figure 1-11, for example, three IP host
systems and an IP router have interfaces to an Ethernet LAN. To communicate
with each other on the LAN, the devices use the MAC addresses that they obtain
using ARP or static routes. For communication beyond the LAN, the devices use
IP addresses.
Figure 1-11. IP Local Area Network
In Figure 1-12, an ATM network replaces the LAN interfaces, creating a LIS. For
communication within the LIS, the devices use ATM addresses obtained using
ATMARP; for communication 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 (router A), using the router’s
ATM address. The router then forwards the message.
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
Router
Host
C
Host
A
Host
B
ATM0035A
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