Avaya Configuring ATM and MPLS Services Instrukcja Użytkownika Pobierz pdf (Strona 59)

100

101

Understanding ATM, MPOA, ATM Router Redundancy, and OAM

117374-C 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

ATM0035A

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 528 529

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Avaya Configuring ATM and MPLS Services Instrukcja Użytkownika Strona 59

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