Avaya Configuring ATM Services Manual de usuario Pagina 247

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Configuring Classical IP over ATM
C-3
Figure C-2. IP Logical IP Subnet
ATM Address Resolution
An address resolution protocol (ARP) defines a mechanism that enables an IP
router to use the IP address of a network device to learn the device’s physical
address. The address resolution scheme used on an Ethernet LAN is called ARP.
The address resolution scheme defined by RFC 1577 for use in a LIS is called
ATMARP.
On a LAN, which is a broadcast medium, a router obtains the physical address of
a network device by broadcasting an ARP request. In a LIS, which uses a
nonbroadcast ATM medium, a router sends an ATMARP request to an ATMARP
server.
In Figure C-2, for example, each IP interface on the LIS opens a VC to the
ATMARP server and registers its IP address and ATM address. The server uses
this information to build and maintain a table that maps LIS IP addresses to ATM
addresses.
Host
B
Host
A
Router
Router
A
B
Host
C
ATM Network
ATMARP client
ATMARP server
SVC supporting ATM LIS
Key
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