Avaya Configuring ATM and MPLS Services Manual do Utilizador descarregar pdf (Página 61)

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Understanding ATM, MPOA, ATM Router Redundancy, and OAM

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ATM Address Resolution

An address resolution protocol defines a mechanism that enables an IP router to

use the IP address of a network device to learn the physical address of that device.

An Ethernet LAN uses ARP as its address resolution scheme. A LIS uses an

address resolution scheme called ATMARP as defined by RFC 1577.

On a LAN, defined as 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.

Each IP interface on the LIS opens a VC to the ATMARP server and registers its

IP address and ATM address (Figure 1-12

on page 1-30). Using this information,

the server builds and maintains a table that maps LIS IP addresses to ATM

addresses.

A router that needs the ATM address of a host on the LIS sends an ATMARP

request to the server. When the server returns a response containing the address,

the router extracts the ATM address of the host from the response and opens an

SVC directly to the host using ATM UNI signaling.

If the server does not have an entry for the requested IP address, it returns a

negative acknowledgment, signifying that the destination is unreachable.

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