
Configuring ATM Services
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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.
Configuring an ATM Service Record for ATMARP
When configuring a service record to act as an ATMARP client or server:
• Define a Classical IP service record
-- Specify SVC as the virtual circuit type for the service record. All network
devices on a LIS must connect over SVCs.
-- Specify LLC/SNAP or NULL as the encapsulation type for the service
record. RFC 1577 defines LLC/SNAP as the encapsulation type for
ATMARP.
• Add IP and IP routing protocols to the circuit.
• Configure ATMARP to run on the router as a client or a server.
Note: For more information on how to create an SVC service record to run
Classical IP, refer to Chapter 1.
Note: For full compatibility with RFC 1577, you may have to specify a
maximum transmission unit (MTU) size of 9188 bytes. Refer to Configuring
Line Services for additional information about setting the MTU size.
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